低温恒温器高速旋转条件下强质量力对毛细管-多孔涂层氮沸腾传热的强化

IF 1.3 4区 工程技术 Q3 ENGINEERING, MECHANICAL
V. E. Zhukov, N. N. Mezentseva, A. N. Pavlenko
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引用次数: 0

摘要

本文介绍了增材制造修饰的平面矩形(\(16 \times 24\) mm2)传热表面(HS)在强质量力场条件下传热效率的实验研究结果。在传热单元的黄铜底座上3D打印了一层由平均直径为35 \(\mu\) m的球形青铜颗粒组成的多孔正弦形状涂层。涂层深度为150 \(\mu\) m,脊部为300 \(\mu\) m。在离心加速度高达4090 g的液氮条件下,对未改性HS和改性HS进行了对比实验研究。在热流密度为\(4 \cdot 10^{4}{-}8.9\cdot 10^{5}\) W/m2的范围内对传热进行了研究。结果表明,在热流密度\(80,000<q< 320,000\) W/m2范围内,质量力场强度的增加会导致从沸腾状态向单相对流状态过渡时传热系数增大4倍。在沸腾发达区域,对于给定过载所对应的热流密度范围,传热系数归一化为这些条件下根据Borishansky关系式计算的传热系数值,随着离心过载的增加而减小。相对换热系数与过载的关系接近于\(\alpha_{\rm s}/\alpha_{\rm sB} \sim \eta^{-1/6}\)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Enhancement of Heat Transfer during Nitrogen Boiling on Capillary-Porous Coatings under Conditions of Intense Mass Forces at High-Speed Rotation of Cryostat

Enhancement of Heat Transfer during Nitrogen Boiling on Capillary-Porous Coatings under Conditions of Intense Mass Forces at High-Speed Rotation of Cryostat

This article presents the results of experimental studies of the efficiency of heat transfer under conditions of intense fields of mass forces on a flat rectangular (\(16 \times 24\) mm2) heat-transfer surface (HS) modified by additive manufacturing. A porous sinusoidal-form coating consisting of spherical bronze granules of average diameter of 35 \(\mu\)m was 3D printed on the brass base of the heat-transfer unit. The thickness of the coating was 150 \(\mu\)m in the deepenings and 300 \(\mu\)m on the ridges. Comparative experimental studies were carried out on an unmodified HS and modified HS in liquid nitrogen under conditions of centrifugal accelerations of up to 4090 g. The heat transfer was studied in the range of heat flux densities of \(4 \cdot 10^{4}{-}8.9\cdot 10^{5}\) W/m2. It has been shown that in the range of heat flux densities of \(80,000<q< 320,000\) W/m2, increase in the intensity of the mass force fields leads to growth in the heat transfer coefficient up to 4 times at transition from the developed boiling regime to the single-phase convection regime. In the region of developed boiling, for the heat flux density range corresponding to a given overload, the heat transfer coefficient normalized to the value of the heat transfer coefficient calculated as per the Borishansky relation for these conditions decreases with increasing centrifugal overload. The dependence of the relative heat transfer coefficient on the overload is close to the ratio \(\alpha_{\rm s}/\alpha_{\rm sB} \sim \eta^{-1/6}\).

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来源期刊
Journal of Engineering Thermophysics
Journal of Engineering Thermophysics THERMODYNAMICS-ENGINEERING, MECHANICAL
CiteScore
2.30
自引率
12.50%
发文量
0
审稿时长
3 months
期刊介绍: Journal of Engineering Thermophysics is an international peer reviewed journal that publishes original articles. The journal welcomes original articles on thermophysics from all countries in the English language. The journal focuses on experimental work, theory, analysis, and computational studies for better understanding of engineering and environmental aspects of thermophysics. The editorial board encourages the authors to submit papers with emphasis on new scientific aspects in experimental and visualization techniques, mathematical models of thermophysical process, energy, and environmental applications. Journal of Engineering Thermophysics covers all subject matter related to thermophysics, including heat and mass transfer, multiphase flow, conduction, radiation, combustion, thermo-gas dynamics, rarefied gas flow, environmental protection in power engineering, and many others.
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