Question

Hi, can you answer each of these step by step:

1) A company wishes to mix a sandwich filling (density = 900 kg m-3) in a 0.75m diameter stirred tank. The tank has a single 6 blade pitched blade turbine (PBT) impeller which has a size of D/T of 0.33 and a Ks of 10. If the impeller rotates at 300 rpm the power draw is 330W. What is the flow regime inside the tank? And estimate the power number under these conditions. Data The topping is shear thinning, the consistency index K = 2- Pa.s and the power law exponent n = 0.7

2)a) For a pipe with laminar flow the E-Curve is given by : E(t)=dQ/Q=u(r)2πdr/(u ̅πR^2 ) What is the corresponding F-Curve? Make sure you show your working and look in textbooks! a)

b) Convert the following into dimensionless time: E(t)= 1/τ e^(-t/τ) and E(t)= τ^2/〖2t〗^3

c) For a stirred tank the E-curve is: E(t)= 1/τ e^(-t/τ) calculate the corresponding F-Curve between 0 and t’

d) Draw a diagram describing the F-Curve for a plug flow reactor

Answer 1