Question

A plate of length 30 mm in the direction of the flow, a width of 45...

A plate of length 30 mm in the direction of the flow, a width of 45 mm and thickness of 1mm, has a surface temperature of 78oC is placed in a stream of air at a temperature of 30oC and velocity of 3.5m/s . Calculate:

  • The heat loss from the top and bottom of the plate
  • The heat loss from a cylinder 5cm long and has the same volume as the plate and placed across the flow.

for air: ν= 18.4×10-6 m2/s, Pr = 0.704, k = 0.0282 W/mK.

Homework Answers

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
there is a plate with 2ft width, 4ft length and 130°F of the surface temperature. awater...
there is a plate with 2ft width, 4ft length and 130°F of the surface temperature. awater with 50°F of temperature flows on this plate with 9ft/s velocity. Calculate the average heat transfer coefficient and the convective heat loss in this plate. For the calculation please use the following constant properties. heat conductivity(k)=0.36 Btu/(hr ft °F) viscosity=5.14×10^(-4) lbm/(ft s) density=62.11 lbm/(ft^(3)) Pr=5.12 Nu=0.036×Pr^(1/3)×Re^(2/3):laminar flow Nu=0.036×Pr^(1/3)×(Re^(0.8)-23200):turbulent flow
a- A plate of length 4m in the direction of the flow and of width 2m...
a- A plate of length 4m in the direction of the flow and of width 2m is pulled at a speed of 108 km/h in water at 15oC find the power needed against the shear force for one side of the plate . b- oil with dynamic viscosity=0.1 N-s/m2 and density=863 kg/m3 flows between 2 parallel plates 2.5 mm apart and inclined 30 degrees to the horizontal at a rate of 300 cm3/s per one meter of width. Calculate the...
A Parabolic trough concentrator with width of 3 m and length of 25 m has an...
A Parabolic trough concentrator with width of 3 m and length of 25 m has an absorbed solar radiation per unit area of aperture of 600 W/m2. The receiver is a cylinder with an emittance of 0.3 and is surrounded by an evaluated glass cylindrical envelope. The absorber has a diameter of 50 mm and the transparent envelope has an outer diameter of 100 mm with a thickness of 5 mm. The collector is designed to heat a fluid entering...
Consider a counter-flow plate HX with channels of 12 in length, 6 in width, and 3/8...
Consider a counter-flow plate HX with channels of 12 in length, 6 in width, and 3/8 in thickness. The heat exchanger consists of three flow channels with air at 200oC entering the center channel, and air at 25oC entering the 2 outer channels, above and below the center channel. The center channel has a flow rate of 3 x 10-4 m3/s and the outer two channels have a flow rate of 1.67 x 10-4 m3/s in each channel. The plates...
A smooth flat plate of length ℓ = 4 m and width b = 2 m...
A smooth flat plate of length ℓ = 4 m and width b = 2 m is placed in water with an upstream velocity of U = 0.1 m/s. 1) Is the flow laminar or turbulent? 2) Determine the boundary layer thickness at the center and the trailing edge of the plate. 3) Determine the wall shear stress at the center and the trailing edge of the plate.
Air at a pressure of 1 atm and a temperature of 15C is in parallel flow...
Air at a pressure of 1 atm and a temperature of 15C is in parallel flow at a velocity of 10 m/s over a 3-m long flat plate that is heated to a uniform temperature of 140 C. (a) What is the average heat transfer coefficient and heat transfer rate for the plate? (b) What is the local heat transfer coefficient and heat flux at the midpoint of the plate? (c) Plot the variation of the heat flux with distance...
A long 8-cm-diameter steam pipe whose external surface temperature is 90°C passes through some open area...
A long 8-cm-diameter steam pipe whose external surface temperature is 90°C passes through some open area that is not protected against the winds. Determine the rate of heat loss from the pipe per unit of its length when the air is at 1 atm pressure and 7°C and the wind is blowing across the pipe at a velocity of 47 km/h. The properties of air at 1 atm and the film temperature of (Ts + T∞)/2 = (90 + 7)/2...
Question 3 Part A An aluminium saucepan containing 1 kg of water is heated by a...
Question 3 Part A An aluminium saucepan containing 1 kg of water is heated by a hot plate as shown in the figure below. The pan has a cylindrical shape, with a radius of 15 cm. The thickness of the aluminium section at the bottom is 10 mm. The air temperature is 25 degrees celsius, and water temperature in the pan is uniform at 100 degrees celsius. a. Calculate the heat transfer rate via convection at the water surface. b....
Consider the vertical rear window of an automobile that has a thickness L= 9 mm and...
Consider the vertical rear window of an automobile that has a thickness L= 9 mm and height H=0.5 m with heating wires that create uniform volumetric heating. The window interior is exposed to ambient air at 10°C and the window exterior to air at -10°C which moves in parallel flow over the surface with a velocity of 20 m/s. The surface temperature of the window exterior is 12°C. Using the correlation developed by Churchill and Chu, find the convective heat...
4.1A membrane made of 0.1 mm thick soft rubber separates pure O2 at 1 atm and...
4.1A membrane made of 0.1 mm thick soft rubber separates pure O2 at 1 atm and 25oC from air at 1.2 atm pressure. Determine the mass flow rate of O2 through the membrane per unit area and the direction of flow. Molar flow rate of oxygen is given by: ???? = ???????? / ??? (????1 ? ????2 ) where S is solubility of oxygen in rubber. The mass diffusivity of oxygen in rubber at 298 K is DAB = 2.1...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT