Air (its gas constant is 287 J/kg.k) escapes from a tank at a temperature of 55 0C and specific internal energy of u= 3588 J/kg, what will be its enthalpy (J/kg)?
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Air (its gas constant is 287 J/kg.k) escapes from a tank at a temperature of 55 0C and specific internal energy of u= 3588 J/kg, what will be its enthalpy (J/kg)?
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- Air enters a constant-area duct at p1 = 90 kPa, V1 =520 m/s, and T1 = 5588C. It is then cooled with negligiblefriction until it exits at p2 = 160 kPa. Estimate (a) V2,(b) T2, and (c) the total amount of cooling in kJ/kg.A tank volume 9 contains gas at conditions ( ρ 0 , p 0 , T 0 ). Attime t = 0 it is punctured by a small hole of area A . The mass fl ow out of such a hole is approximately proportional to A and to the tankpressure. If the tank temperature is assumed constant andthe gas is ideal, fi nd an expression for the variation ofdensity within the tankA vessel of capacity 7.5 m3 contains the mass of 8 kg of Oxygen gas at a pressure of 180000 N/m2 and a temperature of 338 K. Find the gas constant of Oxygen gas in J/kgK. Gas constant, (J/kgK) =
- As2...Suppose that we could increase the atmospheric pressure on the surface of Mars to 0.2 bar, by vaporizing the polar caps and subsurface ice. This atmosphere would then likely decrease over time, as a result of several processes, such as escape into space, and erosion by the solar wind. How would the surface pressure decrease as a function of time? How much time would it take until the pressure is only 0.1 bar?Fluid mechanical A large vessel contains compressed air at To = 350 K and Po = 2 bar. A converging-diverging nozzle is attached to the vessel to discharge air. The throat area of the nozzle is 200 cm2. At the exit, the pressure is 20 kPa and the flow is supersonic. Answer the followings: The mass flow rate of the air = Mach number at exit = he exit are = Air velocity at exit Air velocity at throat = Air pressure at throat =For first law thermodynamics , Q-W = E where E is the change in total energy. My question is when should we use q-w = h2-h1 when h is the change in epecific enthalpy and q-w = u2-u1 and u isthe change in specific internal energy?