Prof. Gangtao Liang
Dalian University of Technology, China
Title: Pool Boiling Heat Transfer on Hierarchical Micro-Pillar Surfaces
Abstract:
Boiling heat transfer is becoming
an essential way to dissipate a large amount of heat in aerospace engineering
as it can utilize liquid-vapor phase change latent heat. In this study, pool boiling on two-tier
hierarchical structured surface is investigated with three-dimensional LB
method. Two-tier pillar structures with
different scales are designed, termed as primary and secondary pillar,
respectively. On the hierarchical
surface with upward-orientation secondary pillars, the bubble departure is
promoted. And, the heat transfer can be
improved by increasing the primary pillar spacing and enhancing surface wettability. Increasing the height of secondary pillar is
favorable for enhancing capillary wicking, but can also bring greater flow
resistance. On the hierarchical surface
with lateral-orientation secondary pillars, the heat transfer is limited by the
large flow resistance. With the
enlargement of primary pillar spacing, the impact brought by flow resistance is
moderated, and the heat flux can be enhanced.
Finally, the boiling performance regarding the effect of wall
temperature is concerned, where the structured surface with upward-orientation
secondary pillars shows the better boiling performance than other structured
surfaces.
Biography:
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 full Professor in 2022 because of his outstanding work in the areas of heat transfer and fluid mechanics. His primary research interests are liquid/vapor phase-change heat transfer and fluid flow, covering evaporation, boiling and condensation in nano-, micro- and macro-scale. He has published over 100 papers, including more than 70 archival journal papers in Int. J. Heat Mass Transfer, Int. J. Multiphase Flow, Appl. Therm. Eng., and Ind. Eng. Chem. Res, etc. He is currently a member of American Society of Mechanical Engineers (ASME), a member of World Society of Sustainable Energy Technologies (WSSET), 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.