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CONDENSATION IN MINICHANNELS: EXPERIMENTAL INVESTIGATION AND NUMERICAL MODELING
Interfacial Phenomena and Heat Transfer, 2015This paper presents an overview of the most recent research works on condensation heat transfer inside minichannels with halogenated refrigerants. The first part is focused on the experimental results available in the scientific literature and the effect of the main parameters (channel diameter, mass velocity, vapor quality, saturation temperature ...
DEL COL, DAVIDE, BORTOLIN, STEFANO
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Effect of Minichannel Cross Sectional Shape in Condensation
2010 14th International Heat Transfer Conference, Volume 2, 2010The objective of this work is to present new condensation heat transfer coefficients measured inside a single square cross section minichannel, having a 1.18 m side length, and compare them to the ones measured in a circular minichannel. This subject is particularly interesting since most of the mini and microchannels used in practical applications ...
DEL COL, DAVIDE +3 more
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Subcooled Flow Boiling in a Minichannel
Heat Transfer Engineering, 2009It has been considered that the dry-out is easy to occur in boiling heat transfer for a small channel, a mini or microchannel because the channel was easily filled with coalescing vapor bubbles. In the present study, the experiments of subcooled flow boiling of water were performed under atmospheric condition for a horizontal rectangular channel of ...
Akira Oshima +3 more
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Onset of nucleate boiling in minichannels
International Journal of Thermal Sciences, 2000Abstract Heat transfer characteristics during flow boiling in a minichannel were studied. For these investigations a thermographic measuring method was used. The axial distribution of the external wall temperature was measured, from which the internal wall temperatures and the local heat transfer coefficient are calculable.
Ingo Hapke +2 more
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Gas-assisted evaporation and boiling in minichannels
International Journal of Heat and Mass Transfer, 2018Abstract This study experimentally explores the heat transfer characteristics of gas-assisted evaporation and boiling in single or two parallel minichannels under both non-boiling and boiling conditions. The liquid working fluid used is ethanol and the inert gas is helium.
Ben-Ran Fu +3 more
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Numerical Investigation of Turbulence Models for Minichannels
ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels: Parts A and B, 2010Due to having considerably small diameters compared to the macro channels; validation of conventional models and correlations and, examination of heat transfer and flow characteristics for mini/micro channels have been an attractive subject for last decades.
Emrah Deniz, Nur Pehlivanoglu
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Upflow Boiling and Condensation in Rectangular Minichannels
1st International Conference on Microchannels and Minichannels, 2003When boiling or condensation occurs inside very small and non-circular channels, capillary forces influence two-phase flow patterns, which in turn determine heat transfer coefficients and pressure drop. A better understanding of the underlying phenomena would be beneficial from the perspective of optimizing the design of compact evaporators and ...
V. V. Kuznetsov +4 more
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Computational Optimization of a Groove-Enhanced Minichannel
Heat Transfer Engineering, 2011To meet the challenging thermal requirements of modern power electronics, surface enhancements are being considered to improve the performance of single-phase microchannels. A simple modification of a surface dimple—a two-dimensional groove—is considered due to its significant potential enhancement yet simple manufacture.
Thomas E. Conder, Stephen A. Solovitz
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Numerical Simulation of Condensation in a Minichannel
ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer, Volume 2, 2009A steady-state Volume of Fluid (VOF) simulation of condensation of R134a inside a 1 mm i.d. minichannel is proposed. The minichannel is horizontally oriented and both the effects of gravity and surface tension are taken into account. A uniform interface temperature, as well as a uniform wall temperature, were fixed as boundary conditions in order to ...
DA RIVA, ENRICO, DEL COL, DAVIDE
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Cooling of minichannel heat sink using nanofluids
International Communications in Heat and Mass Transfer, 2012Abstract Nanofluids contain a small fraction of solid nanoparticles in base fluids. Nanofluids cooled small channel heat sinks, have been anticipated to be an excellent heat dissipation method for the next generation electronic devices. In this study, nanofluids are used with different volume fractions of nanoparticles as a coolant for the ...
Ijam, A., Saidur, Rahman, Ganesan, P.
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