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ISSN Online: 2688-7231

ISBN Online: 978-1-56700-524-0

Proceedings of the 26thNational and 4th International ISHMT-ASTFE Heat and Mass Transfer Conference December 17-20, 2021, IIT Madras, Chennai-600036, Tamil Nadu, India
December, 17-20, 2021, IIT Madras, Chennai, India

A Numerical Investigation of Charging a High-Temperature Latent Heat Storage Unit : A Variable Domain Methodology

Get access DOI: 10.1615/IHMTC-2021.1140
pages 761-767

Abstract

This study analyses thermodynamically consistent melting behaviour of a high-temperature phase change medium (PCM), (sodium nitrate, NaNO3) using variable domain methodology. A rectangular cavity of aspect ratio (AR) one containing NaNO3 is treated as latent heat storage unit (LHSU). A two-dimensional analysis enables examining the influence of combined convection and diffusion during charging of domain. The present model simultaneously considers the more accurate variable domain numerical formulation, automatic remeshing and buoyancy driven natural convection to observe the phase change phenomenon. A sharp melting interface is reproduced for pure NaNO3 using the present methodology which is virtually impossible to achieve in fixed domain method. Temporal evolution of the sharp melting front is represented inside the rectangular domain having Prandtl no. (Pr) = 7.42 and Rayleigh no. (Ra) = 1.1×108. Moreover, temporal temperature distribution in both phases, velocity distribution in liquid phase, shape, position and velocity of moving interface are evaluated and represented using COMSOL Multiphysics. The thermodynamic consistency of the results is verified by performing Stefan's heat balance at the moving interface.
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