Heat transfer in the hydraulic jump region of circular free-surface liquid jets

Askarizadeh, Hossein; Ahmadikia, Hossein; Ehrenpreis, Claas; Kneer, Reinhold; Pishevar, Ahmadreza; Rohlfs, Wilko

doi:10.1016/j.ijheatmasstransfer.2019.118823

Cited by 16 publications

(60 citation statements)

References 38 publications

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“…In addition, we refer to the satisfactory numerically simulated results obtained by Askarizadeh et al. (2020) and Wang & Khayat (2021), who also used a similar numerical configuration.…”

Section: Results and Validationmentioning

confidence: 92%

“…They found that the jump remains essentially steady while the downstream flow continues to spread. This aspect was also captured numerically by Askarizadeh et al (2019) and Wang & Khayat (2021). In contrast, the present study examines the evolution of the developed jump as we accelerate the flow from one steady state to another, after the film has already reached the disk edge.…”

Section: Introductionmentioning

confidence: 86%

“…Practically, this should not affect the solution much since the viscosity of the gas phase is usually negligible compared with that of the liquid, and the configuration is laminar. In addition, we refer to the satisfactory numerically simulated results obtained by Askarizadeh et al (2020) and Wang & Khayat (2021), who also used a similar numerical configuration.…”

Section: The Transient Response Of the Flow In The Fully Developed Vi...mentioning

confidence: 99%

“…Numerous numerical simulation studies of the free-surface flow and hydraulic jump were conducted, but were mostly limited to steady flow (Passandideh-Fard, Teymourtash & Khavari 2011; Fernandez-Feria, Sanmiguel-Rojas & Benilov 2019; Todkari & Kate 2019; Askarizadeh et al. 2020; Wang & Khayat 2021).…”

Section: Introductionmentioning

confidence: 99%

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The transient spread of a circular liquid jet and hydraulic jump formation

2022

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The transient flow of a circular liquid jet impinging on a horizontal disk, and the hydraulic jump formation, are examined theoretically and numerically. The interplay between inertia and gravity is particularly emphasised. The flow is governed by the thin-film equations, which are solved along with a force balance across the jump. The unsteadiness of the flow is caused by a linearly accelerating jet from an initial to a final steady state. To validate the predicted boundary-layer flow evolution, an analytical development is conducted for small distance from impingement, and for small time. In addition, the predictions of the film profile and jump location are compared against numerical simulation for the transient flow, and are further validated against experiment for steady flow. The evolutions of the film thickness and the wall shear stress in the developing boundary-layer region are found to be similar to those reported for a fluid lying on a stretching surface. The flow responds to the jet acceleration quasi-steadily near impingement but exhibits a long-term transient behaviour near the jump. Analysis of the jump evolution is considered in the range 5 < Fr < 40 for the Froude number (based on the jet radius and velocity). For Fr < 10, the jump reaches the final state instantly when the jet acceleration ceases. At higher Froude number, the jump settles at a later time, exhibiting an overshoot in the thickness due to the dominance of inertia.

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“…In addition, we refer to the satisfactory numerically simulated results obtained by Askarizadeh et al. (2020) and Wang & Khayat (2021), who also used a similar numerical configuration.…”

Section: Results and Validationmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 86%

Section: The Transient Response Of the Flow In The Fully Developed Vi...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The transient spread of a circular liquid jet and hydraulic jump formation

2022

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“…OpenFOAM offers two methods for improving the surface sharpness. The Multidimensional Universal Limiter with Explicit Solution (MULES) [29] is a widely used scheme to reduce the smearing [30,31]. Recently, a geometric VOF method has also been implemented as a part of the isoAdvector [32] solver, which was used in present study.…”

Section: Methodsmentioning

confidence: 99%

Assessment of CFD Model Performance for Flows around a Hydraulic Structure of Complex Geometry

Grivalszki

Fleit

Baranya

et al. 2020

Period. Polytech. Civil Eng.

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Computational Fluid Dynamics (CFD) modeling has become a widely used research tool in the hydraulic engineering community, however, for many problems the numerical model setup and even the selection of the suitable hydrodynamic solver is still a challenging task. This is the case for fine scale analysis of flow features around hydraulic structures of complex geometry, where generation of the 3D grid, application of the correct turbulence modeling approach, or modeling of the free surface all require extensive experience and knowledge. The aim of this paper is to perform a numerical hydrodynamic experiment for a hydraulic structure with complex geometry to assess the model performance, in terms of grid resolution, grid refinement methods as well as turbulence modeling. The open source modeling environment of OpenFOAM is tested and validated against laboratory measurements, moreover, practical recommendations are made for future applications of the numerical solver.

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The influence of azimuthally varying edge conditions on the hydraulic jump

Wang

Khayat

2022

Acta Mech

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Heat transfer in the hydraulic jump region of circular free-surface liquid jets

Cited by 16 publications

References 38 publications

The transient spread of a circular liquid jet and hydraulic jump formation

The transient spread of a circular liquid jet and hydraulic jump formation

Assessment of CFD Model Performance for Flows around a Hydraulic Structure of Complex Geometry

The influence of azimuthally varying edge conditions on the hydraulic jump

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