NUMERICAL PREDICTION OF WALL MASS-TRANSFER RATES IN TURBULENT-FLOW THROUGH A 90-DEGREES 2-DIMENSIONAL BEND

The present paper reports a numerical study of mass transfer in a curv ed channel flow using a low Reynolds number k-epsilon model modified t o include the influence of curvature on the turbulent transport. Predi ctions were obtained of now through a 90 degrees 2-D bend for Reynolds numbers of Re = 2 x 10(4), 10(5) and 10(6), curvature ratio's of R-c/ d = 1, 1.5 and 3, and Schmidt numbers of Sc = 500, 1 500 and 5 000. Ba sed on the numerial simulations, the value of the mass transfer coeffi cient, k, was observed to generally decrease and increase along the in ner and outer walls, respectively, compared to the value in a straight duct. The behaviour appears to be sensitive to both the curvature rat io and Reynolds number, being most pronounced for the case of tight be nds and low Reynolds numbers.