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Reynolds Number for Gas

   

Reynolds Number for Gas Formula

\( Re_g \;=\;  20,100 \cdot \dfrac{ SG_g \cdot Q }{ d \cdot \eta } \)     (Reynolds Number for Gas)

\( SG_g \;=\;  \dfrac{  Re_g \cdot d \cdot \eta  }{ 20,100 \cdot Q }\)

\( Q \;=\;  \dfrac{ Re_g \cdot d \cdot \eta  }{ 20,100 \cdot SG  }\)

\( d \;=\; \dfrac{ SG_g \cdot Q \cdot 20,100 }{ Re_g \cdot \eta  }\)

\( \eta \;=\;  \dfrac{ SG_g \cdot Q \cdot 20,100 }{ Re_g \cdot d }\)

Symbol English Metric
\( Re_g \) = Reynolds Number \( dimensionless \) \( dimensionless \)
\( SG_g \) = Gas Specific Gravity Relative to Water (water = 1) \( dimensionless \) \( dimensionless \) 
\( Q \) = Gas Flow Rate \(ft^3\;/\;sec\) \(m^3\;/\;s\)
\( d \) = Pipe Inside Diameter \( in\) \( mm \)
\( \eta \)  (Greek symbol eta)  = Gas Viscosity \(lbf - sec\;/\;ft^2\) \(Pa-s\)

 

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