Heat transfer in falling film on a horizontal tube
- Univ. Stuttgart (Germany). Inst. fuer Technische Thermodynamik und Thermische Verfahrenstechnik
This paper presents some results of an experimental investigation of heat transfer in liquid films falling on a horizontal smooth tube performed under still and flowing air conditions. Heat transfer measurements conducted with water and isopropyl alcohol were supplemented by investigations of film breakdown and temperature distributions in axial and circumferential direction of the test tube. Film breakdown was observed to depend mainly on the heat flux, the flow rate, the flow pattern (droplets, columns, sheet), and the physical properties of the liquid. Temperature distributions were affected by the flow pattern. Heat transfer measurements in still air showed satisfactory agreement with some existing correlations. In the case of flowing air, a considerable increase in heat transfer due to evaporation at the film surface was observed.
- Sponsoring Organization:
- Deutsche Forschungsgemeinschaft, Bonn (Germany)
- OSTI ID:
- 445430
- Report Number(s):
- CONF-950828-; ISBN 0-7918-1713-X; TRN: IM9713%%166
- Resource Relation:
- Conference: 1995 National heat transfer conference, Portland, OR (United States), 5-9 Aug 1995; Other Information: PBD: 1995; Related Information: Is Part Of 1995 national heat transfer conference: Proceedings. Volume 12: Falling films; Fundamentals of subcooled flow boiling; Compact heat exchanger technology for the process industry; HTD-Volume 314; Sernas, V. [ed.] [Rutgers-the State Univ., New Brunswick, NJ (United States)]; Boyd, R.D. [ed.] [Prairie View A and M Univ., TX (United States)]; Jensen, M.K. [ed.] [Rensselaer Polytechnic Inst., Troy, NY (United States)]; PB: 191 p.
- Country of Publication:
- United States
- Language:
- English
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