Essay On Heat Pipe

The heat pipe is a highly effective passive device for transmitting heat at high rates [1]. It can transfer heat over considerable distances with extremely small temperature drops, that is minimum loss in heat during transfer. A heat pipe has exceptional flexibility and has simple construction with easy control, without the need of external pumping power. The component of conventional heat pipe has been shown in Figure 1. Figure 1: Working principle of heat pipe (copy from Electronics Cooling Magazine)

As shown in the Figure 1, the heat pipe in its simplest configuration is a closed, evacuated cylindrical vessel [2]. Its internal walls are lined with a capillary structure also called a wick. It is saturated with a working fluid. The heat pipe works on the principle of latent heat of evaporation and condensation of fluid at the

Since heat is not conducted through the walls of the heat pipe, there are reduced chances of blockage in the arteries of the heat pipe due to vapour bubbles. Wick is placed along the interior walls so that the condensate travels along the arteries towards the evaporator.

13. INVERTED MINISCUS HEAT PIPE

As shown in Figure 14, evaporation takes place in the dry region of the porous structure at the liquid-vapour interface. The heat is conducted to this interface from the heated surface through the dry region of the porous element, and the vapour flows mainly along the solid surface through this porous region towards the triangular vapour channel. The vapour flows through the capillary. There is a difference in the curvature of the menisci inside the porous structure. [14] Figure 14: Schematic of an inverted meniscus type evaporator with the triangular fin: (a) with low heat fluxes; (b) with high heat fluxes. NON-CONVENTIONAL HEAT