Process for the preparation of a surface of a metal wall for the transfer of heat
AssigneeSueddeutsche Kuehlerfabrik Julius Fr. Behr GmbH & Co. KG
InventorHerbert Muellejans
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Abstract
An improved metallic heat transfer surface for heat transfer during change of phase of a medium in contact therewith and method of making. A smooth metallic surface is lightly etched to form evaporation and/or condensation nuclei. The nuclei are defined by peaks and valleys in the material, the peaks substantially extending to the envelope of the surface prior to etching and the vallyes extending into said material not more than 10.mu.(1.times.10.sup.-3 mm).
Claims3
A heat-tube having contained for flow therein a medium which transports and transfers heat and which medium is vaporizable and condensable, said heat-tube having a first portion where the medium is vaporized by the application of heat and a second portion where the medium is condensed, and said heat-tube having an inner metallic wall effective for heat transfer, produced according to the process of providing a mechanically smooth surface of said metallic wall;
- and chemically etching said smooth surface to an extent that valleys at least with respect to the original smooth surface, are formed therein with peaks lying on the envelope of said original smooth surface, said peak-to-valley distance not exceeding 10.mu..
Dependencies are inferred from the claim text.