Flow Rate Formula. The volumetric flow rate of a stream of liquid or gas is equal to the flow velocity multiplied by its the cross-sectional area. Therefore, the formula for flow rate (Q), also known as "discharge rate" expressed in terms of the flow area (A) and its velocity (v) is the so-called discharge equation:Programmable calculator uses equation to figure steady-state gas-pipeline flow Journal Article Holmberg, E - Oil Gas J.; (United States) Because it is accurate and consistent over a wide range of variables, the Colebrook-White (C-W) formula serves as the basis for many methods of calculating turbulent flow in gas pipelines.
The applet works by computing the flow using the one dimensional equations for the isentropic flow of a perfect gas, and the Rankine Hugoniot relations for normal shock waves in perfect gases. You can learn about these relations by reading, form example, Modern Compressible Flow , 2nd Edition, 1990, by John D. Anderson Jr. In the next equations and calculations, gas is assumed as ideal gas but then corrected by correction factors and so ever is assumed equal to actual physical properties of the gas. By any reason, for some cases, compressed gas is also assumed as non ideal gas. Compression process of gas in centrifugal compressor describes with Fig. 5. dh Fig. 5. The steady flow can be taken as incompressible flow under the following conditions, Then it arrives, where . If , holds; , so (is the molecular free path) holds naturally for the continuous medium. So for the steady flow, it can be taken as incompressible flow when , i.e. . In general, the flow will be taken as incompressible flow when .
General gas equation. The ideal gas law is the equation of state of a hypothetical ideal gas. This equation was first stated by French engineer and physist Emile Clapeyron (1799-1864) in 1834 as a combination of three empirical gas laws proposed by Robert Boyle, Joseph Louis Gay-Lussac, and Amedeo Avogadro. This equation will give you the powers to analyze a fluid flowing up and down through all kinds of different tubes. ... Volume flow rate and equation of continuity. Use the Panhandle A equation to calculate gas flow rate through a pipe with known diameter and length, elevation difference between pipeline inlet and outlet, specified inlet and outlet pressure and enough information to calculate gas properties.