Measurement of the fluid flow rate with use of an elbow with oval cross section

Malinowski, Łukasz; Rup, Kazimierz

doi:10.1016/j.flowmeasinst.2008.05.005

Cited by 11 publications

(7 citation statements)

References 1 publication

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“…This sensor is claimed to have very good immunity to external vibration and is recommended for industrial applications where an extremely small volume of liquid is required to be mixed. Malinowski and Rup [12] have utilised the pressure across an elbow of a pipe line as a flow measuring parameter. They have shown that the measurement uncertainties due to pipe vibration may be minimised by using large-diameter pipe at the large flow and small curvature of the elbow at low flow.The effect of centrifugal force produced by the flowing fluid through the lower semicircular section of a vertically mounted U-tube is utilised by Bera [13] to develop a low-cost non-contact flow transducer.…”

Section: Introductionmentioning

confidence: 99%

Investigation on a flow transducer using modified force sensing technique

Bera

Sadhu

2020

IET Science, Measurement &Amp; Technology

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The principle of centrifugal force produced by flowing fluid through the semicircular section of a pipe line is not sufficient to explain the characteristic of the centrifugal force type flow transducer developed from this principle. In this study, a modified form of this flow transducer is developed using a modified force sensing technique. This modified force principle explains the characteristic of the flow transducer to a very good extent. The modified force produced in the modified transducer system is composed of four components namely, centrifugal force, momentum force, damping force and restoring force. These forces produce the identical downward and upward movements of the lever ends of a common balance which is initially made horizontal at zero flow by using similar sensing U-tube and dummy U-tube. These movements are sensed by two identical inductive sensors. The static characteristic equation of the prototype unit of the transducer using the modified force sensing technique is derived mathematically in the study. The equation coefficients are calculated from the design parameters and are found to be matched with the same obtained from the average characteristic of repeated experiments performed under the same laboratory environment. Thus the proposed modified model appears to be established.

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Section: Introductionmentioning

confidence: 99%

Investigation on a flow transducer using modified force sensing technique

Bera

Sadhu

2020

IET Science, Measurement &Amp; Technology

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“…When a classical measuring orifice is used to measure the flow rate, it is necessary to install long pipeline sections with a circular cross section (Bean, 1971; PN-EN ISO 5167-1, 2004; Spitzer, 2001). It appears that circular-shaped elbow flow meters, which have been installed on the pipeline, enable to obtain a signal that corresponds to the entire volumetric rate of the fluid flow (Malinowski and Rup, 2008; Spitzer, 2001). The principle that pertains to operation of elbow flow meter is based on the use of the ratio of volumetric rate of flow to the difference between pressures measured at extreme points of elbow arc secant.…”

Section: Introductionmentioning

confidence: 99%

“…In practice, engineers sometimes use a solution where the pressure is measured through pulse apertures that are situated along the plane, which is not aligned with the secant. In such a case, the measured pressure difference attains lower values (Malinowski and Rup, 2008; Spitzer, 2001). The standard measurement is carried out in the following manner: a pressure difference is measured, and subsequently, a relevant volumetric flow rate value is assigned based on the previously worked out characteristics of the instrument.…”

Section: Introductionmentioning

confidence: 99%

Indirect measurement of the flow rate based upon a solution of an inverse coefficient problem

Rup

Malinowski

Sarna

2018

HFF

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Purpose The purpose of this paper is to extend the possibilities of using the earlier developed indirect method of fluid flow rate measurement in circular pipes to the square-section channels with elbows installed. Design/methodology/approach The idea of the method is based on selecting such a value of the Reynolds number assumed as a coefficient in fluid flow equations, which fulfills with set accuracy the condition of equality between the measured and computed pressure difference at the end points of the secant of the elbow arch. The numerical calculus takes into consideration the exact geometry of the flow space and the measured temperature of the fluid, on the basis of which its thermo–physical properties are determined. To implement the proposed method in practice, a special test stand was built. The numerical computations were carried out using the software package FLUENT. Findings The results of calculations were compared with corresponding results of measurements achieved on the stand, as well as those found in the literature. The comparative analysis of the obtained numerical and experimental results shows a high grade of consistence. Practical implications The discussed elbow flow meter, implementing the extended indirect measuring method, can be applied to determine the flow rate of gases, as well as liquids and suspensions. Originality/value The indirect method used to measure the volumetric flow rate of the fluid is characterized by high accuracy and repeatability. The high accuracy is possible because of a very realistic mathematical model of the complex flow in the curved duct. The indirect method eliminates the necessity of frequent calibration of the flow meter. The discussed extended indirect measuring method can be applied to determine the flow rate of gases as well as liquids and suspensions. The fluid flow rate measurement based on the method considered in this paper can be particularly useful in newly designed as well as already operated ducts.

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“…Then the hot helium releases its thermal power to the water in the secondary loop and is cooled down to around 250 ∘ C. The cooled helium from 14 riser pipes collects into the header box and is pumped back to the reactor by the blower. Each of the riser pipes is connected to the header box by a 90 ∘ elbow, as shown in Figure 1(b), which is used as the sensor to measure the helium flow rate by monitoring the pressure difference between its intrados and extrados [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

A Study on the Instantaneous Turbulent Flow Field in a 90-Degree Elbow Pipe with Circular Section

Wang

Ren

Sun

et al. 2016

Science and Technology of Nuclear Installations

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Based on the special application of 90-degree elbow pipe in the HTR-PM, the large eddy simulation was selected to calculate the instantaneous flow field in the 90-degree elbow pipe combining with the experimental results. The characteristics of the instantaneous turbulent flow field under the influence of flow separation and secondary flow were studied by analyzing the instantaneous pressure information at specific monitoring points and the instantaneous velocity field on the cross section of the elbow. The pattern and the intensity of the Dean vortex and the small scale eddies change over time and induce the asymmetry of the flow field. The turbulent disturbance upstream and the flow separation near the intrados couple with the vortexes of various scales. Energy is transferred from large scale eddies to small scale eddies and dissipated by the viscous stress in the end.

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Measurement of the fluid flow rate with use of an elbow with oval cross section

Cited by 11 publications

References 1 publication

Investigation on a flow transducer using modified force sensing technique

Investigation on a flow transducer using modified force sensing technique

Indirect measurement of the flow rate based upon a solution of an inverse coefficient problem

A Study on the Instantaneous Turbulent Flow Field in a 90-Degree Elbow Pipe with Circular Section

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