In this study, a numerical analysis of a microchannel with the different configuration of varying height of pin fins entrenched at the bottom of the channel base wall has been carried out. Five different configurations of pin fins arrangement which are considered in this study are, Case 1(Full length fins in complete microchannel), Case 2(Full length fins at the upstream), Case 3(Full length fins at the downstream), Case 4(Full length fin at the center of microchannel), Case 5(Full length fins at the inlet and exit of microchannel) and the results of these five cases are compared with the plain rectangular microchannel. In this investigation, deionized ultra-filtered water is used and Reynold’s number is ranging from 150 to 350. Results reveals that the highest Nusselt number is achieved by case 2 at a lesser value of Reynold’s number while by case 5 at higher Reynold’s number and the lowest pressure drop is occurring in case 4. The overall thermal performance of case 2 beats the corresponding cases.
In the current study, a numerical analysis has been performed to examine the performance characteristics of the slotted microchannel heat sink. Twelve equidistant slots are entrenched at the base wall of the channel. Four different shapes of slots are considered in this study. They are rectangular (case 1), trapezoidal (case 2), V (case 3) and curved shaped (case 4). Numerical simulations have been performed for these cases with Reynold’s number ranging between 150 to 350 with a constant heat flux of 100 W/cm2 and the results are compared with the plain channel. It is observed that cases 1 and 2 have higher overall thermal performance than the plain channel in which case 2 outperforms case 1 whereas the performance of cases 3 and 4 are lower than the plain microchannel. It is suggested from the analysis that the plain microchannel may be replaced by a trapezoidal shape slotted microchannel in further studies.
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