HEAT TRANSFER FIN

PURPOSE:To contrive to prevent the boundary layers from developing and consequently to improve the heat transfer rate by a structure wherein a large number of upright- shaved louvers are provided in such directions that the louvers are normal to the air stream lines of the air flowing through between parallel fins respectively in order to cut the stream lines over a wide range. CONSTITUTION:A plurality of the narrow upright-shaved louvers 5 extending nearly radially from the nighborhood around the heat pipe inserting holes 12 of the heat transfer fins 11 are formed in the manner that each of the lourvers 15 is normal to the air stream E-E' passing in the neigborhood of the wall of each fin in the curved form along the outer periphery of each of heat pipes 13 piercing the heat transfer fins. The surmounting walls 15'' provided at both longitudinal ends of each upright-shaved louver 15 are formed nearly parallel to the curved air stream. As a result, the improvement of the heat transfer rate is contrived by cutting the air stream lines over a wide range and consequently preventing the boundary layers from developing and as well as the hindrance of heat conduction from the heat pipes to the fins are eliminated by forming the louvers 15 in the directions along the thermal stream lines flowing from the heat pipes 13 to the fins 11 and furthermore the draft resistance of the air stream flowing between the fins is lowered by forming the surmounting walls 15'' of each louver parallel to the curved air stream lines.