Air enters a 100 meter long duct at 300K and 4 bars with a velocity of 34.7m/s. The duct diameter is 5cm. What is the heat transfer needed, in kJ/kg, for the flow to choked?
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- A saturated steam at 410K is being transported in a pipeline (brass drawing tubing) at a rate of 1 grams/second. Pipe has inside diameter of 0.025 m . The tube is 100m long. The pressure at the entrance is 80kPa. What is the value of G in kg/s.m2?. (use Perry's Handbook for the properties and constants) R = 8314J/kgmol.K; MW=18.02g/molQ: Air enters a rectangular duct. Determine the exit temperature of the air and find the rate of heat transfer loss . Taking k = 0.02662 W/m."C. v= 1.702x10 m'/s, Pr 0.7255, C-1007 J/kg. C ,p=1.127 kg/m u= 2.325 kg/m.s Ans : 34.2°C 3776 W Air dact 15 em 2 em L7m Q. Hot air enters a sheef metal duct located in a basement. Determine* Hot air enters a sheet metal đuct located in a basement. Determine the exit temperature and the rate of heat loss. Taking k 0.02735 W/m. C, v= 1.797x10 m'/s. Pr 0.7228, C-1007 J/kg.C ,pD MSc. Rasha Nasser 106 1.092 kg/m' H= 2.325 kg/m.s and e = 0.3 Ans: 45.1 °C, 2622 W Air dust 20 cm - 20 em Air L-12 m
- Air enters a duct (100 cm *10 cm*10 cm) at 32°C at a rate of 0.28 m/min to cool 138 W electronic component placed on the duct. Assuming 85 percent of the heat generated inside is transferred to air flowing through the duct and the remaining 15 percent is lost through the outer surfaces of the duct. What is the convective heat transfer coefficient (W/m2.°C), Assume fully developed flow for the whole channel length and (if flow is NOT Laminar use Dittus-Boelter equation:Nu=0.023 Re0.8Pr") E1007 J/kg.°C, v =1,654×10 m /s, p = 1.146 kg/m Pr= 0.7268, k = 0.02625 W/m. °C Select one:. Oil enters a 1.25-cm diameter,3-m long tube at 38°C. The tube wall is maintained at 66°C, and flow velocity is 0.3 m/s. What is the total heat transfer to the oil and oil exit temperature? Assume an exit temperature of 50°C. Temperature (°C) p(kg/m³) u (kg/m sec) Cp J/hg °C) k(W/m °C) 0.210 0.0725 0.0320 40 0.144 867.05 864.04 1964 60 2047 0.140 80 852.02 2131 0.138A 4.5 in (inside diameter), 4.9 in (outside diameter) tube carries dry saturated steam at 10 bar. Assume that the interior temperature of the tube is the same as that of the steam. The outside air temperature is 25°C. For ksteel = 51.9 W/(m K) and hair = 13.0 W/(m2K). a) How much energy is lost, in kWh, in a 20 m long section of pipe during an 8-hours
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- In quantity flow measurement using pitot tube, is it necessary to get the average velocity? Why?Water at a temperature of 20 oC with a mass flow rate of 0.015 kg/s enters the pipe 2.5 cm in diameter with a uniform surface temperature of 90 oC. a) Determine the length of the thermal inlet region, Lt.b) If it is assumed that the flow is hydrodynamically and thermally formed, calculate the convection heat transfer coefficient and the length of the pipe required to heat the water to 70 oC.c) What is the rate of heat transfer to the water?d) Calculate the friction factor and pressure drop.1. A lead pipe has 2 cm inside diameter, 3 cm outer diameter, length of 130 cm. Liquid water at 4°C flows through the pipe with a bulk velocity of 2.50 km/hr. Air is blown around the outside of the pipe at 20 deg C. The inside wall of the said pipe has a temperature of 8 deg Celsius. Find: a. Overall heat coefficient (U) based on outside surface area b. Prandtl (Pr) and Reynolds (Re) numbers based on classification of flow