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A heat transfer model for liquid film boiling on micro-structured surfaces

National Science Review 2024年第5期11卷 352-364页

作者： Pengkun Li Qifan Zou Xiuliang Liu Ronggui Yang School of Energy and Power Engineering Huazhong University of Science and Technology State Key Laboratory of Coal Combustion Huazhong University of Science and Technology

High heat transfer coefficient(HTC) and critical heat flux(CHF) are achieved in liquid film boiling by coupling vibrant vapor bubbles with a capillary liquid film, which has thus received increased interest for thermal management of high-power electronics. Although some experimental progress has been made, a high-fidelity heat transfer model for liquid film boiling is lacking. This work develops a thermal-hydrodynamic model by considering both evaporation atop the wick and nucleate boiling inside the wick to simultaneously predict the HTC and CHF. Nucleate boiling is modeled with microlayer evaporation theory, where a unified scaling factor is defined to characterize the change of microlayer area with heat flux. The scaling factor η is found to be independent of wicking structure and can be determined from a few measurements. This makes our model universal to predict the liquid film boiling heat transfer for various micro-structured surfaces including micropillar, micropowder, and micromesh. This work not only sheds light on understanding fundamental mechanisms of phase-change heat transfer, but also provides a tool for designing micro-structured surfaces in thermal management.

关键词： liquid film boiling heat transfer model critical heat flux heat transfer coefficient thermal management

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Record-high heat transfer performance of spray cooling on 3D-printed hierarchical micro/nano-structured surface

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Science Bulletin 2025年第2期70卷 223-231页

作者： Yongyan Hu Yifan Lei Xiuliang Liu Ronggui Yang School of Energy and Power Engineering Huazhong University of Science and TechnologyWuhan 430074China College of Engineering Peking UniversityBeijing 100871China

Managing high-flux waste heat with controllable device working temperature is becoming challenging and critical for the artificial intelligence,communications,electric vehicles,defense and aerospace *** cooling,which combines forced convection with phase-change latent heat of working fluids,is promising for high flux heat *** of the previous studies on spray cooling enhancement adopted high spray flow rates to strengthen forced convection for high critical heat flux(CHF),leading to a low heat transfer coefficient(HTC).Micro/nanostructured surfaces can enhance boiling,but bubbles inside the structures tend to form a vapor blanket,which can deteriorate heat *** work demonstrates simultaneous enhancement of CHF and HTC in spray cooling by improving both evaporation and liquid film boiling on three-dimensional(3D)ordered hierarchical micro/nano-structured *** hierarchical micro/nano-structured surface is designed to coordinate the transport of spray droplets,capillary liquid films,and boiling bubbles to enhance spray cooling *** inversion where superheat decreases with increasing heat flux is observed,leading to an ultra-high HTC due to the simultaneous promotion of bubble nucleation and *** CHF is obtained by overcoming the liquid–vapor counterflow,i.e.,synergistically facilitating bubble escape and liquid permeation.A record-breaking heat transfer performance of spray cooling is achieved with a maximum heat flux of1273 W/cm^(2)and an HTC of 443.7 kW/(m^(2)K)over a 1 cm^(2)heating area.?2024 Science China *** by Elsevier *** Science China *** rights are reserved,including those for text and data mining,AI training,and similar technologies.

关键词： Spray cooling liquid film boiling liquid film evaporation Hierarchical structure Thermal management

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