TURBULENT HEAT TRANSFER AND PRESSURE DROP MEASUREMENTS FOR VISCOELASTIC FLOWS THROUGH RECTANGULAR PASSAGES

摘要

The fully established friction factors and heat transfer coefficients of the turbulent flow of viscoelastic fluids in a 5:1 rectangular duct were measured experimentally. The bottom wall, one of the longer sides of the duct, was heated by passing direct electric current through it, yielding constant peripheral wall temperature and constant heat input per unit length along the bottom wall. The other surfaces were adiabatic. The test section is 150 hydraulic diameters long. The fluids studied were aqueous solutions of three different polymers (potyacrylamide, polyethyleneoxide, and hydroxyethylcellulose).