Flow rate measurements in turbulent pipe flows with minimal loss of pressure using a defect-law

Abstract

In the paper, a simple and very accurate measurement technique is presented to determine the volumetric or mass flow rate. It is based on the fully-developed turbulent pipe flow, a new analytical universal velocity-profile over the entire pipe section and a single-point measurement. In combination with an optimized straightener this technique has to show minimal pressure loss, very moderate costs and high measuring accuracy compared to LDA-measurements. It is possible to apply the measuring prinicple to nonisothermal gas flows, too.