and Joseph, D.D., Drag reduction in pipes lined with Riblets. Liu, K.N., Christodoulou, C., Riccius, O. ![]() ![]() and Naqwi, A., Measurement accuracy of semiconductor LDA system. Furthermore, the velocity profiles measured by LDV indicated that the secondary flow becomes weaker downstream from the riblet bends when a drag reduction is recognized there.ĪNSI/ASME PTC 19.11-1985, Measurement Uncertainty Part 1, Instruments and Apparatus (1985).ĭurst, F., Muller, R. Since the pressure losses of these two riblet bends were almost identical to that of the smooth bend at Re D = 6500, they could cause a net drag reduction of about 4 percent on the piping system including these bends at that Reynolds number. ![]() Two of the riblet bends showed the maximum drag reduction of about 4 percent at Re D = 6500 this reduction rate was significant considering the uncertainty of the present experiments. ![]() All riblet bends reduced the pressure gradient on the smooth pipe downstream from them, which means a drag reduction. The pressure gradients on the smooth pipe downstream from the riblet bends were measured, and also the pressure losses of the bends only were measured. Four riblet bends were tested to investigate the effects of riblets on pipe flows including the secondary flow on the Reynolds numbers Re D=6×10 3−4×10 4.
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