(B) Air at 27°C flows over a flat plate with a velocity of 3 m/s. Calculate the boundary layer thickness (8) at a distance 25 cm from the leading edge of the plate. The physical properties of air are: p=1.17 kg/m' and -1.85×10 m³/s. 8 4.64 B x Re 1/2
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- Topic: Heat transfer Completely solve and box the final answer. A 20degC water flows to 50cmx60cm flat plate with velocity of 6m/s . The flat plate surface temperature is maintained at 40deg C. The water flows parallel to the 50cm side of the plate. If the kinematic viscosity of water is 78x10-8 m2/s, What is the local heat flux (Q/A) at the end of the plate (k=0.72 W/m deg C, Re=3840000, and Pr=0.7)?Topic: Heat transfer Completely solve and box the final answer. 1. A 20degC water flows to 50cmx60cm flat plate with velocity of 5.2m/s . The flat plate surface temperature is maintained at 40deg C. The air flows parallel to the 50cm side of the plate. If the kinematic viscosity of water is 78x10-8 m2/s, at what length the flow become turbulent?Air is flowing at a speed of 30 m/sec over a flat plate. The air temperature is 20o C and its pressure is 1 atm. The plate is kept at a constant temperature of 65o C. What is the heat transfer rate per unit length between 7.5 cm to 30 cm, from the edge of the plate?
- A spherical particle falling at a terminal speed in a liquid must have the gravitational force balanced by the drag force and the buoyant force. The buoyant force is equal to the weight of the displaced fluid, while the drag 2R?g -(Ps - P1), where R is the radius of the sphere, Pg is its density, and p, is the density of the fluid, and n the coefficient of 9n force is assumed to be given by Stokes' law, Fs = 6trnv. The terminal speed is given by v = viscosity. Using the equation above, find the viscosity of motor oil (in mPa · s) in which a steel ball of radius 0.7 mm falls with a terminal speed of 8.16 cm/s. The densities of the ball and the oil are 7.86 and 0.88 g/mL, respectively. mPa · sHeat transfers Air at temperature 20 C and pressure 1 atm, flow over a flat plate at 3 m/s. The surface temperature of the plate 60 C and the plate width 30 cm, at distance 30 cm from the leading edge .Take the air properties as following, µ=2.02x10^-5 kg/m.s, k=0.0292 W/m.C, Cp=1.01 kJ/kg.C, : ρ = 1.128 kg/ m3, Pr=0.7. Choose the correct answer:A lead pipe has 2 cm inside diameter, 3 cm outer diameter, length of 130 cm. Liquid water at 4°C flows through the pipe with a bulk velocity of 2.50 km/hr. Air is blown around the outside of the pipe at 20 deg C. The inside wvall of the said pipe has a temperature of 8 deg Celsius. Density of liquid water= 1000 kg/m' Cp water=4.210 J/kgK Viscosity of liquid water= 1.5674 x10° Pa.s thermal conductivity of lead = 35 W/mK Find: Overall heat coefficient (U) based on outside surface area b. System's heat transfer rate Prandtl (Pr), Reynolds (Re) numbers and type of flow а. с.
- Air is flowing naturally over a cylinder of D=(15) cm. Air has thermal conductivity 0.027W/mK, kinematic viscosity 1.9*10-5 m2/s, Rayleigh number 108, and Prandtl number0.72. Find the Nusselt numberSand particles (SG = 2.7), approximately spherical withdiameters from 100 to 250 μm, are introduced into anupward-flowing stream of water at 20°C. What is theminimum water velocity that will carry all the sand particlesupward?Air at atmospheric pressure enters a heating duct with dimensions of 3 x 6 in. The air enters the 16 ft long duct with a temperature of 32 fahrenheit, and the duct surface is maintained at 150 fahrenheit. If the air exit temperature is to be 68 fahrenheit, what is the air flow, in lb/hr? (answer in whole number) For air, R = 53.342 ft-lbf/lbm-R, k = 0.173 Btu-in/ft2-hr-F, and cp = 0.24 Btu/lbm-
- Q2: Air at standard conditions of I atm and 27°C flows over a flat plate at 20 m/s. The plate is 60 cm square and is maintained at 97°C. Calculate the heat transfer from the plate. Answers: Q= 681 W,Air at atmospheric pressure enters a heating duct with dimensions of 3 x 6 in. The air enters the 16 ft long duct with a temperature of 32 F, and the duct surface is maintained at 150 F. If the air exit temperature is to be 68 F, what is the air flow, in lb/hr? (answer in whole number) For air, R = 53.342 ft-lbf/lbm-R, k = 0.173 Btu-in/ft2-hr-F, and cp = 0.24 Btu/lbm-A 20degC water flows to 50cmx60cm flat plate with velocity of 6m/s . The flat plate surface temperature is maintained at 40deg C. The water flows parallel to the 50cm side of the plate. If the kinematic viscosity of water is 78x10-8 m2/s, What is the local heat flux (Q/A) at the end of the plate (k=0.86 W/m deg C, Re=3840000, and Pr=0.7)? Round your answer to 2 decimal places.