A large quantity of a highly viscous monomer solution with a specific gravity of 0.944 and viscosity of 0.251 kg/ms is stored in a large tank held under atmospheric pressure. To prevent a known problem of stratification of the solution within the tank over long periods, the monomer is periodically recirculated using a small external pump through a smooth-walled pipeline that is 30 m in length and has an internal diameter of 78 mm.  In the recirculation process, it is assumed that the liquid is drawn from and returned to the tank such that the head required for pumping is due entirely to overcoming frictional losses. The head (Hp) required for pumping is 5.8 m.  (a). Determine the power requirement of the pump if the recirculation rate is 15000 kg per hour and the pump has an overall efficiency of 68%.                 (b). Calculate the Reynolds number and identify the flow pattern in pipe section

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Units and Dimensions

Dimensions are the basic concepts of the measurement of quantities. Units are the means of expressing the dimensions. For instance, an area has a dimension of L2 and a unit of m2.