Effect of boundary layer thickness and dimensionless wall distance y+ on numerical simulation of heat pipes

To consider the sway of boundary layer thickness and dimensionless wall distance y+ on the numerical simulation results of the thermo tube, taking the straight thermo tube as an example, using the continuity equation, momentum equation, energy equation, and turbulence model equation as the controlling equations, and adopting the finite volume method for the spatial discretization, the numerical simulation study of the heat pipe is carried out by controlling the changes of boundary layer thickness and dimensionless wall distance y+. Numerical simulation studies show that the boundary layer thickness and y+ have a large effect on the numerical simulation of heat pipes. Reasonably setting these two parameters within a certain range can improve the accuracy of heat pipe numerical calculations, and the results of the study can provide a reference for the security analysis of thermo tube reaction vessels.