flow over flat plate with unheated starting length
For the shown problem the plate is heated after \(X_{o}\) from the trailing edge it required to obtain only expression for
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2. A heated flat plate 1.0 m long (in the direction of flow) and 0.5 m...
2. A heated flat plate 1.0 m long (in the direction of flow) and 0.5 m wide is maintained at a constant temperature of 100°C. Cooling water at a temperature of 24°C flows over the top of the plate at 15 cm/s. Assume the bottom of the plate is adiabatic. a. Determine the heat transfer rate from the plate. b. A trip wire is placed at the leading edge of the plate, tripping the flow to turbulent. Determine the heat...
Problem 4 Air at 100 C flows across a thin, flat plate of subliming naphthalene that...
Problem 4 Air at 100 C flows across a thin, flat plate of subliming naphthalene that is 3.4 m long. The Reynolds number at the trailing edge of the plate is at the upper limit for a laminar boundary layer (Re 5e5). Estimate: (a) the average rate of sublimation in kmol/s*m2; and (b) the local rate of sublimation 0.5 m from the leading edge. Vapor pressure of naphthalene = 10 torr viscosity of air 0.0215 cP; molar density of air...
The velocity profile for a turbulent boundary layer over a flat plate is to be approximated...
The velocity profile for a turbulent boundary layer over a flat plate is to be approximated by the expression и an"* +b7072 where n=y/8 U a) (10P) Evaluate the coefficients a and b b) (20P) Obtain an expression for 8/x c) (5P) Obtain an expression for shear stress coefficient Cf. d) (5P) Draw velocity profile precisely.
Air flows with a velocity of 20 m/s over a flat plate of length 2 m....
Air flows with a velocity of 20 m/s over a flat plate of length 2 m. The air properties are k = 0.030 W/mK, V = 20.92 x 10-6 m/s, Pr=0.700. a. What type(s) of flow (laminar/turbulent) exist on this plate? b. If the following relations are given for the laminar and turbulent local convection coefficients over the plate, haminar (x) = 20 houwbudemo (x) = .52 where x is the distance from the plate leading edge. Find the average...
Air at 20 °C and 1 atm. flow over a flat plate with 35 m/s. The...
Air at 20 °C and 1 atm. flow over a flat plate with 35 m/s. The size of the plate is 75 cm by 75 cm and is maintained at 60 °C. Calculate: a) The heat transfer rate 40 cm from the leading edge of the plate. b) The heat transfer rate at the end of the plate (at x = L). c) The heat transfer rate from the entire plate. d) The heat transfer rate at the...
For laminar flow over a flat plate, the local heat transfer coefficient hx =x-1/2 where x...
For laminar flow over a flat plate, the local heat transfer coefficient hx =x-1/2 where x is the distance from the leading edge (x-0) of the plate. What is the average heat transfer coefficient from the leading edge to location x
Use the integral method for boundary layer flow and convective heat transfer over a flat plate he...
Use the integral method for boundary layer flow and convective heat transfer over a flat plate heated by maintaining a constant heat flux q"w, for the case of very low Prandtl number, Pr0. Assume that the free stream velocity of the fluid, U, and free stream temperature, T-do not vary with x. Using the integral form of energy equation, show that under these conditions: (a) the temperature profile, (T- T) is given by, 41 2 CT-T oa (b) the wall...
6.4 For laminar flow over a flat plate, the local heat trans- fer coefficient h, is known to vary as x72, where x i...
6.4 For laminar flow over a flat plate, the local heat trans- fer coefficient h, is known to vary as x72, where x is the distance from the leading edge (x = 0) of the plate. What is the ratio of the average coefficient between the leading edge and some location x on the plate to the local coefficient at x? -1/2
6.4 For laminar flow over a flat plate, the local heat trans- fer coefficient h, is known to...
1. For laminar flow over a flat plate, the local heat transfer coefficient, hx, is known to vary as hx~Cx-12 where C is...
1. For laminar flow over a flat plate, the local heat transfer coefficient, hx, is known to vary as hx~Cx-12 where C is a constant and x is the distance from the leading edge (x-0) of the plate. What is the ratio of the average coefficient between the leading edge and some location x on the plate (h,) to the local coefficient at x (h)? (15%)
1. For laminar flow over a flat plate, the local heat transfer coefficient, hx,...
Problem #3 Air flows over a flat plate at 4 m/s. An approximation for the x...
Problem #3 Air flows over a flat plate at 4 m/s. An approximation for the x component of velocity in the in- compressible laminar boundary layer is a sinusoidal variation from u-0 at the surface (y-0) to the freestream velocity, U, at the boundary-layer edge (y-5). The equation for the profile is u-Usin( %), where cVx and c is a constant. The boundary layer is 9 mm thick 1 m from the edge of the plate. (a) Predict the boundary-layer...
2. A heated flat plate 1.0 m long (in the direction of flow) and 0.5 m wide is maintained at a constant temperature of 100°C. Cooling water at a temperature of 24°C flows over the top of the plate at 15 cm/s. Assume the bottom of the plate is adiabatic. a. Determine the heat transfer rate from the plate. b. A trip wire is placed at the leading edge of the plate, tripping the flow to turbulent. Determine the heat...
Problem 4 Air at 100 C flows across a thin, flat plate of subliming naphthalene that is 3.4 m long. The Reynolds number at the trailing edge of the plate is at the upper limit for a laminar boundary layer (Re 5e5). Estimate: (a) the average rate of sublimation in kmol/s*m2; and (b) the local rate of sublimation 0.5 m from the leading edge. Vapor pressure of naphthalene = 10 torr viscosity of air 0.0215 cP; molar density of air...
The velocity profile for a turbulent boundary layer over a flat plate is to be approximated by the expression и an"* +b7072 where n=y/8 U a) (10P) Evaluate the coefficients a and b b) (20P) Obtain an expression for 8/x c) (5P) Obtain an expression for shear stress coefficient Cf. d) (5P) Draw velocity profile precisely.
Air flows with a velocity of 20 m/s over a flat plate of length 2 m. The air properties are k = 0.030 W/mK, V = 20.92 x 10-6 m/s, Pr=0.700. a. What type(s) of flow (laminar/turbulent) exist on this plate? b. If the following relations are given for the laminar and turbulent local convection coefficients over the plate, haminar (x) = 20 houwbudemo (x) = .52 where x is the distance from the plate leading edge. Find the average...
For laminar flow over a flat plate, the local heat transfer coefficient hx =x-1/2 where x is the distance from the leading edge (x-0) of the plate. What is the average heat transfer coefficient from the leading edge to location x
Use the integral method for boundary layer flow and convective heat transfer over a flat plate heated by maintaining a constant heat flux q"w, for the case of very low Prandtl number, Pr0. Assume that the free stream velocity of the fluid, U, and free stream temperature, T-do not vary with x. Using the integral form of energy equation, show that under these conditions: (a) the temperature profile, (T- T) is given by, 41 2 CT-T oa (b) the wall...
6.4 For laminar flow over a flat plate, the local heat trans- fer coefficient h, is known to vary as x72, where x is the distance from the leading edge (x = 0) of the plate. What is the ratio of the average coefficient between the leading edge and some location x on the plate to the local coefficient at x? -1/2
6.4 For laminar flow over a flat plate, the local heat trans- fer coefficient h, is known to...
1. For laminar flow over a flat plate, the local heat transfer coefficient, hx, is known to vary as hx~Cx-12 where C is a constant and x is the distance from the leading edge (x-0) of the plate. What is the ratio of the average coefficient between the leading edge and some location x on the plate (h,) to the local coefficient at x (h)? (15%)
1. For laminar flow over a flat plate, the local heat transfer coefficient, hx,...
Problem #3 Air flows over a flat plate at 4 m/s. An approximation for the x component of velocity in the in- compressible laminar boundary layer is a sinusoidal variation from u-0 at the surface (y-0) to the freestream velocity, U, at the boundary-layer edge (y-5). The equation for the profile is u-Usin( %), where cVx and c is a constant. The boundary layer is 9 mm thick 1 m from the edge of the plate. (a) Predict the boundary-layer...
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