Experimental research of single-hole and multi-hole orifice gas flow meters

Đurđević, Marko; Bukurov, Maša; Tašin, Slobodan; Bikić, Siniša

doi:10.1016/j.flowmeasinst.2019.101650

Cited by 21 publications

(14 citation statements)

References 10 publications

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“…The differences between single-hole and multi-hole orifices with the same contraction coefficient are marginal. This can be due to the absence of a central hole in the multi-hole orifices that, according to results reported by Đurđević et al [ 5 ], can significantly decrease the value of pressure loss coefficient.…”

Section: Resultsmentioning

confidence: 60%

“…Nevertheless, they did not examine the exact geometries as presented in this paper. Đurđević et al [ 5 , 7 ] observed lower pressure loss coefficients for multi-hole orifice flowmeters but the orifices were distributed closer to the orifice center or there was an additional central hole, which probably made the pressure drop smaller. Özahi et al [ 12 ] investigated the impact of contraction coefficient on pressure loss coefficient in perforated plates and proposed a simple correlation.…”

Section: Discussionmentioning

confidence: 99%

“…A conventional orifice has a single circular opening made in the center of a disc, which is usually mounted inside a pipeline. Recently, consideration has been given to application of multi-hole orifices (MHOs) for measuring purposes [ 3 , 4 , 5 , 6 , 7 ]. The metering principle is the same as for the standard orifice.…”

Section: Introductionmentioning

confidence: 99%

“…All holes in the multi-hole orifice usually have the same hydraulic diameter and the minimum flow area depends on the β ratio [ 8 ]. The main advantage of a multi-hole orifice is better resistance to flow disturbance [ 5 , 9 ], which should result in a shorter length of the required pipeline sections up- and downstream of the orifice. The recommended upstream section length, after 90° turn, for a single-hole orifice [ 10 ] can exceed 40 duct diameters, while using a multi-hole orifice could allow for accurate mass flow measurement with a shorter duct length.…”

Section: Introductionmentioning

confidence: 99%

“…Đurđević et al [ 5 ] investigated pressure loss coefficient for several types of multi-hole orifice in terms of Reynolds number. The working fluid was humid air with pressure from 2 bar to 16 bar.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Experimental and Numerical Analysis of Multi-Hole Orifice Flow Meter: Investigation of the Relationship between Pressure Drop and Mass Flow Rate

Tomaszewski

Przybyliński

Lackowski

2020

Sensors

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The paper presents the results of the experimental and numerical analysis of a six-hole orifice flow meter. The experiments were performed on humid air in a 100 mm diameter duct. The aim of this research was to investigate the mass flow and pressure drop dependency in an orifice of a predetermined shape and to compare the results obtained with computational formulas recommended in the ISO 5167-2 standard for a single-hole orifice flow meter. The experiments and calculations were performed on several multi-hole orifice geometries with different contraction coefficient in a wide range of Reynolds numbers. The pressure was probed immediately upstream and downstream of the orifice. The flow coefficient determined for the six-hole orifice flow meter investigated was compared with the flow coefficient of conventional single-hole orifice with the same contraction coefficient. The results from computational formulas for single-hole orifice from ISO 5167 are also included in the paper. During some experiments, an obstacle has been introduced in the duct at variable distance upstream from the orifice. The effect of the thus generated velocity field disturbance on the measured pressure drop was then investigated. Numerical simulation of the flow with the presence of the obstacle was also performed and compared with experimental data.

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Section: Resultsmentioning

confidence: 60%

Section: Discussionmentioning

confidence: 99%