Q1. Three types of pin fins. The fins will be subjected to a gas in cross flow at v= 10 m/s. The cylindrical fin has a diameter of D = 20 mm, and cross-sectional area is the same for each configuration shown in the sketch. D V, T. V, T V, T. Configuration A Configuration B Configuration C For fins of equal length and therefore equal mass, which fin has largest heat transfe rate? Assume the gas properties are those at T (treat it as air) = 350 K. Hint: Assume the fin can be treated as infinitely long.

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Example :- Calculate the power in W/m3 required for mixing an oil of relative density 0.93 and viscosity 18 N.s/m2 in a tank of 15 Cm diameter and 20 Cm height filled to three- fourths of its volume with oil, if the speed of the agitator is 500 rpm. Calculate the speed of agitator if the same mixing is carried out at the same Reynolds number in a doubled volume tank.

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Suppose a reactor producing exhaust gas that is being transferred to the next building by a 6 mm diameter and 20 m long uninsulated pipe for testing. The exhaust gas enters the pipe at 200 °C with a low rate of 0.003 kg/s. You can assume that the pipe is thin. It’s spring outside and wind is blowing at 5 m/s, while the outside temperature is 15 °C (59 °F). Properties of gas (assume, air) inside of the pipe (assume, Tm = 380 K, 1 atm): cp = 1012 J/kg⋅K, k = 0.0323 W/m⋅K, μ = 221.6 × 10-7 N⋅s/m2, Pr = 0.694; Properties of air outside: Air (assume, Tavg = 340 K, 1 atm): k = 0.0253 W/m⋅K, α = k/ρcp = 2.99x10‒5 m2/s, ν = 14.82 × 10-6 m2/s, Pr = 0.710, β = 1/Tavg Find ReD and GrD outside of the pipe and determine whether it is free or forced convection Estimate heat transfer coefficient for outside air Is it a fully-developed flow inside of the pipe? Or, it is not relevant here. Estimate heat transfer co-efficient for the inside air Find overall heat transfer coefficient Find…

(Viscous flow) A viscous fluid is contained between two infinite, horizontal parallel plates that are spaced 0.5 in. apart. The bottom plate is fixed, and the upper plate moves with a constant velocity, U. The fluid motion is caused by the movement of the upper plate, and there is no pressure gradient in the direction of flow. The flow is laminar. (a) If the velocity of the upper plate is 2.7 ft/s and the fluid has a viscosity of 0.026 lb-s/ft2 and a specific weight of 71 lb/ft3, what is the required horizontal force per square foot on the upper plate to maintain the 2.7 ft/s velocity? F= i lb (b) What is the pressure differential in the fluid between the top and bottom plates? p= i lb/ft²

6.18 Assuming a transition Reynolds number of 5 x 105, determine the distance from the leading edge of a flat plate at which transition will occur for each of the following fluids when u = 1 m/s: atmospheric air, engine oil, and mercury. In each case, calculate the transition location for fluid temperatures of 27°C and 77°C.

Fluid mechanics problem

1.what Reynolds number let Fluid properties in pipe flow are Laminar and Turbulent flow 2. what Reynolds number let Boundary Layer are Laminar and Turbulent flow

Please help me get the correct answer quickly, please. :((