Abstract
Steady heat transfer to water and viscoelastic fluid films falling down a vertical tube, for the case of uniform wall heat flux thermal boundary condition, was measured experimentally. The viscoelastic fluids studied were aqueous solutions ofPraestol at 100, 200, and 500 ppm (by weight) concentration. The heat transfer to viscoelastic film was lower than the Newtonian prediction, at any given Prandtl number. A new correlation is proposed for dimensionless laminar and turbulent heat transfer coefficient in terms of ike Weissenberg number, over a range of 300 ≤ Reo ≤ 6,500, and 6 ≤Pro ≤ 30.
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