Reynolds Number for Gas

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Reynolds Number for Gas Formula

\( Re_g \;=\; 20,100 \; ( SG_g \; Q \;/\; d \; \eta ) \)     (Reynolds Number for Gas)

\( SG_g \;=\;  Re_g \; d \; \eta  \;/\; 20,100 \; Q \)

\( Q \;=\;  Re_g \; d \; \eta  \;/\; 20,100 \; SG  \)

\( d \;=\; SG_g \; Q \; 20,100 \;/\; Re_g \; \eta  \)

\( \eta \;=\;  SG_g \; Q \; 20,100 \;/\; Re_g \; d \)

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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Tags: Heat Transfer Flow Gas Orifice and Nozzle Pipeline