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Chapter 8 Solutions
Fundamentals of Heat and Mass Transfer
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- An oil has 0.62 inch steel tube, through which flows an oil. The properties of oil are as follows; μ = 0.034 lbs/ft-sec, μb = 0.044 lbs/ft-sec, μw = 0.004 lbs/ft-sec, and specific gravity at 60°F is 0.899. The oil neters at a temperature of t1 = 60°F and flows with an average velocity of 4 ft/sec. The inside surface area is 0.1613 ft2 per foot length, and the inside sectional area is 0.3019 in2. The length of one pass of the tube is 10 feet. Considering steam at 215°F surround the tubes. Assume that the inside surface temperature of the pipe is 210°F and a bulk temperature of 72°F. If the specific heat of oil is 0.5 btu/lbs-°F and its conductivity k = 0.08 Btu-ft/hr-°F-ft2, what is the temperature at the end of 10 feet pass. Answer: t = 61.18 °F Show the complete solution.arrow_forwardAir is flowing through a 21.79-cm diameter pipe with a velocity of 6.23 m/s. If the temperature of the air is 21.27°C and pressure is 104 kPa compute the flow rate of air in the pipe in kg/s.arrow_forwardAn oil has 0.62 inch steel tube, through which flows an oil. The properties of oil are as follows; μ = 0.034 lbs/ft-sec, μb = 0.044 lbs/ft-sec, μw = 0.004 lbs/ft-sec, and specific gravity at 60°F is 0.899. The oil neters at a temperature of t1 = 60°F and flows with an average velocity of 4 ft/sec. The inside surface area is 0.1613 ft2 per foot length, and the inside sectional area is 0.3019 in2. The length of one pass of the tube is 10 feet. Considering steam at 215°F surround the tubes. Assume that the inside surface temperature of the pipe is 210°F and a bulk temperature of 72°F. If the specific heat of oil is 0.5 btu/lbs-°F and its conductivity k = 0.08 Btu-ft/hr-F-ft2, what is the temperature at the end of 10 feet pass. Show your complete solution and illustration.arrow_forward
- The fluid condition at the inlet and exit of a horizontal convergent nozzle is analysed. The nozzle is operating steadily and heat loss is assumed negligible. If the specific enthalpy of fluid and velocity of fluid at the inlet are 3,351 kJ/kg and 298 km/hr respectively. At the exit the specific enthalpy of fluid is 2,619 J/kg. Calculate the exit area (in mm2)of the nozzle when the specific volume at the nozzle exit is 0.61 m3/kg at the inlet area of 0.23 m2 and the specific volume at the inlet is 0.33 m3/kg. You do not need to include the unit for this question.arrow_forwardA computer cooled by a fan contains eight printed circuit boards (PCBs), each dissipating 10 W of power. The height of the PCBs is 12 cm and the length is 18 cm. The clearance between the tips of the components on the PCB and the back surface of the adjacent PCB is 0.3 cm. The cooling air is supplied by a 10-W fan mounted at the inlet. If the temperature rise of air as it flows through the case of the computer is not to exceed 10°C, determine (a) the flow rate of the air that the fan needs to deliver, (b) the fraction of the temperature rise of air that is due to the heat generated by the fan and its motor, and (c) the highest allowable inlet air temperature if the surface temperature of the components is not to exceed 70°C anywhere in the system. As a first approximation, assume flow is fully developed in the channel. Evaluate properties of air at a bulk mean temperature of 25°C. Is this a good assumption?arrow_forwardA liquid metal flows at the rate of 4kg/s through a constant heat flux 6cm inner diameter tube in a nuclear reactor. The fluid at 200 oC is to be heated with the tube wall 40 oC above the fluid temperature. Determine the length of the tube required 25 oC rise in bulk fluid temperature. Using the following properties: ρ = 7700 kg/m3 , Y = 8*10-8 m2/s , Pr=0.011 , Cp= 130 J/kg.K , k=12W/mk. please can you solve it with keyboard,take your time heat transfer, J.P.Holman .arrow_forward
- An incompressible fluid flows through a rectangular cross section duct, with width much larger than height of the cross section. The duct surface is heated at a uniform rate along its length. If the centreline of the flow is along the centre of the duct where y = 0, the distance from the centreline to the surface of the duct is b = 25 mm, and the thermal conductivity of the fluid is 0.6 W/mK, what is the local heat transfer coefficient in the developed region of the flow? Give your answer in W/m2K to 1 decimal place. I AM POSTIING THIS AGAIN. PLEASE STOP ? COPY FROM INTERNET AND SEND RANDOM SOLUTION. HINT THE FINAL ANSWER IS 38.4 But i need step by step solution. if you don't get this value don't send it please, reject and add the creditarrow_forwardAn incompressible fluid flows through a rectangular cross section duct, with width much larger than height of the cross section. The duct surface is heated at a uniform rate along its length. If the centreline of the flow is along the centre of the duct where y = 0, the distance from the centreline to the surface of the duct is b = 25 mm, and the thermal conductivity of the fluid is 0.6 W/mK, what is the local heat transfer coefficient in the developed region of the flow? Give your answer in W/m2K to 1 decimal place.arrow_forwardAir at atmospheric pressure enters a heating duct with dimensions of 3 x 6 in. The air enters the 16 ft long duct with a temperature of 32 F, and the duct surface is maintained at 150 F. If the air exit temperature is to be 68 F, what is the air flow, in lb/hr? (answer in whole number) For air, R = 53.342 ft-lbf/lbm-R, k = 0.173 Btu-in/ft2-hr-F, and cp = 0.24 Btu/lbm-arrow_forward
- Petrol of specific gravity 0.85 is to be pumped through a 1.2 km pipeline to a petrol station. The pipeline is 150 mm in diameter and is on a horizontal plane. The station serves 1 000 drivers per day. Each driver requires 41.4 litres of petrol daily. The pumping to the petrol station is carried out daily between 6:00 am - 6:30 am. The pump that delivers the petrol to the petrol station requires 7 kW to drive it and operates at 65%. Use the information given to calculate the kinematic and dynamic viscosities of the petrol. Assume the flow is laminar and hence confirm that it is indeed laminararrow_forwardWater is to be heated from 15 C to 65 C as it flows through a 3 cm internal diameter 5 m long tube. The tube surface is subjected to uniform heat flux. If the mean water velocity is 0.236 mm/s, determine 1. The total heat transferred to water. 2. The inner surface temperature of the pipe at the inlet and the exit. Take water properties p=992.1 kg/m³, v 0.658 x 10-6 m²/ s Cp=4179 J/kg.K, Pr-4.32, Nu= 0.023Re08Prº.4 k=0.631 W/m.°C,arrow_forwardThe fluid condition at the inlet and exit of a horizontal convergent nozzle is analysed. The nozzle is operating steadily. and heat loss is assumed negligible. If the specific enthalpy of fluid and velocity of fluid at the inlet are 3,089 kJ/kg and 229 km/hr respectively. At the exit the specific enthalpy, of fluid is 2,569 J/kg. Calculate the exit area (in mm2)of the nozzle when the specific volume at the 3 nozzle exit is 0.63 m/kg at the inlet area of 0.2 m2 and the specific volume at the inlet is 0.31 m3/kg. You do not need to include the unit for this question.arrow_forward
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