Numerical Study of Counterflow Microchannels with Non-Uniform Ribs

Wang Shouyuan Wang Zhiqiang

doi:10.12465/issn.0253-4339.20260203002

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Numerical Study of Counterflow Microchannels with Non-Uniform Ribs

更新时间：2026-06-04

- Numerical Study of Counterflow Microchannels with Non-Uniform Ribs
- Journal of Refrigeration Pages: 1-7(2026)
- 作者机构：
  
  山东大学核科学与能源动力学院济南 250061
- 作者简介：
- 基金信息：
- DOI：10.12465/issn.0253-4339.20260203002
  CLC： TB61⁺1;TB657.5
- Received：03 February 2026，
  
  Revised：2026-02-28，
  
  Accepted：03 April 2026，
  
  Online First：04 June 2026，
- 稿件说明：
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王首元，王志强. 带非均匀肋的逆流微通道的数值研究［J］. 制冷学报，XXXX，XX（XX）：1-7.

Wang Shouyuan，Wang Zhiqiang. Numerical Study of Counterflow Microchannels with Non-Uniform Ribs［J］. Journal of Refrigeration，XXXX，XX（XX）：1-7.
王首元，王志强. 带非均匀肋的逆流微通道的数值研究［J］. 制冷学报，XXXX，XX（XX）：1-7. DOI： 10.12465/issn.0253-4339.20260203002.

Wang Shouyuan，Wang Zhiqiang. Numerical Study of Counterflow Microchannels with Non-Uniform Ribs［J］. Journal of Refrigeration，XXXX，XX（XX）：1-7. DOI： 10.12465/issn.0253-4339.20260203002.

摘要

本文通过CFD数值模拟方法，研究了逆流微通道散热器高温区形成机理，并提出了“出口顶肋结构”和“通道中顶肋结构”。结果表明：边缘通道进口效应和相邻通道的横向传热是导致“平行四边形”高温区的根本原因。“均匀底肋结构”可以整体强化换热，但依然存在“平行四边形”高温区。“出口顶肋结构”针对边缘通道，在其进口区域弱化换热，出口区域强化换热，改变了“平行四边形”高温区形态，使壁面最大温差降低了33.3%。“中顶肋结构”对通道中部高温区强化换热，使壁面最大温差进一步降低58.3%，且在小流量（1.64 g/s）下可以实现“均匀底肋结构”及“出口顶肋结构”大流量（2 g/s）时相同的壁面平均温度，同时使壁面温差降低64.8%和47.2%，压降降低9.1%和12.0%。

Abstract

The formation mechanism of high-temperature zones in counterflow microchannel heat sinks was investigated through computational fluid dynamics numerical simulations. The following two novel structures were proposed： an outlet top-rib structure and a channel center top-rib structure. The results showed that the inlet effect of edge channels and transverse heat transfer between adjacent channels were the identified as fundamental causes of the parallelogram-shaped high-temperature zones. The uniform bottom rib structure enhanced overall heat transfer； however， the parallelogram-shaped high-temperature zones still persisted. For edge channels， the outlet top rib structure weakened heat transfer at the inlet region and strengthened heat transfer at the outlet region， thereby modifying the morphology of the parallelogram-shaped high-temperature zones and decreasing the maximum wall temperature difference by 33.3%. The channel center top rib structure enhanced heat transfer in the high-temperature zones at the channel center， further reducing the maximum wall temperature difference by 58.3%. Furthermore， it achieved the same average wall temperature as the uniform bottom-rib structure at a low flow rate （1.64 g/s） and outlet top-rib structure at a large flow rate （2 g/s）， while reducingwall temperature difference by 64.8% and 47.2%， and pressure drop by 9.1% and 12.0%， respectively.

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