Boiling heat transfer surface, method of preparing same and method of boiling
First Claim
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1. A method of manufacturing a thermally conductive wall surface having nucleate boiling cavities for a heat exchanger through which wall heat is transmitted from a warm fluid to a boiling liquid comprising the steps of (1) mechanically forming non-continuous pits or craters on the surface of said wall;
- (2) electrodepositing a metal on the thus pitted surface at a high current density to produce dendrites and form honeycomb-like nucleate boiling surfaces on said conductive wall surface; and
(3) subsequently plating said dendrites at a lower current density to coat said dendrites with a metal plate.
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Abstract
Improved nucleate boiling cavities are provided in a heat exchange surface by mechanically forming indentations on the heat transfer surface and then electrodepositing a metal on the pitted surface at a high current density followed by strengthening at lower current densities. Also described is a method of transferring heat from a warm fluid to a boiling liquid utilizing the improved nucleate boiling structure.
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Citations
3 Claims
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1. A method of manufacturing a thermally conductive wall surface having nucleate boiling cavities for a heat exchanger through which wall heat is transmitted from a warm fluid to a boiling liquid comprising the steps of (1) mechanically forming non-continuous pits or craters on the surface of said wall;
- (2) electrodepositing a metal on the thus pitted surface at a high current density to produce dendrites and form honeycomb-like nucleate boiling surfaces on said conductive wall surface; and
(3) subsequently plating said dendrites at a lower current density to coat said dendrites with a metal plate. - View Dependent Claims (2, 3)
- (2) electrodepositing a metal on the thus pitted surface at a high current density to produce dendrites and form honeycomb-like nucleate boiling surfaces on said conductive wall surface; and
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Current AssigneeYork International Corporation (Johnson Controls International plc)
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Original AssigneeBorgWarner Incorporated
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InventorsNichols, George M., Albertson, Clarence E., Rasmussen, John N.
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Primary Examiner(s)Mack, John H.
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Assistant Examiner(s)Leader, William
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Application NumberUS05/847,637Time in Patent Office819 DaysField of Search204/29, 204/25, 204/27, 165/133US Class Current205/111CPC Class CodesC25D 5/34 Pretreatment of metallic su...C25D 7/04 Tubes; Rings; Hollow bodiesF22B 37/04 and characterised by materi...F28F 13/187 especially adapted for evap...
