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Enhancing thermal performance of a heat-pipe module for air-cooled servers using self-rewetting fluids

delete2026-07-24
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OA
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Ya-Lin Hsiao
C
Chen-li Sun *
DOI:10.1016/j.csite.2026.108377delete
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Abstract

Abstract

En 中文
This study experimentally investigates the performance of an air-cooled thermal module consisting of a fin stack integrated with six heat pipes charged with various self-rewetting fluids (SRWFs) for CPU cooling. Results show that thermal performance is strongly dependent on working fluid composition. Among the tested fluids, the 4 wt% 2-butanol solution delivers the most significant enhancement at high heat loads, achieving an optimal operating capacity of 500-550 W. This capacity is substantially higher than that inferred from single-pipe tests, despite the less favorable condenser boundary conditions in the air-cooled module. The improvement suggests an effective module-level enhancement, likely associated with heat sharing among multiple heat pipes and extended activation of inverse Marangoni convection. Dilute long-chain alcohol solutions (heptanol and octanol) reduce case temperature by up to 5.6°C at moderate heat loads but provide limited extension of the optimal operating capacity.
Keywords:
Inverse marangoni effect
Self-rewetting fluids (SRWFs)
Heat-pipe module
Server cooling
Thermal management
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Journal

Case Studies in Thermal Engineering cover
Case Studies in Thermal Engineering
IF:
6.4
Papers:
8.0K
Citations:
2.6W

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national taiwan university
Scholars:
5.8K
Papers: 2.3K
Citations: 0
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