Conjugate heat transfer analysis of mist-assisted film cooling of a mini-channel embedded flat plate

IF 6.4 2区工程技术 Q1 MECHANICS International Communications in Heat and Mass Transfer Pub Date : 2024-10-17 DOI:10.1016/j.icheatmasstransfer.2024.108204

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Abstract

This article presents a three-dimensional conjugate heat transfer analysis for mist-assisted air film cooling applied to a flat plate. In this computational fluid dynamics (CFD) investigation, a flat plate with 11 film holes served as the baseline configuration. A mini-channel was integrated into the plate wall to investigate the influence of a mini-channel on cooling performance. Steady-state simulations were conducted at a constant blowing ratio

M = 0.5

, with dry air serving as the coolant and mist concentrations ranging from 2 % to 6 %. The study revealed that mist-assisted film cooling outperforms air film cooling for both the flat plate with only film cooling (FC) and the plate with impingement mini-channel film cooling (IMFC). Notably, both air and mist-assisted cooling exhibited similar qualitative trends. For droplet size of

5 μm

, the area-weighted average effectiveness of the IMFC plate showed an improvement of ∼112 % compared to the FC plate with air cooling. Additionally, it was discovered that cooling performance increased with higher mist concentrations; for 6 % mist concentration (by mass), the area-weighted effectiveness was enhanced by ∼177 % for the FC plate.

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微型通道嵌入式平板的雾辅助薄膜冷却的共轭传热分析

本文介绍了应用于平板的雾辅助气膜冷却的三维共轭传热分析。在这项计算流体动力学（CFD）研究中，以带有 11 个薄膜孔的平板为基准配置。平板壁上集成了一个微型通道，以研究微型通道对冷却性能的影响。在吹气比 M=0.5 的恒定条件下进行了稳态模拟，以干燥空气作为冷却剂，雾的浓度范围为 2% 至 6%。研究表明，对于仅采用薄膜冷却（FC）的平板和采用撞击微型通道薄膜冷却（IMFC）的平板，雾气辅助薄膜冷却的性能均优于空气薄膜冷却。值得注意的是，空气冷却和雾辅助冷却呈现出相似的质量趋势。在液滴尺寸为 5μm 的情况下，IMFC 平板的面积加权平均效率比采用空气冷却的 FC 平板提高了 112%。此外，研究还发现，雾浓度越高，冷却性能越好；当雾浓度为 6%（按质量计）时，FC 板的面积加权效率提高了 ∼177%。

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来源期刊

International Communications in Heat and Mass Transfer 工程技术-力学

CiteScore

11.00

自引率

10.00%

发文量

648

审稿时长

32 days

期刊介绍： International Communications in Heat and Mass Transfer serves as a world forum for the rapid dissemination of new ideas, new measurement techniques, preliminary findings of ongoing investigations, discussions, and criticisms in the field of heat and mass transfer. Two types of manuscript will be considered for publication: communications (short reports of new work or discussions of work which has already been published) and summaries (abstracts of reports, theses or manuscripts which are too long for publication in full). Together with its companion publication, International Journal of Heat and Mass Transfer, with which it shares the same Board of Editors, this journal is read by research workers and engineers throughout the world.