Heat pipes: Theory and prediction

The problem of the heat pipe performance theory can be formulated by determining the heat flux transported via the heat pipe and the resulting temperature distribution along its surface, the conditions of heat supply and removal in both the evaporator and condenser being prescribed. Assuming turbulent vapor flow a mathematical model for a steady problem of heat pipe prediction was established considering all dominant processes in both the heat pipe envelope and cavity. Using this model it is possible to calculate the maximum heat flux transported via the heat pipe. Some calculation results for a sodium heat pipe 0.5 m long and with an artery radius of 1 cm are presented varying the operating temperature conditions.