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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_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 3,351 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 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
- Need asaparrow_forwardPetrol 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_forwardAn oil cooler consists of a system of nested identically centered pipes. The inner tube of this cooler has an inner diameter of 1.4 cm and a thickness of 0.2 cm. The outer surface of the cooler is insulated. The oil flows through the inner pipe at a speed of 4.0 kg/min, and the cooling water flows between the two pipes at a speed of 5.0 kg/Dec in the OPPOSITE direction to the oil flow. The hot oil is cooled from 400 OC to 180 OC. The cooling water inlet temperature is 18 OC. The film heat transfer coefficient between the surface of the pipe with oil 2100 W/m2 K heat transfer coefficient between the film and the surface with water 4070 W/m2 K is the pipe thickness of the heat transfer resistance is neglected. Calculate the length of the heat exchanger to be used. Cp water=1 cal/g oC; Cp,oil=1727 J/kg oCarrow_forward
- Air with ρ = 1,202 kg/m3 and ν =15.1 x 10-6 m2/s, is flowing steadily in a duct shown in Figure 1 that is made of stainless steel. To maintain the flow under laminar, determine the following; 1.1 the maximum airflow rate, and 1.2 the fan power required to overcome the pressure losses in this section of the duct.arrow_forwardA liquid metal flows at a mass rate of 3 kg/s through a constant heat flux 5-cm-i.d tube in a nuclear reactor. The fluid at 473 K is to be heated with the tube wall 30 K above the fluid temperature. Determine the length of the tube required for a 1-K rise in bulk fluid temperature, using the following properties: p = 7.7 x 10^3 kg/m^3v = 8.0 x 10^-8 m^2/sCp = 130 J/(kg K)k = 12 W/mKPr = 0.011 Kaufman's correlation: Nu = 0,625.(Re.Pr)0,4arrow_forwardAs 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 marrow_forward
- Consider a pipe carrying water at a temperature of 60°F. The pipe diameter is 4 inches and the water velocity 5.7 ft/s. Will the flow be laminar or turbulent?arrow_forwardWater flows inside the tube 45mm diameter and 3.5 meters long at a velocity 1m/s. Determine the heat transfer coefficient and the rate of heat transfer if the mean water temperature is 50 degree celsius and the tube wall is 70 degree celsius. kfor water is 0.68W/m degree celsius and the kinematic viscocity is 0.478x10^-6 m2/s and the Pr= 2.98. use the Dittus and Boelter equation to solve for Nu.arrow_forwardAn electronic device is cooled by water flowing through capillary holes drilled in the casing as shown in below figure. The temperature of the device casing is constant at 353 K. The capillary holes are 0.3 m long and 2.54x10-3 m in diameter. If water enters at a temperature of 333 K and flows at a velocity of 0.2 m/s, calculate the outlet temperature of the water. 0.3 m 0000000000 Surface Water 333 K 0.2 m/s 2.54 x 10m temperature = 353 K Water Capillary holes Single capillaryarrow_forward
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