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Heat transfer in turbulent flow on a horizontal tube falling film evaporator. a theoretical approach

✍ Scribed by D. Barba; R. Di Felice

Publisher
Elsevier Science
Year
1984
Tongue
English
Weight
533 KB
Volume
51
Category
Article
ISSN
0011-9164

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✦ Synopsis

A simplified theoretical approach for the prediction of evaporation (nonucleate boiling) heat transfer coefficient in a horizontal tube falling film is proposed. The correlation is derived from an analysis of the thermal boundary layer under the assumption of turbulent flow regime and taking into account the thermal developing region. A diagram to evaluate E(p2/p2gk3)1'3 as a function of Re and Pr is proposed.

A regression analysis of the numerical computations allows us to provide a dimensionless formula ~(~2/p2gk3)1'3 = 0.046 Re0*1*pr0~47 valid in the ranges Re = 1500-5000 and Pr = 1-5. SYMBOLS L? -acceleration of gravity, m/s2 h _x -local heat transfer coefficient, KJ/m' "C h -average heat transfer coefficient, KJ/m "C k -thermal conductivity of liquid, KJ/m "C ku -numerical constant in Deissler Eq. (4) -Nusselt number Pr -Prandtl number ht -turbulent Prandtl number R -tube radius, m Re -Reynolds number T -local temperature of the liquid, "C T sat -saturation temperature of the liquid, "C

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