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Fluid Metrology Group

Welcome
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The Fluid Metrology Group provides calibration services for measuring liquid and gas flow, airspeed, liquid density, and volume. The Group develops models, reference data, and novel techniques for improved measurements of flow, temperature, and pressure, and uses acoustic techniques to determine the thermodynamic and transport properties of gases. The Group has encouraged the accurate calculation of the thermophysical properties of helium and argon from quantum mechanics as well as the use of the calculated properties as standards to calibrate instruments that measure flow, viscosity, thermal conductivity, dielectric constant, speed of sound, and the equation of state.

Programs/Projects

Transient Flow Facility—Today, demonstration vehicles are refueled with hydrogen from dispensers within 3 to 5 minutes using sequential gas releases from a bank of pressurized cylinders. The sequential releases generate …

Smoke Stack Simulator—Today, inconsistencies between measured CO2 emissions and emissions calculated from coal consumption are on the order of 10% to 20%. Either a carbon tax or cap-and-trade regulations will generate a …

Gas properties for flow metering—Flow meters that rely on measuring the pressure drop across a laminar flow element can be accurately calibrated using a benign surrogate gas (such as helium or nitrogen) and then used to meter …

Acoustic Techniques in Fluid Metrology—The Fluid Metrology Group leads the world in designing and using gas-filled acoustic resonators for measuring the thermodynamic temperature T, the Boltzmann constant kB, and the thermophysical …

Understanding Flow Meters—Accurate flow measurements are needed for test fluids, temperatures, pressures, flows, and installation conditions that differ from those used during NIST’s calibrations; therefore, we strive to …

Air Speed Metrology—NIST’s versatile wind tunnel is used to calibrate customers’ air speed sensors and to conduct research on the design of novel anemometers, the responses of anemometers to pitch, yaw, turbulence, …