PIV study of large-scale flow organisation in slot jets

Shestakov, M. V.; Дулин, В. М.; Tokarev, M. P.; Sikovsky, Dmitrii Ph.; Маркович, Д. М.

doi:10.1016/j.ijheatfluidflow.2014.10.027

Cited by 22 publications

(23 citation statements)

References 37 publications

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“…The flow characteristics of the impinging jet depend on the nozzle shape, the Reynolds number at the exit of the jet, the distance from the nozzle to the impingement plate, and the impinging angle (the angle between the center axis of the jet nozzle and the impingement plate), etc. In order to study the flow structure of impinging jet, domestic and foreign scholars have used hot wire anemometer, laser Doppler velocimeter, particle image velocimetry and other technologies for experimental research [1][2][3][4][5], and different turbulence models are also used for numerical calculation [6][7][8]. According to the impinging angle, the submerged water jet flow can be divided into vertical impinging jet (θ = 90 • ) and oblique impinging jet (0 • < θ < 90 • ).…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Normal Impinging Water Jet at Different Impinging Height, Based on Wray–Agarwal Turbulence Model

et al. 2020

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As a kind of water jet technology with strong impinging force and simple structure, the submerged impinging water jet can produce strong scouring action on subaqueous sediments. In order to investigate the flow field characteristics and impinging pressure of submerged impinging water jets at different impinging heights, the Wray-Agarwal (W-A) turbulence model is used for calculation. The velocity distribution and flow field structure at different impinging heights (1 ≤ H/D ≤ 8), and the impinging pressure distribution at the impingement plate under different Reynolds numbers (11, 700 ≤ Re ≤ 35100) are studied. The results show that with the increase of the impinging height, the diffusion degree increases and the velocity decreases gradually when the jet reaches the impingement region. The fluid accelerates first and then decelerates near the stagnation point. The maximum impinging pressure and the impinging pressure coefficient decrease with the increase of the impinging height, but the effective impinging pressure range remains unchanged. In this paper, the distribution characteristics of the impinging pressure in the region of the impingement plate at different heights are clarified, which provides theoretical support for the prediction method of the impinging pressure.

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Section: Introductionmentioning

confidence: 99%

Numerical Study of the Normal Impinging Water Jet at Different Impinging Height, Based on Wray–Agarwal Turbulence Model

et al. 2020

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“…The theoretical solution of the plane turbulent free jet is a statistically two-dimensional flow [20][21][22][23] with dominant mean motion in the stream-wise (X) direction, jet spreading in the lateral (Y) direction and zero entrainment in the span-wise (Z) direction. Briefly, a free jet can be divided into three regions [24]: an 'initial' or 'core' region, a 'transition' or 'interaction' region and a 'developed' or 'self-similarity' or 'far-field' region ( Fig.…”

Section: Physics Of the Free Jetmentioning

confidence: 99%

Analysis of FDS 6 Simulation Results for Planar Air Curtain Related Flows from Straight Rectangular Ducts

Beji

Liu

et al. 2017

Fire Technol

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CFD results are discussed for jet flows through a straight square duct, which is an interesting configuration in the context of air curtain flows for smoke and heat control in buildings in case of fire. The CFD package Fire Dynamics Simulator, Version 6.0.1, is used. Special focus is given to the impact of the inlet boundary condition on the flow field in the near-field region. Investigation of different orifice configurations (W = 2 cm width, variable span-wise length), including calculations inside a straight square duct (2 cm × 2 cm, with variable length) ahead of the air orifice, reveals a small vena contracta effect when the orifice is flush with a solid boundary, leading to an acceleration of the flow in the symmetry plane in the near-field region. The vena contracta effect disappears if the co-flow at the nozzle exit is aligned with the jet. More important is the effect of the duct length (precursor domain length, serving as method to generate inflow turbulent conditions for the main computation): imposing a top hat velocity profile, a sufficiently long duct (i.e., L = 20W) is required for the flow to become fully developed at the orifice. The CFD results confirm an analytical correlation for the ratio of the entrance length to the hydraulic diameter of the duct as function of the Reynolds number, provided the duct width is used as characteristic length scale. Using a sufficiently fine mesh, i.e., 10 cells across the characteristic dimension of the nozzle, the evolution of the mean and RMS stream-wise velocity along the centerline, as well as their profiles across the nozzle width, are shown to be captured accurately in the CFD results

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“…It seems appropriate to study heat and mass transfer processes, occurring at the implementation of these technologies. In particular, it is possible to conduct research using complex software and hardware systems, specialized data processing algorithms, panoramic methods and numerical models [8][9][10].…”

Section: Disadvantagesmentioning

confidence: 99%

Thermal Treatment of Industrial Wastewater

Vysokomornaya

Balakhnina

Shikhman

2015

MATEC Web of Conferences

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Abstract. The paper provides an overview on the major methods of thermal wastewater treatment in the power industry. Here, we present the main advantages and disadvantages of methods based on the concentration of inorganic substances (evaporation or distillation) or the burning of organic compounds (combustion neutralization). The study suggests the possible future directions for the development of thermal wastewater treatment.

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PIV study of large-scale flow organisation in slot jets

Cited by 22 publications

References 37 publications

Numerical Study of the Normal Impinging Water Jet at Different Impinging Height, Based on Wray–Agarwal Turbulence Model

Numerical Study of the Normal Impinging Water Jet at Different Impinging Height, Based on Wray–Agarwal Turbulence Model

Analysis of FDS 6 Simulation Results for Planar Air Curtain Related Flows from Straight Rectangular Ducts

Thermal Treatment of Industrial Wastewater

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