| 摘要 |
PURPOSE:To accelerate boiling heat transfer by a heat exchanger tube by carrying out expanding work for fixing heat radiating fins and by forming an uneven metallic layer on the inner wall surface of the heat exchanger tube by plating so as to increase the surface area. CONSTITUTION:A heat exchanger tube is expanded so as to fix heat radiating fins on the outside of the tube, and a metallic layer having ruggedness is formed on the inner wall surface of the heat exchanger tube by plating with a plating soln. contg. an oxyethylene surfactant and chloride ions as additives. A copper plating soln. such as an acidic plating soln. contg. copper sulfate is advantageously used as the plating soln. from the viewpoint of heat conductivity. |
