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Wall-pressure fluctuation measurements are reported for the fully developed turbulent flow of glycerine in a long pipe. Because of the relatively large viscous scales associated with glycerine, it has been possible to perform pressure fluctuation spectral measurements for 0.7≤d+≤1.5, where d+ is the transducer diameter expressed in wall units. The data presented are for d+ values smaller than ever before reported.
Lauchle et al. (Thu,) studied this question.