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Study of Lattice Boltzmann Method for modeling flows in microchannels of solar absorvers

Grant number: 18/09041-5
Support type:Scholarships in Brazil - Doctorate (Direct)
Effective date (Start): July 01, 2018
Effective date (End): February 28, 2021
Field of knowledge:Engineering - Mechanical Engineering - Transport Phenomena
Principal Investigator:Luben Cabezas Gómez
Grantee:Luiz Eduardo Czelusniak
Home Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
Associated research grant:16/09509-1 - Phase change heat transfer processes of high performance applied to solar energy recovery, AP.TEM

Abstract

Multiphase flows inside microfluid devices has receiving great attention due to the predictable advantages of the micro scale phenomena, related with enhanced efficiency of heat and mass transfer process, reduced axial dispersion and devices with reduced volume. In order to obtain these benefits, it is recommended a great understanding of the complex behavior of multiphase flow inside these devices (Yu et al., 2007). Microchannels systems with gas-liquid flows has many applications, as the heat exchangers with microchannels for cooling of electronic circuits with and without phase change (Qu e Mudawar, 2002; Kandlikar, 2002; Thome, 2004; Cheng e Wu, 2006; Cheng et al., 2007; e Cheng et al., 2009), and also heat exchangers with microchannels that work as solar absorbers (Oyinlola et al., 2015a, b, c; L'Estrange, 2015; and Drost et al., 2013). In this project, it is proposed to undertake modeling studies using the Lattice Boltzmann (LB) method of pseudopotential, aiming initially a detailed study of the numerical solution procedure and later a comprehension of the transport phenomena that take place in microchannels flows of heat exchangers used as thermal absorbers in power systems with solar energy. The pseudopotential LB method was chosen due to the computational implementation simplicity and to the fact that it does not need the solution of a differential equation to capture the gas-liquid interface movement. The LB method is also appropriate for parallel programing. For microchannel flows the LB method has been used in many works aiming the study of the hydrodynamics phenomena in gas-liquid flows, as bubble formation (Yu et al., 2007; Wu et al., 2008; Wang et al., 2011; Riaud et al., 2013; and Kamali e Van den Akker, 2013); as well as the convective boiling process (Gong e Cheng, 2014). (AU)