 A secondary wick hydraulically links the reservoir and the primary wick.Loop heat pipes overcome some of the shortcomings of conventional heat pipes, which while being excellent heat transfer devices are mainly confined to transferring relatively small heat loads over relatively short distances when the evaporator and condenser are at same horizontal level.This limitation on the part of heat pipes is mainly related to the major pressure losses associated with the liquid flow through the porous structure, present along the entire length of the heat pipe, and viscous interaction between the vapor and liquid phases, also called entrainment losses.