Detachment of a bubble anchored to a vertical cylindrical surface in quiescent liquid and grid generated turbulence

Wang, Guichao; Sathe, Mayur J.; Mitra, Subhasish; Jameson, Graeme J.; Evans, Geoffrey M.

doi:10.1002/cjce.22085

Cited by 12 publications

(4 citation statements)

References 27 publications

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“…The bubble is considered symmetrical around the vertical axis parallel to the nozzle. [ 16 ] At this instant, a simple force balance allows us to predict the characteristic diameter D of the bubble after detachment, supposing it has a spherical shape. First, the buoyancy force

F_{normalb}

, pointing upward, tends to detach the gaseous bubble from the nozzle

\begin{matrix} F_{b} = g false(ρ_{l} - ρ_{g} false) V_{b} # \end{matrix}

where

V_{normalb}

is the volume of the bubble,

g = 9.81

m s −2 is the gravitational acceleration, and

ρ_{normall}

(

ρ_{normalg}

) is the density of the liquid (gas).…”

Section: Methodsmentioning

confidence: 99%

“…The bubble is considered symmetrical around the vertical axis parallel to the nozzle. [16] At this instant, a simple force balance allows us to predict the characteristic diameter D of the bubble after detachment, supposing it has a spherical shape. First, the buoyancy force F b , pointing upward, tends to detach the gaseous bubble from the nozzle…”

Section: Acoustic-pressure-induced Detachment Of Gas Bubbles In a Liquidmentioning

confidence: 99%

“…In figure 3, an idealised situation, just before detachment of the bubble is depicted. The bubble is considered symmetrical around the vertical axis parallel to the nozzle [16]. At this instant, a simple force balance allows us to predict the characteristic diameter 𝐷 of the bubble after detachment, supposing it has a spherical shape.…”

Section: Acoustic-pressure-induced Detachment Of Gas Bubbles In a Liquidmentioning

confidence: 99%

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Acoustic‐Pressure‐Assisted Engineering of Aluminum Foams

et al. 2021

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Shaping metals as a foam modulates their physical properties, enabling attractive applications where lightweight, low thermal conductivity, or acoustic isolation are desirable. Adjusting the size of the bubbles in the foams is particularly relevant for targeted applications. Herein, a method with a detailed theoretical understanding of how to tune the size of the bubbles in aluminum melts in situ via acoustic pressure is provided. The description is in full agreement with the high‐rate 3D X‐ray radioscopy of the bubble formation. The study with the intriguing results on the effect of foaming on electrical resistivity, Seebeck coefficient, and thermal conductivity from cryogenic to room temperature is complemented. Compared with bulk materials, the investigated foam shows an enhancement in the thermoelectric figure of merit. These results herald promising application of foaming in thermoelectric materials and devices for conversion of thermal energy.

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F_{normalb}

, pointing upward, tends to detach the gaseous bubble from the nozzle

\begin{matrix} F_{b} = g false(ρ_{l} - ρ_{g} false) V_{b} # \end{matrix}

where

V_{normalb}

is the volume of the bubble,

g = 9.81

m s −2 is the gravitational acceleration, and

ρ_{normall}

(

ρ_{normalg}

) is the density of the liquid (gas).…”

Section: Methodsmentioning

confidence: 99%

“…The bubble is considered symmetrical around the vertical axis parallel to the nozzle. [16] At this instant, a simple force balance allows us to predict the characteristic diameter D of the bubble after detachment, supposing it has a spherical shape. First, the buoyancy force F b , pointing upward, tends to detach the gaseous bubble from the nozzle…”

Section: Acoustic-pressure-induced Detachment Of Gas Bubbles In a Liquidmentioning

confidence: 99%

Section: Acoustic-pressure-induced Detachment Of Gas Bubbles In a Liquidmentioning

confidence: 99%

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Acoustic‐Pressure‐Assisted Engineering of Aluminum Foams

et al. 2021

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“…However, the effect of the grid parameters on the turbulent field was ignored. Melina [23], Ahmadi-Baloutaki [24], and Wang [25] applied the gridgenerated turbulence directly, without studying the turbulence characteristics.…”

Section: State Of the Artmentioning

confidence: 99%

Numerical and Experimental Studies on Grid-Generated Turbulence in Wind Tunnel

Liu¹,

Zhang²,

Wu³

et al. 2017

JESTR

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The grid-generated turbulence in wind tunnel is commonly applied in aerodynamic performance experiments of various industrial structures. However, the characteristics and application conditions of the grid-generated turbulence in the wind tunnel are often affected by the grid shape and the test position, respectively. Therefore, in order to clarify the influence of the grid shape and the test position on the grid-generated turbulence in wind tunnel, a computational fluid dynamics (CFD) numerical study on the turbulence generated by two different grids was presented herein, with the wind tunnel experimental validation. Firstly, time histories of the wind speed at 19 monitoring points behind the grid in wind tunnel were collected. Secondly, the entire turbulent field generated by two different grids was simulated using CFD. Then, the characteristics of the turbulence generated by the grids in wind tunnel were investigated. Finally, the accuracy of the CFD simulations compared with the wind tunnel test was studied. Results show that the grid blockage and the interference effect lead to a significant increase of 200% in the turbulence intensity near the grid. Moreover, the grid-generated turbulence conforms to the isotropic assumption only after a specific distance of 2.0-4.0 m from the grid. In addition, CFD errors are generally within 15%-20% of the corresponding measurements in the wind tunnel. This study provides guidance for selecting the installation location of the structure model in a wind tunnel.

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How do you write and present research well? Q4 – Do not metastasize with metadiscourse

2015

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In the classic writing style, writers recognize that readers are competent and will recognize the truth as you lead them through your work. Soggy prose seeks “to argue for the truth.”[1] Your text should read like a conversation rather than a lecture. Match each sentence with one of the cardinal sins of writing to the left.[2,3] (Multiple choices possible) 1 Hedgingb)In general these results show that a system with zero‐cost identities does not require centralized allocation of identities to encourage cooperation.[4]2 Signpostingf)In this section we shall evaluate the rate of recombination for nonequilibrium conditions.[5]3 Redundantc)Here we report our new results on the samarium‐arsenide.[6]4 Self‐conscious, 6 Boostinge)Whether established pests are suitable for attempted eradication is extremely controversial.[7]5 Narcissismd)More recently researchers have attempted to quantify the effects of anxiety on foreign language learning.[8]6 Boostinga)These results are extremely significant statistically and compare favorably with validation studies.[9]

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Detachment of a bubble anchored to a vertical cylindrical surface in quiescent liquid and grid generated turbulence

Cited by 12 publications

References 27 publications

Acoustic‐Pressure‐Assisted Engineering of Aluminum Foams

Acoustic‐Pressure‐Assisted Engineering of Aluminum Foams

Numerical and Experimental Studies on Grid-Generated Turbulence in Wind Tunnel

How do you write and present research well? Q4 – Do not metastasize with metadiscourse

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