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The intermittency factor in a thick axisymmetric boundary layer with positive pressure gradient (diffuser-flow) was evaluated with hot-wire anemometers and a multi-channel analyzer. The probability density of the signal S(t) (a space–time derivative of the streamwise velocity) is evaluated and then decomposed into three separate curves representing fluids in the turbulent, the transition, and the non-turbulent states respectively. Different values of the intermittency factor γ are calculated by taking different fractions of fluid in the transition state with the turbulent fluid. A model of flow in a conical diffuser is suggested.
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Azad et al. (1971) studied this question.
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