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Thermal mass flow meter
About: Thermal mass flow meter is a research topic. Over the lifetime, 1759 publications have been published within this topic receiving 21878 citations.
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28 May 2015
TL;DR: In this article, the authors highlight and simulate the variation in accuracy for flow rate measurement for Reynolds number ranging from 8 ×105 to 10 ×105 with ultrasonic flow meter with different sloped straight length considering upstream and downstream length as per the standards.
Abstract: Precision in flow measurement has economic consequences and also necessitates fulfillment of stipulated requirement of straight length upstream and downstream of flow meter However, many times, the site constraints do not permit to fulfill this requirement IEC 41(1991) recommends use of ultrasonic flow meter as a complimentary to other flow measuring techniques for hydro turbines The motivation of the study is drawn from the typical water conductor system of hydro plants where the penstocks are generally sloped conduit in nature The experimental investigation presented in this paper is to highlight and simulate the variation in accuracy for flow rate measurement for Reynolds number ranging from 08 ×105 to 10 ×105 with clamp-on ultrasonic flow meter with different sloped straight length considering upstream and downstream length as per the standards The error in flow measurement by ultrasonic flow meter in straight length varied from −10% to +10% to the reference flow as per the acceptable level Whereas, the increase of slope straight angle the percentage of shift in error is increases The error in flow measurement of 6° degree pipe line was in the range of 40% Similarly, the conduit of 12° degrees pipe line was up to 8% The velocity distortion of the sloped pipes is also validated using commercial CFD Fluent solver These findings are useful in selecting suitable location for the installation Presently ultrasonic flow meters do not address the use at site conditions like sloped pipes Therefore the existing ultrasonic flow metering techniques need attention for up gradation
4 citations
TL;DR: In this study, a miniaturized mass-flow meter for discharged patients with an implantable axial blood pump was developed on the basis of computational analysis, and was evaluated in in-vitro tests, confirming that the miniaturizer could accurately measure themass-flow rate continuously and noninvasively.
Abstract: In order to monitor the condition of patients with implantable left ventricular assist systems (LVAS), it is important to measure pump flow rate continuously and noninvasively. However, it is difficult to measure the pump flow rate, especially in an implantable axial flow blood pump, because the power consumption has neither linearity nor uniqueness with regard to the pump flow rate. In this study, a miniaturized mass-flow meter for discharged patients with an implantable axial blood pump was developed on the basis of computational analysis, and was evaluated in in-vitro tests. The mass-flow meter makes use of centrifugal force produced by the mass-flow rate around a curved cannula. An optimized design was investigated by use of computational fluid dynamics (CFD) analysis. On the basis of the computational analysis, a miniaturized mass-flow meter made of titanium alloy was developed. A strain gauge was adopted as a sensor element. The first strain gauge, attached to the curved area, measured both static pressure and centrifugal force. The second strain gauge, attached to the straight area, measured static pressure. By subtracting the output of the second strain gauge from the output of the first strain gauge, the mass-flow rate was determined. In in-vitro tests using a model circulation loop, the mass-flow meter was compared with a conventional flow meter. Measurement error was less than ±0.5 L/min and average time delay was 0.14 s. We confirmed that the miniaturized mass-flow meter could accurately measure the mass-flow rate continuously and noninvasively.
4 citations
TL;DR: In this paper, the characteristics of venturimeter and orifice meter with sediment-laced flow are described and various works that have been carried out till now in the analysis of characteristics of VMs with sediment laden flow with slurry-water mixture are described.
Abstract: Measurement of flow is an important aspect in the field of hydraulic engineering, both in case of open channel as well as pipe or conduits. In case of pipe conduits various flow meters are used for flow estimation; out of which venturimeter and orifice meter are most commonly used and conventional means. Pipes or conduit carrying sediment laden flow or slurry-water mixture is very common in most of the industries, sewage carrying system etc. Suitability of flow meters i.e. venturimeter and flow meter need to be analyzed for sediment laden flow. Due to the presence of slurry or sediments, coefficient of discharge of flow meter will vary. In the present paper, various works that have been carried out till now in the analysis of characteristics of venturimeter and orifice meter with sediment laden flow are described.
4 citations