Effects of staggered truncated ribs on thermal-hydraulic performance and entropy generation of microchannel heat sinks

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2024-12-02 DOI:10.1016/j.csite.2024.105597

Dongkai Wang, Lirui Xue, Chang Liu, Haitao Chen, Changquan Xia, Qinyu Qian, Liwen Cheng

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引用次数: 0

Abstract

A microchannel with staggered truncated ribs (MC-STR) is presented. The effects of rib height ratio (α) and rib width ratio (β) on the thermal-hydraulic performance and entropy generation are investigated by numerical simulation at the Reynolds numbers (Re) range of 223–593. Initially, to compare the MC-STR of different α configurations, the traditional ribbed microchannel (MC-TR) and the smooth microchannel (MC-S) are also numerically analyzed. Subsequent analysis further investigates the effect of β on convective heat transfer in MC-STR. The results indicate that MC-STR significantly enhances the heat transfer and reduces the heated wall temperature. Increasing α and β results in higher Nusselt number (Nu) and friction coefficient (f). Compared to MC-TR, MC-STR effectively reduces pressure drop losses and exhibits higher Nu at α = 0.75 and α = 0.5 for most Re. Overall, the highest comprehensive thermal performance factor (PEC) of 1.355 for MC-STR (α = 0.5, β = 0.3) is attained at Re = 593. Furthermore, the augmentation entropy generation number (Ns,a) of MC-STR (α = 0.75, β = 0.3) reaches the lowest value of 0.422 for Re = 593.

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.