IIR document

Evaporative heat transfer in capillary grooved heat pipes.

Author(s) : STEPHAN P.


Heat pipes with axial grooves are widely used for the thermal control of spacecraft and the cooling of electronic equipment. The transport properties of heat pipes depend significantly on their radial heat transfer coefficients in the condenser and the evaporator. For the evaporator, the prediction of former theories which include only macroscopic phenomena have not been very satisfactory. In the paper a new model is presented to calculate the evaporator heat transfer coefficient. It includes the following microscopic phenomena: the short range adhesion forces between the wall and the liquid molecules, the surface tension and the molecular kinetic interfacial heat resistance. The results of the model are compared with the experimental heat pipe data and good agreement is found.

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  • Original title: Evaporative heat transfer in capillary grooved heat pipes.
  • Record ID : 1996-0805
  • Languages: English
  • Source: For a Better Quality of Life. 19th International Congress of Refrigeration.
  • Publication date: 1995/08/20
  • Document available for consultation in the library of the IIR headquarters only.


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