Study of velocity field at model sideweir using visualization method

Novak, Gorazd; Steinman, Franc; Müller, Matej; Bajcar, Tom

doi:10.1080/00221686.2011.648766

Cited by 6 publications

(5 citation statements)

References 16 publications

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“…The fact that the impact of the surface tension is negligible at such model dimensions and that the main channel was already shown in previous studies [12], in which the measurements of the hydraulic conditions at a side weir with a similar length as used in this study made in a 150 mm wide channel were additionally verified with the measurements made in a wider channel (0.5 m) with a longer side weir. The research showed a good correlation between the measurements in the narrow and wider channel.…”

Section: Experimental Set-upsupporting

confidence: 78%

“…The method has been verified with a number of cases; it has already been used for the measurements of the velocity fields of a free surface flow specific for a case of a side weir. It was found that the most suitable tracer for the measurements in such cases are hydrogen bubbles, which can be produced with galvanization [12]. It has been shown that the uncertainty of the method is ±5 % [11].…”

Section: Methodsmentioning

confidence: 99%

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Influence of the Operating and Geometric Characteristics of a Bottom-hinged Flap Gate on the Discharge Coefficient of a Side Weir

Müller¹,

Novak²,

Steinman

et al. 2015

SV-JME

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Bottom-hinged flap gates on side weirs are often used for the regulation of flow diversion in case of water abstraction for a variety of needs. In this study, a new equation for the discharge coefficient of a bottom-hinged flap gate on a side weir was proposed on the basis of discharge measurements. The equation was divided into two parts. The first part covers the impact of the sharp-crested side weir and the second the influence of the position and the width of the flap gate. In this manner, the discharge coefficient can be calculated with other authors' equations for a sharp-crested side weir, which then must be multiplied by the new proposed coefficient. Very good agreement was found between the obtained discharge coefficients and the one calculated with the proposed equation. Furthermore, the results were compared with the equations of other authors for the discharge coefficients of sharp-and broad crested side weirs. The agreement was found to be very good. Additionally, measurements of water levels along the edge of the flap gate and measurements of the velocity field were carried out with a computer-aided visualization method. From these measurements, it was possible to show that the contraction of the water jet varies with the gate-opening angle. It was also found that the side weir with a flap gate has the most favorable hydrodynamic shape around the gate-opening angle of 33°, where the discharge coefficient reaches its maximum.

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Section: Experimental Set-upsupporting

confidence: 78%

Section: Methodsmentioning

confidence: 99%

Influence of the Operating and Geometric Characteristics of a Bottom-hinged Flap Gate on the Discharge Coefficient of a Side Weir

Müller¹,

Novak²,

Steinman

et al. 2015

SV-JME

Self Cite

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show abstract

“…1 -25.56 0.2-1 0.03-2.14 247 [2] 0.23-0.41 0.14-0.49 0.7-1.8 0.03-0.3 18 [3] 0 The results of this study and [5] are more logic about the effect of h 1 /p on the discharge coefficient of a rectangular side weir, as h 1 /p increases the resistance of weir on the flow over the weir decreases and greater values of C d are expected. However, more experiments are needed to explore the reason of this contradiction.…”

mentioning

confidence: 98%

“…It is clear that the authors proposed equations (Eqs. (12) and (14) of the original paper) do not predict accurately the discharge for all data sources, especially for data of [2]. According to the dimensional analysis of the original paper, the following relation was assumed to estimate the discharge coefficient of a rectangular side weir.…”

mentioning

confidence: 99%

Comments on “Discharge coefficient of rectangular sharp crested side weirs part I: Traditional weir equation” by Bagheri, Kabiri-Samani, AR, and Heidarpour, M.

Mehraein

Ghodsian

2015

Flow Measurement and Instrumentation

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“…Another field of application includes large hydraulic structures such as irrigation and flood management systems where local flow velocities are of interest and would not be practical to be measured with conventional flow metering devices or simulated adequately enough due to potential complex flow phenomena [2]. Recently, Novak et al [3] and [4] used flow visualization to study flow phenomena in side weirs. Furthermore, visualization methods are also preferred for multiphase flow analysis, especially in biological and chemical engineering, where other methods are too intrusive or do not allow measurements on the micro scale.…”

Section: Introductionmentioning

confidence: 99%