Study on flow boiling heat transfer mechanism of R134a in microchannels with high-aspect-ratio

FENG Yali; JIANG Zhuye; HU Chengyu; YANG Xiaoping; ZHANG Yonghai; HUI Fangjiao; ZHANG Zhiwei; WEI Jinjia

doi:10.11949/0438-1157.20260629

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Study on flow boiling heat transfer mechanism of R134a in microchannels with high-aspect-ratio

更新时间：2026-08-04

- Study on flow boiling heat transfer mechanism of R134a in microchannels with high-aspect-ratio
- CIESC Journal (2026)
- 作者机构：
  
  1.西安交通大学化学工程与技术学院，陕西西安 710049
  2.中航光电科技股份有限公司，河南洛阳 471000
  3.氟氮化工新材料全国重点实验室，陕西西安 710049
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20260629
  CLC： TQ 028.8
- Received：07 May 2026，
  
  Revised：2026-07-31，
  
  Accepted：04 August 2026，
- 稿件说明：
移动端阅览
FENG Yali, JIANG Zhuye, HU Chengyu, et al. Study on flow boiling heat transfer mechanism of R134a in microchannels with high-aspect-ratio[J/OL]. CIESC Journal, 2026.
DOI：

FENG Yali, JIANG Zhuye, HU Chengyu, et al. Study on flow boiling heat transfer mechanism of R134a in microchannels with high-aspect-ratio[J/OL]. CIESC Journal, 2026. DOI： 10.11949/0438-1157.20260629.

摘要

微通道流动沸腾传热是高功率、大面积芯片散热的有效技术途径。当前研究多聚焦于高质量通量工况，对低质量通量下、大深宽比微通道的研究相对较少。本文以R134a为工质，研究了质量通量（＜100 kg·m

-2

·s

-1

）及深宽比对微通道传热性能、两相压降及流型演变的影响。结果表明，深宽比及质量通量均对两相流型和传热性能有显著影响。在低质量通量下，深宽比为15的微通道（FG-15）传热系数最高（HTC: 15.4 kW·m

-2

·K

-1

）。在中高质量通量下，FG-5综合散热性能最优，其峰值HTC较FG-15提高11.6％，最大散热功率1543 W，热源温度仅71.4℃，且压降较FG-3降低30.6％。可视化观测表明，在给定热通量下，FG-15更易趋向环状流，HTC最高，但高热流下易发生局部干涸，导致临界热通量（CHF）最低；FG-5呈现典型弹状流；FG-3以离散泡状流为主，液相占比大，CHF最高但HTC最低。该现象解释了FG-5在中高热通量下的传热优势。本研究揭示了质量通量和几何结构对微通道流动沸腾性能的综合影响，为微通道散热器的优化设计提供了实验指导。

Abstract

Microchannel flow boiling heat transfer is an effective technical approach for heat dissipation of high-power

large-area chips. Current research mainly focuses on high mass flux conditions

while studies on microchannels with high-aspect-ratios under low mass flux conditions are relatively limited. In this paper

using R134a as the working fluid

the effects of mass flux (

100 kg·m

-2

·s

-1

) and aspect ratio on the boiling heat transfer performance

two-phase pressure drop

and flow pattern evolution of a copper-based microchannel heat sink are systema

tically investigated. The results show that both aspect ratio and mass flux significantly influence the two-phase flow pattern and heat transfer performance. Under low mass flux conditions

the microchannel with an aspect ratio of 15 (FG-15) achieves the highest HTC (15.4 kW·m

-2

·K

-1

). Under medium and high mass flux conditions

the FG-5 exhibits the best overall heat dissipation performance

with a peak HTC 11.6% higher than that of FG-15

a maximum heat dissipation power of 1543 W

a heat source temperature of only 71.4 °C

and a pressure drop reduction of 30.6% compared to FG-3. Visualization observations indicate that at a given heat flux

FG-15 tends toward annular flow

achieving the highest HTC but being prone to local dryout at high heat flux

resulting in the lowest critical heat flux (CHF). FG-5 exhibits typical slug flow

while FG-3 remains dominated by discrete bubbly flow with a large liquid fraction

yielding the highest CHF but the lowest HTC. These observations explain the heat transfer advantage of FG-5 under medium-to-high heat flux conditions. This study reveals the combined effects of mass flux and geometry on microchannel flow boiling performance

providing experimental guidance for the optimal design of microchannel heat sinks.

关键词

Keywords

references

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