Bubble effect on pressure drop reduction in upward pipe flow

Nouri, Mahtab; Motlagh, Saber Yekani; Navidbakhsh, Mahdi; Dalilhaghi, M.; Moltani, A.A.

doi:10.1016/j.expthermflusci.2012.08.022

Cited by 16 publications

(8 citation statements)

References 28 publications

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“…Hitherto, this research has focused on the injection of air bubbles over flat plates and in straight tubes with a minimal consideration for the investigation of the pressure drop reduction in coiled tubes. When investigating the drag reduction inside a channel Nouri et al [19] reported that bubble injection can be used to decrease the flow transfer costs. In fact, they reported a 35% reduction in the pressure drop in turbulent upward pipe flow with the maximum experimental volumetric void fraction of 9%.…”

Section: Figure 1: Schematic Representation Of Helical Pipe Charactermentioning

confidence: 99%

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A review on the two-phase pressure drop characteristics in helically coiled tubes

Fsadni

Whitty

2016

Applied Thermal Engineering

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Due to their compact design, ease of manufacture and enhanced heat transfer and fluid mixing properties, helically coiled tubes are widely used in a variety of industries and applications. In fact, helical tubes are the most popular from the family of coiled tube heat exchangers. This review summarises and critically reviews the studies reported in the pertinent literature on the pressure drop characteristics of two-phase flow in helically coiled tubes. The main findings

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Section: Figure 1: Schematic Representation Of Helical Pipe Charactermentioning

confidence: 99%

“…The thermo-physical properties of the nanofluids were obtained using the equations given in Eqs. (17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28) [21,31].…”

Section: Copper Oxide Nanoparticles and Oilmentioning

confidence: 99%

A review on the two-phase pressure drop characteristics in helically coiled tubes

Fsadni

Whitty

2016

Applied Thermal Engineering

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“…Mamori and Fukagata (2011) performed a sinusoidal profile of the wall-normal body force in a fully developed turbulent channel flow to investigate skin-friction drag reduction effect of traveling wave-like as the wall-normal Lorenz force. Nouri et al (2013) used non-conservative force to model the effects of microbubbles on pressure drop in turbulent channel flow. However, adding the force to the momentum equations is not limited to these applications.…”

Section: Introductionmentioning

confidence: 99%

Numerical Method to Predict Slip Length in Turbulent Channel Flow

Nouri

Rastan

Sekhavat

2016

JAFM

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In the present research work, we introduce a new method for estimating the slip length on superhydrophobic surfaces. Hence, a dynamic force is added to momentum equations and velocity boundary condition is rewritten in a new form. Laminar and turbulent channel flows are considered and two force functions are used with different profiles to investigate their effects on results. The turbulent channel flow is considered at Re 180   and the Large Eddy Simulation (LES) method has been applied to analyze this flow. All results indicate that this method can predict the streamwise slip length with a good accuracy, which is comparable with the Navier's method. So, using this numerical solution and also measuring pressure drop and mass flow rate in the channel, slip length can be calculated. Consequently, the errors and difficulties of slip length measurements in typical methods such as AFM and µPIV would be eliminated.

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“…Tom and Liu [5] conducted experiments on the pressure drop in high-viscosity liquids containing FBs. Nouri et al [6] investigated the effect of FBs on the pressure drop generated by frictional losses in upward pipe flows, and reported a reduction in pressure drop. The above studies described "turbulent drag reduction" for FB mixtures in relatively high Reynolds numbers.…”

Section: Introductionmentioning

confidence: 99%

“…The above studies described "turbulent drag reduction" for FB mixtures in relatively high Reynolds numbers. For instance, Reynolds number ≤ 2.1 × 10 8 (Sanders et al [1]), Reynolds number ≤ 1.0 × 10 7 (Shen et al [2]), Reynolds number ≤ 1.7 × 10 4 (Murai et al [3]), and Reynolds number ≤ 3.0 × 10 3 (Nouri et al [6]) were used. Additionally, their used FB sizes were relative large scales (Although a minimum particle diameter was 44 μm [2], almost all FB sizes were more than 100 μm).…”

Section: Introductionmentioning

confidence: 99%

Flow Properties of Ultra-Fine Bubble Mixtures Passing through Micro-Apertures

Ushida¹,

Hasegawa²,

Narumi³

et al. 2015

JFCMV

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The flow properties of fine bubble mixture flows are investigated and reported. Few previous studies have focused on ultra-fine bubble (UFB) mixtures, which contain sub-micrometer sized bubbles. In this study, UFB mixtures of water and glycerol solution are passed through micro-sized slits and capillaries, and the resultant pressure drops are evaluated in comparison with those for water and aqueous glycerol alone. The experimentally measured pressure drop for slits (≤51 μm) and capillaries (≤81 μm) is less for UFB mixtures than for water and aqueous glycerol alone. This phenomenon is considered in terms of interface behavior and attributed to the electric interaction between an electric double layer and the UFBs. Furthermore, numerical observation for slip wall conditions is conducted, and the results for UFB mixtures agree with the predicted values for slip wall conditions.

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Bubble effect on pressure drop reduction in upward pipe flow

Cited by 16 publications

References 28 publications

A review on the two-phase pressure drop characteristics in helically coiled tubes

A review on the two-phase pressure drop characteristics in helically coiled tubes

Numerical Method to Predict Slip Length in Turbulent Channel Flow

Flow Properties of Ultra-Fine Bubble Mixtures Passing through Micro-Apertures

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