CONTACT FILM HEAT EXCHANGER Russian patent published in 1994 - IPC

FIELD: heat-power engineering. SUBSTANCE: heat exchanger has corrugates working surfaces which form zigzag passages for gaseous heat-transfer agent. Sections of these surfaces at normal located at angle less than 90 deg to vertical are made with regular roughness 5 across direction of motion of film 12. Mounted in there passages at distance from working surfaces equal to quintuple depth of regular roughness 5 are guides for gaseous heat-transfer agent which are parallel to sections of working surfaces at normal located at angle more than 90 deg. to vertical. During operation of heat exchanger, bottom layer of liquid in film 12 running against projection of roughness 5 is braked while its outer layer retain its velocity owing to which vortices 13 arise which agitate layer of liquid. When film 12 comes off projection of roughness 5 vortices 15 arise due to conservation of direction of velocity vector 14 of film flow which also favour agitation. Construction of heat exchanger increases heat exchange by 2.5 to 3 times and velocity of gaseous heat-transfer agent by 2 times. EFFECT: intensified heat exchange and extended range of working modes. 2 cl, 4 dwg