The performance of liquid water in the double layer microchannel has been analysed using three-dimensional conjugate heat transfer analysis. The effect of flow rate on the counter and parallel arrangement of each fluid is studied for three different lengths. Furthermore, cooling capability of liquid water is compared at the same length with flow rate and pumping power as governing parameters. The performance of fluid was judged on the basis of maximum temperature attained and minimum temperature variations at the heated region. Interesting results have been found showing the effect of specific heat on the type of arrangement for liquid water with similar observation for water for low Reynolds number and relatively longer length. Among liquid water, above certain pumping power use of liquid water is found to be favourable for a shorter length of the double layer microchannel. Furthermore, the range of flow rate and pumping power showing superior performance with water was found to increase with the length.

Keywords : Microchannel, Axial Heat Conduction, Conjugate Heat Transfer, Thermally Developing Flow, Optimum Nusselt Number.