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Showing papers on "Thermal mass flow meter published in 2016"


Journal ArticleDOI
TL;DR: In this paper, a two-dimensional numerical model of the falling film evaporation on horizontal tubes is presented, where the temporal change characteristics of the film flow process were studied and different types of flow (stable film and drops mode) were investigated, by varying the ratio between the water-to-air mass flow ratio.

54 citations


Journal ArticleDOI
TL;DR: In this article, a micromachined thermal flow sensors for measuring liquid flow down to 0.05 μl/min is presented, where the sensing element is a parylene-C thin film with two thin film platinum resistors as heating and sensing elements.
Abstract: This paper presents micromachined thermal flow sensors for measuring liquid flow down to 0.05 μl/min. The sensing element is a parylene-C thin film with two thin film platinum resistors as heating and sensing elements. The sensors are integrated with AWG 24 Teflon tubing and additional two external constant resistors to form a Wheatstone bridge. In this study, we investigated the efficacy of the orifice type sensor in two configurations, vertical and horizontal. In vertical configuration, the sensor was arranged perpendicular to the flow direction. The orifice flow allows maximum heat transfer from the sensor to the flow but leads to higher flow resistance. After redesigning the geometries of the sensor, the dumbbell type thermal flow sensor was further developed. The sensor is suspended in the middle of the channel to improve thermal insulation and achieve better sensitivity. The sensors have demonstrated a flow rate resolution below 0.05 μl/min. The experimental results show that the sensor has a sensitivity of 7.7 mV/(μl/min) at 0.13 mW power consumption and 0.05 μl/min volumetric flow rates. Comparison with related literature has been made to judge how good the flow sensors developed in this study are.

44 citations


Journal ArticleDOI
TL;DR: In this paper, a generalized nonintrusive polynomial chaos method was used in conjunction with a commercial CFD code to predict the systematic bias in the measurement of the flow rate and the associated contribution to its measurement uncertainty.

34 citations


Journal ArticleDOI
TL;DR: In this article, a new methodology for measurement of the instantaneous average exhaust mass flow rate in reciprocating internal combustion engines is presented, which is used to determinate real driving emissions on light duty vehicles, as part of a Portable Emission Measurement System (PEMS).

18 citations


Journal ArticleDOI
TL;DR: In this article, the effect of natural gas compositions variation on the performance of capillary tube thermal mass flow meters in residential use is studied and the results show that using an average specific heat capacity value for different mixtures causes a deviation below a maximum of only 1.8% and overall average error of 0.62% in measurement accuracy.

17 citations


Journal ArticleDOI
TL;DR: In this article, a vibration detection device for gas-solid flow has been developed and its evaluation test is conducted indoor, which illustrates the application of special wideband vibration sensor and sand mass flow computing method to monitor gas-sand flow in pipeline.

17 citations


Journal ArticleDOI
TL;DR: In this article, the calibration procedure and uncertainty evaluation of CTTMFs (Capillary Type Thermal Mass Flow Meter) for natural gas in domestic/residential (G4) applications are discussed.

14 citations


Journal ArticleDOI
TL;DR: In this paper, an apparatus was designed, built and tested to calibrate an industrial scale Coriolis meter using CO 2 in either high pressure liquid or supercritical phases, and the standard uncertainty of the meter was evaluated within the temperature range 290 −303 K and at pressures between 6.5 and 8.5 MPa, these being representative of CCS transport operating conditions.

14 citations


Patent
19 Feb 2016
TL;DR: In this article, the authors present a method for measuring fluid flow rate of fluids of differing properties without necessity of a separate flow calibration for each fluid, without need for calibration of the flow sensor for that particular fluid.
Abstract: The present invention provides a MEMS thermal flow sensor or meter for measuring the flow rate of a fluid without need for calibration of the flow sensor for that particular fluid. A response curve is determined by plotting the sensor output voltage against the volume flow rate divided by fluid thermal diffusivity for a calibration fluid of known thermal diffusivity, and storing response curve data in memory. A conversion factor is employed to provide a measure of correct flow rate of an unknown fluid. This conversion factor is derived from the ratio of the thermal time constant of the calibration fluid to the thermal time constant of the measured fluid, the time constants being measured at zero flow. These time constants are stored in memory. This conversion factor in conjunction with the response curve data is utilized by the processor to produce the correct flow rate. The invention also encompasses a method for measuring fluid flow rate of fluids of differing properties without necessity of a separate flow calibration for each fluid.

13 citations


Proceedings ArticleDOI
Lijuan Wang1, Jinyu Liu1, Yong Yan1, Xue Wang1, Tao Wang 
23 May 2016
TL;DR: A neural network based approach is applied to Coriolis flowmeters to measure both the liquid flow rate and the gas volume fraction of a two-phase flow to suggest that the relative errors of the corrected mass flow rate for the vertical and horizontal installations are no greater than ±1.5% and ±2.5%, respectively.
Abstract: Coriolis flowmeters are commonly used to measure single phase flow. In recent years attempts are being made to apply Coriolis flowmeters to measure two-phase flows. This paper presents a neural network based approach that has been applied to Coriolis flowmeters to measure both the liquid flow rate and the gas volume fraction of a two-phase flow. Experimental tests were conducted on a purpose-built two-phase flow test rig on both horizontal and vertical pipelines. The mass flow rate ranges from 700 kg/h to 14500 kg/h whilst the gas volume fraction is between 0 and 30%. A set of variables, including observed density, apparent mass flow, differential pressure across the Coriolis flowmeter and signals to maintain flow tube oscillation, are considered as inputs to a neural network. Two neural networks are established through training with experimental data obtained from the flow rig on horizontal and vertical pipelines, respectively. The performance of both neural networks is assessed in comparison with the reference readings. Experimental results suggest that the relative errors of the corrected mass flow rate of liquid for the vertical and horizontal installations are no greater than ±1.5% and ±2.5%, respectively. The gas volume fraction is predicted with relative errors of less than ±10% and ±20%, respectively, for vertical and horizontal installations in most cases.

11 citations


Journal ArticleDOI
TL;DR: In this paper, a bypass type flow meter with a permanent magnet flow meter as sensor in the bypass line is selected for the flow measurement in the 800NB main secondary pipe line of 500 MWe Prototype Fast Breeder Reactor (PFBR), which is at the advanced stage of construction at Kalpakkam.

Journal ArticleDOI
TL;DR: In this paper, the sensitivity of thermal mass flow-meters with natural gas quality changes and different flow disturbances is investigated, and the accuracy of full bore insertion in line TMFs is affected by the interaction between sensor and piping both for double out of plane bend and single 90° bend disturbances.

Patent
29 Apr 2016
TL;DR: In this paper, a multiphase flow meters and related methods are described, including an inlet manifold, an outlet manifold, first and second flow paths coupled between the inlet and outlet manifolds, and an analyzer to determine a flow rate of fluid flowing through the first and two flow paths based on a parameter of the fluid flowing along the first flow path.
Abstract: Multiphase flow meters and related methods are disclosed herein. An example apparatus includes an inlet manifold; an outlet manifold, first and second flow paths coupled between the inlet and outlet manifolds; and an analyzer to determine a flow rate of fluid flowing through the first and second flow paths based on a parameter of the fluid flowing through the first flow path.

Patent
04 Jul 2016
TL;DR: In this article, a consumption meter is used to measure the noise level of a flow tube, which can be used to assist in locating fluid leakages in a fluid supply pipe system, and the consumption meter may communicate data representative of the noise levels via a communication module along with data consumed amount of water, heat etc.
Abstract: A consumption meter, e.g. a water or heat meter, for measuring a flow rate of a fluid supplied in a flow tube. First and second ultrasonic transducers are arranged at the flow tube for transmitting and receiving ultrasonic signals transmitted through the fluid and operated by a flow measurement sub-circuit for generating a signal indicative of the flow rate of the fluid. A noise measurement sub-circuit operates a sensor arranged at the flow tube for detection of acoustic signals of the flow tube, and being arranged to generate a signal indicative of a noise level of the flow tube accordingly. This sensor may comprise a separate transducer, or the sensor may be constituted by one or both of the first and second ultrasonic transducers. The consumption meter may communicate data representative of the noise level via a communication module along with data consumed amount of water, heat etc. Such consumer noise level measurement at the consumer site allows collection of noise level data to assist in locating fluid leakages in a fluid supply pipe system.

Proceedings ArticleDOI
24 Jan 2016
TL;DR: In this article, the first single-chip mass flow controller with an integrated Coriolis mass flow sensor and a proportional control valve is presented, which can control mass flow up to 70 mg h−1 nitrogen gas at an applied pressure of 500 mbar.
Abstract: We have designed, fabricated and tested the, to our knowledge, first ever single-chip mass flow controller with an integrated Coriolis mass flow sensor and a proportional control valve. A minimum internal volume is obtained, because the complete fluid path is integrated in a single chip. We demonstrated that the system can control mass flow up to 70 mg h−1 nitrogen gas at an applied pressure of 500 mbar.

Patent
24 Feb 2016
TL;DR: An electronic utility gas meter using MEMS thermal mass flow sensor to measure gas custody transfer data in city gas metering application is disclosed in this article, which is designed to have its mechanical connectors identical to those of the current diaphragm gas meters while the insertion metrology unit guided channel is placed coaxially in the main flow channel inside the meter body with gas flow conditioning apparatus.
Abstract: An electronic utility gas meter using MEMS thermal mass flow sensor to measure gas custody transfer data in city gas metering application is disclosed in the present invention. The meter is designed to have its mechanical connectors identical to those of the current diaphragm gas meters while the insertion metrology unit guided channel is placed coaxially in the main flow channel inside the meter body with gas flow conditioning apparatus. The mechanical installation of the electronic utility gas meter then can be fully compatible with the current mechanical utility gas meters, which allows a seamless replacement. The electronic utility gas meter provides gas metrology that significantly improves the accuracy of the city gas metering, and provides additional benefits for data safety, enhanced gas chemical safety, billing alternatives and full data management either locally or remotely.

Patent
16 Nov 2016
TL;DR: In this article, a capillary heating type thermal mass flow meter provided with a sensor for detecting the temperature and pressure of a fluid and a correction means for correcting a mass flow rate on the basis of the temperature, pressure, and the rates of change for the same.
Abstract: A capillary heating type thermal mass flow meter provided with a sensor for detecting the temperature and pressure of a fluid and a correction means for correcting a mass flow rate on the basis of the temperature and pressure, wherein the rates of change of the mass flow rate of the fluid in relation to the temperature and pressure are determined beforehand and the mass flow rate is corrected on the basis of the temperature, pressure, and the rates of change for the same. As a result, even if the temperature and/or pressure of the fluid to be measured for the mass flow rate changes, the mass flow rate can be measured accurately and simply.

Proceedings ArticleDOI
01 Oct 2016
TL;DR: In this paper, an experimental method for determining the constant K, for the constant flow cross-section of the flow meters and the pressure drop variable is presented, based on the Bernoulli equation.
Abstract: Beeing a part of the no moving parts instruments, differential flow meter are mainly used in the industrial environment, not being found in house hold use. The basic functional principle consists in the appearance of a differential pressure between two points of the flow, if between this comes a flow resistivity object (obstacle, strangulation, elbow). The relationship between pressure and velocity is described by the Bernoulli equation. Measuring the pressure difference the velocity can be calculated and the flow implicitly. There are a several kinds of differential pressure flow meters: Venturi, Nozzle, Pitot, and measuring diaphragms. This paper refers to an experimental method for determining the constant K, for the constant flow cross-section of the flow meters and the pressure drop variable.

Journal ArticleDOI
Jiang Wei1, Tao Zhang1, Huaxiang Wang1, Ying Xu1, Liu Yi1, Liu Xinfeng1 
TL;DR: In this article, the influence of gas temperature on the sheathed probe measurements is analyzed based on experiments and heat transfer theory using a three dimensional probe and gas heat transfer mathematical model based on the heat conduction equation.

Patent
30 Dec 2016
TL;DR: In this article, a non-invasive thermal dispersion flow meter with chronometric monitor for fluid leak detection includes a heater, an ambient temperature sensor and a flow rate sensor which are configured to sense the temperature of a fluid in a conduit, and then monitor the flow of that fluid through the conduit.
Abstract: A non-invasive thermal dispersion flow meter with chronometric monitor for fluid leak detection includes a heater, an ambient temperature sensor and a flow rate sensor which are configured to sense the temperature of a fluid in a conduit, and then monitor the flow of that fluid through the conduit. The fluid flow sensor is incorporated into a Wheatstone bridge circuit, which is used to provide increased sensitivity to the outputs of the sensors, Based upon the ambient temperature sensor readings, the flow rate sensor and heater may be adjusted to optimize the operation of the system to detect leaks. An alternative embodiment utilizes a single sensor and separate heater which work together to determine heat propagation times which in turn is used to calculate flow rate. Based on the sensor readings, the flow may be adjusted to prevent damage and leaks by relieving the system of excess pressure.

Journal ArticleDOI
TL;DR: An entirely pressure-based vortex shedding meter has been designed for use in practical time-dependent flows as discussed by the authors, which is capable of measuring mass-flow rate in variable density gases in spite of the fact that fluid temperature is not directly measured.
Abstract: An entirely pressure-based vortex-shedding meter has been designed for use in practical time-dependent flows. The meter is capable of measuring mass-flow rate in variable density gases in spite of the fact that fluid temperature is not directly measured. Unlike other vortex meters, a pressure based meter is incredibly robust and may be used in industrial type flows; an environment wholly unsuitable for hot-wires for example. The meter has been tested in a number of static and dynamic flow cases, across a range of mass-flow rates and pressures. The accuracy of the meter is typically better than about 3% in a static flow and resolves the fluctuating mass-flow with an accuracy that is better than or equivalent to a hot-wire method.

Patent
30 Mar 2016
TL;DR: In this paper, the welding terminals that function as input/output terminals in a heater element in a thermal mass flow meter were used to improve the reliability of electrical connections made by spot welding.
Abstract: The purpose of the present invention is, with regard to welding terminals that function as input/output terminals in a heater element in a thermal mass flow meter, to improve the reliability of electrical connections made by spot welding between the welding terminals and terminal parts of a heat-generating resistance line constituting a heater element and to effectively prevent the adhesion of the welding terminals to electrodes of a spot welder. The material constituting the welding terminals is a metal or alloy with a melting point having a temperature differential relative to the melting point of the heat-generating resistance line of no greater than 100oC, and one or more covering layers are provided on the surface of the welding terminals. It is preferable for the covering layers to comprise a base covering layer formed from nickel and a surface covering layer formed from gold.

Patent
01 Feb 2016
TL;DR: In this article, the authors proposed a method to measure air volume in a duct using a pitot tube, where voltage and a positive pressure are applied to the double pipe type pitot tubes.
Abstract: The present invention relates to a duct flowmeter and an air volume measurement method thereof and, more specifically, relates to a device and a method to measure air volume in a duct using a pitot tube. According to the present invention, the flowmeter comprises: a double pipe type pitot tube (101) to which voltage and a positive pressure are applied; and a measurement unit (160) measuring air volume using a negative pressure generated in the double pipe type pitot tube (101). The measurement unit (160) comprises: a differential pressure flow path (130) wherein a fluid flows due to a different pressure between the voltage and the positive pressure applied to the double pipe type pitot tube (101); a hot wire flow speed sensor (140) measuring a differential pressure flow rate of the fluid in the differential pressure flow path (130); and a controller (300) measuring the differential pressure using the differential pressure flow rate measured in the hot wire flow speed sensor (140), and measuring the flow rate using the differential pressure.

Patent
24 Mar 2016
TL;DR: In this paper, a Coriolis flow meter was proposed for measuring fluid parameters, comprising a flow tube and an actuator forcing the flow tube into vibration and/or rotation.
Abstract: The invention relates to a device for measuring fluid parameters, comprising a Coriolis flow meter. The meter comprises a flow tube and an actuator forcing the flow tube into vibration and/or rotation. Further, the meter comprises a displacement sensor for sensing a displacement of the flow tube. The displacement sensor is arranged for measuring an optical fiber length change.



Patent
25 May 2016

Journal ArticleDOI
TL;DR: In this paper, a VME-based Data Acquisition System (DAS) has been developed and used to acquire the flow measurement data from different flowmeters in SST-1 superconducting magnet system.

Proceedings ArticleDOI
01 Oct 2016
TL;DR: In this paper, a microneedle thermal flow sensor for measuring low speed liquid flows is presented, which can be flexibly applied to a variety of fluids, including laminar flow, and joule heating.
Abstract: We present a microneedle thermal flow sensor for measuring low speed liquid flows. Even though many types of liquid flow sensor have been developed, they are limited to flow measurements only in specific closed systems. However, our needle-shaped flow sensor can be flexibly applied to variety of fluids. To predict sensor operation, we conducted thermal transport simulation based on multi-physics modeling comprising heat transfer in fluids, laminar flow, and joule heating. Our measurement system consists of needle shape sensor, fabricated by deep reactive ion etching (DRIE) process, and microprocessor-based control system combined with voltage regulator and amplifier.

Patent
02 Dec 2016
TL;DR: In this article, a thermal mass flow meter with a sintered filter was proposed to improve the accuracy of a sensor tube by making stratification earlier by mounting the sintering filter in an inlet of the sensor tube of the thermal flow meter and preventing the tube from being clogged by filtering impurities.
Abstract: The present invention relates to a thermal mass flow meter for measuring a flow rate and, more specifically, to a thermal mass flow meter with a sintered filter capable of improving the accuracy of a sensor tube by making stratification earlier by mounting the sintered filter in an inlet of the sensor tube of the thermal mass flow meter and preventing the sensor tube from being clogged by filtering impurities flowing into the sensor tube. The present invention, in the thermal mass flow meter measuring a mass of a fluid flowing through a bypass (3) with the sensor tube (4) including a heater (5) and a resistance thermometer (6), provides the thermal mass flow meter with the sintered filter characterized by stratifying the flow of the fluid flowing inside the sensor tube (4) and removing the impurities contained in the fluid by mounting the sintered filter (19) in the flow inlet of the sensor tube (4).