The Experts below are selected from a list of 270 Experts worldwide ranked by ideXlab platform
Toshiharu Kagawa - One of the best experts on this subject based on the ideXlab platform.
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a concentration measurement system for binary gas mixtures using two Flowmeters
Measurement Science and Technology, 2007Co-Authors: Shunpei Yamazaki, Tatsuya Funaki, Kenji Kawashima, Toshiharu KagawaAbstract:A system has been constructed for measurement of the gas concentration in a binary gas mixture and of the total flow rate of the gas mixture, using a venturi Flowmeter and a laminar Flowmeter. The flow rate and air concentration in tested gas mixtures, consisting of air and carbon dioxide or helium, are measured. The results are compared with reference values and the obtained results are found to be similar to those obtained using existing Flowmeters and concentration meters. The response of the system to the flow rate and the mixing ratio change is tested. The flow rate change response is approximately equivalent to existing Flowmeters, and the concentration change response is better than for existing meters.
Chuan Ding - One of the best experts on this subject based on the ideXlab platform.
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a high pressure bi directional cycloid rotor Flowmeter
Sensors, 2014Co-Authors: Fan Ding, Chuan DingAbstract:The measurement of the flow rate of various liquids and gases is critical in industrial automation. Rotary positive displacement meters (rotary PD meters) are highly accurate Flowmeters that are widely employed in engineering applications, especially in custody transfer operations and hydraulic control systems. This paper presents a high pressure rotary PD meter containing a pair of internal cycloid rotors. It has the advantages of concise structure, low pressure loss, high accuracy and low noise. The curve of the internal rotor is designed as an equidistant curtate epicycloid curve with the external rotor curve as its conjugate. The calculation method used to determine the displacement of the cycloid rotor Flowmeter is discussed. A prototype was fabricated, and experiments were performed to confirm measurements over a flow range of 1–100 L/min with relative errors of less than ±0.5%. The pressure loss through the Flowmeter was about 3 bar at a flow rate of 100 L/min.
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A Rotor Speed Sensor of Cycloid Rotor Flowmeter
Advanced Materials Research, 2014Co-Authors: Fan Ding, Chuan DingAbstract:Positive displacement Flowmeters (PDFs) are highly accurate Flowmeters that are relatively insensitive to the upstream velocity distribution and fluid viscosity. Rotor speed sensors are the key components of a PDF. This paper presents the structure of a non-contact rotor speed sensor which can be used in cycloid rotor Flowmeter and other PDFs. The sensor outputs a square wave which contains the speed information of the rotors. The key parameters of the rotor speed sensor are analyzed in this paper and a prototype was fabricated to confirm the rotor speed sensor work well.
Renshi Sawada - One of the best experts on this subject based on the ideXlab platform.
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detection of site specific blood flow variation in humans during running by a wearable laser doppler Flowmeter
Sensors, 2015Co-Authors: Wataru Iwasaki, Hirofumi Nogami, Satoshi Takeuchi, Eiji Higurashi, Masutaka Furue, Renshi SawadaAbstract:Wearable wireless physiological sensors are helpful for monitoring and maintaining human health. Blood flow contains abundant physiological information but it is hard to measure blood flow during exercise using conventional blood Flowmeters because of their size, weight, and use of optic fibers. To resolve these disadvantages, we previously developed a micro integrated laser Doppler blood Flowmeter using microelectromechanical systems technology. This micro blood Flowmeter is wearable and capable of stable measurement signals even during movement. Therefore, we attempted to measure skin blood flow at the forehead, fingertip, and earlobe of seven young men while running as a pilot experiment to extend the utility of the micro blood Flowmeter. We measured blood flow in each subject at velocities of 6, 8, and 10 km/h. We succeeded in obtaining stable measurements of blood flow, with few motion artifacts, using the micro blood Flowmeter, and the pulse wave signal and motion artifacts were clearly separated by conducting frequency analysis. Furthermore, the results showed that the extent of the changes in blood flow depended on the intensity of exercise as well as previous work with an ergometer. Thus, we demonstrated the capability of this wearable blood flow sensor for measurement during exercise.
Shunpei Yamazaki - One of the best experts on this subject based on the ideXlab platform.
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a concentration measurement system for binary gas mixtures using two Flowmeters
Measurement Science and Technology, 2007Co-Authors: Shunpei Yamazaki, Tatsuya Funaki, Kenji Kawashima, Toshiharu KagawaAbstract:A system has been constructed for measurement of the gas concentration in a binary gas mixture and of the total flow rate of the gas mixture, using a venturi Flowmeter and a laminar Flowmeter. The flow rate and air concentration in tested gas mixtures, consisting of air and carbon dioxide or helium, are measured. The results are compared with reference values and the obtained results are found to be similar to those obtained using existing Flowmeters and concentration meters. The response of the system to the flow rate and the mixing ratio change is tested. The flow rate change response is approximately equivalent to existing Flowmeters, and the concentration change response is better than for existing meters.
M. P. Escudier - One of the best experts on this subject based on the ideXlab platform.
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Flowmetering of non-Newtonian liquids
Flow Measurement and Instrumentation, 2004Co-Authors: I. Fyrippi, Ieuan Owen, M. P. EscudierAbstract:Abstract This paper describes the results of an investigation into the performance of Coriolis, electromagnetic, and clamp-on single-beam ultrasonic Flowmeters operating with non-Newtonian liquids. The Flowmeters have been tested on Newtonian liquids (water and a glycerine/water solution) and non-Newtonian liquids (various polymer solutions and a synthetic clay) with flow rates that span the laminar and turbulent regions. It has been shown that the Coriolis Flowmeter operates within the manufacturer’s specification with non-Newtonian liquids. The electromagnetic Flowmeter showed a slight deviation during transition, typically 1%. The ultrasonic Flowmeter showed very significant deviations during transition, typically 15%. It has been clearly demonstrated that Flowmeters which are sensitive to flow velocity profile are particularly unsuitable for use with non-Newtonian liquids. Not only do non-Newtonian liquids have different flow velocity profiles to Newtonian liquids, they also have different criteria for laminar/turbulent transition.
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Flowmetering of shear-thinning non-Newtonian liquids
2003Co-Authors: Ieuan Owen, I. Fyrippi, M. P. EscudierAbstract:This paper describes the results of an investigation into the performance of Coriolis, Electromagnetic, and clamp-on single-beam Ultrasonic Flowmeters operating with non-Newtonian liquids. The Flowmeters have been tested on Newtonian liquids (water and a glycerine/water solution) and non-Newtonian liquids (various polymer solutions and a synthetic clay) with flow rates that span the laminar and turbulent regions. It has been shown that the Coriolis Flowmeter operates within the manufacturer's specification with non-Newtonian liquids. The Electromagnetic Flowmeter showed a slight deviation during transition, typically 1. The Ultrasonic Flowmeter showed very significant deviations during transition, typically 15. It has been clearly demonstrated that Flowmeters which are sensitive to flow velocity profile are particularly unsuitable for use with non-Newtonian liquids. Not only do non-Newtonian liquids have different flow velocity profiles to Newtonian liquids, they also have different criteria for laminar/turbulent transition.
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Flowmetering of Shear-Thinning Non-Newtonian Liquids (Keynote)
Volume 2: Symposia Parts A B and C, 2003Co-Authors: Ieuan Owen, I. Fyrippi, M. P. EscudierAbstract:This paper describes the results of an investigation into the performance of Coriolis, Electromagnetic, and clamp-on single-beam Ultrasonic Flowmeters operating with non-Newtonian liquids. The Flowmeters have been tested on Newtonian liquids (water and a glycerine/water solution) and non-Newtonian liquids (various polymer solutions and a synthetic clay) with flow rates that span the laminar and turbulent regions. It has been shown that the Coriolis Flowmeter operates within the manufacturer’s specification with non-Newtonian liquids. The Electromagnetic Flowmeter showed a slight deviation during transition, typically 1%. The Ultrasonic Flowmeter showed very significant deviations during transition, typically 15%. It has been clearly demonstrated that Flowmeters which are sensitive to flow velocity profile are particularly unsuitable for use with non-Newtonian liquids. Not only do non-Newtonian liquids have different flow velocity profiles to Newtonian liquids, they also have different criteria for laminar/turbulent transition.Copyright © 2003 by ASME
