Air passes along an insulated horizontal pipe of 0.05 m2 cross sectional area. In the pipe it passes over a heating element. It enters at 20 degrees C, 1.013 bar and 3O m/s. Rair = 287 J/kg.K and C,=1005 J/kg.K (a) Determine the mass flow rate of the air. [ Select ] O kg/s
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- Air passes along an insulated horizontal pipe of 0.05 m2 cross sectional area. In the pipe it passes over a heating element. It enters at 20 degrees C, 1.013 bar and 30 m/s. Rair = 287 J/kg.K and C,-1005 J/kg.K (a) Determine the mass flow rate of the air, [ Select] kg/s (b) Determine the temperature of the air at the exit if the pressure is 1.5 bar (you may assume velocity change is negligible) [ Select ] K (c) Determine the rate of heat input ( Select ] kWQ 2. Air at 400°C and 1.7 bar flows through a horizontal 8.2-cm ID pipe at a velocity of 50.0 m/s. I. Calculate Ék (W)? Assuming ideal gas behavior and Mol.Wt (Air)=29 g/mol. I. If the air is cooled to 250°C at constant pressure, what is AER? III. Why would it be incorrect to say that the rate of transfer of heat to the gas must equal the rate of change of kinetic energy?THERMODYNAMICS. Question I. 0.04 kg/s of an ideal gas (molecular weight 30, ratio of specific heats 1.5) flows through a duct with a cross sectional area of 10 cm?. The pressure and temperature are 100 kPa and 350 K. What is the velocity of this gas flow, in m/s?
- dp 1. It shows that the behavior of fluid is A From the equation stated, show the formula for mass flow rate AVp = c. :C.8. Find the Mac number when an aeroplane is flying at 900 km/hour through still air having a pressure of 8.0 N/cm and temperature -15°C. Take k = 1.4 andR= 287 J/kg K. Calculate the pressure, tempera- (Delhi University, 1986) [Ans. 0.776, 11.9 N/cm, 16.06°C, 1.434 kg/m] ture and density of air at the stagnation point on the nose of the plane.|Q4:0 Skg of Steam at pressure of 4.9 bar is produ- ced from uwater at 20%. Determine the amount 0.9 dry. [12263 leg] of heat supplied it the Steam is to o
- Air at pressure P1, temperature T¡, and mass flow rate of m enters a compressor. Air pressure rise over the compressor is APĮ. Water at the same conditions enters a pump and its pressure is raised by the same amount. Compare the required pumping powers for air, W, and for water, W, [Hint. W = APV = APm/p]. aYou are being tasked as a wind tunnel engineer to investigate the performance of newly designed high-speed wind tunnel in UPNM. An exhaust gas flows through a nozzle where the inlet area is 5,000 cm2.At this inlet, the gas has a velocity of 1,200 m/s, temperature of 1,500oC,and pressure of 6,000 kPa. Initial measurement revealed that the pressure at the exit of the wind tunnel is 100 kPa. Based on this information, analyze and investigate ; i. Mach number at inlet of the nozzle ii. The velocity of gas at exit iii. The area of the nozzle at exit Take specific heat ratio for the exhaust gas, ? to be 1.7 and the gas constant, R to be 205 J/kg.B) The air flow to a four cylinder four-stroke engine is 2.15 m³/min. During a test on the engine the following data were recorded: Bore 10.5cm; stroke 12.5cm; engine speed 1200 rpm, torque 150 N.m, fuel consumption 5.5 kg/hr, calorific value of fuel, 43124 kJ/kg, ambient temperature 1-The brake thermal efficiency. and pressure are 20°C and 1.03 barş. Calculate: 2-The brakes mean effective pressure. 3-The volumetric efficiency.
- A circuit board is cooled by passing cool helium, gaș "C= 5193 J/kg.°C, v =1.233×10 m /s, p= 0.1635 kg/m Pr = 0.669, k = 0.1565 W/m.°C " through a channel [0.46 cm ×14 cm×20 cm ] %3D drilled into the board. Helium enters at 15°C and 6.8 m/s and leaves at 63.7 °C. The heat flux at the top surface of the channel can be considered to be uniform, and heat transfer through other surfaces is negligible. What is power rating of the electronic сотponеnts (W? Electronic components, s, Ie Не 15°C L=20 cm Channel Thickness x (Width =14 cm)1) Convert the flow rate of natural gas is = 22.913x106 Sm3/s to m3/s ? Note: the gas export line for transportation of 70 MMSCFD natural gas with a molecular weight of 19.3 relative density of natural gas is 0.67 The ambient temperature is 5°C and the gas viscosity at the average pipeline temperature is 1.1x10-6 cP. The gas inlet temperature is 35°C and pressure is 13.0 MPa (absolute) inside diameter of pipe (190 mm) The total length of pipe is (43 km)5. The total head of a fan is 185 m and has a static efficiency pressure of 210 mm of water gage.What is the velocity of air flowing if the density of air is 1.15 kg per cubic meter? 8. A coal fired steam boiler uses 3000 kg of coal per hour. Air required for combustion is 15.5 kg ofcoal at barometric pressure of 98.2 KPa. The flue gas has temperature of 285 degree Celsiusand an average molecular weight of 30. Assuming an ash loss of 11% and allowable gas velocityof 7.5 meters per second. Find the diameter of the chimney 9. The gas density is 0.75 kg per cubic meters and air density is of 1.15 kg per cubic meter. If thedriving pressure is 0.25 KPA. Determine the height of the chimney. 10. A powerplant situated at an altitude having an ambient air of 96.53 KPa and 23.88 degreeCelsius. Flue gases at a rate of 5.0 kg per second enter the stack at 200 degree Celsius andleaves at 160 degree Celsius. The flue gases gravimetric analysis are 18% CO2, 7% O2 and 75%N2. Calculate the height of…