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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»

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.


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