A Modified Enthalpic Lattice Boltzmann Method for Simulating Conjugate Heat Transfer Problems in Non-Homogeneous Media

Author(s)

Matsuda, Vinicius Akyo ; Martins, Ivan Talao ; Moreira, Debora Carneiro ; Cabezas-Gomez, Luben ; Bandarra Filho, Enio Pedone

• Document type: Journal article
• Source: INVENTIONS; v. 9, n. 3, p. 24-pg., 2024-06-01.

Abstract

In this study, we introduced modifications to a prior existing enthalpic lattice Boltzmann method (LBM) tailored for simulating the conjugate heat transfer phenomena in non-homogeneous media with time-dependent thermal properties. Our approach is based upon the incorporation of the remaining terms of a conservative energy equation, excluding only the terms regarding flow compressibility and viscous dissipation, thereby accounting for the local and transient variations in the thermophysical properties. The solutions of verification tests, comprising assessments of both transient and steady-state solutions, validated the accuracy of the proposed model, further bolstering its reliability for analyzing heat transfer processes. The modified model was then used to perform an analysis on structured cavities under free convection, revealing compelling insights, particularly regarding transient regimes, demonstrating that the structured cavities exhibit a beneficial impact on enhancing the heat transfer processes, hence providing insights for potential design enhancements in heat exchangers. These results demonstrate the potential of our modified enthalpic LBM approach for simulating complex heat transfer phenomena in non-homogeneous media and structured geometries, offering valuable results for heat exchanger engineering and optimization. (AU)

• FAPESP's process: 22/15765-1 - Study of transport phenomena applied to emerging technologies of energy conversion and storage
• Grantee: Luben Cabezas Gómez
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 23/02383-6 - Development of a phase-field lattice Boltzmann method to simulate thermal liquid-gas phase change phenomena for engineering applications
• Grantee: Ivan Talão Martins
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 22/12257-5 - Study of droplets impact onto heated walls using Lattice Boltzmann Method
• Grantee: Vinicius Akyo Matsuda
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)