Air at atmospheric pressure and 27°C enters a 12-m-long, 1.5-cm-ID tube with a mass flow rate of 0.1 kg/s. The tube surface is maintained at a uniform temperature of 90°C. Calculate the average heat transfer coefficient and the rate of heat transfer to the air.
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Air at atmospheric pressure and 27°C enters a 12-m-long, 1.5-cm-ID tube with a mass flow rate
of 0.1 kg/s. The tube surface is maintained at a uniform temperature of 90°C. Calculate the average heat
transfer coefficient and the rate of heat transfer to the air.
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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?Consider a 25-mm-diameter and 15-m-long smooth tube that is maintained at a constant surface temperature. Fluids enter the tube at 50°C with a mass flow rate of 0.01 kg/s. Determine the tube surface temperatures necessary to heat water, engine oil, and liquid mercury to the desired outlet temperature of 150°C.
- Air 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?Liquid glycerin is flowing through a 25-mm-diameter and 10-m-long tube. The liquid glycerin enters the tube at 10°C with a mass flow rate of 0,2 kg/s. If the outlet mean temperature is 60°C and the tube surface temperature is constant, determine the surface temperature of the tube.Consider a 25-mm-diameter and 15-m-long smooth tube that is used for heating fluids. The wall is heated electrically to provide a constant surface heat flux along the entire tube. Fluids enter the tube at 50°C and exit at 150°C. If the mass flow rate is maintained at 0.01 kg/s, determine the convection heat transfer coefficients at the tube outlet for water, engine oil, and liquid mercury.
- Air at 1 atmosphere and a temperature of 60f enters 1/2-in. id tube with a velocity of 80 fps. The wall is maintained at a constant temperature of 210 by condensing steam. Fin the convective heat-transfer coefficient for this situation if the tube is 5ft longWhat does the logarithmic mean temperature difference represent for flow in a tube whose surface temperature is constant? Why do we use the logarithmic mean temperature instead of the arithmetic mean temperature?Water with a mass flow rate of 0.002 kg/s at 18oC flows inside a tube while the flow is already developed hydrodynamically. The inner diameter of the tube is 1.5 cm, and the inner pipe wall temperature is maintained uniformly at 125oC. Calculate the required tube length to increase the water temperature to 82oC.
- In a manufacturing plant that produces cosmetic products, glycerin is being heated by flowing through a 25-mm-diameter and 10-m-long tube. With a mass flow rate of 0.5 kg/s, the flow of glycerin enters the tube at 25°C. The tube surface is maintained at a constant surface temperature of 140°C. Determine the outlet mean temperature and the total rate of heat transfer for the tube. Evaluate the properties for glycerin at 30°C.One house owner with a pond on his property has decided to use the pond water to cool his house. His idea is to flow air through a thin smooth 10-cm-diameter copper tube that could be submerged into the pond. The water in the pond, at few meters below the surface is typically maintained at a constant temperature of 15°C. If he assumes the air (~1 atm) entering the copper tube at a mean temperature of 30°C with an average velocity of 2.5 m/s, determine the necessary copper tube length that would be needed so that the outlet mean temperature of the air is 20°C. You may consider the convection heat transfer coefficient of 1000 W/m2·K on the outer surface of the copper tube, between the pond water and copper tube. Since the copper tube is thin, the conduction resistance of the tube wall may be neglected.Liquid water flows in a circular tube at a mass flow rate of 0.006 kg/s. The water enters the tube at 5°C, and the average convection heat transfer coefficient for the internal flow is 20 W/ m2⋅K. The tube is 3 m long and has an inner diameter of 25 mm. The tube surface is maintained at a constant temperature. The inner surface of the tube is lined with polyvinylidene chloride (PVDC) lining. According to the ASME Code for Process Piping, the recommended maximum temperature for PVDC lining is 79°C. If the water exits the tube at 15°C, determine the heat rate transferred to the water. Would the inner surface temperature of the tube exceed the recommended maximum temperature for PVDC lining? The specific heat of water at the bulk mean temperature of Tb = (Ti + Te)/2 = (5 + 15)°C/2 = 10°C is cp = 4194 J/kg·K. The heat transfer rate to the water is ______ W. The inner surface temperature of the tube is _____ (above/below) the maximum temperature for PVDC lining.