WAVY FIN

PROBLEM TO BE SOLVED: To provide a wavy fin having a shape enabling stacking while preventing close contact with each other and permitting storage and conveyance. SOLUTION: In the wavy fin 3, a large number of mountains 5 and valleys 6 formed alternately by lateral walls 4 inclined in the height direction are continuously repeated in the lateral width direction, and the lateral wall 4 is bend alternately at predetermined intervals in the forward/backward direction to form a corrugated plate shape meanderingly extended in the forward/backward direction. The wavy fin is inserted to a flat plate tube for heat exchange. In each of a front end and a rear end of the wavy fin, two or more of the mountains 5 are formed to be rectangular parts 7 in which width dimensions of tops are set larger than those of openings below the tops. COPYRIGHT: (C)2010,JPO&INPIT