The NETmix reactor: Pressure drop measurements and 3D CFD modeling

Fonte, Cláudio P.; Leblebici, M. Enis; Dias, Madalena M.; Lopes, José Carlos B.

doi:10.1016/j.cherd.2013.07.014

Cited by 33 publications

(31 citation statements)

References 8 publications

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“…The energy conservation equation, neglecting viscous dissipation, is given by

\frac{\partial true(ρ c_{P} T true)}{\partial t} + \nabla \cdot true(ρ c_{P} \overset{υ}{true} T true) = \nabla \cdot true(κ \nabla T true)

where

T

is the temperature,

c_{P}

is the local fluid heat capacity and

κ

is the local fluid thermal conductivity. Viscous dissipation is neglected due to NETmix's high energy efficiency demonstrated previously . From the observations made by Fonte et al, in the operational simulation range of this study, an energy dissipation of less than 1 mW is expected, in the chaotic regime.…”

Section: Three‐dimentional Cfd Modelingsupporting

confidence: 52%

“…Viscous dissipation is neglected due to NETmix's high energy efficiency demonstrated previously. 15 From the observations made by Fonte et al, 15 in the operational simulation range of this study, an energy dissipation of less than 1 mW is expected, in the chaotic regime. These equations are solved for the following boundary conditions: no-slip condition is assumed in the walls of the domain, t wall 50; simplified uniform velocity profile is applied to the network inlet channels; parallel flow condition is applied at the network's outlet channels by imposing a simplified constant and uniform pressure profile, p out 5p 0 ; periodic boundary conditions are imposed at the symmetry surfaces of the halfchambers of the NUB model; either constant-wall temperature, T wall 5T 0 or constant-wall heat flux, _ q wall 5 _ q 0 , is imposed at both top and bottom surfaces.…”

Section: Governing Equations and Boundary Conditionssupporting

confidence: 49%

“…Observed chaotic oscillation frequency increases with the increase of the Reynolds number. 15 These hydrodynamic regime transitions were observed in simulations for both sets of boundary conditions.…”

Section: Netmix Heat Transfer Performancementioning

confidence: 66%

“…The presence of these dynamic vortices that have the capacity to interact with each other deforms the fluid elements even further, resulting in an increase of heat transfer rate through the walls. Observed chaotic oscillation frequency increases with the increase of the Reynolds number …”

Section: Three‐dimentional Cfd Modelingmentioning

confidence: 93%

“…Mixing in the NETmix has been evaluated (both experimentally and using CFD modeling) showing that mixing can be effectively and efficiently controlled. In terms of its energy performance, the power number and the Z factor of NETmix were determined based on experimental measurements of the pressure drop, as well as CFD simulations, and proved to be competitive with existing mixers, delivering considerably larger mixing power than stirred tanks using impellers. The NETmix technology has also already been industrially established when applied as a chemical reactor for the continuous production of nanoparticles of hydroxyapatite, a calcium phosphate that is predominantly found in teeth and bones within the human body, with controlled particle size and morphology, high surface areas, purity and nano‐crystallinity …”

Section: Introductionmentioning

confidence: 99%

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Heat transfer performance of NETmix—A novel micro‐meso structured mixer and reactor

et al. 2017

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NETmix is a novel static mixing technology consisting on a network of unit cells, comprising chambers interconnected by channels. To assess the heat transfer capacity of NETmix, the NUB model was implemented to perform hydrodynamics and heat transfer simulations. Due to the periodic nature of the NETmix structure, two central chambers and six half‐chambers were found to be sufficient to be representative of the whole network. The Nusselt numbers were determined based on the CFD simulations, and when compared with theoretical results for laminar flow between parallel plates, 3–5 times higher Nusselt number values were obtained with NETmix. This observed heat transfer rate enhancement, makes it suitable for fast reactions where heat transfer is crucial. Finally, results obtained from this study show that NETmix presents a heat transfer capacity one order of magnitude greater than microreactors, and 2–5 orders of magnitude greater than the most commonly used devices in industry. © 2017 American Institute of Chemical Engineers AIChE J, 63: 2496–2508, 2017

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“…The energy conservation equation, neglecting viscous dissipation, is given by

\frac{\partial true(ρ c_{P} T true)}{\partial t} + \nabla \cdot true(ρ c_{P} \overset{υ}{true} T true) = \nabla \cdot true(κ \nabla T true)

where

T

is the temperature,

c_{P}

is the local fluid heat capacity and

κ

Section: Three‐dimentional Cfd Modelingsupporting

confidence: 52%

Section: Governing Equations and Boundary Conditionssupporting

confidence: 49%

Section: Netmix Heat Transfer Performancementioning

confidence: 66%

Section: Three‐dimentional Cfd Modelingmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Heat transfer performance of NETmix—A novel micro‐meso structured mixer and reactor

et al. 2017

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Digital Fabrication in Catalytic Technology

Ameloot

2017

Nanotechnology in Catalysis

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Computational Fluid Dynamics Model of Two‐Phase Flow in NETmix Reactors

et al. 2021

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A computational fluid dynamics (CFD) modeling approach was developed to study the mixing of two immiscible liquids in NETmix reactors. A two-dimensional two-phase CFD model based on the Euler-Euler approach with the volumeof-fluid (VOF) method was implemented in a reduced physical domain from the imposition of periodic boundary conditions. The fluids modeled were sunflower oil and water. The VOF modeling was validated by comparison with experimental results. CFD results predicted the actual flow regimes and overall flow patterns for each phase at three Reynolds numbers. The validation demonstrated the 2D CFD model to describe the physics of two-phase flow in the NETmix reactors. This model can be applied to design studies for liquid-liquid extraction or gas-liquid reactors, where the operation flow regime is crucial.

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The NETmix reactor: Pressure drop measurements and 3D CFD modeling

Cited by 33 publications

References 8 publications

Heat transfer performance of NETmix—A novel micro‐meso structured mixer and reactor

Heat transfer performance of NETmix—A novel micro‐meso structured mixer and reactor

Digital Fabrication in Catalytic Technology

Computational Fluid Dynamics Model of Two‐Phase Flow in NETmix Reactors

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