Determine: (a) The velocity and thermal boundary layer thicknesses at the trailing edge. (b) The local heat flux and surface shear stress at the trailing edge. (c) The total drag force and heat transfer per unit width of the plate.
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- 5.7 The average Reynolds number for air passing in turbulent flow over a 2-m-long, flat plate is . Under these conditions, the average Nusselt number was found to be equal to 4150. Determine the average heat transfer coefficient for an oil having thermal properties similar to those in Appendix 2, Table 18, at at the same Reynolds number and flowing over the same plate.Determine the rate of heat loss from the wall of a building resulting from a 16 km/h wind blowing parallel to its surface. The wall is 24 m long and 6 m high, its surface temperature is 27C, and the temperature of the ambient air is 4C.Engine oil at 100°C and a velocity of 0.20 m/s flows over both surfaces of a 1.1-m-long flat plate maintained at 20°C. Determine: (a) The velocity and thermal boundary layer thicknesses at the trailing edge. (b) The local heat flux and surface shear stress at the trailing edge. (c) The total drag force and heat transfer per unit width of the plate. Determine the velocity boundary layer thickness & at the trailing edge, in m. 8 = i m Determine the thermal boundary layer thicknesses &, at the trailing edge, in m. 8, = i m Determine the magnitude of the local heat flux at the trailing edge, W/m². q" x = i W/m² Determine the local surface shear stress at the trailing edge, in N/m². Ts, L i N/m² Determine the total drag force per unit width of the plate, in N/m. D' = i N/m Determine the magnitude of the heat transfer per unit width of the plate, in W/m. d' = W/m i
- Engine oil at 100°C and a velocity of 0.15 m/s flows over both surfaces of a 1.2-m-long flat plate maintained at 20°C. Determine: (a) The velocity and thermal boundary layer thicknesses at the trailing edge. (b) The local heat flux and surface shear stress at the trailing edge. (c) The total drag force and heat transfer per unit width of the plate. Determine the velocity boundary layer thickness & at the trailing edge, in m. 8 = i m Determine the thermal boundary layer thicknesses 8, at the trailing edge, in m. m Determine the magnitude of the local heat flux at the trailing edge, W/m?. q" x W/m2 i Determine the local surface shear stress at the trailing edge, in N/m?. Ts, L. = N/m2 Determine the total drag force per unit width of the plate, in N/m. D' = i N/m Determine the magnitude of the heat transfer per unit width of the plate, in W/m. W/mEngine oil at 100°C and a velocity of 0.15 m/s flows over both surfaces of a 1.1-m-long flat plate maintained at 20°C. Determine: (a) The velocity and thermal boundary layer thicknesses at the trailing edge. (b) The local heat flux and surface shear stress at the trailing edge. (c) The total drag force and heat transfer per unit width of the plate. Determine the velocity boundary layer thickness & at the trailing edge, in m. 8 = i m Determine the thermal boundary layer thicknesses &, at the trailing edge, in m. 8, = i m Determine the magnitude of the local heat flux at the trailing edge, W/m². q" x = i W/m² Determine the local surface shear stress at the trailing edge, in N/m². Ts, L = i N/m² Determine the total drag force per unit width of the plate, in N/m. D' = i N/m Determine the magnitude of the heat transfer per unit width of the plate, in W/m. q' = W/m iAir at 20°C and with I Bar Pressure is flowing over a flat plate at a velocity of 2.801 m/s. If the plate is 27.5 cm wide and at 60°C, calculate the value of Boundary layer thickness, Average friction coefficient, Shear stress due to friction, Local convective heat transfer coefficient, Average heat transfer coefficient, Rate of heat transfer by convection and Total Drag on the plate.The properties at 40°C are:Density: 1.1298 kg/m³, cp= 1.004 kJ/kg C, k- 0.02774 w/m'C, Kinematic viscosity is 17.13 x 10°
- Engine oil at 100°C and a velocity of 0.05 m/s flows over both surfaces of a 1.1-m-long flat plate maintained at 20°C. Determine: (a) The velocity and thermal boundary layer thicknesses at the trailing edge. (b) The local heat flux and surface shear stress at the trailing edge. (c) The total drag force and heat transfer per unit width of the plate. Determine the velocity boundary layer thickness ô at the trailing edge, in m. 8 = i Determine the thermal boundary layer thicknesses 8, at the trailing edge, in m. 8, = i m Determine the magnitude of the local heat flux at the trailing edge, W/m?. 9". i W/m? Determine the local surface shear stress at the trailing edge, in N/m2. Ts, L. N/m? Determine the total drag force per unit width of the plate, in N/m. D' = i N/m Determine the magnitude of the heat transfer per unit width of the plate, in W/m. W/mAir at 200C flowing at 25 m/s passes over a flat plate, the surface of which is maintained at 270°C. Calculate the rate at which heat is transferred from both the sides of the plate per unit width over a distance of 0.25 m from the leading edge. Properties of air at 145°C are Prandtl number = 0.687; Viscosity = 2.8 X 10-5 m2/s and thermal conductivity = 3.49 X 10-5 kW/m.KAir at 20oC and 1 atm flows over a flat plate at 35 m/s. The plate is 75 cm long and 100 cm depth and is maintained at 60oC. Calculate (a) velocity boundary layer thickness at the leading edge, (b) thermal boundary layer thickness at the distance of 10 cm from the leading edge, and (c) thermal boundary layer thickness at the trailing edge.
- Air at 400C flows with a velocity of 7 m/s over a 5m long and 4m wilde surface of a flat plate whose surface temperature is 800C. Find the rate of heat transfer from the laminar flow region of the surface. (For air at 400C , V = 1.702 × 10-5 , pr = 0.7255, K = 0.02662 w/m . K).Water at 60 ⁰C and velocity of 2 cm/s flows over a 5 m long flat plate which is maintained at a temperature of 20 ⁰C. Determine the total drag force and rate of heat transfer per unit width of the plateEngine oil at 100°C and a velocity of 0.1 m/s flows over both surfaces of a 1.2-m-long flat plate maintained at 20°C.Determine:(a) The velocity and thermal boundary layer thicknesses at the trailing edge.(b) The local heat flux and surface shear stress at the trailing edge.(c) The total drag force and heat transfer per unit width of the plate.