Formation of a thin circulation layer in a two-fluid rotating flow

Naumov, I. V.; Glavny, V. G.; Sharifullin, B. R.; Shtern, V. N.

doi:10.1103/physrevfluids.4.054702

Cited by 25 publications

(3 citation statements)

References 21 publications

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“…The slip was confirmed in the further studies of VB in two-fluid flows 19 – 22 . The discovery of slip means that all numerical results, which were obtained under the continuity condition for all components of velocity at the interface, must be revised.…”

Section: Introductionsupporting

confidence: 55%

Dual vortex breakdown in a two-fluid whirlpool

Skripkin

Sharifullin

Naumov

et al. 2021

Sci Rep

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Looking for an optimal flow shape for culture growth in vortex bioreactors, an intriguing and impressive structure has been observed that mimics the strong swirling flows in the atmosphere (tornado) and ocean (waterspout). To better understand the flow nature and topology, this experimental study explores the development of vortex breakdown (VB) in a lab-scale swirling flow of two immiscible fluids filling a vertical cylindrical container. The rotating bottom disk drives the circulation of both fluids while the sidewall is stationary. The container can be either sealed with the still top disk (SC) or open (OC). As the rotation strength (Re) increases, a new circulation cell occurs in each fluid—the dual VB. In case SC, VB first emerges in the lower fluid at Re = 475 and then in the upper fluid at Re = 746. In case OC, VB first emerges in the upper fluid at Re = 524 and then in the lower fluid at Re = 538. The flow remains steady and axisymmetric with the interface and the free surface being just slightly deformed in the studied range of Re. Such two-VB swirling flows can provide efficient mixing in aerial or two-fluid bioreactors.

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Section: Introductionsupporting

confidence: 55%

Dual vortex breakdown in a two-fluid whirlpool

Skripkin

Sharifullin

Naumov

et al. 2021

Sci Rep

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“…12 In this article authors established the suitable flow similarities for the conversion of governing three-dimensional flow equations. Naumov et al 13 investigated the thin layer in interface of two immiscible fluids flow of swirl motion with the help of numerical technique. Hayat et al 14 analyzed the 3D rotating flow of nanofluid in porous medium by using Darcy-Forchheimer model.…”

Section: Introductionmentioning

confidence: 99%

Swirling flow of fluid containing (SiO₂) and (MoS₂) nanoparticles analyze via Cattaneo-Christov theory

Ahmed

Khan

2022

Journal of Applied Biomaterials & Functional Materials

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Investigation of heat transport mechanism in swirling flow of viscous fluid containing silicon dioxide [Formula: see text] and molybdenum disulfide [Formula: see text] nanoparticles is performed. The flow is engendered due to stretchable rotating cylinder which immersed in infinite fluid. The boundary layer assumption is applied to simplify the governing equations of the problem. The theory of Cattaneo-Christov for thermal energy transportation is employed in the present phenomenon under the heat and mass constraints. The flow is also influenced by Lorentz force. The results for flow field, temperature, and concentration field are produced by employing the bvp4c numerical technique to the similar differential equations. According to the observations, it is noted that in the presence of Lorentz force the reduction in velocity field of the nanofluid occurs. The thermal and solutal relaxation phenomena also declines the energy transport in nanofluid flow. The outcomes are validated through the comparison with previous published studies.

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“…For a more detailed comparison of the regions of existence of recirculating flows in a cylindrical container under different types of boundary conditions at the fixed end of the cylinder, diagrams of the modes of existence of the axial region of the return flow and the adhesion of the "bubble" to the interface of the two media were constructed. To establish these limits, a series of experiments were conducted with different regime parameters, and the results were compared with the data from experimental and numerical simulations from[4,8,9,12].The appearance of the area of return flow of the "bubble" was determined visually by increasing the thickness of the trace of particles on the axis of the cylinder in a vertical section with a step on the Reynolds number equal to 20. In a similar way (visually), the junction of the return flow region to the interface and the subsequent change in the topologythe collapse of the "bubble" into two leaves was recorded.…”

mentioning

confidence: 99%

The structure of the confined swirling flow under different phase boundary conditions at the fixed end of the cylinder

Naumov

Kashkarova

Mikkelsen

et al. 2020

Thermophys. Aeromech.

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Formation of a thin circulation layer in a two-fluid rotating flow

Cited by 25 publications

References 21 publications

Dual vortex breakdown in a two-fluid whirlpool

Dual vortex breakdown in a two-fluid whirlpool

Swirling flow of fluid containing (SiO₂) and (MoS₂) nanoparticles analyze via Cattaneo-Christov theory

The structure of the confined swirling flow under different phase boundary conditions at the fixed end of the cylinder

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Formation of a thin circulation layer in a two-fluid rotating flow

Cited by 25 publications

References 21 publications

Dual vortex breakdown in a two-fluid whirlpool

Dual vortex breakdown in a two-fluid whirlpool

Swirling flow of fluid containing (SiO2) and (MoS2) nanoparticles analyze via Cattaneo-Christov theory

The structure of the confined swirling flow under different phase boundary conditions at the fixed end of the cylinder

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Product

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Swirling flow of fluid containing (SiO₂) and (MoS₂) nanoparticles analyze via Cattaneo-Christov theory