MANUFACTURE OF HEAT TRANSFER PIPE

摘要

PURPOSE:To manufacture a heat transfer pipe which has the bark-shaped unevennesses on the inside wall surface and is large in the surface area and excellent in the acceleration effect of the boiling heat transfer by flowing a copper plating soln. contg. both a specified surface-active agent and a chloride ion to the inside of the heat transfer pipe and electroplating the inside wall surface. CONSTITUTION:The radiating fins 3 are fitted on the outside surface of a heat transfer pipe 10 made of Cu and press-contacted by expanding the heat transfer pipe. Cu plating is performed on an inside surface of the heat transfer pipe 10 by circulating a Cu plating soln. 9 incorporated in a plating vessel 7 through a joining pipe 11 and a pump 12 and conducting electricity between an anode 14 provided in the inside and the pipe 10 as a cathode via a connecting terminal 15 by means of a DC power source 13. 5-10mg/l polyoxyethylene oleyl ether series surface-active agent and extremely small quantities of chloride ion such as hydrochloric acid are contained in the plating soln. making copper sulfate a copper ion source. A copper plated surface having the bark-shaped unevennesses is formed on the inside surface of the pipe 10 and the heat transfer effect of a heat exchanger such as a heat pipe wherein the evaporation and the condensation are repeated by sealing a freon liquid is remarkably increased.