Scholarlink

<p>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. This study presents a coupled analysis of microchannel wettability, bubble morphology, flow field characteristics, and heat transfer performance. The dual mechanism of short-term enhancement and long-term degradation induced by large vortices in hydrophobic channels is investigated, and a clear distinction between these effects is established. Quantitative analysis reveals distinct growth patterns of critical heat flux (CHF) with respect to wettability before and after the threshold. 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&#xa0;kg m<sup>−2</sup>&#xa0;s<sup>−1</sup>), 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.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

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

  • 期刊论文

  • 发表日期：

    2026年5月25日

查看全文
  • Zhaotong Zhang,
  • Xilong Zhang,
  • Fei Wang,
  • Yongkang Niu,
  • Yongliang Zhang,
  • Chen Yang

摘要

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. This study presents a coupled analysis of microchannel wettability, bubble morphology, flow field characteristics, and heat transfer performance. The dual mechanism of short-term enhancement and long-term degradation induced by large vortices in hydrophobic channels is investigated, and a clear distinction between these effects is established. Quantitative analysis reveals distinct growth patterns of critical heat flux (CHF) with respect to wettability before and after the threshold. 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 m−2 s−1), 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.