Results of laboratory experiments on wide smooth rectangular ducts are reported in terms of the relationship between duct aspect ratio b/h and the shear force on the walls expressed as a proportion of the total boundary shear force, %SFw. This data set, in the range 0.02≤b/h≤50, overlaps and extends the 1985 work of Knight and Patel, for which 0.1≤b/h≤10. A new form of empirical model is proposed for the %SFw‐b/h relationship. When compared with the %SFw predicted by assuming the shear force on an element of the boundary to be simply proportional to its length, the model result is seen to deviate from it, with definite maximum and minimum deviations.
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Rhodes et al. (1994) studied this question.
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