Discharge Coefficient and Head Loss under Sluice Gates with Small Opening

2021 ◽  
Vol 147 (12) ◽  
pp. 04021054
Author(s):  
Lei Wang ◽  
Ming-jun Diao
Keyword(s):  
Discharge Coefficient ◽  
Head Loss ◽  
Small Opening

Metering Performance Investigation and Substantiation of the “Universal Venturi Tube” (U.V.T.): Part 1—Hydraulic Shape and Discharge Coefficient

1974 ◽  
Vol 96 (2) ◽  
pp. 124-131 ◽  
Author(s):  
D. Halmi
Keyword(s):  
Standard Deviation ◽  
Discharge Coefficient ◽  
Standard Procedure ◽  
Reynolds Numbers ◽  
Head Loss ◽  
Venturi Tube ◽  
Flow Mechanism ◽  
The Past ◽  
Wide Range ◽  
Tube Type

The UVT provides Classical Venturi tube type metering performance with less than half the laying length, no annular chambers, and about half the permanent head loss. Data presented reveal the flow mechanism inside the tube and substantiate its performance over a wide range of Reynolds numbers, line sizes, beta ratios, tube materials, upstream and downstream piping configurations for incompressible and compressible flow. The experience of the past five years indicates ± 0.5 percent two times standard deviation uncalibrated accuracy for C.I. UVT’s. Due to its depth and method, the substantiation work was unique; consequently, it is recommended as a standard procedure for the performance substantiation of any kind of flow meter presently in use or to be introduced in the future.

Impact of Orifice Length/Diameter Ratio on 90 deg Sharp-Edge Orifice Flow With Manifold Passage Cross Flow

2009 ◽  
Vol 131 (8) ◽  
Author(s):  
W. H. Nurick ◽  
T. Ohanian ◽  
D. G. Talley ◽  
P. A. Strakey
Keyword(s):  
Turbulent Flow ◽  
Discharge Coefficient ◽  
Cross Flow ◽  
Head Loss ◽  
Area Ratio ◽  
Loss Coefficient ◽  
Operating Conditions ◽  
Sharp Edge ◽  
Test Facility ◽  
Contraction Coefficient

The available information describing the various stages of flow conditions that occur as the flow transitions from noncavitation to cavitation (turbulent flow), supercavitation, and finally separation in sharp-edge 90 deg orifices is extensive. However, although sharp-edge orifices in cross flow represent a significant number of injection schemes inherent in many applications, data for this configuration are sparse or nonexistent. This study is intended to increase the database and understanding of the driving variables affecting the flow in all of these conditions. Tests were carried out in a unique test facility capable of achieving large variations in back pressure, flowrate, and operating upstream pressure. The configuration and test ranges of this study includes orifice length/diameter ratios from 2 to 10, upstream pressures from 7.03 kg/cm2 to 105.1 kg/cm2, orifice/manifold area ratio of 0.028 to 0.082, and manifold cross flow velocity of from 410 cm/s to 1830 cm/s. The results for these small area ratio configurations support two different first order models, one for cavitation and the other noncavitation both in turbulent flow. Under cavitation conditions the discharge coefficient is related to the contraction coefficient and the cavitation parameter to the 1/2 power. In the noncavitation flow regime the head loss is related to the loss coefficient and the dynamic pressure at the orifice exit. Both the head loss and contraction coefficient were found to be a strong function of the ratio of manifold/orifice exit velocity. Equations are provided defining the relationships that allow determination of the contraction coefficient, discharge coefficient, and head loss between the contraction coefficient, as well as the loss coefficient and operating conditions. Cavitation parameter values for cavitation inception, cavitation, and supercavitation are also provided. The potential flow theory was shown to predict the contraction coefficient when upstream (manifold to vena-contracta) losses are minimal.

Computer Modeling of Flow Through Engineering Devices: Exercises for the Undergraduate Student

1991 ◽  
Author(s):  
J. J. Bazaar ◽  
J. R. Shanebrook
Keyword(s):  
Experimental Data ◽  
Theoretical Model ◽  
Engineering Students ◽  
Discharge Coefficient ◽  
Head Loss ◽  
Published Data ◽  
Undergraduate Engineering ◽  
Pipe Expansion ◽  
Flow Through ◽  
American Society

Abstract The purpose of this paper is to describe four computer exercises that have been developed for undergraduate engineering students at Union College. Each exercise involves a computer model for predicting steady, viscous flow through an engineering device. All of the analyses were performed using FLUENT, a finite-difference fluid modeling program marketed by Creare, Inc. The following cases are described in this paper: 1. The flow through a square-edged orifice was modeled and results for discharge coefficient are compared with experimental data published by the American Society of Mechanical Engineers (ASME). 2. The flow through a quadrant-edged orifice was modeled and results for discharge coefficient are compared with published data. 3. The flow through a Herschel-type Venturi meter was calculated and results for discharge coefficient are compared with ASME data. 4. The flow through a sudden pipe expansion was modeled and results for head loss are compared with a theoretical model.

Approximation of the discharge coefficient of differential pressure flowmeters using different soft computing strategies

2021 ◽  
Vol 79 ◽  
pp. 101913
Author(s):  
Zhanat Dayev ◽  
Aiat Kairakbaev ◽  
Kaan Yetilmezsoy ◽  
Majid Bahramian ◽  
Parveen Sihag ◽  
...  
Keyword(s):  
Soft Computing ◽  
Discharge Coefficient ◽  
Differential Pressure

scholarly journals Evaluate of head loss, sediment value and copper removal in sand media (rapid sand filter)

2014 ◽  
Vol 3 (2) ◽  
pp. 276-286 ◽  
Author(s):  
Daneshi Navab ◽  
Banejad Hossein ◽  
Pirtag Hamedany Reza ◽  
Daneshi Vahab ◽  
Farokhi Maedeh
Keyword(s):  
Water Resources ◽  
Copper Concentration ◽  
Technology Development ◽  
Wastewater Treatment Plants ◽  
Single Layer ◽  
Head Loss ◽  
Copper Removal ◽  
Time Interval ◽  
Water And Wastewater Treatment ◽  
Sand Filter

Along with the technology development and increasing consumption of water resources, we are experiencing low qualities in the mentioned resources. Copper brings about serious environment al pollution, threatening human health and ecosystem. This metal found variously in water resources and industrial activities. Therefore, it needs to treat the water resources from these excessive amounts. Different methods have used for this reason but the most used method during recent years has been the absorption by economic absorbers such as sand. Rapid sand filters usually used in water and wastewater treatment plants for water clarification. In this research, a single layer gravity rapid sand filter has used to reduce different concentrations of copper. sediment value and head loss arising in filter media is simulated by using combination of Carman-Kozeny, Rose and Gregory models in different discharges of rapid sand filter. Results have shown that with increasing in discharge and decreasing in input copper concentration, arriving time to given head loss, is increasing. In addition, results demonstrated that with increasing in copper concentration in influent, removal efficiency is decreasing somewhat. Results of this research can applied in an appropriate design of rapid sand filter to copper removal, a prediction of rapid sand filter ability to copper removal and an estimation of arising head loss during filter work thus evaluating of time interval backwash. DOI: http://dx.doi.org/10.3126/ije.v3i2.10641 International Journal of the Environment Vol.3(2) 2014: 276-286

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