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Effect of D/T Ratio |
Effect of D/T Ratio It was mentioned earlier that impellers power produces flow and an impeller head. In the turbulent region, power is proportional to N^3.D^5 (P@ N^3.D^5) and the pumping capacity of impeller is proportional to N.D^3 (Q@N.D^3) If we combine these equations, we discover that the pumping capacity to specific velocity work of the impellers, H, is proportional to the impeller diameter to the 8/3 exponent in given tank size : (Q/H)p @ (D/T)^8/3 ... at constant power(P). This means, we have a very convenient way to varying the ratio of flow to fluid shear rate by changing impeller size in the system. At constant power, a large impeller produces high flow and low shear rates, While a small impeller produces low flow and higher shear rates. Mixing for Non Newtonian Fluid Viscosity 3,000 mPa.Sec SG. 1.06 Impeller type : Jet Cone Tip Speed design 4.2 m/sec Mixing Time @20 min |
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