Impinging Air Jets on Flat Surfaces at Low Reynolds Numbers

Simionescu, Ştefan-Mugur; Tanase, Nicoleta-Octavia; Broboana, Diana; Bălan, Corneliu

doi:10.1016/j.egypro.2017.03.1083

Cited by 10 publications

(6 citation statements)

References 8 publications

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“…The gas jet is ejected from the nozzle into the environmental medium until it strikes a certain wall. The development characteristics of the jet can be divided into three typical zones, namely, the free jet zone, the impinging zone, and the wall jet zone [32,33]. The zoning diagram is shown in Figure 3.…”

Section: Mathematical Model Of Development Stagementioning

confidence: 99%

“…Combining with the mathematical model that illustrates the continuous process of coal breaking by a gas jet, when the jet pressure is greater than the critical failure pressure of coal, erosion holes will be formed. After combining equations ( 9), ( 11), (32), and (43), the criteria for determining whether a gas jet can break coal can be obtained:…”

Section: Geofluidsmentioning

confidence: 99%

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Gas Jet Coal-Breaking Behavior: An Elliptical Crushing Theoretical Model

Wang

Yang

et al. 2021

Geofluids

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Coalbed methane (CBM) is a source of clean energy and has been recovered in past decades all over the world. Gas dynamic disaster is the primary disaster in outburst coal, and methane drainage plays a key role in eliminating this danger. As an efficient technology, a gas jet is widely used in CBM development and methane drainage. In this work, the full impinging process of coal and rock fracturing by a supersonic gas jet was studied. To understand how jet parameters affect coal and rock fracturing results, an elliptical crushing theoretical model was proposed. In addition, a laboratory experiment was designed to examine the proposed model, and four key parameters affecting the fracturing results were studied. The results show that different from the monotonic variation of theoretical values, there is a turning point in the variation of experimental values under some parameters. Considering the influence of the depth and radius of the erosion pit, the rock-breaking effect is better when the nozzle size is 2.75 Ma. The optimal target distance is 30 mm, and the impact pressure of a gas jet should be continuously increased in order to achieve certain rock-breaking effects under the impact of the jet.

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Section: Mathematical Model Of Development Stagementioning

confidence: 99%

Section: Geofluidsmentioning

confidence: 99%

Gas Jet Coal-Breaking Behavior: An Elliptical Crushing Theoretical Model

Wang

Yang

et al. 2021

Geofluids

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“…In this study, the stages of the jetting regime are investigated experimentally and numerically by a computational fluid dynamics model implemented in ANSYS Fluent. Numerical simulations have been an important tool and have supplied extensive information about various studied phenomena [9,10], including liquid jets and their breakup [11,12]. By use of the CFD model, we determine the velocity distributions during drop formation and pinch-off at various sections throughout the liquid jet.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigations of the jetting regime

Tanase

Rasuceanu

Bălan

2023

IOP Conf. Ser.: Earth Environ. Sci.

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In this paper we highlight the first stages of liquid injection through a capillary nozzle prior to the jet formation regime. We emphasize the asymmetry of water-air interface at the beginning of the injection of liquid and the axial symmetry which follows when the jet is fully formed. Numerical simulations are performed in order to estimate the relaxation of the velocity distribution of the liquid as it leaves the capillary nozzle. The plug flow condition for low-viscosity liquid jets is investigated in relation with the parabolic velocity distribution in the nozzle. The numerical data is also used to characterize the flow during the drop formation and pinch-off, both driven by the action of surface tension.

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“…An oriented liquid or gaseous impinging jet released against a surface provides an effective and flexible way for transferring large amounts of thermal energy or mass between a given surface and the fluid in many practical applications and developing devices [ 1 , 2 ]. Impinging jets are one of the essential components in many industrial processes, such as surface coating, mixing [ 3 ], pollution dispersion, ventilation [ 4 ], drying [ 5 ], wind engineering [ 6 , 7 ], and direct lift propulsion systems in vertical/short take-off and landing aircraft [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

“…Reynolds-averaged Navier–Stokes (RANS), large eddy simulation (LES), direct numerical simulation (DNS), and the lattice Boltzmann method (LBM) have been considered as prospective and valuable tools to provide comprehensive information concerning flow dynamics in both space and time to complement the experimental results concerning impinging jets [ 2 ]. Unfortunately, numerical analysis of impinging jets seems to be demanding due to their complex mechanisms and the presence of a stagnation point, high streamline curvature, and the development of a boundary layer at a plain or curved impinged surface [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

A Fuzzy Logic Approach for the Reduction of Mesh-Induced Error in CFD Analysis: A Case Study of an Impinging Jet

Sosnowski

Krzywański

Ščurek

2019

Entropy

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A crucial step in any computational fluid dynamics (CFD) analysis is the discretization of the domain because it influences truncation errors, numerical stability, and the convergence of the model. Therefore, the appropriate selection of numerical mesh parameters crucially contributes to the reliability of the obtained results. Therefore, an innovative approach to reducing the mesh-induced error in CFD analysis of an impinging jet using fuzzy logic is proposed within the paper. The flow parameters were obtained using the Reynolds-averaged Navier–Stokes calculations, based on the mesh parameters obtained using the grid convergence index and fuzzy logic, were compared to each other and to experimental research results. The fuzzy logic approach to define mesh parameters turned out to be a very promising method as it allowed us to obtain results that are qualitatively and quantitatively comparable to commonly used but far more time-consuming methods.

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Impinging Air Jets on Flat Surfaces at Low Reynolds Numbers

Cited by 10 publications

References 8 publications

Gas Jet Coal-Breaking Behavior: An Elliptical Crushing Theoretical Model

Gas Jet Coal-Breaking Behavior: An Elliptical Crushing Theoretical Model

Experimental and numerical investigations of the jetting regime

A Fuzzy Logic Approach for the Reduction of Mesh-Induced Error in CFD Analysis: A Case Study of an Impinging Jet

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