Abstract
An experimental and theoretical study has been made of the turbulent mass transfer for large Schmidt numbers in the entrance region of a circular tube in which a turbulent boundary layer with small negative pressure gradients develops. Measurements of the local and the over-all mass transfer rates were carried out by use of an electrochemical method for Reynolds numbers of 1×104, 2×104 and 3×104 and Schmidt number of 1561.
A method for the prediction of mass transfer rates in the turbulent boundary layers is also provided.
The equation of conservation of matter is reduced into a form of the heat conduction equation by using von Mises transformation. The equation is then solved by assuming that the distribution of the eddy diffusivity in the developing boundary layer at the entrance region of a circular tube is the same as that for fully developed tube flow and using an eigenvalue technique.
The solution agrees fairly well with the experimental results. This suggests that the above mentioned assumption for the eddy diffusivity distribution in the boundary layer is valid.
