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Thermodynamic optimization of solar receivers : analysis of entropy generation rates in anisothermal flows subjected to asymmetric thermal boundary conditions

Abstract : This thesis work is part of research aimed at improving the performance of concentrated solar power plant receivers with large temperature gradients and asymmetric thermal boundary conditions. It is necessary to analyze the power lost due to thermal and viscous irreversibility: this is achieved by studying the entropy generation rate within the flow and by adopting three different axis of analysis that provide complementary insights: (1) the detailed study of the entropy generation rate in a laminar boundary layer by examining in particular the effect of the thermal boundary condition type (imposed temperature vs. fixed heat flux density) (2) the use of the calculus of variations to determine which velocity fields optimize an objective functional related to the entropy generation rate in a flat plate channel flow, one-third of one of the walls being at imposed heat flux density (3) the study of the entropy generation rate in a flat plate channel flow, turbulent, quasi-compressible and for a fluid which thermo-physical properties depend on temperature.
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Jean-Marc Avellaneda. Thermodynamic optimization of solar receivers : analysis of entropy generation rates in anisothermal flows subjected to asymmetric thermal boundary conditions. Thermics [physics.class-ph]. Université de Perpignan, 2019. English. ⟨NNT : 2019PERP0035⟩. ⟨tel-02502538⟩

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