CBE 240 Exam 2- Conceptual Questions fully solved graded A+

CBE 240 Exam 2- Conceptual QuestionsTwo different Newtonian Fluids (A&B) are placed between identical sets of parallel plates as shown below. Each pair of plates is separated by the same distance. Both bottom plates are pulled to the right at a constant velocity and both top plates are held stationary. The force required to pull the bottom plate in contact with fluid A is twice the force required to pull the bottom plate in contact with fluid B. The only motion occurring in each fluid is caused by the movement of the bottom plate. How are the viscosity of the two fluids related? How are the densities of the plates related? - correct answer The viscosity of A > viscosity of B because the force required to move the plate is directly proportional to viscosity The densities are unrelated because the force required to move the plate is only a function of fluid viscosity If mass, length, and time are selected as the three fundamental dimensions, the units of viscosity in the SI system could be written as: - correct answer (kg)/(ms) A liquid flows through a pipe at a Reynolds number of 2900. Which of the following is correct regarding the flow? - correct answer The flow is transitory, oscillating between laminar and turbulent. (Laminar if Re<2100, Turbulent if Re>4000) Which of the following is not a fundamental dimension? - correct answer Velocity With an increase in the shear rate, the apparent viscosity of pseudoplastic fluids - correct answer decreases The viscosity is highest at which rate of shearing strain? - correct answer Where the slope of the shearing rate is the steepest/highest The drag coefficient