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The measurement and prediction of temperatures at the free interface of falling water films under heat transfer
Author(s) -
Borodin A. S.,
Picot J. J. C.
Publication year - 1976
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450540108
Subject(s) - mechanics , materials science , thermodynamics , countercurrent exchange , turbulence , heat transfer , falling (accident) , momentum (technical analysis) , distilled water , radiometer , free surface , thermal diffusivity , optics , physics , medicine , environmental health , finance , economics
Abstract This paper describes an experimental measurement of temperatures at the free liquid interface of distilled water films falling vertically downwards on the outside surface of a copper tube heated internally by a countercurrent circulating liquid. An infrared radiometer was used for the temperature measurements. A prediction for these temperatures is made by solving numerically the governing equations of momentum, continuity and energy. Experimentally estimated temperature profiles were employed as the wall temperature boundary conditions. Internal turbulence eddies and surface wave celerity were considered in the numerical solution by using the eddy diffusivity profile of Mills and Chung. Good agreement between experiment and theory was obtained