Two-phase closed type hot siphon tube using water-based carbon nanotube suspension liquid as working fluid

A carbon nanotube and thermosiphon technology, which is applied in indirect heat exchangers, heat exchange materials, lighting and heating equipment, etc., can solve the problem of carbon nanotube suspensions that no one has proposed, and achieve the reduction of inclination angle and heat exchange. The effect of improved performance and reduced overall thermal resistance

Inactive Publication Date: 2007-11-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

[0011] So far, no one has proposed to use carbon nanotube suspension as the working fluid in the thermosiphon to enhance the heat transfer performance of the heat pipe.

Method used

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  • Two-phase closed type hot siphon tube using water-based carbon nanotube suspension liquid as working fluid
  • Two-phase closed type hot siphon tube using water-based carbon nanotube suspension liquid as working fluid

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Embodiment Construction

[0024] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The parameters in the following examples do not limit the present invention.

[0025] In one embodiment of the present invention, the structure of the two-phase closed thermosiphon is shown in Figure 1. The entire heat pipe is made of copper tubes. The outer diameter of the copper tube is 8mm, the wall thickness is 1mm, and the total length is 350mm. The length of section 7 is 100mm, the length of adiabatic section 3 is 100mm, and the length of condensation section 1 is 150mm. The size of the heat pipe can be designed arbitrarily. The evaporating section 7 is heated by an electric heater, the adiabatic section 3 is covered with a Teflon rod 4 for heat preservation, and the inner wall of the tube of the condensing section 1 is processed with evenly arranged axial micro-channels, and the size is not limited. It is recommended to...

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Abstract

The invention relates to a two-phase closed thermosyphon with water-based carbon nano-tube suspension, comprising vaporizing segment, thermal insulation segment and condensing segment. Axial micro grooves arranged evenly are set on the inner wall of condensing segment to increase the area of heat transferring face. Carbon nano-tube suspension, as working fluid is filled in the vaporizing segment. Fluid-loaded rate is 40-60% of vaporizing segment cubage. The carbon nano-tube suspension is mixed solution of de-ionized water and carbon nano-tube. Mass concentration of carbon nano-tube in suspension is 1-2.5%. In using, required heat dispersing elements are attached on the lower end of heat pipe. Depending on evaporation of working fluid in the vaporizing segment of thermosyphon heat is transferred so that heat quantity of required heat dispersing elements is transferred to cooling water in the condensing segment. The invention uses water-based carbon nano-tube suspension as working fluid. Not only heat exchanging performance is improved but also total heat resistance of heat pipe is decreased. Oblique angle of heat pipe is decreased greatly and when the oblique angle of heat achieves horizontal 15 degrees heat exchanging performance is still good.

Description

technical field [0001] The invention relates to a two-phase closed thermosiphon, in particular to a two-phase closed thermosiphon using water-based carbon nanotube suspension as a working medium. The utility model belongs to the field of heat exchange technology and cooling technology of electronic components. Background technique [0002] The two-phase closed thermosiphon is a high-efficiency heat transfer element, which is widely used in the field of energy and power electronic heat pipes. The thermosiphon has the advantages of simple structure, convenient manufacturing and processing, low production cost, and easy industrialization. The thermosiphon achieves heat transfer through the phase change heat of the internal working fluid, so the heat transfer rate is fast, the efficiency is high, and the thermal resistance is small. However, the heat transfer capacity of the thermosiphon is still subject to certain limitations. There are boiling limits, carry limits, dry limit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28D15/02C09K5/04
Inventor 刘振华郭广亮廖亮吕伦春
Owner SHANGHAI JIAO TONG UNIV
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