Cold air at 5°C enters a l2-cm-diameter, 20-m-long isothermal pipe at a velocity of 2.5 m/s and leaves at 19°C. Estimate the surface temperature of the pipe.
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Cold air at 5°C enters a l2-cm-diameter, 20-m-long
isothermal pipe at a velocity of 2.5 m/s and leaves at 19°C.
Estimate the surface temperature of the pipe.
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- 6.1 Determine the heat transfer coefficient at the stagnation point and the average value of the heat transfer coefficient for a single 5-cm-OD, 60-cm-long tube in cross-flow. The temperature of the tube surface is , the velocity of the fluid flowing perpendicular to the tube axis is 6 m/s, and the temperature of the fluid is . Consider the following fluids: (a) air, (b) hydrogen, and (c) water.7.43 Liquid sodium is to be heated from 500 K to 600 K by passing it at a flow rate of 5.0 kg/s through a 5-cmID tube whose surface is maintained at 620 K. What length of tube is required?150 L/s of hot air at 80 degrees Ceelsius enters an 8m long uninsulated square duct of cross-section 20 cm x 20 cm and leaves at 70 degree Celsius. The outer surface temperature of duct is observed to be constant. Use Colburn Equation.
- Air (1 atm) enters into a 5-cm-diameter circular tube at 20°C with an average velocity of 5 m/s. The tube wall is maintained at a constant surface temperature of 160°C, and the outlet mean temperature is 80°C. Estimate the length of the tube.Hot air at atmospheric pressure and 85°C enters a 10-m-long uninsulated square duct of cross section 0.15 m * 0.15 m that passes through the attic of a house at a rate of 0.1 m3/s. The duct is observed to be nearly isothermal at 70°C. Determine the exit temperature of the air and the rate of heat loss from the duct to the air space in the attic. Evaluate air properties at a bulk mean temperature of 75°C. Is this a good assumption?What is the length of tubing required to cool air from 80°C to 20°C via an isothermal tube maintained at 0°C? The tube diameter is 20 cm. Mean velocity of air is 4 m/s. Assume the flow to be fully-developed.
- Water flows at 1 kg/s in a 10 mm diameter tube and is to be heated from 25 to 75 ° C. The tube surface temperature is maintained at 100 °C. Using the following properties for the water: p= 998 kg/m?, Cp = 4171 J/kg K, k = 0.651 W/m K, µs = 4.71 x 104 kg/m s, Hw = 2.82 x 104 kg/m s and Pr = 3.02. a) What is the required tube length for these conditions? b) To design a water heating system, consider using tube diameters in the range from 10 to 30 mm. What are the required tube lengths for water flow rate of 1 kg/s? Plot the tube length as a function of tube diameter. c) Plot the pressure gradient as a function of the tube diameter for the given water flow rate of 1 kg/s. Assume tube wall is smooth.Air at 20°C enters a heated circular tube with a diameter of 50 mm and a length of 3 m. The mass flow rate is 0.005 kg/s and the flow is fully developed with h = 40 W/m2. 20°C 0.005 kg/s D q" If the tube is heated by uniform surface heat flux of 1000 W/m?, calculate the surface temperature at the outlet (Ta) in C If the surface heat flux varies linearly in the flow direction as 500x W/m2, (x is in meters and equals to 0 at the inlet and equals to 3 at the outlet) calculate the mean temperature at the outlet (Tm.o) in °C = 128 138 145 152 167 116Air enters a 25-cm-diameter 12-m-long underwater duct at 50°C and 1 atm at a mean velocity of 7 m/s, and is cooled by the water outside. If the average heat transfer coefficient is 85 W/m2?K and the tube temperature is nearly equal to the water temperature of 10°C, determine the exit temperature of air and the rate of heat transfer. Evaluate air properties at a bulk mean temperature of 30°C. Is this a good assumption?
- Air at 1 atmosphere pressure enters a pipe with a 20 mm inner diameter, 1 m length and a constant surface temperature of 93.3 oC at 15.1 oC and leaves the pipe at 60.5 oC. Since the speed of the air is 2.5 m/s, calculate the convective heat transfer coefficient on the inside of the pipe. Test the accuracy by calculating the heat to be transferred.Water flows at 1 kg/s in a 10 mm diameter tube and is to be heated from 25 to 75 ° C. The tube surface temperature is maintained at 100 °C. Using the following properties for the water: p= 998 kg/m?, Cp = 4171 J/kg K, k = 0.651 W/m K, µs = 4.71 x 104 kg/m s, Uw = 2.82 x 104 kg/m s and Pr= 3.02. a) What is the required tube length for these conditions? b) To design a water heating system, consider using tube diameters in the range from 10 to 30 mm. What are the required tube lengths for water flow rate of 1 kg/s? Plot the tube length as a function of tube diameter.Consider the flow of oil (use unused engine oil properties) at 20? in a 30-cm-diameter pipeline at an average velocity of 2 m/s. A 200-m-long section of the pipeline passes through icy waters of a lake at 0?C. Measurements indicate that the surface temperature of the pipe is very nearly 0?C. Disregarding the thermal resistance of the pipe material, determine (a) the temperature of the oil when the pipe leaves the lake, (b) the rate of heat transfer from the oil, and (c) the pumping power required to overcome the pressure losses and to maintain the flow of the oil in the pipe.