Speaker: Gennady Ziskind
Affiliation: Ben-Gurion University of the Negev
Abstract: This seminar deals with recent developments in modeling and experimentation of solid-liquid phase change processes, with special attention to the geometries commonly encountered in or suggested for the latent-heat thermal energy storage (LHTES) systems, which use phase-change materials (PCM). The processes in these systems are multi-dimensional and complicated, and include phenomena such as convection in the liquid phase, sinking of solid in the liquid, and volume change due to phase change. Thus, their reliable modeling requires significant efforts, whereas experimentation in this field is quite difficult and could lead to results rather different from those characteristic of thermal-storage applications. In this talk, we present results of a multi-year study of double-pipe latent-heat storage units with various fin arrays, common and original, demonstrating theoretically and experimentally novel ways for heat transfer enhancement. It is shown that a so-called close-contact melting (CCM) may be reached in these systems, drastically reducing the melting time. Analytical modeling, which attempts to preserve main features of the process, reveals its governing dimensionless parameters, including the Fourier, Stefan, Archimedes and Prandtl numbers, along with additional groups representing the unit geometry. More general in-house numerical modeling is performed, as well, and its results are successfully generalized.
Biosketch: Dr. Gennady Ziskind earned his M.Sc. and D.Sc. degrees from the Faculty of Mechanical Engineering at the Technion–Israel Institute of Technology. At present, he is Professor and Head of Heat Transfer Laboratory, Department of Mechanical Engineering, Ben-Gurion University of the Negev. His research focuses on various aspects of heat and mass transfer and multiphase systems, including phase-change energy storage and thermal management. He has co-authored about 60 journal articles and about 100 conference papers. Dr. Ziskind serves as an Associate Editor of ASME Journal of Heat Transfer, a delegate to the Assembly of International Heat Transfer Conferences, and a member of ASME Safety Standards Committee for Thermal Energy Storage (TES) Systems. He co-chaired Eurotherm Seminar 99: Advances in Thermal Energy Storage in Spain in 2014 and organized INNOSTORAGE–Advances in Thermal Energy Storage International Conference in Israel in 2016.
Date(s) - Apr 07, 2017
12:00 pm - 1:00 pm