Abstract
This paper presents drag reduction in a pipe flow with riblet. The experiment was carried out in the pipe flow apparatus with test section of inner diameter D=492 mm and length 4 000 mm. The parameters were selected 5 kinds, in order to investigate the details of drag reduction for the shape and size of the isosceles V groove riblet. The velocity profiles, static pressure and flow rate were measured for each experiment in the range of Re=3.0×105∼8.0×105. Consequently it was found that (i) the friction drag reduces in the range of non-dimensional riblet height h+l20 and the maximum drag reduction attains almost 8% at h+=11.4, and (ii) the optimum shape and size of riblet were shown for the maximum drag reduction in a pipe flow.
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