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- Liquid ammonia is transported from a production plant to a processing center via a 0.6-m diameter pipeline at a mass flow rate of 0.15 kg/s. Surface temperature of the pipe is maintained 0°C by using a cooling jacket with ice-cold water. Ammonia enters the pipeline at -17°C and exits at -3°C. Assume the flow is both hydrodynamically and thermally fully developed in the pipe. What is the length of the pipe? 185.7mA long aluminum wire of diameter 3 mm is extruded at a temperature of 280°C. The wire is subjected to cross air flow at 20°C at a velocity of 6 m/s. Determine the rate of heat transfer from the wire to the air per meter length when it is first exposed to the air.A 25-mm-diameter hot surface at T = 85°C is cooled by an air jet exiting a 10-mm-diameter round nozzle with a velocity of 60 m/s and temperature of 25°C. The nozzle exit is 25 mm from the hot surface. Determine the percentage change in the average heat transfer coefficient at the hot surface if the air is replaced with carbon dioxide or helium. hco, - hair hair hHe hair hair = i i % ! %
- The forming section of a plastics plant puts out a continuous sheet of plastic that is 1.2 m wide and 2 mm thick at a rate of 15 m/min. The temperature of the plastic sheet is 90℃ when it is exposed to the surrounding air, and the sheet is subjected to air flow at 30℃ at a velocity of 3 m/s on both sides along its surfaces normal to the direction of motion of the sheet. The width of the air cooling section is such that a fixed point on the plastic sheet passes through that section in 2 s. Determine the rate of heat transfer from the plastic sheet to the air. (Answer: 437 W)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 1160.06kg/s of hot air flows through an insulated sheet metal duct of 180 mm Diameter. The air enters the duct at a temperature of 110⁰ and after a distance of 4.5 m gets cooled to a temperature of 70⁰c if the heat transfer officiant between the outer surface of the duct and cold ambient air at 5⁰C is 6.5 w/m²-C calculate the following: a. The heat loss from the duct over its 4.5m at a length of 4.5m b. The heat flux and the duct surface temperature at a length of 4.5m
- As shown in the figure, electrical heaters operating in the V-220 V are placed on the lower surface of the square-shaped horizontal aluminum plate with a length and width of 1.2 m. Air at a temperature of 27 °C flows from the upper surface of the plate in parallel at 15 m/s. Since the bottom surface of the plate is fully insulated, what should the value of the current () passing through the electrical elements be so that the temperature of the plate does not exceed 77 °C? Air Al plate Heaters L=1.2 mThe forming section of a plastics plant puts out a continuous sheet of plastic that is 1.2 m wide and 2 mm thick at a rate of 15 m/min. The temperature of the plastic sheet is 90 °C when it is exposed to the surrounding air, and the sheet is subjected to airflow at 30 °C at a velocity of 2 m/s on both sides along its surfaces normal to the direction of motion of the sheet. The width of the air cooling section is such that a fixed point on the plastic sheet passes through that section in 5 s. Draw the neat figure of the setup and determine the rate of heat transfer from the plastic sheet to the air.Problem 2 A long aluminum wire of diameter 3 mm is extruded at a temperature of 300°C. The wire is subjected to cross air flow at 20°C at a velocity of 6 m/s. Determine the rate of heat transfer from the wire to the air per meter length.
- 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.Water at 15°C is to be heated to 65°C by passing it over a bundle of 4-m-long, 1-cm-diameter resistance heater rods maintained at 90°C. Water approaches the heater rod bundle in normal direction at a mean velocity of 0.8 m/s. The rods are arranged in-line with longitudinal and transverse pitches of SL=4 cm and ST=3 cm. Determine the number of tube rows NL in the flow direction needed to achieve the indicated temperature rise. Please, I need the solution from fundamental concepts of how the heat flow behaves in the system. That it be answered with theory of the subjectA plate with a negligible thickness of 50 cm in width and 100 cm in length and from its upper surface, it is exposed to 2 different airflows in the same direction along its length. top of the sheet The speed of the air flowing from its surface is 3600 m/min and its temperature is 473 K. Its temperature is 298 K and its speed is 600 m/min. The total heat exchange between both fluids calculate. (Assume the initial temperature of the plate is 160⁰C.)