Gravity heat pipe with annular element

Abstract

The invention relates to a novel efficient heat exchanger gravity heat pipe, in particular to a gravity heat pipe for thinning a condensation film by changing a pipe wall structure, and belongs to the technical field of heat exchange. The gravity heat pipe is composed of three zones including an evaporation section, a heat preservation section and a condensation section. When a gravity heat pipe works, a working medium is heated to evaporate to reach the condensation section to form a thick liquid film on the wall face, thermal resistance is increased, and heat transfer is blocked. According to the novel efficient heat exchanger gravity heat pipe, the annular elements are additionally arranged in the pipe, the wall face structure is changed, and therefore the liquid film is thinned. The annular elements are additionally arranged in the evaporation section, and therefore the liquid film of the evaporation section is evenly distributed, and falling film evaporation is achieved; the annular elements are additionally arranged in the condensation section, and therefore the liquid film is thinned, and condensation heat exchange is strengthened. Meanwhile, the annular elements are additionally arranged, enhancement of heat transfer of heat exchange areas of the condensation section and the evaporation section is increased, the arrangement of the elements in the evaporation section can further solve the problem that overflowing liquid generated by too thick liquid films returns to a liquid pool again, and influences of cold and hot air flow joining on heat transfer are avoided.

Description

technical field [0001] The invention relates to a novel high-efficiency heat exchanger gravity heat pipe, in particular to a gravity heat pipe which reduces the thickness of condensation film by changing the pipe wall structure, and belongs to the technical field of heat exchange. Background technique [0002] Today's heat transfer engineering is facing two major problems: the study of high thermal insulation materials and high thermal conductivity materials. However, the known thermal conductivity of thermally conductive materials with good thermal conductivity can only reach 10 2 The magnitude of W / m·℃ is far from meeting the needs of rapid heat transfer in some projects. The invention of the heat pipe solves this problem. Its heat transfer coefficient is hundreds or even thousands of times that of ordinary metal materials, and it can transmit a large amount of heat over a long distance through a small cross-sectional area without external power. Among them, the gravity ...

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Problems solved by technology

Another solution is to change the film-like condensation into bead-like condensation, coating the wall with hydrophobic materials or adding a small amount of oily additives to the steam, but neither of them can maintain the bead-like condensation for a long time

In addition, "A Gravity Heat Pipe for Enhanced Heat Transfer" (CN104197761A) enhances heat exchange by adding a liquid sweeping device in the gravity heat pipe. The complex structure is not conducive to popularization

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