Method for analyzing the gas jet impinging on a liquid surface

Mordasov, M. M.; Savenkov, A. P.; Chechetov, K. E.

doi:10.1134/s1063784216050170

Cited by 16 publications

(8 citation statements)

References 18 publications

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“…By taking the longitudinal section at the position of the central axis, the water–air cloud maps of the hydraulic structural sections of each case in stable state were obtained, as shown in Figure 5. It can be seen that the simulation reproduces the general pattern of water aeration in the overflow weir, such as impinging jet, cavity, water splash, and so forth (Mordasov et al, 2016). The water surface evolves from a relatively smooth and continuous shape to a rough and broken shape, and finally tends to in stability.…”

Section: Analysis Of Hydraulic Characteristics Of Hydraulic Structure...mentioning

confidence: 88%

Aeration strength analysis of overflow weir in siphon well based on numerical simulation of water–air two‐phase flow

Liu,

Lin,

Huang

et al. 2023

River

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The phenomenon of water aeration is serious after the overflow weir in the siphon well at the cooling water circulation system of coastal power plants. At present, designing special hydraulic structures is an effective way to reduce the intensity of aeration. In this paper, three engineering structure schemes were designed, and the three‐dimensional Realizable k–ε turbulence model was used. The volume of fluid method was introduced to capture the free water surface, and the unstructured grid was used to construct the two‐phase turbulent flow field. The aeration concentration and pressure distribution, obtained by numerical simulation, were basically consistent with the physical model test results. The results showed that the flow field at the orifice plates of cases 1 and 2 changed drastically, and the turbulent kinetic energy downstream of the orifice plate decreased with the increase of the number of holes. As for case 3, it showed that the high‐speed water flow fell into the water cushion pool, tumbling and sucking up a lot of air, and the turbulent kinetic energy and Reynolds stress were significantly greater than the other two cases. The hydraulic structure changed the cavitation characteristics of the downflow water, and the sequence of aeration concentration of the horizontal section was case 3 > case 1 > case 2. The aeration concentration was only 9.18%–17.86% in case 2. The aeration concentration at stable time is expressed as a function of the relative water depth y/y90 and the turbulent diffusion coefficient D. The distribution formula of aeration concentration was established, and its validity was verified by literatures. The results of this study will provide a certain reference for in‐depth analysis of water–air mixing motion characteristics, and simultaneously, it will have a guiding significance for the design of siphon well defoaming engineering.

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Section: Analysis Of Hydraulic Characteristics Of Hydraulic Structure...mentioning

confidence: 88%

Aeration strength analysis of overflow weir in siphon well based on numerical simulation of water–air two‐phase flow

Liu,

Lin,

Huang

et al. 2023

River

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“…The balance equation on the keyhole wall can be expressed as 4 where ρ g is the gas density at the liquid surface, v g is the velocity of the gas in the jet prior to the collision with the surface of the liquid, ρ L and σ L are the density and the surface tension of the liquid, h 0 is the keyhole depth, R kh is the radius of curvature of the liquid surface at the keyhole depth h 0 (Mordasov et al 2016).…”

Section: T =σL Bmentioning

confidence: 99%

Comparative study on the behavior of keyhole in analogy welding and real deep penetration laser welding

Hao

Chen

Jin

et al. 2022

Preprint

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In deep penetration laser welding, the behavior of keyhole has an important influence on the welding quality. As it is difficult to directly observe the keyhole during metal laser welding, theoretical analysis and numerical simulation methods are common-used methods in studying the keyhole behavior, which cannot provide the direct real information of the keyhole behavior. In this paper, a method of analogy welding is proposed, in which high speed gas is used to blow the liquid to generate keyhole. Relevant process experiments are conducted to explore the keyhole behavior in the analogy welding and real deep penetration laser welding. The pressure balance of keyhole both in analogy welding and real deep penetration laser welding are analyzed. The laws obtained in analogy welding and real deep penetration laser welding are similar, which indicates that studying the keyhole formation and maintenance principle using the analogy welding method proposed in this paper may be helpful to deeply understand the keyhole formation and maintenance mechanism in real deep penetration laser welding.

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“…A more recent analytical work based on a conformal mapping approach was done by He & Belmonte (2010), who analysed the cavity shape without requiring it to be small. Mordasov, Savenkov & Chechetov (2016) employed the balance equations for forces at the gas–liquid interface and not the balance equation for pressure as was used in most previous studies and obtained good agreement with experiments. Despite previous analytical approaches, detailed understanding of the cavity instability mechanisms is still missing.…”

Section: Introductionmentioning

confidence: 99%