A STUDY OF MASS TRANSPORT IN TURBULENT FLOW

Abstract

Considering the analogical equation for mass transfer with the kinematic energy equation, a new eddy diffusivity is defined in much the same way as the eddy viscosity presented in the previous paper⁵⁾. Being different from the conventional eddy diffusivity, the newly defined eddy diffusivity can be determined uniquely on the notice point from a single mean concentration gradient to any direction at that point.
At the transitional region from laminar to turbulent flow of liquid in a circular pipe, further, experimental values of the newly defined eddy diffusivity are obtained by simultaneous measurment of the liquid velocity fluctuations and the concentration fluctuations of injected tracer by electro-chemical techniques.