Prof. Guihua Tang, Recent Development in Predicting Thermal Transport in Nano-Porous Insulation Materials
Date: Wed 26 Feb 2014, 13:30 - 14:30
Location: Nanoforce Seminar Room (Joseph Priestley Building)
Aerogel is a typical nano-porous material, with a three-dimensional network of backbone composed of interconnected solid nano-particles, which is able to suppress heat transfer through gas filled in the porous and solid backbone and radiation as well, resulting in excellent thermal insulation performance. Firstly, we present a modified model based on the pore size distribution to predict the gaseous thermal conductivity. The predictions are significantly improved compared with those by existing models. Secondly, we present a model to predict the phonon mean free path and effective thermal conductivity of the aerogel solid backbone and also discuss the size effect and interfacial resistance. Thirdly, a Monte Carlo Ray Tracing method is developed to determine the radiative properties of nano-porous media. The simulations are conducted in three dimensional skeleton structure of nano-porous media made up of randomly packing of equal sized spheres, and the absorption and scattering coefficients of the sphere are calculated by Rayleigh-scattering. In addition, the thermal conductivity of silica aerogels doped with carbon black is investigated to reduce radiative heat transfer at high temperature.
Brief introduction to the speaker
Guihua Tang (GH Tang) is a Professor, Deputy Head of the Department of Thermo-Fluid Science and Engineering in the School of Energy and Power Engineering at Xi’an Jiaotong University, China. He worked as a Higher Scientific Officer in the UK STFC Daresbury Laboratory from April 2007 to August 2009. He also worked as a visiting scholar at University of Strathclyde March-August 2008. He is presently a visiting scholar at University of Strathclyde (January-February 2014) jointly funded by NSFC-RSE. His main research covers thermal transport in nanoscale porous materials, non-Newtonian liquid flow and non-equilibrium gas flow in microchannels and micro-porous media, and the lattice Boltzmann method. He has published over 50 peer-reviewed journal papers and authorised three China Invention Patents. He was invited to organize six international conference sessions or mini-symposiums. He was also on the organizing committee of three international conferences. He has delivered four invited keynote lectures in international conferences. He is an Editorial Board member of four international Journals and serves as reviewer for more than 50 international journals. Currently, he is the PI for several major research projects on fluid flow and heat transfer funded by the National Natural Science Foundation of China (NSFC) and National Basic Research Program of China (973 Program).