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The experimental results of pressure distribution and velocity profile of diverging and converging flows are obtained. The results of dilute polymer solutions are compared with those of Newtonian fluids. In a converging flow, a remarkable drag reduction such as a pipe flow is not recognized. In a diverging flow, when α=5° and the concentration becomes 60 ppm, pressure recovery represents a value about 30% larger than Newtonian fluids. The logarithmic velocity distribution are shifted upwards from the law of the wall due to the influence of both the pressure gradient and polymer additives.
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Kato et al. (1980) studied this question.
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