For the inlet conditions of Example 6.2, what is the maximum length of pipe that may be

Question:

For the inlet conditions of Example 6.2, what is the maximum length of pipe that may be used if the pipe is 2 in. in diameter? What is it for the inlet conditions of Example 6.3?

Example 6.2

Air flows from a reservoir through an isentropic nozzle into a long-straight pipe. The pressure and temperature in the reservoir are 20 atm and 1,000°R (555.6 K), respectively, and the Mach number at the entrance of the pipe is 0.05;

(a) What is the value of ƒ̅L_max/r_H?

(b) What are the pressure, temperature, density, 1incar velocity, and mass velocity when L_b= L_max?

Example 6.3

Air at 1.7 atm gauge and 15°C enters a horizontal 75-mm steel pipe that is 70m long. The flow rate of the entering air q is 0.265 m³/s. Assuming isothermal flow, what is the pressure at the discharge end of the pipe?

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