Abstract
Heat pipe is device working with phase changes of working fluid inside hermetically closed pipe at specific pressure. The phase changes of working fluid from fluid to vapour and vice versa help heat pipe to transport high heat flux. The article deal about gravity heat pipe construction and processes casing inside during heat pipe operation. Experiment working fluid flow visualization is performed with two glass heat pipes with different inner diameter (13 mm and 22 mm) and filled with water. The working fluid flow visualization explains the phenomena as a working fluid boiling, nucleation of bubbles, and vapour condensation on the wall, vapour and condensate flow interaction, flow down condensate film thickness on the wall occurred during the heat pipe operation.
Highlights
IntroductionThe thermosyphon (gravity heat pipe) is shown in figure 1
The thermosyphon is shown in figure 1
The working fluid flow visualization explains the phenomena as a working fluid boiling, nucleation of bubbles, and vapour condensation on the wall, vapour and condensate flow interaction, flow down condensate film thickness on the wall occurred during the heat pipe operation
Summary
The thermosyphon (gravity heat pipe) is shown in figure 1. The lower end of the pipe is heated, this cause that the vapour flows from the bottom to the condensation section where it is cooled and condensed into liquid. Liquid plugs may form at high heat input. This entire cycle repeats in heat pipe again and again. The Thermosyphon works on both conduction and convection mechanism. Since the latent heat of evaporation is large, considerable quantities of heat can be transported with a very small temperature difference from end to end. The amount of heat that can be transported by these systems is normally several orders of magnitude greater than pure conduction through a solid metal [3]
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