Analysis of heat transfer enhancement in microchannel by varying the height of pin fins at upstream and downstream region

Abstract

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.

Effect of undercut slots on the overall performance of microchannel heatsink

“…Prajapati [12] in their work revealed the effect of the length of the fins and reported an enhancement of heat transfer upto 0.8 mm height of fin and a further increase in height retards the heat transmission whereas pressure drop always increases with height. Nawaz et al [13] in their study reveals that descending height fins at inlet side and ascending arrangement at outlet side has the highest heat transfer capability also they impement the circular perforated pinfin in the rectangular microchannel heat sink to improve the performance of microchannel [14] . According to the above-mentioned literature, investigators have put a lot of effort into the upliftment of heat transfer performance of heat sinks by implementing extended surfaces of various shapes and sizes along the length of the microchannel.…”

Computational Study of Hydrothermal Performance of Microchannel Heat Sink With Trefoil Shape Ribs

“…Different researches adopted many strategies to improve performance of MCHS. The passive approach of interruption of flow in a microchannel is one of the most effective ways to improve heat transfer [6][7][8][9][10][11]. For example, Ahmad et al [12] performed numerical simulations to investigate the performance of MCHS with side wall configuration of different types of ribs.…”

Optimization of Microjet Location Using Surrogate Model Coupled with Particle Swarm Optimization Algorithm

“…Various computation-intensive studies have been performed in the past exploring the effect of fluid flow characteristics and the heat-transfer effects. The micro-cooling devices encompass the use of microchannels [2][3][4][5], porous materials [6], and microjets [7][8][9][10][11][12][13][14] with a promising future in all types of designs. However, each of them has its own set of challenges, from the design stage to the manufacturing stage.…”