Probem: A liquid at 293 K flow at a the rate of 0.7 kg/s in a glass pipe having a diameter of 64 mm. The liquid density is 1000 kg/m² with a viscosity of 2 cp. (a) Calculate the Reynolds number. Is this flow turbulent or laminar? (b) Calculate the flow rate needed in m³/s and velocity in m/s for a typical flow rate that is laminar. (Hint: Choose a Reynolds number within the laminar region.) Problem 2: Hot oil at a flow rate of 2.98 kg/s (c = 1.9 kJ/kg.K) enters an existing counterflow exchanger at 395 K and is cooled by water entering at 320 K (under pressure) and flowing at a rate of 0.68 kg/s. The overall U = 340 W/m².K and area A = 12.5 m². Calculate the heat-transfer rate and the exit oil temperature. (Hint: Use the concept of heat exchanger effectiveness factor.) Open Microsoft 365 (Office) 97

a) (i) What are a Newtonian fluid and a -Newtonian fluid? Classify pendent non-Newtonian fluids and illustrate - flow time- behaviours in a diagram g. shear stress vs. shear (ii) across a flat plate and the s with the aid of a schematic diagram. Explain boundary concept for a flow

1) Consider the infinitely tall, annular mixing tank. The fluid to be mixed is Fluid between the inner cylinder and the outer wall. The fluid is mixed by a Fluid spinning the inner cylinder at an angular velocity of n (s-1). The tank has an inner radius of R (m) and the R. inner cylinder has a diameter of k (m). Fluid There is no net flow in the vertical or radial directions. Top view Answer the following questions about Side view this sytem:

1. An incompressible fluid of kinematic viscosity v = μ/p= 10-4 m²/s flows steadily through a circular pipe of diameter d = 10 cm. The pipe flow is fully developed. Friction Factor If the average velocity V is 2 m/s, is the flow laminar or turbulent? What is the value of the friction factor, f? If the pipe is perfectly smooth on its internal surface and V is 20 m/s, the pipe flow is turbulent (double check yourself). Evaluate its friction factor using the Moody chart below. Repeat (c) by numerically solving the Colebrook formula (using, for example, Matlab). Attach the source code you used. Suppose that the pipe internal surface is rough. Also suppose that increasing V up to 200 m/s yields no change in the value of f found in (a). Determine the relative roughness, e/d, using the Colebrook formula. 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.015 0.01 Laminar Flow 64 Material Concrete, coarse Concrete, new smooth Drawn tubing Glass, Plastic Perspex Iron, cast Sewers, old Steel, mortar…

A Newtonian fluid with constant density flows in a parallel-plate apparatus that separated by a distance d and length L as shown in Figure 1. The top plate is moving in z-direction with a velocity uw. Derive the velocity distribution of the fluid, vz as a function of y using equation of motion in Appendix 1. List the postulates and you may neglect the gravity force.