| 个人简介 | |
|---|---|
 Prof. Gangtao Liang Dalian University of Technology, China |
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| 标题： Universal Predicting Methods for Boiling Critical Heat Flux and Heat Transfer on Micro-Pit Surfaces | |
| 摘要： Rapid developments of high-heat-flux devices in aerospace (e.g. spacecraft electronics) have incapacitated the conventional fan-cooled and various single-phase cooling techniques. Instead, two-phase cooling, i.e., boiling, which utilizes liquid/vapor phase-change latent heat in combination with temperature-rise sensible heat, shows its great advantages in tackling these above-mentioned cooling concerns. Critical heat flux (CHF) is arguably the most important design and safety parameter for any heat-flux controlled boiling application. This keynote lecture will review different CHF models and associated mechanisms and parametric trends, as well as universal predicting methods for CHF. Also, pool boiling heat transfer enhancement on the micro-pit surfaces will be reported systematically. Microscale pits fabricated on plain surface are able to reduce boiling incipience superheat, and improve both nucleate boiling heat transfer coefficient and critical heat flux (CHF). Boiling enhancement magnitudes have a weak dependence on the micro-pit diameter, but increase monotonously with decreasing the pit depth. There exists an optimum pit-to-pit spacing for the maximum boiling enhancements, which is virtually identical to bubble departure diameter, and estimated using the capillary length. The major mechanism behind is that this spacing is favorable for alleviating hydrodynamic instabilities induced by the counterflow between liquid inflow and vapor outflow. | |
| 简介： Prof. Liang received his B.Eng. in 2009 and Ph.D. in 2014 from Dalian University of Technology, where he remained as a faculty member. He undertook his postdoctoral research from 2015 to 2017 at Purdue University Boiling and Two-Phase Flow Laboratory (PU-BTPFL), where he was dedicated to experimental investigation and theoretical modeling of two-phase flow and heat transfer. He was appointed to Associate Professor in advance in 2016 because of his outstanding work in the areas of heat transfer and fluid mechanics. His primary research interests are two-phase flow and heat transfer, covering droplets impingement, spray cooling, micro-channel flow boiling and condensation, horizontal-tube falling film evaporation, and boiling enhancement. He has published over 80 papers, including more than 50 archival journal papers in Int. J. Heat Mass Transfer, Int. Commun. Heat Mass Transfer, Exp. Therm. Fluid Sci., Acta Mech., Numer. Heat Transfer, and Ind. Eng. Chem. Res. He has been internationally recognized for his great contributions to the droplets impact research and a series of high-quality review papers for two-phase heat transfer topics. He is currently Advisory Board Member of Heat Transfer Division in Cambridge Scholars Publishing, International Advisory Board Member of Thermal Science Journal, and Editorial Board Member of Fluid Dynamics & Materials Processing. He also serves as an outstanding reviewer for many international journals. | |
