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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
NUMERICAL ANALYSIS OF AN ALTERNATING CURRENT MHD PUMP WITH RECTANGULAR SECTION FOR ELECTROLYTE SOLUTIONS
Submission Author:
Matheus de Abreu Monteiro Campos , RJ
Co-Authors:
Matheus de Abreu Monteiro Campos, Gabriel Lisbôa Verissimo, Marcelo Colaco
Presenter: Matheus de Abreu Monteiro Campos
doi://10.26678/ABCM.ENCIT2020.CIT20-0324
Abstract
Magnetohydrodynamics (MHD) pumps are the ones that use the Lorentz force, which arises when a conducting fluid is subjected to a magnetic field and an electric current, as a driving force. These pumps are restricted to electrical conducting fluids such as molten salts, liquid metals and electrolyte solutions. When pumping electrolyte solutions under the action of direct currents (DC), electrolysis can be induced causing bubbles formation and accelerated electrodes consumption. These effects, however, can be reduced or eliminated by using alternating currents (AC). In this work, an AC MHD pump for electrolyte solutions is evaluated aiming to study the velocity and pressure fields for different current frequencies. Temperature behaviour is also evaluated during transient simulations. Electromagnetic and fluid dynamic equations are solved, considering the Lorentz force and the Joule heating effect. The ANSYS FLUENT software was used to solve the problem. The electric potential, magnetic field, Lorentz force, and Joule heating effect equations were added in the FLUENT software through User-Defined Functions (UDF) and User-Defined Scalar (UDS). Laminar and turbulence models were compared during verification and the best model was selected to perform the simulation.
Keywords
MHD (Magnetohydrodynamics), Pumps, Numerical simulation, Computational Fluid Mechanics
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