垂直管内の突沸現象解明に関する研究
松村邦仁; 神永文人; 鈴木政浩; 藤井寛一, Lead
日本原子力学会和文論文誌, 01 Jun. 2014, [Reviewed]
垂直円筒容器内のガイセリングに関する研究
松村邦仁; 神永文人; 鈴木政浩; 藤井寛一, Lead
日本原子力学会和文論文集, 2012, [Reviewed]
地域連携を生かした茨城大学における原子力工学教育の取り組み
松村邦仁; 神永文人; 関東康助; 田中伸厚; 三枝幹夫; 菊池賢治; 車田亮, Lead
工学教育学会, 2012, [Reviewed]
不凍液添加水溶液の飽和プール沸騰熱伝達に関する研究
松村邦仁; 神永文人
日本冷凍空調学会論文集, 2010, [Reviewed]
Study on the Performance of an advanced Water-Cooled Heat Sink Using a Thermosyhon Mechanism for Electronic Devices
F.Kaminaga and K. Matsumura, Lead
Heat Pipe Science and Technology, An International Journal, 2010, [Reviewed]
Nucleate boiling performance of azeotropic binary mixtures in a saturated pool boiling systemK.Matsumura and F. Kaminaga, Lead, Nucleate boiling of binary mixtures is of particular importance in chemical and process industries. The purpose of the present study is to provide experimental data and prediction method for nucleate boiling heat transfer in two types of antifreeze solutions, Propylene-glycol (PG)/water and Ethyleneglycol (EG)/water, under atmospheric pressure. The experiments were performed in a saturated condition. The concentrations of solutions are varied from 10 to 40 wt%. It was found that the heat transfer coefficient gradually decreases as increasing the addition of anti-freeze. An addition of small amount of propylene-glycol and ethylene-glycol to water also decreases the CHF value far below that of pure water. It is concluded that the correlation proposed by Fujita for several binary mixtures can well predict the heat transfer coefficients within almost +/- 5% accuracy for every concentration of mixture solutions., AMER SOC MECHANICAL ENGINEERS
Proceedings of 14th International Heat Transfer Conference, 2010,
[Reviewed] ループ型並列密閉熱サイフォンの伝熱特性に関する研究(熱コンダクタンスによる評価)
高橋章; 神永文人; 松村邦仁
日本機械学会論文集B編, 2008, [Reviewed]
Study on thermal conductance of looped parallel closed thrmosyphon
Akira Takahashi; F. Kaminaga and K. Matsumura
Proceedings of the 2nd International Forum on Heat transfer, 2008, [Reviewed]
Heat transfer performance in a looped parallel thermosyphon
F. Kaminaga; K. Matsumura and Akira Takahashi)
Proceedings of the 14 th International Heat pipe Conference, 2007, [Reviewed]
Saturated Flow Boiling of Water in a Vertical Small Diameter TubeB. Sumith; F. Kaminaga and K. Matsumura, The characteristics of flow boiling heat transfer of water in a vertical tube with a 1.45 mm diameter, which is less than the Laplace constant, are experimentally studied under atmospheric pressure and forced flow condition. Local heat transfer coefficients are measured in a range of mass fluxes from 23.4 to 152.7 kg/m(2) s, heat fluxes from 10 to 715 kW/m(2) and quality up to 0.8. The effects of mass flux, heat flux and quality on the boiling heat transfer coefficient are examined. Large heat transfer enhancement is observed and existing flow boiling correlations largely underpredict the heat transfer coefficient especially for a low heat flux condition. The underprediction gradually decreases with increasing heat flux. The dominant flow pattern in the tube is a slug-annular or an annular flow, and then liquid film evaporation is found to dominate the heat transfer. A heat transfer prediction method is proposed to reproduce the heat transfer coefficient in the flow pattern. The Katto's critical heat flux (CHF) correlation consistently predicts the present CHF values but overpredicts by 20%. (C) 2003 Elsevier Inc. All rights reserved., ELSEVIER SCIENCE INC
Experiments in Thermal and Fluid Science, 2003,
[Reviewed] Pressure Drop in a Capillary Tube in Boiling Two-Phase FlowF. Kaminaga; B. Sumith; and K. Matsumura, Two-phase pressure drop is experimentally examined in a flow boiling condition in a tube of diameter 1.45 mm using water in ranges of pressure from 10 to 100 kPa, mass flux from 18 to 152 kg/m(2)s, heat flux from 13 to 646 kW/m(2), and exit quality from 0.02 to 0.77. Also, pressure drop in an adiabatic air-water two-phase flow is measured at atmospheric pressure using the same test section and mass flux ranges of liquid and gas as those in the flow boiling. Decreasing system pressure the pressure drop significantly increases at a given mass flux. Influence of vapor phase on the pressure drop is found to be large both in the adiabatic and the diabatic conditions. The frictional pressure drop correlation for the adiabatic two-phase flow is developed and applied to predict pressure drop in the flow boiling. But it cannot give satisfactory predictions. The Chisholm correlation calculating a two-phase pressure drop multiplier is modified to account the influence of vapor phase in a capillary tube and the modified correlation can predict the pressure drop in the flow boiling within an error of 20 %., AMER SOC MECHANICAL ENGINEERS
Thermal Science and Engineering, 2003,
[Reviewed] Heat transfer Characteristics in an Evaporator Section of a Looped Parallel Thermosyphon
F. Kaminaga; J. Tokuhara; Chowdhury Feroz MD and K. Matsumura
Proceedings of the 7th International Heat Pipe Symposium,, 2003
A Linear Stability Analysis of a Vapor Film in terms of the Triggering of Vapor ExplosionsM. Furuya; K. Matsumura and I.Kinoshita, A detailed analytical model to explain the vapor film collapse was developed to evaluate the occurrence conditions of self-triggering vapor explosions. The following conclusions were drawn based on linear stability analysis using the thermo-physical property of water, by linearizing and perturbing basic equations (Rayleigh-Lamb-Plesset's bubble momentum equation, the mass conservation equation, the state equation for ideal gas, and the Clausius-Clapeyron equation). The vapor film stabilizes with the reduction of the hot-liquid diameter, decrease of the condensation heat transfer coefficient, or increase of the thermal radiation coefficient. The cold-liquid viscosity and surface tension have a stabilizing effect, though this effect is negligibly small when the hot-liquid diameter is over I mm. The analysis predicts the vapor explosion occurrence limits obtained experimentally by other researchers within approximately 10 K. A simple correlation for the stability boundary is proposed by simplifying the above detailed model: the difference in cold-liquid temperature at the stability boundary between these models is less than 1 K when the condensation heat transfer coefficient is over 10(4) W/m(2 .) K and the hot-liquid temperature is lower than 2,000degreesC., TAYLOR & FRANCIS LTD
JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY, 2002,
[Reviewed] 蒸気爆発トリガリングにおける蒸気膜の線形安定性解析
古谷正裕; 松村邦仁; 木下泉
日本機械学会論文集B編, 2002
超撥水面への空気供給による摩擦抵抗低減に関する研究(第1報:気相膜形成時の流動状態と安定性)
松村邦仁; 神永文人; 齋藤寛, Lead
日本機械学会論文集B編, 2002, [Reviewed]
超撥水面への空気供給による摩擦抵抗低減に関する研究(第2報:摩擦抵抗の低減メカニズムの考察)
松村邦仁; 神永文人; 齋藤寛, Lead
日本機械学会論文集B編, 2002, [Reviewed]
流体の流れ込みによる容器内自由液面の動揺現象に関する研究(現象の分類と振動モードの支配要因
中村弘史; 神永文人; 松村邦仁
日本機械学会論文集 B編, 2001, [Reviewed]
Experimental Study on Base Triggered Vapor Explosions for Molten Tin and Water SystemK. Matsumura; H. Nariai; Y Egashira and M Ochimizu), The mechanism of explosions triggered at the bottom of a pool of liquid (i.e., base-triggered explosions) was experimentally investigated by dropping molten tin into water. We studied the effect of the tin temperature, the water temperature, the water depth, and the distance between the walls at the bottom of the pool on the tendency for explosions to occur. The experimental results showed that base-triggered explosions occurred at the bottom surface of the tank when the water temperature was near its saturation temperature. The occurrence of base-triggered explosions was also affected by the water depth. According to the interaction at the base, the observed explosions could he classified into two types: instantaneous and delayed explosions. The difference between the triggering mechanisms was explained by considering the homogeneous nucleation temperature of the water and the instantaneous interfacial temperature. The occurrence of delayed explosions was also affected by the distance between the side walls at the bottom of the pool. As the bottom surface area decreased, the tendency for base-triggered explosion increased., TAYLOR & FRANCIS LTD
Journal of Nuclear Science and Technology, 1999,
[Reviewed] Effect of Thermal Properties on the Fragmentation of Spontaneous Vapor Explosion
K. Matsumura; H. Nariai and M.. Kakimi, Lead
Proceedings of the 7th International Conference on Nuclear Engineering (ICONE-7), 1999, [Reviewed]
Self-induced Sloshing of Free Surface Caused by Free jet
H. Nakamura; F. Kaminaga and K. Matsumura
Proceedings of 7th International Conference on Nuclear Engineering (ICONE-7), 1999, [Reviewed]
Study on Condensation Heat Transfer Characteristics in a Thermosyphon with Non-Condensable Gas Effect
H. Hashimoto; F. Kaminaga and K. Matsumura
Proceedings of the 11th International Heat pipe Conference,, 1999
Property dependence on boiling heat transfer in a small diameter tube
Chowdhury Feroz MD.; F. Kaminaga and K. Matsumura
Proceedings of the 11th International Heat pipe Conference,, 1999
Boiling Heat Transfer Characteristics in Vertical Small Diameter Tubes under Sub-atmospheric Pressure and Natural Circulation Conditions
Chowdhury Feroz MD; F. Kaminaga and K. Matsumura
Heat Pipe Science and Engineering, 1998, [Reviewed]
Study on relationship between rising gas bubble and falling liquid flow in CCFL condition
F. Kaminaga; K. Matsumura; A. Ouchi and Y. Shibata
Proceedings of the 6th International Conference on Nuclear Engineering (ICONE-6), 1998, [Reviewed]
Experimental Study on the Base Triggered Spontaneous Vapor Explosions for Molten Tin-Water System
K. Matsumura; H. Nariai; Y Egashira and M Ochimizu, Lead
Proceedings of the International Seminar on Vapor Explosions and Explosive Eruptions, 1997, [Reviewed]
Self-Triggering Mechanism of Vapor Explosions for the Large-Scale Experiments Involving Fuel Simulant MeltsK. Matsumura and H. Nariai, Lead, Vapor explosions are a major safety concern in the severe accident management of nuclear power plants. Here, we investigated the self-triggering mechanism and the occurrence conditions for spontaneous vapor explosions analytically. A spontaneous vapor explosion is assumed to occur when a vapor film between a hot and a cold liquid naturally collapse. We modeled a simple system consisting of a hot liquid droplet in a pool of cold liquid. The stability of perturbed oscillations in a vapor film was then investigated analytically. The model included the effect of thermal radiation on this stability for high temperature melts. The analytical results show that the stability of a vapor film is significantly affected by the emissivity of thermal radiation and by the heat transfer coefficient for the condensation of the vapor to the subcooled cold liquid. Furthermore, as the hot liquid temperature increases, thermal radiation causes the temperature region in which the vapor film is stable to increase in size. Comparisons were then made between our analytical results and those from large-scale experiments in which vapor explosions were studied for water and molten core materials in light-water reactors. They showed that our model explains the tendency of the occurrence of vapor explosions in those experiments., TAYLOR & FRANCIS LTD
Journal of Nuclear Science and Technology, 1997
Self-Triggering Mechanism of Vapor Explosions for a Molten Tin and Water SystemK. Matsumura and H. Nariai, The self-triggering mechanism of vapor explosions was investigated analytically and experimentally using molten tin and water. First, we modeled a simple droplet system consisting of a hot liquid droplet in a pool of cold liquid. Then, to model the self-triggering mechanism, we assumed that an instability (ie. perturbed oscillation) in the vapor/cold-liquid interface produces a collapse of the vapor film, which in turn would produce a vapor explosion. To investigate the stability of perturbed oscillations in a vapor film, we did a linear stability analysis of a vapor film surrounding a hot liquid. We found that there was a region of film stability in the cold-liquid temperature where spontaneous vapor explosions did not occur.
To validate our model, we experimentally determined the thermal interaction zone (TIZ) in which spontaneous vapor explosions occur. The occurrence conditions for spontaneous vapor explosions were investigated for molten tin, as the hot liquid, dropped into a water pool, as the cold liquid. We varied the tin temperature and the water temperature, and then monitored the occurrence and location of spontaneous vapor explosions. Sire found that the upper limit for the water temperature of the TIZ can be explained by our model., TAYLOR & FRANCIS LTD
Journal of Nuclear Science and Technology, 1996,
[Reviewed] The Occurrence Condition of Spontaneous Vapor Explosions
K. Matsumura and H. Nariai
Proceedings of the ASME-JSME 4th International Conference on Nuclear Engineering (ICONE-4), 1996
Effect of Ethanol Addition on the Self-Triggering of Tin-Water Steam Explosion
K. Matsumura; M. Sakurai and H. Nariai, Lead
Proceedings of the ASME-JSME Thermal Engineering Joint Conference, 1995, [Reviewed]
Thermal Interaction Zone and Self-triggering mechanism of tin-water system
K. Matsumura; H. Nariai; and M. Sakurai
Proceedings of the Multidiciplinary International Seminar on Intence Multiphase Interaction, 1995, [Reviewed]
Thermal Interaction Zone of Vapor Explosion with Tin-Water Drop Experiment
K. Matsumura and H. Nariai, Lead
Proceedings of the 4th International Topical Meeting on Nuclear Thermal Hydraulics, Operations and Safety, 1994, [Reviewed]
