MOMENTUM HEAT AND MASS TRANSFER ANALOGY FOR TURBULENT FLOW IN CIRCULAR PIPES

A numerical integration of equations for the turbulent flow velocity profile has been used to calculate heat and mass transfer coefficients inside a smooth circular pipe. The Marchello and Toor mixing model is used for thermal and mass diffusivity in the wall region. Assumption of thermal diffusivity equal to momentum diffusivity for the central core gives good agreement with experimental heat transfer data. An eddy frequency determined from the Shaw and Hanratty experimental data is superimposed on the region near the pipe wall to agree with experimental mass transfer data at Schmidt numbers up to 100,000. The model is also applicable to non-Newtonian fluids because the local apparent viscosity can be related to the local shearing stress. © 1969, American Chemical Society. All rights reserved.