时间：2018年6月20日周三上午9：30-11：00

地点：土木综合楼东403会议室

报告人：Dr Suvash Saha

题目及摘要：Computational Fluid Dynamics Study: Application to Heat Transfer Through PCM and Solid Gas Flows in porous media

My talk will cover two recent areas of our CFD application studies. One is effects of employing various PCM layers with different thicknesses on the heat transfer features within an annulus tube heat exchanger and other one is solid gas flows in metal foam heat exchanger.   

Phase Change Materials (PCMs) possess the benefit of saving and releasing the thermal energy at a fixed temperature which has made them a useful material in the relevant industrial cases. Measures to examine the heat storage capability of the system will then be advantageous to the overall energy saving. In this study, solidification and melting processes of different types of PCMs employed in a multi-layer annulus with various thicknesses are numerically investigated. Various numerical technique is applied to solve the governing equations in which the natural convection heat transfer is also considered. Simulation results are presented in the forms of liquid fraction, average temperature and their contours. It is found that using more layers of different PCMs leads to fluctuation of liquid fraction and average temperature of layers with wider amplitude.

Heat exchangers are prevalent in a number of industries such as Heating, Ventilation, Air-conditioning, Refrigeration systems (HVAC&R), power generation, electronics, chemical, automotive, among others. The global heat exchanger market is expected to reach USD $78 billion by 2020 while being cognizant of the fact that conservative studies enunciate that heat exchanger fouling incurs about 0.25 % of the gross domestic product (GDP) of industrialized nations. A coupled finite volume-discrete element (FVM-DEM) numerical method is developed to investigate oscillating multiphase foulant-laden air (solid-gas) flow and particulate fouling in a porous heat exchanger channel comprising an array of circular cylinders. The fouling characteristics and pressure drop is reported for different flow conditions.

Biography

Dr. Suvash C. Saha is working at UTS as a Senior Lecture since 2017. 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. He received his PhD in Computational Fluid Dynamics from the School of Engineering and Physical Sciences of James Cook University in 2009. He received his BSc in Mathematics and MSc in Applied Mathematics with thesis group from the Department of Mathematics, University of Dhaka, Bangladesh. After obtaining his degree, Dr. Saha joined at IBAIS University, Bangladesh as a lecturer of Mathematics. He has more than 100 publications including more than 70 journal papers, 6 book chapters and 40 conference papers.

发布人：徐丰（力学系）