Energies · 2018 · 22 citations · 19 references
EngineeringMechanical EngineeringPhysicsComputational Fluid DynamicsFluid DynamicsHeat TransferCondensation Heat TransferHeat ConductionHeat Transfer In FluidsHeat Transfer ModelingThermal SimulationTransient Heat TransferCfd SimulationEffective Thermal ConductivityThermal ConductivityThermal ResistanceThermo-fluid DynamicsTransient Heat Transfer In FluidsTransient PerformanceTransient Thermal Evolution
The transient thermal performance of phase change and heat and mass transfer in a two-phase closed thermosyphon are studied with computational fluid dynamics (CFD). A CFD model based on the volume of fluid technique is built. Deionized water is specified as the working fluid of this thermosyphon. The CFD model reproduces evaporation and condensation in the thermosyphon at different heating inputs. The average wall temperatures are also analyzed. Variations of average wall temperatures indicate that this thermosyphon reaches a steady state after 19 s, and starts to work in advance when the heating input increases. Moreover, thermal resistance is decreased until a minimum (0.552 K/W) by increasing the heating input, and the effective thermal conductivity is elevated to a maximum (2.07 × 106 W/m∙K).
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