Simplified procedure for design of long-throated flumes and weirs

Vatankhah, Ali R.; Mahdavi, Amirmehran

doi:10.1016/j.flowmeasinst.2012.04.007

Cited by 18 publications

(3 citation statements)

References 9 publications

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“…Las simulaciones realizadas en AnsysCFD ® Academic R18.0 comprueban las condiciones presentadas tanto en campo como en laboratorio. En la investigación actual se introduce un factor de corrección (K) en función de la pendiente que permite utilizar los dispositivos con alta precisión para diferentes secciones de control (Vatankhah, 2012). Según los resultados de la modelación matemática (AnsysCFD) el valor de presión que el flujo ejerce en la canaleta se encuentra en un rango comprendido entre 1 Pa a 2 Pa. La mayor presión que ejerce el flujo de agua se encuentra en el fondo de la canaleta y se encuentra en un rango entre -1.64 Pa -1.65 Pa. En el resultado de los análisis de dinámica de fluidos computacional de las canaletas se evidencia que en la sección de la estrangulación o garganta ocurre un flujo crítico seguido de un flujo supercrítico en una corta distancia y un salto hidráulico inmediatamente aguas abajo en la canaleta Parshall, tal como lo propone Samani (2017).…”

Section: Figura 3 Curva De Calibración Acunclassified

Análisis de tres elementos de aforo para sistemas de riego en la provincia de Loja, Ecuador

Ontaneda¹,

Benavides-Muñoz²

2018

cyt

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El objetivo del estudio fue analizar los tres elementos típicos de aforo en pequeños canales y acequias para riego y generar modelos matemáticos que gobiernan su comportamiento hidrodinámico. Los dispositivos que se analizaron fueron la canaleta Parshall (CP), el aforador con cuello (AC) y el aforador sin cuello (AS). La investigación se desarrolló en tres fases. En las primeras etapas se determinó las descargas entre 0 L/s – 10 L/s, el número de mediciones fue de nueve por cada elemento, con un total de 54 medidas y finalmente en el banco hidráulico del laboratorio se generaron las ecuaciones de calibración y curvas características de los medidores de caudal. Los resultados obtenidos muestran una variación entre 0.001 L/s a 0.002 L/s para descargas menores a 2 L/s; y, de 0.008 L/s a 0.063 L/s para gastos entre 2 L/s y 10 L/s. Se establecieron las ecuaciones y curvas de calibración para la determinación del caudal en L/s en función de la altura del tirante en mm. La simulación del flujo en los aforadores obedeció a un comportamiento del flujo bajo régimen supercrítico.

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Section: Figura 3 Curva De Calibración Acunclassified

Análisis de tres elementos de aforo para sistemas de riego en la provincia de Loja, Ecuador

Ontaneda¹,

Benavides-Muñoz²

2018

cyt

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“…Wahl et al, 2005, based mainly on the WinFlume program (Bautista et al, 2020, in its latest version), the methodology presented in this paper directly provides the parameters of the control section with a more accurate procedure than. for example, that of Vantakhah and Mahdvi (2012).…”

Section: Introduction and Objectivesmentioning

confidence: 99%

Design of a Long-Throated Flume in a Drainage Channel of a Rice Cultivated Plot

Moreno-Pérez,

Pérez-Ardoy,

Roldán-Cañas

2024

Preprint

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In the plot under study, rice is grown under anaerobic conditions by means of flood irrigation that maintains a constant water depth during most of the crop cycle. Thus, water requirements reach a very high volume of about 12,000 m3/ha. At the outlet there is a drainage channel where there are no measuring devices. Its control will allow us to establish practices to reduce the high water consumption. We have designed a long-throated flume that can cover the entire range of flow rates to measure, between 0.02 and 0.05 m3/s in this case. Since the drainage channel has a trapezoidal cross section and is built on land, the throat of the flume will also be trapezoidal to ease the transition between the two sections and reduce head losses. A new procedure has been developed that allows to directly design the dimensions of the narrowed section, side slope and bottom width, by previ-ously choosing the modular limit, the sill height and the length of the throat more in accordance with the characteristics of the channel where the flume is to be installed. The analysis of the obtained results demonstrates the accuracy and feasibility of the presented procedure.

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“…With the wide application of U-channels, there have been many achievements in research and technology related to flow discharge measurement devices, such as Parshall flumes [6,7], long-throated flumes [8,9], wing-shaped measuring flumes [10,11], cutthroat flumes [12,13], metrical flumes with straight walls [14], and parabolic throat flumes [15]. Their flow discharge measuring principle is to build special flow discharge measurement equipment in the channel, and the critical flow is generated at a specific position, so that the relationship between flow discharge and water level is not affected by downstream flow conditions, and the upstream water level can be measured to achieve flow discharge.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulations of Hydraulic Characteristics of A Flow Discharge Measurement Process with A Plate Flowmeter in A U-Channel

Gao

Jia

et al. 2019

Water

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The use of a flow discharge measuring device in irrigated areas is the key to utilizing water in a planned and scientific manner and to developing water-saving irrigation techniques. In this study, a new type of flow discharge measuring device for a U-channel—a plate flowmeter—was designed, and then the hydraulic characteristics of the flow discharge measurement process using the plate flowmeter were simulated and experimentally verified by adopting an RNG (Renormalization Group) k-ε turbulence model based on Flow-3D software. The results showed that in the process of measuring flow discharge with the plate flowmeter, the transverse flow velocity, the vertical flow velocity, and the relationship between the measured flow discharge and the deflection angle of the angle-measuring plate were basically consistent with the experimental results. The maximum relative errors were 5.3%, 6.2%, and 6.8% respectively, proving that it was feasible to use Flow-3D software to simulate the hydraulic characteristics of the flow discharge measurement process using the plate flowmeter. The vertical flow velocities at the center of the upstream section of the channel increased gradually from the bottom of the channel to the free water surface. The vertical flow velocities at the center of the downstream section of the channel first increased and then decreased from the bottom of the channel to the free water surface, and the maximum vertical flow velocity was located at a position below the free water surface. The maximum range of influence of the plate flowmeter on the flow disturbance in the channel was from 0.75 m upstream to 1.24 m downstream of the plate flowmeter. These results can provide a theoretical basis for optimizing the structural parameters of a plate flowmeter.

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Simplified procedure for design of long-throated flumes and weirs

Cited by 18 publications

References 9 publications

Análisis de tres elementos de aforo para sistemas de riego en la provincia de Loja, Ecuador

Análisis de tres elementos de aforo para sistemas de riego en la provincia de Loja, Ecuador

Design of a Long-Throated Flume in a Drainage Channel of a Rice Cultivated Plot

Numerical Simulations of Hydraulic Characteristics of A Flow Discharge Measurement Process with A Plate Flowmeter in A U-Channel

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