利用熔融沉积模型 (FDM) 印刷坑柱 (Pi2) 阵列增强相变传热

IF 2.8 2区 工程技术 Q2 ENGINEERING, MECHANICAL Experimental Thermal and Fluid Science Pub Date : 2024-10-21 DOI:10.1016/j.expthermflusci.2024.111337
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引用次数: 0

摘要

相变传热在热管理系统中至关重要,通过优化表面结构可显著增强相变传热。本研究利用精心设计的支柱和凹坑几何形状的三维打印结构来研究如何增强池沸腾传热。我们提出了一种新颖的方法,将双升模型与独立的液体-蒸汽通道相结合,以提高临界热通量(CHF)和传热系数(HTC)。我们使用注入铜的聚乳酸(PLA)细丝,创建并烧结了结构化表面,这些表面具有凹坑辅助成核点、用于蒸汽逸出的柱间间距以及用于增强液体供应的柱状粗糙度。在常压下使用去离子水和乙醇进行的实验表明,与普通表面相比,结构表面有了显著改善:水的 CHF 值提高了 87%,最大 HTC 值提高了 39%,而乙醇的 CHF 值和 HTC 值则分别提高了 122% 和 61%。这些改进归功于优化的表面几何形状和分离的液体-蒸汽通路的协同效应,减少了逆流阻力,提高了流体力学稳定性。基于双升模型的理论框架解释了这些改进,为沸腾传热中的毛细作用和半毛细作用耦合效应提供了见解。该研究引入了 CHF 和 HTC 增强的预测模型,为未来从电子冷却到发电厂热管理和先进热交换器等应用领域的设计优化提供了宝贵的工具。
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Enhanced Phase Change Heat Transfer with Fused Deposition Modeling (FDM) Printed Pit and Pillar (Pi2) Arrays
Phase change heat transfer, crucial in thermal management systems, can be significantly enhanced through optimized surface structures. This study investigates pool boiling heat transfer enhancement using 3D printed structures with carefully designed pillar and pit geometries. We present a novel approach combining the Dual Rise model with separate liquid–vapor pathways to improve Critical Heat Flux (CHF) and Heat Transfer Coefficients (HTC). Using copper-infused Polylactic Acid (PLA) filaments, we created and sintered structured surfaces featuring pit-assisted nucleation sites, interpillar spacing for vapor escape, and pillar roughness for enhanced liquid supply. Experiments with deionized water and ethanol under atmospheric pressure demonstrated substantial improvements over plain surfaces: water showed an 87% increase in CHF and 39% in maximum HTC, while ethanol exhibited even greater enhancements of 122% in CHF and 61% in HTC. These improvements are attributed to the synergistic effects of optimized surface geometry and separated liquid–vapor pathways, reducing counterflow resistance and improving hydrodynamic stability. A theoretical framework based on the Dual Rise model explains these enhancements, providing insights into coupled capillary action and hemiwicking effects in boiling heat transfer. The study introduces predictive models for CHF and HTC enhancement, offering valuable tools for future design optimization in applications ranging from electronics cooling to power plant thermal management and advanced heat exchangers.
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来源期刊
Experimental Thermal and Fluid Science
Experimental Thermal and Fluid Science 工程技术-工程:机械
CiteScore
6.70
自引率
3.10%
发文量
159
审稿时长
34 days
期刊介绍: Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.
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