Thermal entrance length in falling liquid film heat transfer
- Lafayette Coll., Easton, PA (United States). Dept. of Mechanical Engineering
Subcooled and evaporating falling liquid films are frequently encountered in the process industry, desalination, and nuclear reactor safety. Thermal entrance lengths in a subcooled falling liquid film were studied experimentally on a vertical cylindrical heater preceded by an adiabatic section. A wavy-laminar flow regime close to the transition to turbulent flow was achieved. Water at atmospheric pressure was used as the test fluid. Heating surface temperatures were measured at eight axial locations along the flow direction and the local heat transfer coefficients were obtained as functions of heat flux and mass flow rate. Heat transfer coefficients were observed decreasing along the heater and reaching a minimum. The influences of the Reynolds number and heat flux on the thermal entrance length at low heat fluxes were weak. Both the Reynolds number and the heat flux strongly influenced the thermal entrance length at relatively high heat fluxes.
- OSTI ID:
- 234295
- Report Number(s):
- CONF-960306-; ISBN 0-7918-1226-X; TRN: IM9624%%336
- Resource Relation:
- Conference: ICONE 4: ASME/JSME international conference on nuclear engineering, New Orleans, LA (United States), 10-13 Mar 1996; Other Information: PBD: 1996; Related Information: Is Part Of ICONE-4: Proceedings. Volume 1 -- Part A: Basic technological advances; Rao, A.S. [ed.] [General Electric Nuclear Energy, San Jose, CA (United States)]; Duffey, R.B. [ed.] [Brookhaven National Lab., Upton, NY (United States)]; Elias, D. [ed.] [Commonwealth Edison, Downers Grove, IL (United States)]; PB: 534 p.
- Country of Publication:
- United States
- Language:
- English
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