Particle deposition from aerosol flow inside a T-shaped micro-mixer

Heim, Michael; Wengeler, Robert; Nirschl, Hermann; Kasper, Gerhard

doi:10.1088/0960-1317/16/1/010

Cited by 17 publications

(11 citation statements)

References 12 publications

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“…He discussed the state-of-the-art computational methods for determining particle motion and deposition. Heim, Wengeler, Nirschl, and Kasper (2006) studied the particle losses to the inside walls of a T-shaped micro-reactor as a function of operating conditions. They determined the losses by on-line concentration measurement techniques, using monodisperse sodium chloride particles and vitamin-E-acetate droplets with sizes in the range of 10-700 nm.…”

mentioning

confidence: 99%

Particle transport in a small square enclosure in laminar natural convection

Akbar

Rahman

Ghiaasiaan

2009

Journal of Aerosol Science

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mentioning

confidence: 99%

Particle transport in a small square enclosure in laminar natural convection

Akbar

Rahman

Ghiaasiaan

2009

Journal of Aerosol Science

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“…The connection at the top of the picture is used as outlet, the connection at the left side is blocked the inlets are the smallest channels where most particles are deposited. The role of the Stokes number St for particle deposition is described by Heim et al (2006). The relative particle loss in the investigated microreactors is displayed in Fig.…”

Section: Particle Depositionmentioning

confidence: 99%

Simulation and characterization of microreactors for aerosol generation

Kockmann

Dreher

Engler

et al. 2007

Microfluid Nanofluid

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This paper shows the application of T-shaped micromixers for the generation of aerosols with nanoscale droplets by the mixing of a hot vapor-gas mixture with a cold gas. The fast mixing within a T-shaped micromixer leads to a high supersaturation of the vapor and therefore to an instantaneous, homogeneous nucleation and particle growth. Different mixer geometries, mixing ratios, and gas temperatures have been investigated by numerical simulation to yield optimum mixing results over a wide range of operational parameters. Optimized microreactor geometries were designed and fabricated in silicon with Pyrex glass lids. Special attention was paid to thermal insulation and particle deposition at the channel walls. This concerns not only the mixing chip, but also the design of the fluidic mount with only few bends and corners. Initial experimental results for particle deposition and aerosol generation are presented. High temporal temperature gradients up to 10 6 K/s lead to a rapid condensation and forming of nanosized particles with a mean diameter of 20-50 nm and a narrow size distribution.Keywords Aerosol Á Nanoparticle Á Micromixer Á Microreactor Á Process engineering Nomenclature A M cross section area of mixing channel (m 2 ) C friction correction factor (-) d h hydraulic diameter (m) d p particle diameter (m) h specific enthalpy (J/kg) L channel length (m) L m characteristic mixing length (m) L m90 mixing length 90% mixed (m) P momentum density (kg/m 2 s) Re Reynolds number (-) St Stokes number (-) T temperature (K or°C) DT L spatial temperature gradient (K/m) DT s temporal temperature gradient (K/s) u (fluid) velocity (m/s) " u mean (fluid) velocity (m/s) _ V volume flow (m 3 /s) x spatial coordinate along channel (m) Y mass fraction of vapor in gas (kg/kg) a _ V mixing quality (-) g dynamic viscosity (kg/s m) kheat conductivity (W/m 2 K) q density (kg/m 3 ) q P particle density (kg/m 3 ) r _ V max ðTÞ maximal standard deviation of temperature over volume flow (K) s m characteristic mixing time (s)

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“…Their cavity had two cold walls (the top and the left walls) and two heated walls (the bottom and the right walls). Heim et al [5] studied the particle losses to the inside walls of a T-shaped micro-reactor as a function of operating conditions. Numerical investigation was performed by Golkarfard et al [6] to study the transport and deposition of aerosol particles in laminar mixed-convection flow in a lid-driven cavity with two heated obstacles.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of deposition and dispersion of aerosols in a concentric annulus

Ganj¹,

Khaki²,

Gerailinejad³

2017

ntmsci

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Abstract:In the present analysis, we studied numerically the effect of natural convection on deposition and dispersion of aerosols in a concentric horizontal annulus by means of control volume based finite element method. The governing equation is assumed for laminar, incompressible and 2D fluid flow while a Lagrangian description was used for simulation of spherical, solid particles immersed in the flow. The inner cylinder was under a constant heat flux and the outer one was maintained at a constant temperature (T c ). The Drag, Lift, Brownian and gravity forces were considered in the equation of particle motion. The results showed that Rayleigh number and increment of the aspect ratio change the rate of deposition as showed in the figures.

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Particle deposition from aerosol flow inside a T-shaped micro-mixer

Cited by 17 publications

References 12 publications

Particle transport in a small square enclosure in laminar natural convection

Particle transport in a small square enclosure in laminar natural convection

Simulation and characterization of microreactors for aerosol generation

Numerical investigation of deposition and dispersion of aerosols in a concentric annulus

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