МАТЕМАТИЧНА МОДЕЛЬ І МЕТОД РОЗРАХУНКУ ДИНАМІКИ ТЕПЛОМАСООБМІНУ В ЗОНІ КОНДЕНСАЦІЇ ТЕПЛОВОЇ ТРУБИ.

Н. М., Сорокова; К. О., Половинкін

A mathematical model and a numerical method for calculating heat transfer dynamics in the condensation zone of a cylindrical heat pipe with a metal-fibrous capillary-porous structure have been developed. The capillary structure - the wick - ensures recirculation of the working medium from the condensation zone to the evaporation zone, regardless of the orientation of the heat pipe in space. The mathematical model describes the coupled problem of heat and mass transfer and phase transformations in the capillary-porous layer in contact with the moist saturated steam of the working body of the pipe, and thermal conductivity in the pipe wall, from the outer surface of which the heat of steam condensation is transferred to the cooling coolant. The content of inert gases in the heat pipe is negligibly small. The system of differential equations is written for a two-dimensional computational domain. It includes the energy transfer, vapor mass, and liquid mass equations written for the capillary-porous bed, and the heat conduction equation for the metal pipe wall. The system of equations is closed by formulas for the intensity of phase transformations, diffusion coefficients of liquid and vapor phases, saturation pressure, and capillary pressure, under the action of which condensate is removed to the evaporation zone. The results of numerical experiments testify to the adequacy of the mathematical model, the effectiveness of the calculation method, and the possibility of their application for managing heat removal processes to organize effective thermal stabilization of thermally stressed surfaces during the operation of heat pipes, and also at the stage of their design.

HEAT transfer; ENERGY transfer; PHASE transitions; HEAT conduction; MASS transfer; HEAT pipes

Scientific Works, 2024, Vol 87, Issue 1, p63

2073-8730

Academic Journal

10.15673/swonaft.v88i1.2962