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Evaporation heat transfer in capillary grooves of heat pipes.

Wärmedurchgang bei Verdampfung aus Kapillarrillen in Wärmerohren.

Author(s) : STEPHAN P.

Type of monograph: Other

Summary

A model is presented for calculating the radial heat-transfer coefficient during evaporation from capillary grooves of heat pipes. Calculation is made difficult above all by the possibility of compression of the heat flow in a "microzone", where the liquid-vapour phase boundary approaches the wall. In the microzone the heat transfer is affected both by the deviation of the liquid-vapour phase boundary and by the intermolecular force between the liquid and the wall. The molecular-kinetic heat resistance at the phase boundary can lower heat transfer considerably. The model couples the thermohydraulic processes in the microzone with the heat conductivity in the evaporator wall and in the core of the liquid. The results are discussed on the basis of practical examples. The microzone was found in spite of its tiny size, to affect greatly the macroscopic heat transfer. The calculated heat-transfer coefficient agrees well with the experimental values. During the Hague Congress of the IIR, August 19-25, 1995, the author was awarded the IIR Sadi Carnot Prize to young researchers for this work.

Details

  • Original title: Wärmedurchgang bei Verdampfung aus Kapillarrillen in Wärmerohren.
  • Record ID : 1996-0617
  • Languages: German
  • Publication: Verein deutscher ingenieure - Germany/Germany
  • Publication date: 1992
  • Source: Source: vol. 19; n. 59; 123 p. (14.8 x 21); fig.; tabl.
  • Document available for consultation in the library of the IIR headquarters only.

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