Abstract
In this study, a transient analysis of the performance of a heat pipe with a wick
structure is performed. A complete formulation of the equation governing the operation
of a heat pipe during transient conditions are presented and discussed. For the
vapor flow, the conventional Navier-Stokes equations are used. For the liquid flow
in the wick structure, which is modeled as a porous media, volume averaged
Navier-Stokes equations are adopted. The energy equation is solved for the solid
wall and wick structure of the heat pipe. The energy and momentum equations are
coupled through the heat flux at the liquid-vapor interface that defines the suction
and blowing velocities for the liquid and vapor flow. The evolution of the vaporliquid
interface temperature is coupled through the heat flux at this interface that defines the mass flux to the vapor and the new saturation conditions to maintain a fully saturated vapor at all time. A control volume approach is used in the development of the numerical scheme. A parametric study is conducted to study the effect of different parameters that affect the thermal performance of the heat pipe. And experimental setup is developed and numerical res ults are validated with experimental data. The results of this study will be useful for the heat pipe design and implementation in processes that are essentially transient.