Numerical thermodynamic analysis of heat storage porous duct under pulsating flow using lattice Boltzmann method
by Bayssain Amami; Raja Rabhi; Hacen Dhahri; Abdallah Mhimid
International Journal of Exergy (IJEX), Vol. 22, No. 4, 2017

Abstract: This paper deals with a thermodynamic analysis of sensible heat storage unit built by porous media. Analysis of the system's performances was tested through forced pulsating fluid flow, as thermal enhancement technique. Brinkman-Forchheimer-extended Darcy model is incorporated in momentum equations. Local thermal non-equilibrium (LTNE) between fluid and solid phases is adopted. A thermal Lattice Boltzmann model using three distribution functions has been proposed. Both energetic and exergetic efficiencies are determined for a complete cycle of charging and discharging as function of pulsating amplitude and for different emerging parameters values. It is found that the system's performance can be improved by a proper selection of operational parameters. The system's performances are getting better when increasing pulsating amplitude. With high pulsating intensity flow, the energetic and exergetic efficiencies augment, respectively, ~44% and 32% when porosity increases and 53% and 40% when augmenting Reynolds number and ~21% and 26% as pulsating frequency rises up.

Online publication date: Wed, 26-Apr-2017

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