Title: Method for producing porous surface metal tubes used for intensifying boiling-heat transfer
Application Number: 85100996 Application Date: 1985.04.01
Publication Number: 1002156 Publication Date: 1986.08.06
Approval Pub. Date: Granted Pub. Date: 1989.11.01
International Classifi-cation: C23C4/06,C23C4/16,F28F13/18
Applicant(s) Name: Beijing Chem. Engineering Inst., Chem. Ind. Minist Address:
Inventor(s) Name: Bai Eryi, Ma Longming, Shen Chuanwen
Attorney & Agent:
Abstract:
     This invention is characterised by organic polymer powder with high decomposition temp. used as pore-forming reagent, which is mixed with metal powder in appropriate proportion and sprayed with oxy-acetylen flame on the treated surface of metal tube, forming a porous layer. The porosity is 35-45%, average hole diameter is 20-150 micron and average thickness of the layer is 0.5-0.6 mm. Its boiling heat emission coefficient is 5-6 times higher than that of smooth tubes. This invention is mainly used in tubular heat exchangers needed by chem., petroleum, metallurgical and power industries, etc. for intensifying boiling-heat transfer, so as to increase heat transfer coefficient, to reduce effective temp. difference, to reduc heat transfer area and to lower both expenses of metal and energy consumption.
Time: 6