Question

Which of the following formulas is used for determining the circulation rate (R) in recirculation degassing?

(a) R = 1.42*10^3*Q^1/3*d^1/3*{ln(P1/P2)}

(b) R = 2.42*10^3*Q^1/3*d^1/3*{ln(P1/P2)}

(c) R = 5.14*10^3*Q^1/3*d^1/3*{ln(P1/P2)}

(d) R = 7.42*10^3*Q^1/3*d^1/3*{ln(P1/P2)}

I had been asked this question in quiz.

I'm obligated to ask this question of Methods and Materials for Degassing topic in division Foundry Introduction & Materials of Casting-Forming-Welding II

Answer 1

Correct choice is (d) R = 7.42*10^3*Q^1/3*d^1/3*{ln(P1/P2)}

Best explanation: The circulation rate (R) in recirculation degassing is given by-

R = 7.42*10^3*Q^1/3*d^1/3*{ln(P1/P2)} , where R is the circulation rate in Kg/sec, Q is the injection rate of argon gas, P1 is the pressure at the base, P2 is the pressure in the vacuum chamber and D is the internal diameter.