Single Re-entrant micropillar arrays for enhanced pool boiling performance

IF 5.8 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Heat and Mass Transfer Pub Date : 2025-07-03 DOI:10.1016/j.ijheatmasstransfer.2025.127473

Saumyadwip Bandyopadhyay , Qi-Jun Chen , Ming-Chang Lu

{"title":"Single Re-entrant micropillar arrays for enhanced pool boiling performance","authors":"Saumyadwip Bandyopadhyay , Qi-Jun Chen , Ming-Chang Lu","doi":"10.1016/j.ijheatmasstransfer.2025.127473","DOIUrl":null,"url":null,"abstract":"<div><div><em>Re</em>-entrant cavities are well-known for enhancing pool boiling by stabilizing vapor bubbles; however, the potential of <em>Re</em>-entrant pillar structures remains underexplored. This study investigates, for the first time, the effects of single <em>Re</em>-entrant micropillar (SR) structures on pool boiling heat transfer. We fabricated and tested four types of silicon surfaces: flat SiO₂, micropillar (MP), single <em>Re</em>-entrant micropillar (SR), and single <em>Re</em>-entrant micropillar with PTFE-coated top surfaces (SRT). Experimental results show that the SRT surface achieves a 219 % enhancement in heat transfer coefficient (HTC) and a 61.5 % increase in critical heat flux (CHF) compared to the flat surface. The HTC correlates positively with nucleation site density (NSD), which was quantified through thermal imaging. Force analysis further reveals that the <em>Re</em>-entrant geometry imposes significant resistance to bubble growth, anchoring liquid within the microstructures and delaying CHF onset. These findings demonstrate that <em>Re</em>-entrant pillar structures substantially enhance both HTC and CHF, offering a promising design strategy for next-generation thermal management surfaces.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"252 ","pages":"Article 127473"},"PeriodicalIF":5.8000,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Heat and Mass Transfer","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0017931025008117","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}

引用次数: 0

Abstract

Re-entrant cavities are well-known for enhancing pool boiling by stabilizing vapor bubbles; however, the potential of Re-entrant pillar structures remains underexplored. This study investigates, for the first time, the effects of single Re-entrant micropillar (SR) structures on pool boiling heat transfer. We fabricated and tested four types of silicon surfaces: flat SiO₂, micropillar (MP), single Re-entrant micropillar (SR), and single Re-entrant micropillar with PTFE-coated top surfaces (SRT). Experimental results show that the SRT surface achieves a 219 % enhancement in heat transfer coefficient (HTC) and a 61.5 % increase in critical heat flux (CHF) compared to the flat surface. The HTC correlates positively with nucleation site density (NSD), which was quantified through thermal imaging. Force analysis further reveals that the Re-entrant geometry imposes significant resistance to bubble growth, anchoring liquid within the microstructures and delaying CHF onset. These findings demonstrate that Re-entrant pillar structures substantially enhance both HTC and CHF, offering a promising design strategy for next-generation thermal management surfaces.

查看原文本刊更多论文

用于提高池沸腾性能的单重入微柱阵列

重入式空腔是众所周知的通过稳定蒸汽泡来提高池沸腾；然而，再入式支柱结构的潜力仍未得到充分探索。本文首次研究了单重入微柱（SR）结构对池沸腾换热的影响。我们制作并测试了四种类型的硅表面：扁平SiO₂，微柱（MP），单重入微柱（SR）和单重入微柱与ptfe涂层的顶部表面（SRT）。实验结果表明，与平面相比，SRT表面的传热系数（HTC）提高了219%，临界热通量（CHF）提高了61.5%。HTC与成核位点密度（NSD）呈正相关，这是通过热成像量化。力分析进一步表明，重入式几何结构对气泡生长具有显著的阻力，将液体锚定在微观结构中，并延迟CHF的发生。这些发现表明，可重新进入的支柱结构大大提高了HTC和CHF，为下一代热管理表面提供了一种有前途的设计策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

International Journal of Heat and Mass Transfer 工程技术-工程：机械

CiteScore

10.30

自引率

13.50%

发文量

1319

审稿时长

41 days

期刊介绍： International Journal of Heat and Mass Transfer is the vehicle for the exchange of basic ideas in heat and mass transfer between research workers and engineers throughout the world. It focuses on both analytical and experimental research, with an emphasis on contributions which increase the basic understanding of transfer processes and their application to engineering problems. Topics include: -New methods of measuring and/or correlating transport-property data -Energy engineering -Environmental applications of heat and/or mass transfer