To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of

To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of Correct Answer $${\left( {1.2} \right)^{\frac{5}{3}}}$$

Bissoy MCQ

Related Questions

At low Reynold's number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied:
Po = ρ/ρN3D5: Power number
Re = ρ ND2/μ: Reynold's number
N is the impeller rotational speed and D is the impeller diameter.
Calculate the power number for the turbulent flow of particles in the centrifuge tube when the number of impeller is 5 and diameter of the impeller is 5cm.
The power number for a stirred tank becomes constant at high Reynolds number. In this limit, the variation of power input with impeller rotational speed (N) is proportional to
Output of a bulldozer is
(i) Increased if drawbar HP of the tractor is increased for a given hauling distance
(ii) Decreased if drawbar HP of the tractor is increased for a given hauling distance
(iii) Increased if the hauling distance is increased for a given drawbar HP of the tractor
(iv) Decreased if the hauling distance is increased for a given drawbar HP of the tractor
How much fraction is the diameter of impeller than the diameter of the vessel in a stirred tank bioreactor?
In case of CVT, if the drive pulley diameter is decreased and the driven pulley diameter is increased, output torque will be increased and output speed will be decreased.
The entrance length required for the flow to become fully-developed turbulent flow is dependent on (i) Surface finish (ii) Downstream conditions (iii) Fluid properties Identify the correct answer
In a fully turbulent flow (Re > 105) in a pipe of diameter 'd', for a constant pressure gradient, the dependence of volumetric flow rate of an incompressible fluid is
The diameters of a large and a small vessel are 1.62 m and 16.2 cm, respectively. The vessels are geometrically similar and operated under similar volumetric agitated power input. The mixing time in the small vessel was found to be 15 s. Determine the mixing time (in seconds) in the large vessel.
Two vessel P and Q contain milk and water in ratio 3 : 2 and 5 : 3 respectively. If 10 liters of the mixture is removed from vessels P and poured in vessel Q then ratio of milk to water in vessel Q becomes 8 : 5. Find the initial quantity of water in vessel Q.