Question

A concrete cylinder (0.1 m length, 0.1 m diameter) is initially at room temperature. It is...

A concrete cylinder (0.1 m length, 0.1 m diameter) is initially at room temperature. It is suspended in a steam environment, where water vapor at 373 K condenses on the surface with an “h” of 8500 W/m?2K. Determine the time required for the center of cylinder to reach 310 K.

Engineering   Chemical-Engineering   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A long cylinder 11 cm in diameter is initially at a uniform temperature of 427 C...
A long cylinder 11 cm in diameter is initially at a uniform temperature of 427 C and has a density of 7250 kg/m3, thermal conductivity of  16.7 W/m-K, and a specific heat of 540 J/kg-K. The cylinder is suddenly plunged into water with a temperature of 27 C, giving a convective heat transfer coefficient of 380 W/m2-K. a) Determine the surface and centerline temperatures of the cylinder 12 minutes after immersion. b) Calculate the heat transferred from the cylinder during this...
A spherical tank, 1.5 m in diameter, is maintained at a temperature of 120 ◦C and...
A spherical tank, 1.5 m in diameter, is maintained at a temperature of 120 ◦C and exposed to a convection environment with heat transfer coefficient, h=15 W/m2 ◦C and T∞ =20 ◦C. For the same surface temperature of the tank, it is desired to insulate the tank in order to decrease the heat loss by 45 percent, determine the thickness of insulation layer (k=0.2 W/m ◦C ) and the outer surface temperature.
To harden a steel sphere having a diameter of 50.8 mm, it is heated to 1033...
To harden a steel sphere having a diameter of 50.8 mm, it is heated to 1033 K and then dunked into a large water bath at 300 K. Determine the time for the center of the sphere to reach 366.5 K, and the temperature at 10 mm from the centre. The surface coefficient can be assumed as 710 W/m^2.K and k=45 W/m.K and alpha=0.0325 m2/h.
A 20-mm-diameter sphere is suspended in a dry airstream with a temperature of 22ºC. The power...
A 20-mm-diameter sphere is suspended in a dry airstream with a temperature of 22ºC. The power supplied to an embedded electrical heater within the sphere is 2.71 W when the surface temperature is 32ºC. How much power is required to maintain the sphere at 32ºC if its outer surface has a thin porous covering saturated with water? Evaluate the properties of air and the diffusion coefficient of the air–water vapor mixture at 300 K.
A smooth tube 5 cm in diameter and 450 cm in length is placed inside another...
A smooth tube 5 cm in diameter and 450 cm in length is placed inside another tube larger in diameter. Air enters the smaller diameter tube at a pressure of 5 bars, a mean temperature of 16 oC , and at a flow rate of 29 gm/s. saturated steam at 1.523 bar in the annulus between the two tubes condenses on the surface 0f the inside tube find: The outlet temperature of air The outlet pressure of air The mass...
2.1Consider a solid cylindrical rod of length 0.15 m and diameter 0.05 m. The top and...
2.1Consider a solid cylindrical rod of length 0.15 m and diameter 0.05 m. The top and bottom surfaces of the rod are maintained at constant temperatures of 20oC and 95oC, respectively, while the side surface is perfectly insulated. 2.1.1 Draw a diagram to represent the situation described above. (3) 2.1.2 Determine the rate of heat transfer through the rod if it is made of copper, k = 380 W/m? oC. (4) 2.1.3 Determine the rate of heat transfer through the...
A horizontal pipe with an outer surface temperature of 80 * C and an outside diameter...
A horizontal pipe with an outer surface temperature of 80 * C and an outside diameter of 100 mm is located in a room at atmospheric pressure at 20 ° C. Find the required pipe length for the loss of heat from the pipe to 1 kW. (Physical properties for air k = 0.0287 W / mK, Pr = 0.70, v = 19x10-6 m² / s)
A thin-walled metal pipe of diameter 7.50 cm and length 6.20 m is used to transport...
A thin-walled metal pipe of diameter 7.50 cm and length 6.20 m is used to transport 20.0 grams of st eam at 100 O C every second. The pipe is surrounded by insulation with k = 0.0400 W/m-K. How thick must the insulation be if only 0.500% of the steam is allowe d to condense inside the pipe when the external temperature (i.e. outside the pipe) is 20.0 O C? answer is 2.76 cm
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...
A spherical object (50 cm diameter, c=0.46 kJ/kg*C, k = 42 W/m*C, density = 7800 kg/m3...
A spherical object (50 cm diameter, c=0.46 kJ/kg*C, k = 42 W/m*C, density = 7800 kg/m3 ) is initially at a uniform temperature of 450 C. It is suddenly placed in a constant temperature environment of 100 C. The convection transfer coefficient is 500 W/m2*C. How long would it take for temperature in the center of the sphere to cool down to 150 C? Note: Bi for a sphere is (hD)/(6k).Suggestion: First calculate Biot number, then determine if T is...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT