Performance improvement of microstructured fluid separator utilizing the Soret effect
T.Saiki; S.Watanabe; S.Matsumoto; N.Ono, Japan Society of Mechanical Engineers
Proc. The 31st International Symposium on Transport Phenomena (ISTP31, online), 2022年01月01日, ［査読有り］

Separation of a binary gas mixture by thermal diffusion in a two-dimensional cascade of many small cavities
Takumi Saiki; Naoki Ono; Sohei Matsumoto; Shinya Watanabe, ラスト(シニア)オーサー, A new method for separating a binary gas mixture, such as hydrogen and carbon dioxide, is proposed and investigated numerically and experimentally. As a pressure driven flow of the mixture goes through a two-dimensional Burgers cascade, the components are separated due to thermal diffusion and the amplifying effect of the cascade. Unlike traditional cascades in isotope separation, active elements like pumps are absent. The device is made thin enough so that the flow and the concentration distribution reaches an equilibrium within each cell. We have observed separation of up to about 9% in hydrogen concentration in our prototype array consisting of over 19,000 cavities placed under a 160-degree temperature difference., Elsevier
International Journal of Heat & Mass Transfer, 2020年12月, ［査読有り］

Burgers equation with no-flux boundary conditions and its application for complete fluid separation
Shinya Watanabe; Sohei Matsumoto; Tomohiro Higurashi; Naoki Ono, Burgers equation in a one-dimensional bounded domain with no-flux boundary conditions at both ends is proven to be exactly solvable. Cole-Hopf transformation converts not only the governing equation to the heat equation with an extra damping but also the nonlinear mixed boundary conditions to Dirichlet boundary conditions. The average of the solution (v) over bar is conserved. Consequently, from an arbitrary initial condition, solutions converge to the equilibrium solution which is unique for the given (v) over bar. The problem arises naturally as a continuum limit of a network of certain micro-devices. Each micro-device imperfectly separates a target fluid component from a mixture of more than one component, and its input-output concentration relationships are modeled by a pair of quadratic maps. The solvability of the initial boundary value problem is used to demonstrate that such a network acts as an ideal macro-separator, separating out the target component almost completely. Another network is also proposed which leads to a modified Burgers equation with a nonlinear diffusion coefficient. (C) 2016 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
PHYSICA D-NONLINEAR PHENOMENA, 2016年09月, ［査読有り］

高性能流体分離に向けた大規模ネットワーク構造を有するマイクロ流体デバイス
松本 壮平、渡邊 辰矢、日暮 智博、小野 直樹, A micro fluidic device to realize the new fluid separation method, in which both high concentration and high yield can be achieved by constructing a network of numerous limited-performance separator elements, was designed and fabricated for the purpose of proof of concept. A hexagonal separator unit driven by potential gradient was proposed, enabling simultaneous fabrication of the large number of separator units and their connection required to obtain the desired concentration profile. A prototype device consisting of 36×360 separator units was fabricated by MEMS technology with silicon and glass substrates. A thermophoretic separation experiment using fluorescent polymer beads/water dispersion was successfully performed by the developed device., 日本機械学会
第 7 回マイクロ・ナノ工学シンポジウム講演論文集, 2015年10月29日

Almost Complete Separation of a Fluid Component from a Mixture Using Burgers Networks of Microseparators
Shinya Watanabe; Sohei Matsumoto; Tomohiro Higurashi; Yuya Yoshikawa; Naoki Ono, Two ways of networking microseparators to almost completely separate, for example, hydrogen from a mixture are proposed. Each separator has two outlets for slightly higher and lower concentrations, whose difference is modeled by a quadratic map of the average concentration at its inlet. In the continuum, the networks are governed by the Burgers equation or its variant with no-flux boundary conditions. The initial boundary value problem is exactly solvable. A family of equilibria are global attractors. The target component is shown to be extracted from one side of a stationary shock. Microdevices for testing the idea are also proposed., PHYSICAL SOC JAPAN
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2015年04月, ［査読有り］

A constrained variational model for radial symmetry breaking
Shinya Watanabe, 筆頭著者, A simple constrained minimization problem with an integral constraint describes a symmetry breaking of a circular front around a point source. As a single control parameter, the total flux φ from the source, is varied, apparently polygonal solutions with an arbitrary number of corners m are shown to bifurcate from the circular solution. Our asymptotic analysis shows that the branches with m ≥ 3 bifurcate supercritically at φ = π(m² + 2) and continue as φ → ∞ whereas those with m = 1 or 2 bifurcate subcritically and are terminated at φ = 3π and 4π, respectively. The second variation can be evaluated directly for the circular state which is proven to be the minimizing solution only up to φ = 3π., Department of Mathematics, Faculty of Science, Ibaraki University
Mathematical Journal of Ibaraki University, 2013年10月01日, ［査読有り］

Model for polygonal hydraulic jumps
Erik A. Martens; Shinya Watanabe; Tomas Bohr, We propose a phenomenological model for the polygonal hydraulic jumps discovered by Ellegaard and co-workers [Nature (London) 392, 767 (1998); Nonlinearity 12, 1 (1999); Physica B 228, 1 (1996)], based on the known flow structure for the type-II hydraulic jumps with a "roller" (separation eddy) near the free surface in the jump region. The model consists of mass conservation and radial force balance between hydrostatic pressure and viscous stresses on the roller surface. In addition, we consider the azimuthal force balance, primarily between pressure and viscosity, but also including nonhydrostatic pressure contributions from surface tension in light of recent observations by Bush and co-workers [J. Fluid Mech. 558, 33 (2006); Phys. Fluids 16, S4 (2004)]. The model can be analyzed by linearization around the circular state, resulting in a parameter relationship for nearly circular polygonal states. A truncated but fully nonlinear version of the model can be solved analytically. This simpler model gives rise to polygonal shapes that are very similar to those observed in experiments, even though surface tension is neglected, and the condition for the existence of a polygon with N corners depends only on a single dimensionless number phi. Finally, we include time-dependent terms in the model and study linear stability of the circular state. Instability occurs for sufficiently small Bond number and the most unstable wavelength is expected to be roughly proportional to the width of the roller as in the Rayleigh-Plateau instability., AMER PHYSICAL SOC
PHYSICAL REVIEW E, 2012年03月, ［査読有り］

Study and Development of a Mini-Tube Gas Separator Utilizing the Soret Effect
Shunsuke Kuwatani; Shinya Watanabe; Naoki Ono, The Soret effect is a phenomenon in which a temperature gradient gives rise to a concentration gradient. In this study, we attempted a simple technique for the separation of hydrogen from a gas mixture by utilizing the Soret effect. A gas mixture of hydrogen and carbon dioxide was introduced into a metal mini tube in which a temperature gradient was established in the direction normal to the flow. The experiment demonstrated that hydrogen was actually separated from the gas mixture, although the separation was very small with the present apparatus. From results of the experiments and computational fluid dynamics (CFD) analysis, we believe that the layer of high hydrogen concentration that moved toward the heating wall was very thin. It would be necessary to extract the high concentration of hydrogen flowing near the wall to increase the separation efficiency., JAPAN SOC MECHANICAL ENGINEERS
JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY, 2012年, ［査読有り］

A simplified model for flows with eddies in symmetrically expanding channels
Shinya Watanabe; Vakhtang Putkaradze, 責任著者, We derive a simplified model for two-dimensional (2D) channel flows with recirculated regions at moderate Reynolds numbers based on an extension of the boundary layer (BL) theory and averaging across the channel. The model reproduces symmetry-breaking bifurcations and resulting flow structures accurately. Analytical estimates for the decay rates toward the parabolic profile before and after a sudden change in the walls agree well with the full numerical simulations. A seemingly chaotic steady flow is also discovered in a channel with periodic expansions and contractions. (C) 2007 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
PHYSICS LETTERS A, 2007年10月, ［査読有り］

Integral methods for shallow free-surface flows with separation
S Watanabe; Putkaradze, V; T Bohr, 筆頭著者, We study laminar thin film flows with large distortions of the free surface, using the method of averaging across the flow. Two specific problems are studied: the circular hydraulic jump and the flow down an inclined plane. For the circular hydraulic jump our method is able to handle an internal eddy and separated flow. Assuming a variable radial velocity profile as in Karman-Pohlhausen's method, we obtain a system of two ordinary differential equations for stationary states that can smoothly go through the jump. Solutions of the system are in good agreement with experiments. For the flow down an inclined plane we take a similar approach and derive a simple model in which the velocity profile is not restricted to a parabolic or self-similar form. Two types of solutions with large surface distortions are found: solitary, kink-like propagating fronts, obtained when the flow rate is suddenly changed, and stationary jumps, obtained, for instance, behind a sluice gate. We then include time dependence in the model to study the stability of these waves. This allows us to distinguish between sub- and supercritical flows by calculating dispersion relations for wavelengths of the order of the width of the layer., CAMBRIDGE UNIV PRESS
JOURNAL OF FLUID MECHANICS, 2003年04月, ［査読有り］

Cover illustration: Polygonal hydraulic jumps
Clive Ellegard; Adam E.Hansen; Anders Haning; Kim Hansen; Adam Marcussen; Tomas Bohr; Jonas L.Hansen; Shinya Watanabe, 'cover illustration' of the year, IOP PUBLISHING LTD
Nonlinearity, 1999年, ［査読有り］

Dynamics of kinks and vortices in Josephson-junction arrays
Herre S.J. van; der Zant; Shinya Watanabe, 責任著者
in ``Pattern Formation in Continuous and Coupled Systems'' (eds. M.Golubitsky, D.Luss, \& S.H.Strogatz, Springer), 1999年, ［査読有り］

Circuit models for arrays of Josephson oscillators with loads
Enrique Trias; Terry P. Orlando; Amy E. Duwel; Shinya Watanabe, Parallel arrays of underdamped Josephson junctions are interesting due to their ability to produce coherent radiation. For a broad range of array parameters, we find that these arrays have solutions which can be represented as traveling waves with a small number of harmonics. We develop equivalent circuits for the DC and AC response using a harmonic balance technique. The reflection and transmission properties at the boundaries are studied by adding a passive terminating load to the array. We also develop a load criteria for optimal output power to both passive and non-linear loads., IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
IEEE Transactions on Applied Superconductivity, 1999年, ［査読有り］

Row-switched states in two-dimensional underdamped Josephson-junction arrays
Mauricio Barahona; Shinya Watanabe, When magnetic flux moves across layered or granular superconductor structures, the passage of vortices can take place along channels which develop finite voltage, while the rest of the material remains in the zero-voltage state. We study analytically an example of such mixed dynamics: the row-switched (RS) states in underdamped two-dimensional Josephson arrays, driven by a uniform de current under external magnetic field but neglecting self-fields. The governing equations are cast into a compact differential-algebraic system which describes the dynamics of an assembly of Josephson oscillators coupled through the mesh current. We carry out a formal perturbation expansion, and obtain the de and ac spatial distributions of the junction phases and induced circulating currents. We also estimate the interval of the driving current in which a given RS state is stable. All these analytical predictions compare well with our numerics. We then combine these results to deduce the parameter region (in the damping coefficient vs magnetic-field plane) where RS states cannot exist. [S0163-1829(98)11517-5]., AMER PHYSICAL SOC
Physical Review B, 1998年, ［査読有り］

Creating corners in kitchen sinks
Clive Ellegaard; Adam E.Hansen; Anders Haaning; Kim Hansen; Anders Marcussen; Tomas Bohr; Jonas L.Hansen; Shinya Watanabe, MACMILLAN MAGAZINES LTD
Nature, 1998年, ［査読有り］

Dynamics of one-dimensional Josephson-junction arrays
Herre S.J. van der Zant; Mauricio Barahona; Amy E. Duwel; Enrique Trias; Terry P. Orlando; Shinya Watanabe; Steven H. Strogatz, We study the dynamics of one-dimensional arrays of Josephson junctions connected in parallel by superconducting wires. These arrays are model systems for the discrete, damped sine-Gordon equation and excellent agreement between theory and experiment is obtained. The influence of boundary conditions and the coupling between two discrete sine-Gordon systems have also been investigated. In Josephson ladders, superconducting islands are connected to other islands by three Josephson junctions. The dynamics of Josephson ladders is more complicated than that of the purely 1D sine-Gordon systems. (C) 1998 Elsevier Science B.V., ELSEVIER SCIENCE BV
Physica D, 1998年, ［査読有り］

Separation and pattern formation in hydraulic jumps
Tomas Bohr; Clive Ellegaard; Adam E.Hansen; Kim Hansen; Anders Haaning; Vakhtang Putkaradze; Shinya Watanabe, We present theory and experiments on the circular hydraulic jump in the stationary regime. The theory can handle the situation in which the fluid flows over an edge far away from the jump. In the experiments the external height is controlled, and a series of transitions in the flow structure appears. First the steepening of the jump causes a transition akin to the breaking of a wave, and subsequently a series of shapes appear, which break the azimuthal symmetry. (C) 1998 Elsevier Science B.V. All rights reserved., ELSEVIER SCIENCE BV
Physica A, 1998年, ［査読有り］

Averaging theory for the structure of hydraulic jumps and separation in laminar free surface flows
Tomas Bohr; Vakhtang Putkaradze; Shinya Watanabe, We present a simple viscous theory of free-surface flows in boundary layers, which can accommodate regions of separated flow. In particular, this yields the structure of stationary hydraulic jumps, both in their circular and linear versions, as well as structures moving with a constant speed. Finally, we show how the fundamental hydraulic concepts of subcritical and supercritical flow, originating from inviscid theory, emerge at intermediate length scales in our model., AMERICAN PHYSICAL SOC
Physical Review Letters, 1997年, ［査読有り］

Stability of periodic solutions in series arrays of Josephson junctions with internal capacitance
Shinya Watanabe; James W. Swift, 筆頭著者, A mystery surrounds the stability properties of the splay-phase periodic solutions to a series array of N Josephson junction oscillators. Contrary to what one would expect from dynamical systems theory, the splay state appears to be neutrally stable for a wide range of system parameters. It has been explained why the splay state must be neutrally stable when the Stewart-McCumber parameter beta (a measure of the junction internal capacitance) is zero. In this paper we complete the explanation of the apparent neutral stability; we show that the splay state is typically hyperbolic - either asymptotically stable or unstable - when beta > 0. We conclude that there is only a single unit Floquet multiplier, based on accurate and systematic computations of the Floquet multipliers for beta ranging from 0 to 10. However, N - 2 multipliers are extremely close to 1 for beta larger than about 1. In addition, two more Floquet multipliers approach 1 as beta becomes large. We visualize the global dynamics responsible for these nearly degenerate multipliers, and then estimate them accurately by a multiple time-scale analysis. For N = 4 junctions the analysis also predicts that the system converges toward either the in-phase state, the splay state, or two clusters of two oscillators, depending on the parameters., SPRINGER VERLAG
Journal of Nonlinear Science, 1997年, ［査読有り］

Discreteness-induced resonances and ac voltage amplitudes in long one-dimensional Josephson junctions
Amy E.Duwel; Shinya Watanabe; Enrique Trias; Terry P. Orlando; Herre S.J.van der Zant; Steven H.Strogatz, New resonance steps are found in the experimental current-voltage characteristics of long, discrete, one-dimensional Josephson junction arrays with open boundaries and in an external magnetic field. The junctions are underdamped, connected in parallel, and de biased. Numerical simulations based on the discrete sine-Gordon model are carried out, and show that the solutions on the steps are periodic trains of fluxons, phase locked by a finite amplitude radiation. Power spectra of the voltages consist of a small number of harmonic peaks, which may be exploited for possible oscillator applications. The steps form a family that can be numbered by the harmonic content of the radiation, the first member corresponding to the Eck step. Discreteness of the arrays is shown to be essential for appearance of the higher order steps. We use a multimode extension of the harmonic balance analysis, and estimate the resonance frequencies, the ac voltage amplitudes, and the theoretical limit on the output power on the first two steps. (C) 1997 American Institute of Physics. [S0021-8979(97)00919-5]., AMER INST PHYSICS
Journal of Applied Physics, 1997年

Resonances of dynamical checkerboard states in Josephson arrays with self-inductance
Mauricio Barahona; Enrique Trias; Terry P.Orlando; Amy E. Duwel; Herre S.J. van der Zant; Shinya Watanabe; Steven H. Strogatz, We study the dynamics of fully frustrated, underdamped Josephson arrays. Experiments reveal remarkable similarities among the de current-voltage characteristics of several kinds of square and triangular arrays, where two resonant voltages are observed. Simulations indicate that a dynamical checkerboard solution underlies these similarities. By assuming such a solution, we reduce the governing equations to three coupled pendulum equations, and thereby calculate the voltages of the intrinsic resonances analytically., AMERICAN PHYSICAL SOC
Physical Review B, 1997年, ［査読有り］

A novel phase-locked state in discrete Josephson oscillators
Amy E. Duwel; Terry P. Orlando; Shinya Watanabe; Herre S.J. van der Zant, We have measured a novel phase-locked state in discrete parallel arrays of Josephson junctions which can be used for oscillator applications. Previous Josephson junction oscillators have been based on the Eck step, where a large-amplitude wave of nearly a single harmonic travels through the system. Multirow systems biased on the Eck step could improve the output power, but their in-phase oscillations are difficult to stabilize. A new in-phase state which is very stable has been measured as a step in the de I-V characteritic of one and two row systems. Simulations show that large-amplitude oscillations of two harmonics characterize the state. The rows are phase-locked and in-phase for the higher harmonic. We present an analytic expression for the oscillation frequencies and their magnetic tunability., IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
IEEE Transactions on Applied Superconductivity, 1997年, ［査読有り］

Dynamics of circular arrays of Josephson junctions and the discrete sine-Gordon equation
Shinya Watanabe; Herre S.J. van der Zant; Steven H. Strogatz; Terry P. Orlando, 筆頭著者, We analyze the damped, driven, discrete sine-Gordon equation with periodic boundary conditions and constant forcing. Analytical and numerical results are presented about the existence, stability, and bifurcations of traveling waves in this system. These results are compared with experimental measurements of the current-voltage (I-V) characteristics of a ring of N=8 underdamped Josephson junctions.
We find two types of traveling waves: low-velocity kinks and high-velocity whirling modes. The kinks excite small-amplitude linear waves in their wake. At certain drive strengths, the linear waves phase-lock to the kink, generating resonant steps in the I-V curve. Steps also occur in the high-velocity region, due to parametric instabilities of the whirling mode. We analyze the onset of these instabilities, then numerically study the secondary bifurcations and complex spatiotemporal phenomena that occur past the onset. In all cases, the measured voltage locations of the resonant steps are in good agreement with the predictions., ELSEVIER SCIENCE BV
Physica D, 1996年, ［査読有り］

Resonance splitting in discrete planar arrays of Josephson junctions
Amy E. Duwel; Enrique Trias; Terry P. Orlando; Herre S.J. van der Zant; Shinya Watanabe; Steven H. Strogatz, We have measured and modeled the dynamics of inductively coupled discrete arrays of niobium Josephson junctions. We see splitting of the Eck step in the current-voltage characteristic, Numerical simulations reproduce this splitting and are used to find an approximate solution for the junction phases at resonance. Using the technique of harmonic balance, we find an analytic expression for the resonance frequencies and the voltages that match this splitting. We can also predict the amplitude of these oscillations. The analytical results describe both the experiments and simulations well. (C) 1996 Americnn Institute of Physics., AMER INST PHYSICS
Journal of Applied Physics, 1996年, ［査読有り］

Whirling modes and parametric instabilities in the discrete sine-Gordon equation: experimental tests in Josephson rings
Shinya Watanabe; Steven H. Strogatz; Herre S.J. van der Zant; Terry P. Orlando, 筆頭著者, AMERICAN PHYSICAL SOC
Physical Review Letters, 1995年

Kink propagation in a highly discrete system: observation of phase locking to linear waves
Herre S.J. van der Zant; Terry P. Orlando; Shinya Watanabe; Steven H. Strogatz, AMERICAN PHYSICAL SOC
Physical Review Letters, 1995年, ［査読有り］

Resonant steps in parallel Josephson junction arrays: parametric instabilities of whirling modes
Shinya Watanabe; Steven H. Strogatz; Herre S.J. van der Zant; Terry P. Orlando, 筆頭著者, Circular arrays of underdamped Josephson junctions exhibit a series of resonant steps in the return path of the subgap region in the current-voltage characteristics. We show that the voltage locations of the steps can be predicted by studying the parametric instabilities of whirling periodic solutions, and experimentally verify the prediction in a ring of 8 underdamped junctions. The whirling modes become unstable in certain voltage intervals, and a branch (a resonant step) of more complicated solutions emerges from the endpoint of each interval. We extend the analysis to open-ended arrays and find that for f = 0, the onset of a zero-field step has the same underlying mechanism. For f > 0, combinations of lattice eigenfrequencies are excited., IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
IEEE Transactions on Applied Superconductivity, 1995年, ［査読有り］

Constants of motion for superconducting Josephson arrays
Shinya Watanabe; Steven H. Strogatz, 筆頭著者, We show that series arrays of N identical overdamped Josephson junctions have extremely degenerate dynamics. In particular, we prove that such arrays have N - 3 constants of motion for all N greater-than-or-equal-to 3. The analysis is based on a coordinate transformation that reduces the governing equations to an (N - 3)-parameter family of low-dimensional systems. In the weak-coupling limit, the reduced equations can be analyzed completely. Either all solutions approach the synchronous state or they converge to a continuous family of incoherent oscillations, depending on a certain parameter value. At the transitional value of this parameter, the system becomes completely integrable. Then the phase space is foliated by invariant two-dimensional tori, for any N greater-than-or-equal-to 3. The infinite-N limit of the system is an integro-partial differential equation with rigorously low-dimensional dynamics. It supports solitons in the integrable case, and chaotic waves in the non-integrable case., ELSEVIER SCIENCE BV
Physica D, 1994年, ［査読有り］

Vortices trapped in discrete Josephson rings
Herre S.J. van der Zant; Terry P. Orlando; Shinya Watanabe; Steven H. Strogatz, We report the first measurements of current-voltage (I-V) characteristics of discrete rings of Josephson junctions. As I is increased, resonant steps appear in the I-V curve, due to phase-locking between a propagating, trapped vortex and the linear waves excited in its wake. Unexpectedly, the phase velocity of the linear waves, not the group velocity, is the physically important quantity and mode numbers outside the Brillouin zone are relevant. Our measurements show that away from the resonant steps, a single vortex can move in an environment with very little damping, making the discrete one-dimensional ring a well-defined model system for the study of ballistic and quantum vortex experiments., ELSEVIER SCIENCE BV
Physica B, 1994年

Integrability of a globally coupled oscillator array
Shinya Watanabe; Steven H. Strogatz, 筆頭著者, We show that a dynamical system of N phase oscillators with global cosine coupling is completely integrable. In particular, we prove that the N-dimensional phase space is foliated by invariant two-dimensional tori, for all N greater-than-or-equal-to 3. Explicit expressions are given for the constants of motion, and for the solitary waves that occur in the continuum limit. Our analysis elucidates the origin of the remarkable phase space structure detected in recent numerical studies of globally coupled arrays of Josephson junctions, lasers, and Ginzburg-Landau oscillators., AMERICAN PHYSICAL SOC
Physical Review Letters, 1993年, ［査読有り］

The geometry of nonlinear Schroedinger standing waves: pure power nonlinearities
Paul K. Newton; Shinya Watanabe, A numerical method to study radially symmetric standing wave solutions (with arbitrarily large number of nodes) to the nonlinear Schrodinger equation is described and used to study several new geometric features of these waves. The method is based on numerically locating the basin boundary (separating surface) between two attracting invariant lines in phase space. Each solution trajectory lies on the basin boundary, and is computed by 'squeezing' it between two adjacent asymptotically stable trajectories. Of particular interest is the asymptotic distribution of the eigenvalues and the conserved quantities, which follow power law behavior. Also of interest is the geometry of the basin boundary, which shows that the solution with a prescribed number of zeroes is unique., ELSEVIER SCIENCE BV
Physica D, 1993年, ［査読有り］

マイクロ・ナノ熱工学の進展　　　　　　　　　　　　　　　
小野直樹、松本壮平、渡邊辰矢, 分担執筆
（株）エヌ・ティー・エス, 2021年05月17日, ［査読有り］
9784860437220

オートエンコーダーを用いた螺旋上のデータの学習とその評価　　　　　　　　　　　　　　　
服部 翔太; 渡邊 辰矢
日本応用数理学会2024年度年会, 2024年09月15日

Numerical Study on a Micro-structured Gas Separator utilizing the Soret effect　　　　　　　　　　　　　　　
Takeshi KYODA; Shunsuke NOBE; Sohei MATSUMOTO; Shinya WATANABE; Naoki ONO
SEATUC 2022 (16th South East Asian Technical University Consortium), 2022年02月24日, South East Asian Technical University Consortium
20220223, 20220224

Two-Dimensional Cascades of Near-Identity Maps for Almost Complete Separation of Gas Mixtures　　　　　　　　　　　　　　　
Shinya Watanabe; Sohei Matsumoto; Takumi Sakiki; Takeshi Kyoda; and Naoki Ono
SIAM Conference on Applications of Dynamical Systems, 2021年05月26日, SIAM
20210523, 20210527

PERFORMANCE IMPROVEMENT OF MICROSTRUCTURED FLUID SEPARATOR UTILIZING THE SORET EFFECT
T. Saiki; S. Watanabe; S. Matsumoto; N. Ono
The 31st International Symposium on Transport Phenomena, 2020年10月13日, JSME, HTSJ, VSJ, GMSI
20201013, 20201016

非線形写像の2次元連成系での大域収束性を混合ガス分離へ応用する試み
渡邊辰矢、斎木匠、小野直樹、松本壮平
日本応用数理学会 2020年度 年会, 2020年09月09日, 日本応用数理学会
20200908, 20200910

Two-dimensional cascades of near-identity maps for almost complete separation of gas mixtures
Shinya Watanabe
Dynamics Days Digital 2020 (DDD2020), 2020年08月25日
20200824, 20200827

Performance Improvement of Microstructured Fluid Separator Utilizing the Soret Effect　　　　　　　　　　　　　　　
T. Saiki; T. Otsuka; T. Miyauchi; S. Matsumoto; S. Watanabe; N. Ono
16th Int. Conf. on Flow Dynamics (ICFD2019), 2019年11月07日

Optimization of Micro-structured Gas Separator Utilizing the Soret Effect　　　　　　　　　　　　　　　
K. Matsumoto; N. Takeda; K. Okamoto; S. Matsumoto; S. Watanabe; N. Ono
14th Int. Conf. on Flow Dynamics (ICFD2017), 2017年11月02日

Development and Evaluation of Micro-structured Gas Separator Utilizing the Soret Effect　　　　　　　　　　　　　　　
K. Matsumoto; M. Tsuchiya; S. Ootaki; S. Matsumoto; S. Watanabe; N. Ono
13th Int. Conf. on Flow Dynamics (ICFD2016), 2016年10月11日

Almost complete separation of a fluid component from mixture using the Burgers' networks of micro-separators　　　　　　　　　　　　　　　
Shinya Watanabe; Sohei Matsumoto; Naoki Ono
ICMMA 2015 'Self-Organization Modeling and Analysis', 2015年10月28日, 明治大学先端数理科学インスティテュート

微小素子のBurgersネットワーク化による混合流体のほぼ完全な分離　　　　　　　　　　　　　　　
渡邊 辰矢; 松本 壮平; 小野 直樹
日本応用数理学会2015年 年会, 2015年09月10日, 日本応用数理学会

Almost complete separation of a fluid component from mixture using the Burgers networks of micro-separators　　　　　　　　　　　　　　　
Shinya Watanabe; Sohei Matsumoto; Naoki Ono
ICIAM 2015 (8th International Congress on Industrial and Applied Mathematics), 2015年08月13日, The International Council for Industrial and Applied Mathematics (ICIAM)

微小素子のBurgersネットワーク化による混合流体のほぼ完全な分離　　　　　　　　　　　　　　　
渡邊辰矢
RIMS研究集会『力学系とその諸分野への応用』, 2015年07月01日, 荒井迅先生（北海道大学）、京都大学数理解析研究所

Almost Complete Separation of a Fluid Component from a Mixture Using the Burgers Networks of Micro-separators　　　　　　　　　　　　　　　
Shinya Watanabe; Sohei Matsumoto; Tomohiro Higurashi; Yuya Yoshikawa; Naoki Ono
SIAM Conference on Applications of Dynamical Systems, 2015年05月20日, SIAM

A simplified model for flows with eddies and locking of asymmetric flow patterns in a periodic channel with symmetric walls　　　　　　　　　　　　　　　
渡辺辰矢
力学系理論の応用に関する研究会, 2007年03月10日, 機械工学における力学系理論の応用に関する研究会

A simplified model for flows with eddies and locking of asymmetric flow patterns in a periodic channel with symmetric walls　　　　　　　　　　　　　　　
Shinya Watanabe
International Workshop on Synchronization: Phenomena and Analyses, 2006年10月04日, Aihara Complexity Modelling Project, ERATO, JST

ソーレ効果を用いたガス分離デバイスの微細連続構造による高性能化
基盤研究(C)
芝浦工業大学
2015年04月01日 - 2018年03月31日

振動流中の非一様壁面付近の剥離泡剥脱過程のモデル化
若手研究(B)
茨城大学
2001年 - 2002年

剥離泡構造をもつ非圧縮性流れの分岐とパターン形成
奨励研究(A)
茨城大学
1999年 - 2000年