Flow and mass transfer characteristics in wavy channels for oscillatory flow

Nishimura, Tatsuo; Tarumoto, Atsushi; Kawamura, Yoshiharu

doi:10.1016/0017-9310(87)90019-6

Cited by 34 publications

(1 citation statement)

References 13 publications

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“…Corrugated geometries have been studied extensively with regards to their effect on fluid mixing, 1-3 mass transfer, 4,5 and heat transfer. [6][7][8][9][10] By corrugated geometries we are referring to geometries with successive expansions and contractions.…”

Section: Introductionmentioning

confidence: 99%

Particle behavior in a turbulent flow within an axially corrugated geometry

Majal

Wittberg

Mihăescu

2021

Advances in Mechanical Engineering

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In this numerical study particle behavior inside a sinusoidal pipe geometry is analyzed. The 3D geometry consists of three identical modules, with a periodic boundary condition applied to the flow in the stream wise direction. The incompressible, turbulent gas flow is modeled using a Large Eddy Simulation (LES) approach. Furthermore, the particle dynamics are simulated using a Lagrangian point force approach incorporating the Stokes drag and slip correction factor. Four different sizes of particles, corresponding to a Stokes number less than unity, are considered along with two different inflow conditions: continuous and pulsatile. The pulsatile inflow has an associated flow frequency of 80 Hz. The fluid flow through the sinusoidal pipe is characterized by weak flow separation in the expansion zones of the sinusoidal pipe geometry, where induced shear layers and weak recirculation zones are identified. Particle behavior under the two inflow conditions is quantified using particle dispersion, particle residence time, and average radial position of the particle. No discernible difference in the particle behavior is observed between the two inflow conditions. As the observed recirculation zones are weak, the particles are not retained within the cavities for a long duration of time, thereby reducing their likelihood of agglomerating.

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Section: Introductionmentioning

confidence: 99%

Particle behavior in a turbulent flow within an axially corrugated geometry

Majal

Wittberg

Mihăescu

2021

Advances in Mechanical Engineering

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Numerical Study of Turbulent Forced Convection in a Periodically Ribbed Channel With Oscillatory Throughflow

Fusegi¹

1996

Int. J. Numer. Meth. Fluids

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Numerical computations are performed on the fully developed flow and heat transfer in a periodically ribbed channel with oscillatory throughflow. A uniform heat flux is imposed at the lower plate of the channel. An externally sustained pressure gradient varies sinusoidally in time. A low‐turbulent‐Reynolds‐number version of the k–ϵ two‐equation model of turbulence is invoked, together with a preferential dissipation modification, to predict the complex turbulent flow field. Computed results indicate that much heat transfer enhancement is expected by increasing the Womersley number, which measures the relative strength of the oscillatory motion to the viscous effects.

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Gas transfer characteristics of a novel membrane bioreactor

Beeton

Millward

Bellhouse

et al. 1991

Biotech & Bioengineering

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We show the design features of a membrane bioreactor based on pulsatile flow across dimpled membranes. Results show an enhanced mass transfer of air of at least five-fold magnitude as compared with flat membranes. An increased working volume form 20 mL to 120 mL reduced the k(L)A at a given Reynolds number because of axial mixing of fluid from the deoxygenated end chamber. The bioreactor was used to supply air to a hybridoma mammalian cell line, and the calculated oxygen uptake showed that high-density cultures could be maintained in a 20 mL, single-dimpled cultures could be maintained in a 20 mL, single-dimpled membrane system. Indirect aeration of a 2 L continuous stirred tank reactor, by a double-membrane system, showed that air could be supplied to mammalian cells at cell densities of approximately 4 x 10(6) /mL.

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Flow and mass transfer characteristics in wavy channels for oscillatory flow

Cited by 34 publications

References 13 publications

Particle behavior in a turbulent flow within an axially corrugated geometry

Particle behavior in a turbulent flow within an axially corrugated geometry

Numerical Study of Turbulent Forced Convection in a Periodically Ribbed Channel With Oscillatory Throughflow

Gas transfer characteristics of a novel membrane bioreactor

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