This paper aims to model a subcooled flow boiling in a vertical stainless-steel micro-channel with an upward flow in 1 mm diameter, 40 mm length and 0.325 mm thickness tube. Water has been considered as a working fluid. The heat flux varies from 600 - 750 kW·m-2, input velocity from 1 - 2 m·s-1, and the subcooled temperature varies from 59.6 - 79.6 K. The working pressure and saturation temperature are 1 atm and 372.75 K, respectively. The results show that, the flow boiling keeps the temperature of the channel wall lower and more uniform than a single-phase flow, as long as the flow boiling does not reach the dry-out point. The onset point of dry-out depends on three factors, heat flux, inlet velocity, and subcooled temperature. In addition, the dry-out occurs at a point near the channel inlet with increased heat flux and subcooled temperature. Decreasing the inlet velocity would also cause the dry-out point to shift closer to the inlet of the channel.
References
[1]
Falsetti, C., Magnini, M. and Thome, J.R. (2018) Hydrodynamic and Thermal Analysis of a Micro-Pin Fin Evaporator for On-Chip Two-Phase Cooling of High Density Power Micro-Electronics. Applied Thermal Engineering, 130, 1425-1439. https://doi.org/10.1016/j.applthermaleng.2017.10.117
[2]
Radwan, A., Ookawara, S., Mori, S. and Ahmed, M. (2018) Uniform Cooling for Concentrator Photovoltaic Cells and Electronic Chips by Forced Convective Boiling in 3D-Printed Monolithic Double-Layer Microchannel Heat Sink. Energy Conversion and Management, 166, 356-371. https://doi.org/10.1016/j.enconman.2018.04.037
[3]
Saisorn, S., Kaew-On, J. and Wongwises, S. (2013) An Experimental Investigation of Flow Boiling Heat Transfer of R-134a in Horizontal and Vertical Mini-Channels. Experimental Thermal and Fluid Science, 46, 232-244. https://doi.org/10.1016/j.expthermflusci.2012.12.015
[4]
Harirchian, T. and Garimella, S.V. (2009) Effects of Channel Dimension, Heat Flux, and Mass Flux on Flow Boiling Regimes in Microchannels. International Journal of Multiphase Flow, 35, 349-362. https://doi.org/10.1016/j.ijmultiphaseflow.2009.01.003
[5]
Ong, C.L. and Thome, J.R. (2009) Flow Boiling Heat Transfer of R134a, R236fa and R245fa in a Horizontal 1.030 mm Circular Channel. Experimental Thermal and Fluid Science, 33, 651-663. https://doi.org/10.1016/j.expthermflusci.2009.01.002
[6]
Owhaib, W., Martın-Callizo, C. and Palm, B. (2004) Evaporative Heat Transfer in Vertical Circular Microchannels. Applied Thermal Engineering, 24, 1241-1253. https://doi.org/10.1016/j.applthermaleng.2003.12.030
[7]
Yu, W., France, D.M., Wambsganss, M.W. and Hull, J.R. (2002) Two-Phase Pressure Drop, Boiling Heat Transfer, and Critical Heat Flux to Water in a Small-Diameter Horizontal Tube. International Journal of Multiphase Flow, 28, 927-941. https://doi.org/10.1016/S0301-9322(02)00019-8
[8]
Zhang, L., Koo, J.M., Jiang, L., Asheghi, M., Goodson, K.E., Santiago, J.G. and Kenny, T.W. (2002) Measurements and Modeling of Two-Phase Flow in Microchannels with Nearly Constant Heat Flux Boundary Conditions. Journal of Microelectromechanical Systems, 11, 12-19. https://doi.org/10.1109/84.982858
[9]
Hosseini, R., Gholaminejad, A. and Nabil, M. (2011) Concerning the Effect of Surface Material on Nucleate Boiling Heat Transfer of R-113. Journal of Electronics Cooling and Thermal Control, 1, 22-27. https://doi.org/10.4236/jectc.2011.12003
[10]
Hosseini, R., Gholaminejad, A. and Jahandar, H. (2011) Roughness Effects on Nucleate Pool Boiling of R-113 on Horizontal Circular Copper Surfaces. World Academy of Science, Engineering and Technology, 55, 679-684.
[11]
Li, H., Vasquez, S.A., Punekar, H. and Muralikrishnan, R. (2011) Prediction of Boiling and Critical Heat Flux Using an Eulerian Multiphase Boiling Model. In: ASME 2011 International Mechanical Engineering Congress and Exposition, American Society of Mechanical Engineers Digital Collection, 463-476. https://doi.org/10.1115/IMECE2011-65539
[12]
Fluent, A.N.S.Y.S. 16.2: Fluent Theory Guide. ANSYS Help Viewer.
[13]
Kurul, N. and Podowski, M.Z. (1991) On the Modeling of Multidimensional Effects in Boiling Channels. Proceedings of 27th National Heat Transfer Conference, Minneapolis, 28-31 July 1991, 30-40.
[14]
Del Valle, V.H. and Kenning, D.B.R. (1985) Subcooled Flow Boiling at High Heat Flux. International Journal of Heat and Mass Transfer, 28, 1907-1920. https://doi.org/10.1016/0017-9310(85)90213-3
[15]
Cole, R. (1960) A Photographic Study of Pool Boiling in the Region of the Critical Heat Flux. AIChE Journal, 6, 533-538. https://doi.org/10.1002/aic.690060405
[16]
Tolubinsky, V.I. and Kostanchuk, D.M. (1970) Vapour Bubbles Growth Rate and Heat Transfer Intensity at Subcooled Water Boiling. In: International Heat Transfer Conference, Begel House Inc., Danbury, 1-11. https://doi.org/10.1615/IHTC4.250
[17]
Lemmert, M. and Chawla, J.M. (1977) Influence of Flow Velocity on Surface Boiling Heat Transfer Coefficient. In: Hahne, E. and Grigull, U., Eds., Heat Transfer in Boiling, Academic Press and Hemisphere, New York, 237-247.
[18]
Kocamustafaogullari, G. and Ishii, M. (1995) Foundation of the Interfacial Area Transport Equation and Its Closure Relations. International Journal of Heat and Mass Transfer, 38, 481-493. https://doi.org/10.1016/0017-9310(94)00183-V
[19]
Ioilev, A., Samigulin, M., Ustinenko, V., Kucherova, P., Tentner, A., Lo, S. and Splawski, A. (2007) Advances in the Modeling of Cladding Heat Transfer and Critical Heat Flux in Boiling Water Reactor Fuel Assemblies. 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, Pittsburgh, September 2007, 47.
Kim, S.M. and Mudawar, I. (2014) Review of Databases and Predictive Methods for Heat Transfer in Condensing and Boiling Mini/Micro-Channel Flows. International Journal of Heat and Mass Transfer, 77, 627-652. https://doi.org/10.1016/j.ijheatmasstransfer.2014.05.036
