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The change of conveying medium includes two contents: a. Change of medium density When the density of conveying medium is different from the density of water at normal temperature, the head, flow rate and efficiency of the pump are unchanged. Only the power of pump shaft varies with the conveying medium. Obtained: B. viscous liquid viscous fluid delivery on the performance of the pump a great influence on the liquid viscosity, the pump structure, the shape of the impeller and surface roughness and other factors. As the viscosity of the liquid increases, the Reynolds number decreases and the hydraulic friction loss increases. As a result, the lift and flow rate decrease, that is, the Q-H curve decreases (but the lift of the closing point is almost constant). At the same time, the shaft power is increased due to the increase of the friction loss, which drastically reduces the efficiency of the pump and allows the cavitation margin to increase. When the viscous liquid viscosity exceeds 20mPa · s, the performance must be converted.
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