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International Heat Transfer Conference 9

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

AN EXPERIMENTAL−NUMERICAL METHOD OF INVESTIGATION OF FALLING−FILM HEAT TRANSFER ON A HORIZONTAL TUBE WITH NONUNIFORM HEAT FLUX

V. Przulj
Faculty of Mechanical Engineering University of Sarajevo, Sarajevo, YU

E. N. Ganic
Sarajevo School of Science and Technology, Hrasnicka cesta 3a, 71210 Ilidza – Sarajevo, Bosnia and Herzegovina

DOI: 10.1615/IHTC9.960
pages 365-370

Abstract

Heat transfer experiments in the falling liquid film flowing along circumference of outside surface of the horizontal tube were conducted under the nonuniform surface heat flux. The experiments were performed with subcooled destilled water on a stainless steel tube of 25.4 mm o.d. which was heated by an electrical cartridge heater. Due to the relative low values of thermal conductivity of the tube material, the tube surface temperature is significantly lower than one recorded by the thermocouples imbedded below the surface. Therefore, a determination of the local heat transfer rates requires the numerical solution of the two-dimensional stady-state inverse conduction problem for the test tube and heater geometry. The effects of liquid flow rate (0.007−0.063 kg/m s), film temperature (20−80 °C), and the distance between the spray tube and the test tube (5−25.4 mm) on the local and average heat transfer coefficient was investigated by this combination of both the experimental and numerical approach.

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