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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
Employment of a Computational Modeling for Simulation of Convection Heat Transfer with Nucleate Pool Boiling
Submission Author:
Gabryell Freire , RS
Co-Authors:
Gabryell Freire, Liércio Isoldi, Luiz Alberto Oliveira Rocha, Cícero Escobar, Elizaldo dos Santos
Presenter: Elizaldo dos Santos
doi://10.26678/ABCM.ENCIT2020.CIT20-0730
Abstract
In this work, a numerical study of heat transfer with phase change is presented. This process occurs in several technologies in the refrigeration sector, e.g. in condensers and evaporators heat exchangers. In operation, this equipment has internal and external flows with thermal exchange and the occurrence of boiling and/or condensation. In this sense, this work aims to develop a model that allows the study of heat transfer in boiling flows for future analysis on devices design framework. The Volume Of Fluid (VOF) method and Lee's evaporation–condensation model were used to estimate volumetric fractions and to calculate interfacial mass transfer, respectively. The conservation equations of mass, momentum and energy, in addition to the transport equation of the volume fraction, were solved using the Finite Volume Method (MVF), more precisely with the ANSYS–FLUENT software. The model was validated with a correlation of the reference case of nucleated boiling in a pool. The results of the numerical simulation showed good agreement with the one obtained by correlation. The comparison of heat flux between correlation and simulation led to differences lower than 5%. Results of volume fraction and velocity fields also demonstrated that the model was able to predict qualitatively the fluid flow behavior, predicting adequately the bubbles formation and their growth along the domain.
Keywords
Numerical Modeling, Heat Convection, phase change, pool boiling, Turbulent flow
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