Controlling the number of vortices and torque in Taylor–Couette flow

Wen, Jun; Zhang, Wenyun; Ren, Liuzhen; Bao, Luyao; Dini, Daniele; Xi, Heng-Dong; Hu, Haibao

doi:10.1017/jfm.2020.561

Cited by 18 publications

(8 citation statements)

References 42 publications

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“…By controlling the rotating conditions, the TC flow may bifurcate to various cell modes and have different transport behaviours (Wen et al. 2020). In our study, in addition to the commonly observed two-cell mode, convection in a four-cell mode can be seen occasionally when diverse initial conditions are used.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Flow structures and heat transport in Taylor–Couette systems with axial temperature gradient

Leng

Krasnov

et al. 2021

J. Fluid Mech.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Flow structures and heat transport in Taylor–Couette systems with axial temperature gradient

Leng

Krasnov

et al. 2021

J. Fluid Mech.

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“…At least three different experiments were conducted for each electrochemical run to guarantee that the results were repeatable. Although the corrosion resistance of the coatings usually evaluated by electrochemical techniques without and with lubricated conditions [28][29][30][31], the present work focused on corrosion tests without lubricating conditions. The information gathered was judged to be statistically significant.…”

Section: Electrochemical Setupmentioning

confidence: 99%

Interfacial Microstructure and Corrosion Behaviour of Mild Steel Coated with Alumina Nanoparticles Doped Tin Composite via Direct Tinning Route

et al. 2021

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The improvement of the surface properties of ferrous metallic materials has become a crucial criterion for advanced engineering applications. The interfacial microstructure and corrosion behaviour of mild steel coated with alumina nanoparticles doped in tin composite using the direct tinning technique were investigated. A coating layer of tin composite containing different loads of Al2O3 nanoparticles (0.25 wt.%, 0.50 wt.%, 1.00 wt.% and 1.5 wt.%) was prepared and directly deposited on a mild steel substrate. This type of a direct tinning process is considered to be a simple and low-cost route for protecting metallic materials from corrosion. It was found that the thickness of both the composite layer and Fe-Sn intermetallic layer at the coated interfaces was highly affected by the presence of alumina nanoparticles that effectively inhibit the diffusion of Sn atoms into the Fe substrate. For the samples coated with lower content of alumina nanoparticles (0.25 wt.% and 0.50 wt.%), the thickness of the Fe-Sn intermetallic coating (IMC) layer is decreased due to Fe-Sn IMC suppression. Otherwise, for the addition of more alumina nanoparticles (1.00 wt.% and 1.50 wt.%), the thickness of the Fe-Sn IMC layer is slightly increased because of nanoparticle’s agglomeration and flotation. It can be reported that the presence of alumina nanoparticles in the coating layer improves, to a great extent, the corrosion resistance of Sn-composites surface on mild steel substrates. Although the tin composite coating layer with a high quantity of alumina nanoparticles (1.0 wt.%) exhibited better corrosion resistance than the other tested samples, such nanoparticle additions have become increasingly difficult to obtain. It was observed that the Al2O3 nanoparticles agglomeration and flotation that were detected in the coating surface may be related to high fraction nanoparticles loading and to the difference in the gravity for Sn and Al2O3 nanoparticles. However, based on our investigation, a coating layer that contains 0.50 wt.% alumina nanoparticles is highly recommended for achieving long lasting and high-performance corrosion resistance for coated mild steel with minimal coating layer defects.

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“…The diversity of factors influencing swirler resistance makes it impossible to assess the degree of impact of each of them separately, as this requires computing power and a numerical model describing the gas behavior within the device [16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study and Numerical Simulation of Hydrodynamic Parameters of Tangential Swirlers

et al. 2022

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This paper presents and patents new profiled- and annular-channel tangential swirlers with 1.8–3 times less hydraulic drag coefficient compared to swirlers with straight channel walls at the same flow rate, respectively. The results of numerical simulation of the gas velocity and pressure profiles for tangential swirler channels of different structures are presented. The modelling was carried out with the help of OpenFOAM software using the k-ε turbulence model. It is found that the shape of the velocity profile at the channel inlet has a decisive influence on the swirler drag coefficient. The greatest contribution to the total drag coefficient of the tangential swirler is made by the pressure drop at the channel inlet compared to the pressure drop at the channel wall and the channel outlet. The experimental dependencies of the tangential swirlers’ drag coefficient on the Reynolds number with a gas criterion of 2000–20,000 and the following structural channel parameters: width 1, 2–9 mm, height 1, 5–10 mm, number 5–45 units, inclination angle 0–45° are presented. The experimental data were compared with the modelling calculations and the convergence of data was achieved. The generalized dependence for the measurement of the hydraulic drag coefficient of three types of tangential swirlers considering the effect made by the geometric parameters (flow rate, width and height of the channel, wall inclination angle) on the pressure drop has been determined; it can be useful at the unit design stage as it allows for reducing the calculation time of the swirler parameters.

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Controlling the number of vortices and torque in Taylor–Couette flow

Abstract: Abstract

Cited by 18 publications

References 42 publications

Flow structures and heat transport in Taylor–Couette systems with axial temperature gradient

Flow structures and heat transport in Taylor–Couette systems with axial temperature gradient

Interfacial Microstructure and Corrosion Behaviour of Mild Steel Coated with Alumina Nanoparticles Doped Tin Composite via Direct Tinning Route

Experimental Study and Numerical Simulation of Hydrodynamic Parameters of Tangential Swirlers

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