Batch blend time in square stirred tanks

Batch mixing in cylindrical and square stirred tanks was Studied using a spectrophotometer. A number of different impeller types and different impeller diameters were tested. The results for the cylindrical tank compared very well with the Grenville correlation for blend time. A nearly identical correlation equation can be used for the square tank if the diameter of the square tank is based on the side dimension of the tank and the power number is assumed to be the same as that for a cylindrical tank. The square tank geometry is widely used in the water treatment industry, where this correlation is expected to find useful application. (c) 2005 Elsevier Ltd. All rights reserved.