Abstract
Experimental investigation on the turbulent drag reduction with blowing polymer solution from the permeable channel wall was performed. Measurement of the drag reduction has been carried out with changing condition of blowing polymer solution (e.g. blowing rate and concentration). As a result, obvious drag reduction was obtained with blowing polymer solution and the maximum drag reduction rate achieved about 20 %. In addition, it seems that there is close relationship between the drag reduction rate and the mass flux of polymer. Because it is the merit of wall blowing that polymer can exist in the whole near-wall region, we discussed the difference between our results (wall blowing) and the effect of slot injection. Based on these results, the effect of wall blowing polymer solution on the heterogeneous drag reduction was discussed.
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