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Masamitsu Mizuki

Bio: Masamitsu Mizuki is an academic researcher. The author has contributed to research in topics: Boiling & Heat transfer coefficient. The author has an hindex of 1, co-authored 1 publications receiving 13 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the boiling heat transfer coefficient for the optimum surface structure was investigated on stainless steel metal fiber sintered surfaces with Freon 11 (Rll) as the working fluid.
Abstract: Boiling heat transfer performance on stainless steel metal fiber sintered surfaces is experimentally investigated with Freon 11 (Rll) as the working fluid. The boiling heat transfer coefficient for the optimum surface structure gives a tenfold improvement over a smooth surface. The nondimensional specific parameter including all design parameters is introduced to explain the trend of the performance of various kinds of metal fiber sintered surfaces. Moreover, the metal fiber sintered surface clad with titanium film is suggested to be appropriate to an evaporator for Ocean Thermal Energy Conversion (OTEC)system.

13 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, a modified pore classification is proposed for use in the development of a dynamic model to predict the boiling coefficient of seven different porous coatings, based on the assumption and derivation of O'Neill's static boiling model.
Abstract: Boiling test results and theoretical evaluations related to predictive models for the boiling coefficient with porous coatings are critically surveyed. Consideration is limited to boiling pure fluids and coatings made of spherical particles of uniform diameter. The data for seven different porous coatings suggest that particle diameter has very little effect on performance. The preferred coating thickness is in the range of three to four particle diameters. Detailed consideration of cavity stability requirements suggests that a dynamic model is needed to rationally predict the boiling coefficient. A modified pore classification is proposed for use in the development of a dynamic model. The assumption and derivation of O'Neill's static boiling model is presented. Its ability to predict the boiling coefficient is evaluated by a comparison with the values predicted by an empirical correlation developed by Nishikawa and Ito.

103 citations

Journal ArticleDOI
TL;DR: In this paper, a hybrid bi-modal wick structure was designed and fabricated with the objective to simultaneously enhance performance in capillary pumping, permeability and evaporative heat transfer.
Abstract: A new hybrid bi-modal wick structure was designed and fabricated in this study with the objective to simultaneously enhance performance in capillary pumping, permeability and evaporative heat transfer. Utilizing substrates with large pores and sintered powders, a highly integrated bi-modal wick structure was created with small pores lining the walls of the large pores. This unique structure can be tailored to a number of different configurations, including uniform, radial and axially varied pore morphologies. Tests of heat pipes containing the bi-modal wick structure in various configurations revealed increases in effective thermal conductivity by as much as 400% as compared to baseline heat pipes containing monolithic wick materials such as copper mesh.

54 citations

Journal ArticleDOI
TL;DR: In this article, composite wick heat pipe configurations were fabricated from a biporous structure comprised of fine nickel metal powders sintered onto layers of coarse pore copper mesh, and the effects of both enhanced evaporation heat transfer at the liquid/vapor interface and the extension of the capillary limit were explored.
Abstract: This study examines the enhancement of heat pipe thermal performance through the employment of composite wicks Wicks were fabricated from a biporous structure comprised of fine nickel metal powders sintered onto layers of coarse pore copper mesh Wick structures were designed to explore the effects of both enhanced evaporation heat transfer at the liquid/vapor interface and the extension of the capillary limit A number of composite wick heat pipe configurations were fabricated and tested to assess performance improvements in comparison to conventional designs Horizontal, gravity-assisted, and against-gravity tests were conducted to determine whether these designs were orientation-dependent At various heat inputs, some configurations achieved thermal performance levels greater than three times higher than those of conventional heat pipes During against-gravity tests, virtually all composite designs exhibited improved performance over the conventional heat pipe at all heat inputs These results clearly

50 citations

Journal ArticleDOI
TL;DR: In this paper, the experimental results of a porous-coated plate system demonstrate as much as a 200% increase in heat flux (represented by an average Nusselt number) as compared to the experimental data of a plain copper surface.
Abstract: Condensation experiments are performed on vertical isothermal porous metallic-coated plates which are immersed in saturated steam containing noncondensable gas at atmospheric pressure. The experimental results of a porous-coated plate system demonstrate as much as a 200% increase in heat flux (represented by an average Nusselt number) as compared to the experimental data of a plain copper surface. A comparison of the experiments with a theoretical model based on porous/fluid composite condensation that has been previously published shows relative agreement. The results of this investigation highlight the potential that exists for enhanced condensation when a porous metallic coating is utilized.

19 citations

Journal ArticleDOI
TL;DR: Synthese des travaux publies et bibliographie mondiale sur le transfert de chaleur pour l'annee 1983 as discussed by the authors.

16 citations