The Effect of Aspect Ratio and Temperature-dependent Fluid properties of Effective Parameters in Micro Heat Exchanger

Document Type : Research Article

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Abstract

In this work a rectangular micro heat exchanger with constant hydraulic diameter at various aspect ratios was considered. The pressure drop and thermal parameters of the micro heat exchanger in laminar flow at different Reynolds numbers (25, 50, 100, 150, 225 and 300) at constant heat flux of 0.3 MWatt/m2 were analyzed and compared. Also, the effect of temperature-dependent fluid properties (viscosity, conductivity coefficient) on the pressure drop and the average and maximum temperature rise of fluid and thermal resistance of micro heat exchanger were investigated. Finally, a new criterion based on pumping power and transmitted heat per temperature gradient unit was proposed as a tool to evaluate micro heat exchangers' performance.

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References

[1] S. Wongwises, Critical review of heat transfer characteristics of nanofluids, Renewable and Sustainable Energy Reviews 11 (2007) 512–523
[2] Reiyu Chein, Experimental microchannel heat sink performance studies using nanofluids, International
Journal of Thermal Sciences 46 (2007) 57–66
[3] J. Koo, Laminar nanofluid flow in microheat-sinks, International Journal of Heat and Mass Transfer 48 (2005) 2652–2661.
[4] Jaeseon Lee, Assessment of the effectiveness of nanofluids for single-phase and two-phase heat transfer in microchannels, International Journal of Heat and Mass Transfer 50 (2007) 452–463.
[5] Poh-Seng Lee, Suresh V. Garimella, Thermally developing flow and heat transfer in rectangular microchannels of different aspect ratios, International Journal of Heat and mass transfer 49 (2006) 3060–3073.
[6] J. Li , G.P. Peterson, 3-Dimensional numerical optimization of silicon-based high performance parallel microchannel heat sink with liquid flow, International Journal of Heat and Fluid Flow 50 (2007) 2895–2904.
[7] www.intel.com
[8] Intel® Pentium® 4 Processor on 90nm Process in the 775-land LGA Package for Embedded Applications Thermal Design Guide (302822).
[9] Y.Chen, Three dimensional numerical simulation of heat and fluid flow in noncircular microchannel heat sinks, International Communications in Heat and Mass Transfer, 2009.
[10] W.M Rohsenow, J.PHartnett, Y.I Cho, HANDBOOK OF HEAT TRANSFER,1998, Third Edition.
[11] J. Judy, D. Maynes, B.W. Webb, Characterization of frictional pressure drop for liquid flows through microchannels, International Journal of Heat and Mass Transfer 45 (2002) 3477–3489.

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