Effects of Rayleigh-Taylor instabilities on turbulent premixed flames in a curved rectangular duct

Sykes, Joshua P.; Gallagher, Timothy P.; Rankin, Brent A.

doi:10.1016/j.proci.2020.06.146

Cited by 11 publications

(2 citation statements)

References 23 publications

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“…For ages, CC is a center of interest for many researchers and as a result, various shapes of ducts are invented for smoothing human lifestyle. Some references are given here to explain the importance of CC so that readers can get an obvious notion about it; these are Chanda et al [1] and Sykes et al [2] for curved rectangular duct (CRD), Mondal et al [3] and Khan et al. [4] for curved square duct (CSD), Miles and Bessaih [5] for cylindrical duct.…”

Section: Introductionmentioning

confidence: 99%

A Computational Study on Fluid Flow and Energy Distribution through a Bending Duct with Longitudinal Vortex Generation

Adhikari¹,

Chanda²,

Mondal³

2022

Preprint

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Since studies on fluid flow and energy dissemination through a bending duct (BD) plays prodigious contribution to both engineering and industrial standpoint, scientists have paid considerable attention to disclose new features of fluid flow through a BD. Taking this factor into account, the current work explores a computational approach on flow features and energy distribution through a bending rectangular duct of curvature 0.001 applying a spectral-based numerical scheme over a wide domain of the Dean number 0 < Dn ≤ 3000.The geometry is such that the bottom and outer side walls are thermally heated while the other walls are kept in room temperature. Newton-Raphson iteration method (N-R method) is adopted to inspect the branching structure of steady solutions (SS) which explores that there exist four branches of asymmetric steady solutions comprising 2- to 14-vortex solutions. The axial and secondary velocity distribution for each branch is investigated through different grid points by using different values of Dn. Unsteady flow characteristics are analyzed exquisitely by performing time-advancement of the solutions and flow transition is well determined by analyzing power spectrum (P-S) of the solutions. Axial flow, secondary flow, and temperature profiles have been depicted in accordance with Dn to wander the flow pattern, and it is predicted that the time-dependent flow (TDF) consists of asymmetric 2- to 10-vortex solutions. Finally, convective heat transfer (CHT) is analyzed by acquiring temperature contours for various types of physically realizable solutions. The study also demonstrates that centrifugal force comprehensively influences the fluid nature of the bending channel and CHT is more intensified due to chaotic phenomena of the flow.

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Section: Introductionmentioning

confidence: 99%

A Computational Study on Fluid Flow and Energy Distribution through a Bending Duct with Longitudinal Vortex Generation

Adhikari¹,

Chanda²,

Mondal³

2022

Preprint

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“…(Sykes et al 2020, Kumar et al 2008. In this case, the presence of an interface of fresh reactants and combustion products with temperature and density gradients results in the spikes and bubbles of Rayleigh-Taylor instability.…”

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confidence: 99%

Shock induced variable density flows in the vacuum microchannel: I. medium laser fluence

Lugomer

2023

Phys. Scr.

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Laser-matter interactions with metal target cause plasma explosion and shock accelerated variable density flow instabilities in the Semiconfined Configuration (SCC). Their study gives deeper insight into the flow instabilities present in all microchannel devices. Blast wave motion along the SCC microchanel causes the KH instability and formation of vortex filaments for the critical Reynolds number. Apearing in all shear layers – it affects the fluid transport efficiency. Shear layer acceleration causes a Raleigh-Taylor (RT) instability. Oriented bubble growth by discrete merging indicates anisotropic RTI mixing. Similar RTI flame instability appears in the conversion of chemical energy into electricity affecting microcombustion efficiency. Another case of anisotropic RTI is the flow boiling for cooling of chips and microelectronic devices. The RTI boiling which appears for the critical heat flux is based on rising surface vapor columns (oriented bubble growth) with liquid counterflow (spike prominences) for the critical wavelength at density interface. The RT bubble merging graph trees determine turbulent mixing which affects the heat transfer rates. Bottom-wall turbulent flow in the SCC microchannel causes streaks of the low momentum fluid and formation of hairpin vortex packets with lattice organization. This makes possible to quantify parameters responsible for the evolution of hairpin vortex packets in the microchannel devices. Appearing from the low to the high Reynolds numbers they affect the transport properties, control of the fluid motion, enhancement of mixing, or the separation of fluids. Fluid particle ejecta – thin supersonic jets - evolve into long needle-like jets which start spiraling, helical pairing and swirling in the field of thermal gradients. Such instabilities appear in the microcombustion flame instability and in the space micropropulsion systems. Oscillating and spiral flames appear in the presence of thermal gradient in the microchannel, due to the combined effects of thermal gradient fields and the mixture flow rates.

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The influences of acceleration on compressible Rayleigh–Taylor instability with non-equilibrium effects

Lai,

Lin,

Gan

et al. 2023

Computers & Fluids

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Effects of Rayleigh-Taylor instabilities on turbulent premixed flames in a curved rectangular duct

Cited by 11 publications

References 23 publications

A Computational Study on Fluid Flow and Energy Distribution through a Bending Duct with Longitudinal Vortex Generation

A Computational Study on Fluid Flow and Energy Distribution through a Bending Duct with Longitudinal Vortex Generation

Shock induced variable density flows in the vacuum microchannel: I. medium laser fluence

The influences of acceleration on compressible Rayleigh–Taylor instability with non-equilibrium effects

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