From Dust Devil to Sustainable Swirling Wind Energy
Dust devils usually contain abundant wind energy, for example, a maximum swirling wind velocity of up to 25 m/s, with a 15 m/s maximum vertical velocity and 5 Yin et al. conducted a study on the swirling hydraulic transport of vertical pipes and found that swirling flow has an enrichment effect on particles and increases Liquid–Solid Flow Characteristics in Vertical Swirling
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Experimental Study on Flow Patterns and Pressure Drop of
The accurate flow regime characterization, phase distribution information and pressure drop data about vertical swirling flow are the basis for the optimization of Dust devils usually contain abundant wind energy, for example, a maximum swirling wind velocity of up to 25 m/s, with a 15 m/s maximum vertical velocity and 5 From Dust Devil to Sustainable Swirling Wind Energy PMC
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Numerical Simulation of Dust Lifting within Dust Devils
Smith and Leslie (1976) indicated that two kinds of swirling flow conditions can be used, the swirling velocity υ t or the vertical component of vorticity ζ, and the In this paper, based on the image processing technique, the decay law and swirl length of swirling gas-liquid flow induced by a vane-type swirler in a vertical pipe is Decay law and swirl length of swirling gas-liquid flow in a vertical
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Thermocapillary Convection of a Vertical Swirling Liquid
A new exact solution of the Oberbeck–Boussinesq equations has been presented which describes the steady-state Marangoni convection of a vertical swirling ABSTRACT. Full knowledge of gas-liquid flow in a swirl vane separator is essential for separator design and performance improvement. In this paper, three-dimensional NUMERICAL STUDY ON SWIRLING FLOW AND SEPARATION
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Attenuation of Swirling Motion of a Fire Whirl in a Vertical
Attenuation of swirling velocity of the fire whirl along the vertical fire axis was studied by including variation in axial velocity and viscous dissipation using the basic In the case of the vertical SIJ, because the swirling jet has a stronger entrainment effect on the external air flow, it can be seen that the position of the vortex Entropy Free Full-Text Numerical Simulation of Swirling
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Attenuation of Swirling Motion of a Fire Whirl in a
The reason is again having only one slit as in the experimental studies [26,27,28,29,30,31] as referred to in this paper, which is different from others [6,7,8,9,10] in having more symmetrical slits to Three non-dimensional parameters govern the flow: the jet exit Reynolds number, the swirl ratio and the Richardson number (buoyancy). The experimental apparatus consists of a vertical swirling water jet which discharges into a large tank. Moderate values of the Reynolds number are used, in the range 150 ≤ Re ≤ 600.The effect of buoyancy on vortex breakdown in a swirling jet
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Thermocapillary Convection of a Vertical Swirling Liquid
Exact solution (2) describes a vertical swirling liq- uid outside of the Coriolis force f ield [48, 49, 5 1, 52]. Substituting class (2) into system (1) transforms theflow structure and the kinetic energy of particles. It is found that the tangential velocities of the swirling pipes are clearly larger than that of the case of no blade pipe, and the swirling number decreases as the increasing of helix angle of helical blades within swirling pipe. As the decreasing of helix angle, the vorticity magnitudeEnhancement of Liquid-Solid Two-Phase Flow Through a Vertical Swirling
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Swirl decay in the gas–liquid two-phase swirling flow inside a
Developments in the characterization of vertical swirling two phase flow patterns and transition, development of swirl decay laws for two phase swirling flow with and without interfacial frictional force, report of new separation design such as the narrow tangential conduit and the assessment of two-phase swirling flows which are influenced In order to improve the efficiency and safety of vertical hydraulic transport systems for non-spherical particles, a new pipeline transport system with a tangential jet inlet is adopted in this study, and a modified non-spherical drag coefficient model is used to analyze the liquid–solid flow characteristics based on the CFD-DEM (Computational Liquid–Solid Flow Characteristics in Vertical Swirling MDPI
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Liquid–Solid Flow Characteristics in Vertical Swirling Hydraulic
In order to improve the efficiency and safety of vertical hydraulic transport systems for non-spherical particles, a new pipeline transport system with a tangential jet inlet is adopted in this study, and a modified non-spherical drag coefficient model is used to analyze the liquid–solid flow characteristics based on the CFD-DEM (Computational Fluid Dynamics Thus, the description of the decay of swirl in two phase swirling flows had been less studied in many of the previous works. However, there are new findings on the characterization of the moreSwirl decay in the gas-liquid two-phase swirling flow inside a circular
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Numerical investigation of swirling flow in cylindrical cyclones
This paper constitutes a preliminary study of the two-phase flow in a Gas–Liquid Cylindrical Cyclone (GLCC ©1) separator. A GLCC consists in a vertical pipe with a downward inclined tangential inlet. The incoming flow forms a swirling motion producing a centrifugal force. The gas and liquid are thus separated due to both Recently, swirling flow patterns generated by a vane-type swirler have been investigated as well. In vertical pipes: bubbles in the bubbly flow move to the pipe center leading to the transition to a gas column flow (Liu and Bai 2019b; Liu et al. 2020a); in the slug flow, dispersed bubbles in the liquid slug move to the pipe center and Taylor The effect of swirl on transition from churn flow to annular flow
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Jiarong Zhang's research works Shanghai Jiao Tong University
2.3+ billion citations. Jiarong Zhang's 5 research works with 24 citations and 211 reads, including: Flow pattern transition and void fraction prediction of gas-liquid flow in helically coiled tubes.Experiments of gas–liquid swirling annular flows in a vertical pipe of diameter D = 30 mm were carried out to obtain interfacial and wall friction factors, f i and f w, based on a three-fluid model.The liquid phase was two kinds of glycerol-water solutions with the kinematic viscosity ν L of two or four times larger than that of water. . Experimental Axial development of air–water annular flow with swirl in a vertical
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Experimental study of gas-liquid flow patterns and void fraction in
Experimental study on flow patterns and transition criteria for vertical swirling gas-liquid flow. Int. J. Multiphase Flow (2020) Z. Ma et al. Comparative investigation of liquid film thickness and interfacial wave properties of swirling gas-liquid flows. Chemical Engineering Science, Volume 213, 2020, Article 115407.vortex breakdown, swirling jet, buoyancy 1 Introduction Vortex breakdown (VB) is a remarkable phenomenon which may occur in swirling flows. It is characterized by a sudden deceleration of the flow near the axis and the formation of a stagnation point accompanied by the divergence of the stream surface. Downstream of theThe effect of buoyancy in controlling vortex breakdown in swirling
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Thermocapillary Convection of a Vertical Swirling Liquid
Abstract A new exact solution of the Oberbeck–Boussinesq equations has been presented which describes the steady-state Marangoni convection of a vertical swirling liquid in the shear flow of a viscous incompressible liquid. The velocity field of the nonuniform vortical liquid flow is studied in detail. It is shown that there are stagnation tal study is to explore the effect of buoyancy on vortex breakdown (VB) in swirling jets. Three non-dimensional parameters govern the flow: the jet exit Reynolds number, the swirl ratio and the Richardson number (buoyancy). The experimental apparatus consists of a vertical swirling water jet which discharges into a large tank.The effect of buoyancy on vortex breakdown in a swirling jet
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Effect of water level on performance of swirl-vane separator and steam
Swirl-vane separator and steam dryer work as primary and secondary separator in PWR SG to supply the dry-saturation steam for the turbines to generate electricity. In this paper, steam-water two-phase experiment is conducted to investigate the effect of water level on the separation efficiency, moisture carryover (MCO) and pressure Excessive counterrotating swirl could lead to motor overload, which can cause the pump to trip or in case of absence of suitable motor protection device, it could lead to stator burn. Hsu and Brennen ( 2002) showed that an increase in inlet swirl is destabilizing for both the normal and rotodynamic forces on the pump.Full article: Experimentally determined effect of swirl on the
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School of Mechanical Engineering, Shanghai Jiao Tong University
【6】Liu, L., Bai, B. F. Flow regime identification of swirling gas-liquid flow using image processing technique and neural networks. Chemical Engineering Science 199, 588-601 (2019). 【7】Liu, L., Bai, B. F. A mechanistic model for the prediction of swirling annular flow pattern transition. Chemical Engineering Science 199, 405-416 (2019).Interfacial and wall friction factors of swirling annular fl ow in a vertical pipe, Nucl. Eng. Des. 330 (2018) 97 105 . [36] S.W. Chang, T.L. Yang, Forced convective fl ow and heat transfer(PDF) Effect of swirl on fluctuation of pressure drop in a gas–liquid
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