Numerical simulation of the modulated flow pattern for vertical upflows by the phase separation concept

Chen, Qicheng; Xu, Jinliang; Sun, Defeng; Cao, Zhen; Xie, Jian; Feng, Xi‐Qiao

doi:10.1016/j.ijmultiphaseflow.2013.05.014

Cited by 24 publications

(4 citation statements)

References 19 publications

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“…Chen et al [34] verified the flow structure by multiscale flow simulation. The promoted liquid mass and momentum exchange explains the largest heat transfer coefficients for vertical upflow compared with other flow inclinations.…”

Section: Condensation Heat Transfer Dependent On Inclination Anglesmentioning

confidence: 98%

Condensation heat transfer of R245fa in tubes with and without lyophilic porous-membrane-tube insert

Xie

Cheng

et al. 2015

International Journal of Heat and Mass Transfer

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Section: Condensation Heat Transfer Dependent On Inclination Anglesmentioning

confidence: 98%

Condensation heat transfer of R245fa in tubes with and without lyophilic porous-membrane-tube insert

Xie

Cheng

et al. 2015

International Journal of Heat and Mass Transfer

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“…Cleaning of electronic chips, handling of powders, oil and gas production, ventilation systems, diseases transmission, pneumatic conveying, pesticide transportation (Sehmel, 1980;Middletich, 1981;Nicholson, 1988;Soepyan et al 2016) are just a few examples. Understanding of particle behavior in these processes is of great significance to the design and operation of related equipment (Chen et al 2013;Zhang et al 2008). In addition, nuclear waste often exists in the form of liquid-solid sludges which are prone to form solid beds and can lead to the blockages in pipes and equipment, although this can be avoided by keeping the particles in a suspended state during their transportation.…”

Section: Introductionmentioning

confidence: 99%

Reynolds number dependence of particle resuspension in turbulent duct flows

Zhao

Wang

et al. 2018

Chemical Engineering Science

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Particle resuspension in a fully developed turbulent square duct flow is simulated using oneway coupled large eddy simulation coupled with a Lagrangian particle tracking technique for a range of bulk Reynolds numbers (36.5k, 83k and 250k) and four particle sizes ranging from 5 to 500 m (St=0.01~2415) considered. Results obtained for the single-phase flow show good agreement with experimental data. Predictions of the time-dependent particle-laden flows demonstrate that the secondary flow mainly dominates particle resuspension in the regions near the center and sidewalls of the duct. It is found that particle resuspension decreases with particle size. The smaller particles tend to be more prone to resuspension, and are resuspended for a longer duration than larger particles. The mean particle resuspension velocity is found to increase with the duct height. In addition, particle resuspension in the vertical direction increases with Reynolds number while the effect of particle size on particle resuspension decreases. The resuspension rate in the spanwise direction fluctuates more as the Reynolds number increases. It is also found that the average particle resuspension rate in the lower half of the duct is always close to 0.5, and is independent of time, particle size and Reynolds number. Based on a dynamic analysis, the drag force is found to dominate the resuspension of small particles, while the lift force tends to dominate particle resuspension with increasing particle size. For low Reynolds number (36.5k and 83k) flows, the drag force plays an important role in the upper regions of the lower half of the duct, but the lift force dominates particle behaviour in the lower regions. It can be concluded that the effects of duct height on particle behaviour decline significantly with Reynolds number.

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“…These have included wicking, using membranes and hydrophobic/hydrophilic meshes, designing the flow to contain sudden direction changes or elbows, or a combination of the above [1][2][3][4][5][6][7][8][9][10][11]. For instance, recent publications have discussed the effects of the gravity level on using flow pattern modulation to passively enhance the separation using suspended mesh cylinders [2][3][4]. Among these phase separation concepts, two categories of centrifugal force separators solid body.…”

Section: Introductionmentioning

confidence: 99%

“…At a distance r from the vortex axis the tangential velocity in this viscous region can be related to the angular velocity, ω, as V r = ωr, r ≥ a c . (2) In the outermost region of the vortex, the flow is that of an ideal inviscid fluid. In that region, the circulation, Γ, which is the integral of the velocity along a closed line encircling the vortex center, is constant everywhere and defines the vortex strength.…”

Section: Introductionmentioning

confidence: 99%

Development of a passive phase separator for space and earth applications

Loraine

Hsiao

et al. 2017

Separation and Purification Technology

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The limited amount of liquids and gases that can be carried to space makes it imperative to recycle and reuse these fluids for extended human operations. During recycling processes gas and liquid phases are often intermixed. In the absence of gravity, separating gases from liquids is challenging due to the absence of buoyancy. This paper describes development of a passive phase separator that is capable of efficiently and reliably separating gas-liquid mixtures of both high and low void fractions in a wide range of flow rates that is applicable to for both space and earth applications.

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Numerical simulation of the modulated flow pattern for vertical upflows by the phase separation concept

Cited by 24 publications

References 19 publications

Condensation heat transfer of R245fa in tubes with and without lyophilic porous-membrane-tube insert

Condensation heat transfer of R245fa in tubes with and without lyophilic porous-membrane-tube insert

Reynolds number dependence of particle resuspension in turbulent duct flows

Development of a passive phase separator for space and earth applications

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