Mass velocity measurement in steam‐water flow by pitot tubes

New experimental data indicate that mass flux in cocurrent gas-liquid flows may be determined by the use of Pitot tubes in conjunction with a local mixture density measurement technique. The data were taken over a wide range of flow regimes in a horizontal pipe and included separated patterns such as stratified and annular flows. Local mixture densities were obtained by a computer-assisted algebraic reconstruction technique that used chordal average densities measured by traversing gamma beam attenuation.The results extend the applicability of this mass flux measurement technique well beyond the relatively homogeneous, high-pressure, steam-water flow situations originally studied by Banejee and Nguyen (1977). K-F F-L HAUAlChE J o u r n a l (Vol. 27. No. 2) March, 1981 P o p 177 proved successful and may be of use in applications where the average phase distribution is needed. The main conclusion that can be drawn from this and earlier work is that a model for Pitot tube response analogous to that for single-phase flow, gives good predictions of cross-section averaged mass flux.Ideally, a sufficient number of Pitot tube and local mixture density measurements must be made to get good coverage over the flow cross-section. However, our experiments indicate that relatively few Pitot tube measurements may be used together with the appropriate chordal average mixture densities to predict average mass flux quite well. This is important in applications, because equipment for measuring these quantities are easy to fabricate and install.

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“…On the other hand, their response in two-phase flow is not well understood. Work by Banejee and Nguyen (1977), Banejee, et al (1978) and…”

Section: S Banerjee Scopementioning

confidence: 96%

Measurement of mass flux in two‐phase flow using combinations of pitot tubes and gamma densitometers

Hau

Banerjee

1981

AIChE Journal

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“…Examples include application as an averaging flow meter [3], in the flows of heavy liquid metals [4], in gas-liquid multiphase flow measurements [5][6][7][8], and extensively to measure velocity profiles in solid-liquid (slurry) pipeline flows (see Mishra et al [9] for a good review). Most of these applications, to date, have been for higher flows and at lower viscosities so that Bernoulli's Equation applies and C p = 1 and, perhaps equally importantly, is constant i.e.…”

Section: Introductionmentioning

confidence: 99%

The effect of low Reynolds number flows on pitot tube measurements

Spelay

Adane

Sanders

et al. 2015

Flow Measurement and Instrumentation

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“…The measurement method which employs combined flowmeters. For example, the throttling element -volumetric flowmeter, double slotted plate, throttling element -gear flowmeter, target flowmeter -turbine flowmeter, Venturi tube -turbine flowmeter, and orifice -Venturi tube [13][14][15]. D. Wang et al proposed an efficient approach using the combination of a multihole probe and an orifice plate [15], which can obtain high accuracy measurement result on both the flowrate and the dryness of the two-phase flow.…”

Section: Introductionmentioning

confidence: 99%

“…A combination of the conventional flowmeter and phase retention meter. Some two-phase flow measurement devices measure the flow rate of two-phase flow by first determining the velocity of each phase and the phase holdup and then calculating the flowrate of each phase [14,16]. The meter used to measure the speed includes the turbine flowmeter, electromagnetic flowmeter, and differential pressure flowmeter.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Liquid Flow Rate among the Annular Flow in Vertical Tee Junction Using Digital Subtraction Method

Huang

Sun

et al. 2021

Sens Imaging

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Since the liquid flow rate of the annular flow is closely related to the heat exchange efficiency, it has great significance to measure the liquid flow rate of the annular flow in vertical tee junction. In order to acquire the liquid flow rate of the annular flow in vertical tee junction, a measurement method has been designed, which implements the digital subtraction method to measure the thickness of the liquid film under the visible light and to apply the image feature matching algorithm to obtain the liquid velocity field. Moreover, the accuracy of the liquid film velocity field as well as the spatial and temporal stability of the mass flow rate is tested by proposed algorithms in this study. Experimental results show that the measurement error of our method is approximately 5% in the lower section of the main pipe and the branch pipe, and lower than 15% in the upper section of the main pipe. Therefore, this method has a high accuracy in comparison with other measurement approaches. Our method can be applied to measure and analyse the shape and property of the annular flow in the vertical tee junction.

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Mass velocity measurement in steam‐water flow by pitot tubes

Abstract: Micromixing Theory via the Two-Environment Model," ibid., 25, 1785 ( 1970).O'Neill, S. P., "Steady-State stability of Substrate Inhibited Enzyme Catalysis in Open Reaction Systems," Biotechnol. Bioeng., 13,493 (1971).

Cited by 7 publications

References 4 publications

Measurement of mass flux in two‐phase flow using combinations of pitot tubes and gamma densitometers

Measurement of mass flux in two‐phase flow using combinations of pitot tubes and gamma densitometers

The effect of low Reynolds number flows on pitot tube measurements

Measurement of Liquid Flow Rate among the Annular Flow in Vertical Tee Junction Using Digital Subtraction Method

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