Topology optimization of heat and mass transfer in bi-fluid laminar flow : application to heat exchangers

Abstract : Heat exchangers are devices widely used in various energy systems. The present research work focuses on the design of single-phase bi-fluid heat exchangers by using topology optimization methods. Unlike conventional size and shape optimization methods, topology optimization methods allow greater design freedom and do not require prior definition of the exchanger geometry. Hence, bi-fluid topology optimization consists of freely reorganizing two fluids and one solid in the optimization domain. Both fluids should connect inlet sections to outlet sections while avoiding any fluid mixture inside the domain. SIMP method “Solid Isotropic Material with Penalization” is used within the framework of this thesis. This method includes various algorithms that were formulated and tested : finite volume method was selected for solving the direct physical problem, discrete adjoint method was used for the calculation of the gradient of the objective function, and the method of moving asymptotes was adopted to guide the numerical optimization. Simulation results have allowed the definition of various heat exchanger shapes in 2D. The number of inlet and outlet as well as the flow rates of each fluid have been varied. The works have shown the ability of this method to design innovative shapes of heat exchangers. Hence, the thesis establishes the basis of a new design methodology of heat exchangers.
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Rony Tawk. Topology optimization of heat and mass transfer in bi-fluid laminar flow : application to heat exchangers. Thermics [physics.class-ph]. PSL Research University, 2018. English. ⟨NNT : 2018PSLEM017⟩. ⟨tel-02274990⟩

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