Functional Materials and Advanced Manufacturing

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67 Heat Transfer in Noncircular Microchannel

4.3.2 CONSTANT WALL BOUNDARY CONDITION

4.3.2.1 Variation of Average Heat Transfer Coefcient

Average heat transfer coefcient for the nanouid in both the rectangular and trian-

gular ducts can be calculated using Equation 4.18. The variation of h with Re for dif-

ferent volume fractions is shown in Figure4.5. The heat transfer coefcients in both

the microchannels are found to be increased with the increase in Re, and the maxi-

mum h is found when the highest volume fraction, i.e., ɸ = 4%, is used. This trend is

quite consistent with the previously published results [ ...