Analysis of flow boiling heat transfer characteristics in microchannels with hydrophilic/hydrophobic structured surfaces

Analysis of flow boiling heat transfer characteristics in microchannels with hydrophilic/hydrophobic structured surfaces | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Analysis of flow boiling heat transfer characteristics in microchannels with hydrophilic/hydrophobic structured surfaces Zhaotong zhang, Xilong Zhang, Yongkang Niu, Yongliang Zhang, Yang Chen This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8374362/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract This study employs computational modeling of straight microchannels with hydrophilic and hydrophobic surfaces to examine the influence of surface wettability on bubble morphology, flow field disturbance, and pressure distribution around bubbles in rectangular microchannels using the Volume of Fluid (VOF) approach. The analysis focuses on variations in average wall temperature under different mass flow rates and heat fluxes, as well as the effect of mass flow rate on critical heat flux (CHF). Findings reveal that the average wall temperature in hydrophilic microchannels exceeds that in hydrophobic ones, accompanied by more notable temperature fluctuations. The critical heat flux in hydrophilic microchannels is substantially higher, showing increases of 70% and 64%, respectively. When mass flow rate surpasses a certain threshold (above 400 kg/m²·s), the CHF growth rate in hydrophilic channels decelerates (from 29% to 11%), whereas it accelerates in hydrophobic channels (from 12% to 32%). These behaviors are closely linked to bubble morphology and their dynamic instabilities. The outcomes offer valuable insights for enhancing microchannel surface design to improve the thermal efficiency of two-phase flow systems. Microchannel Flow boiling Wettability Heat transfer CHF Contact angle Full Text Additional Declarations No competing interests reported. Supplementary Files Table.docx Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. 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