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Effects of employing various PCM layers with different thicknesses on the heat transfer features within an annulus tube heat exchanger

报告时间:430日,900-1100.

报告地点:土建楼520

Dr. Suvash C. Saha

School of Mechanical and Mechatronic Engineering

University of Technology, Sydney

Office: CB11.09.203

PO Box 123, Broadway

NSW  2007 Australia

Abstract:

The use of latent heat storage materials containing phase change materials (PCMs) is an effective way of buffering thermal fluctuations and has the advantages of high-energy storage density and the isothermal nature of the storage process. The aim of this study is to develop novel heat management materials based on the enclosed PCMs for different applications of interest in mechanical engineering. In this study, solidification and melting processes of different types of PCMs employed in a multi-layer annulus with various thicknesses are numerically investigated. In order to solve the governing equations in which the natural convection heat transfer is also considered, a two-dimensional finite element (and also finite volume) method is applied. Different thermal boundary conditions are used to simulate the heat charging in different walls of the heat exchanger. Up to five layers in the same annulus are considered in order to put various PCMs with different possible arrangements and thicknesses. Simulation results are presented in the forms of liquid fraction, average temperature and their contours over the three periods of inner boundary oscillation. The computational results show that using more layers of different PCMs leads to fluctuation of liquid fraction and average temperature of layers with wider amplitude. For lower thicknesses of the outer layer, the system response to the employed boundary conditions will be rather in latent mode.  

Bio:

Dr. Suvash C. Saha is working at the University of Technology Sydney, Sydney, Australia as a Senior Lecturer of Mechanical Engineering. He received his PhD in Computational Fluid Dynamics from the School of Engineering and Physical Sciences of James Cook University, Australia in 2009. He also received his BSc (Honours) in Mathematics and MSc in Applied Mathematics with thesis group from the Department of Mathematics, University of Dhaka. His current research interests are: Computational biomechanical engineering; Solar thermal energy technology; Natural convection heat transfer in buildings and other confined geometries; Scale analysis for the transient flow etc.

     Dr. Saha has more than 160 publications including 102 journal papers mostly published in high impact journals. Total citations of Dr. Saha is 1277 (Google Scholar) and 852 (Scopus) with h-Index of 19 (Google Scholar) and 16 (Scopus). He has more than $1.2m funding including 2 ARC Linkage grants and is involved in two National Natural Science Foundation of China (NSFC) funding.


发布人:聂冰川(力学系)