Studies on Thermal and Material Transfer in Turbulent Flow: I. Problems in Turbulent Heat Transfer. II. An Attempt to Measure the Eddy Diffusivity in Uniform Turbulent Flow

I. A method of correlating experimental va1ues of the eddy viscosity in turbulent flow inside tubes and rectangular channels is described. A procedure for predicting the influence of physical properties on the ratio of the eddy eo11duetivity to the eddy viscosity is presented. The values of the eddy conductivity obtained in this manner have been used to predict rates of heat transfer inside tubes which check well with experimental values. II. A study of the evaporation of iodoform containing radioactive iodine is described. An attempt was made to measure the eddy diffusivity in a turbulent air stream through this study. The use of radioactive materials for measuring small. concentrations of vapors in gaseous mixtures was investigated. No measurements of concentrations in turbulent air flow, and consequently, values of the eddy diffusivity were obtained.