Tuesday, October 7, 2008

MICRO CHANNEL FLOW.

In micro channel flow the fluid passes through channels of hydraulic diameters in the order of millimeter.currently many people are working on this topic.The need for cooling solutions of small sizes is the main reason for the research in this particular area. Many people have been working on this area since 1980.
it was Tuckerman and pease(1980) who initiated experiments in this area and found deviations from conventional correlations. later WU and Little reported the same discrepancies followed by Choi Et Al ,Yu Et aL,Mala and Li etc.All the results so far quoted were based on experimental work.But in 2004, owahib came up with his experimental investigations that the heat transfer correlations were in accordance with the conventional ones.Then Lee and Garimella (2004) came with some ting new .They conducted NUMERICAL INVESTIGATIONS considering the effects of thermal boundary layers and all.Their numerical investigations were clearly in accordance with the conventional ones.Their work consisted of different cases ,they meticulously took into effect the of thermal and boundary layer . They conducted simulations for all the possible cases and came up with conclusion that the discrepancies which were found were because of the boundary layer effects.In the paper they have published various cases and in each case the numerical investigations were in accordance with the results which were in accordance with work earlier. LEE ,V.Garimella, Khandilekar are few of the people who are working extensively in this area.
To sum up, the micro channel flows and mini channel flows are in accordance with the conventional correlations .one has to be very careful in understanding the type of flow he is dealing with because in cases where flow is not completely developed the Nusselt number would be more than Expected .

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