Journal of Heat Transfer · 1990 · 80 citations · 0 references
EngineeringChemical EngineeringMechanical EngineeringHeat TransferThermodynamicsTransport PhenomenaCondensationHeat Transfer AnalysisHeat Transfer ModelingThermal Boundary LayersTransient Flow AnalysisTransient Heat TransferBoundary Condition SpecificationBoundary SpecificationHeat PipesNumerical Simulation Of Transient FlowPipeline Start-up TransientsThermal Transient AnalysisTransient CondensationTransient Heat Transfer Modeling
The start-up process of a frozen heat pipe is described and a complete mathematical model for the start-up of the frozen heat pipe is developed based on the existing experimental data. The model is simplified and solved numerically. The two-dimensional transient model for the wall and wick is coupled with the one-dimensional transient model for the vapor flow when vaporization and condensation occur at the interface. A parametric study is performed to examine the effect of the boundary specification at the surface of the outer wall on the successful start-up from the frozen state. For successful start-up, the boundary specification at the outer wall surface must melt the working substance in the condenser before dryout takes place in the evaporator.