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 : 2025-01-01 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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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 (N_s,a) of MC-STR (α = 0.75, β = 0.3) reaches the lowest value of 0.422 for Re = 593.

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交错截断肋对微通道散热器热水力性能及熵产的影响

提出了一种交错截断肋（MC-STR）微通道。在雷诺数223 ~ 593范围内，通过数值模拟研究了肋高比（α）和肋宽比（β）对热工性能和熵产的影响。首先，为了比较不同α构型的MC-STR，对传统的肋状微通道（MC-TR）和光滑微通道（MC-S）进行了数值分析。随后的分析进一步研究了β对MC-STR对流换热的影响。结果表明，MC-STR显著增强了传热，降低了受热壁温度。增加α和β导致更高的努塞尔特数(ν)和摩擦系数(f)。MC-TR相比,MC-STR有效减少压降损失和展品更高να = 0.75和α 对于大多数Re = 0.5。总的来说,最高的综合热性能因素(压电)1.355 MC-STR(α = 0.5,β = 0.3)是获得 = 593。此外，MC-STR （α = 0.75,β = 0.3）的增强熵产数（Ns,a）在Re = 593时达到最低值0.422。

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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.