New approximation of friction factor developed for general gas-flow equation

Pipeline Design Tools - 1A new equation for accurate approximation of the Moody friction factor in the general gas-flow equation better approximates a wide range of Reynolds numbers than previously published equations. Other, less-accurate explicit approximations to the Moody friction factor have been widely used because they allow the gas-flow equation to be solved directly instead of iteratively. For actual computation of the best values of design variables, it is necessary to express a gas-flow equation and consequently a friction-factor equation that are valid for all practical operating conditions.The older empirical gas-flow equations have used various coefficients and exponents for...

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