A liquid-independent volume flow measurement principle
| Autor: | T P M Hunter, A W F Volker, L F G Geers |
|---|---|
| Přispěvatelé: | TNO Industrie en Techniek |
| Rok vydání: | 2010 |
| Předmět: |
Materials science
Physics-based Thermodynamics Measurement principle Flow measurement Time of flight Volume flow Range (statistics) Calibration Position control A-thermal Non-intrusive Instrumentation Engineering (miscellaneous) Laser sources Working range TS - Technical Sciences Industrial Innovation laboratory equipment applications Fluid Mechanics Chemistry & Energetics Physics User calibration Applied Mathematics Measurements Root mean squares Liquids Mechanics Mixture compositions Isopropyl alcohols Theoretical values Time interval Volumetric flow rate Flow (mathematics) Mixtures Measuring principle Temperature drifts Flow channels Flowmeters Test rigs Laboratory equipments Pure water PID - Process & Instrumentation Development |
| Zdroj: | Measurement Science and Technology, 7, 21 |
| ISSN: | 1361-6501 0957-0233 |
| DOI: | 10.1088/0957-0233/21/7/074001 |
| Popis: | A novel flow measurement principle is presented enabling non-intrusive volume flow measurements of liquids in the ml/min range. It is based on an opto-acoustical time-of-flight principle, where the time interval is recorded in which a thermal label travels a known distance through a flow channel. Big advantages are the insensitivity to temperature drift and the fact that user calibration is unnecessary. The paper presents a set of physics-based criteria that define the working range of the measurement principle. A prototype of a flow meter was developed and evaluated in a test rig with flows of water, isopropyl alcohol (IPA) and mixtures of both liquids. Pure water and IPA flows of 0.1 to 2 ml min-1 were measured and found to coincide with the reference flows within 4%. The root-mean-square (RMS) value of the fluctuations did not exceed 3%. For flows of 2 ml min-1 the limited power of the laser source caused deviations of 7% with 5% fluctuations. Finally, flow measurements were done in water-IPA mixtures with concentrations between 10% and 90%-w/w at a flow rate of 15 g h-1 (≈0.3 ml min-1). The ratio of measured and reference flow appeared to be 4% to 5% below the theoretical value, but it was hardly a function of mixture composition. Hence, liquid independence of the measurement principle was proven. © 2010 IOP Publishing Ltd. |
| Databáze: | OpenAIRE |
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