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Mathematical Modeling and Analysis of Heat Pipe Start-Up From the Frozen State
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1990
Year
EngineeringHeat Pipe Start-upOuter WallHeat PipeConvective Heat TransferRefrigerationHeat Transfer ProcessModeling And SimulationThermal ModelingThermodynamicsFrozen StateMathematical ModelingHeat TransferMultiphase FlowHeat ExchangerFrozen Heat PipeThermal ManagementStart-up ProcessThermal Engineering
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.