In oil and gas and geothermal installations, open channels followed by sieves for removal of drill cuttings, are used to monitor the quality and quantity of the drilling fluids. Drilling fluid flow rate is difficult to measure due to the varying flow conditions (e.g., wavy, turbulent and irregular) and the presence of drilling cuttings and gas bubbles. Inclusion of a Venturi section in the open...

Water is mixed with the crude oil to form complex multiphase fluid during extraction process. Some of traditional methods measure relative amount water (known as water-cut or WC) are intrusive, which prone wear and tear. Few other methods, used for WC sensing, either unable cover full range (0-100% require good mixing production be sensed accurately. This paper presents a unique robust design d...

A new structure is proposed for a DN25-type ultrasonic gas flow meter with V-shape double sound channel arrangement. The field characteristics are analyzed including velocity curves the four lines, profiles different cross-sections of meter, and streamlines transducer sections. metering flowmeter measured using Venturi nozzle device. When pipeline rate less than 2.26 m/s, pipe installation does...

Venturi injector is widely used in fertigation system due to its obvious advantages such as cheap and robust system without mobile pieces, simple structure, convenient to operation, stable performance, needless of external energy for operation etc. At present, the hydraulic parameters such as suction capacity (injection rate) for the most of the Venturi injectors produced domestically are not v...

In principal component regression there is a problem of selecting the number of principal components to be retained in the model. Those principal components corresponding to near-zero eigenvalues can ruin the precision of the regression coefficients estimator and therefore must be eliminated from the model. However, when the eigenspectrum gradually decays, it is difficult to decide how many pri...

Fixed performance venturi devices should provide a predetermined oxygen concentration at an outflow which exceeds an adult's peak resting inspiratory flow rate (approximately 30 l.min(-1)). Campbell's original description mentioned the sensitivity of the venturi device to downstream resistance but gave no further details. This study examined outflow and oxygen concentration from the five standa...