Liquid recirculation and bubble breakup beneath ventilated gas cavities in downward pipe flow

Thorpe, Rex B.; Evans, G. R.; Zhang, K; Machniewski, P.

doi:10.1016/s0009-2509(01)00309-8

Cited by 16 publications

(27 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our analysis showed that the maximum axial re-circulation velocity in the centre of the vortex ring was directly proportional to the mean velocity in the annulus at the base of the cylindrical bluff body, the ventilated cavity or the Taylor bubble. The proportionality constant for all cases was found to be approximately 0.38 confirming the value proposed by Thorpe et al (2001). …”

supporting

confidence: 83%

“…The model also agreed well with the data of van Hout et al (2002) for a Taylor bubble rising in stagnant liquid in a 0.025 m internal diameter pipe. The CFX simulations of Thorpe et al (2001) carried out for a 0.050 m internal diameter pipe, agreed well with the experimental data of the cylindrical bluff body, the ventilated cavity and the data obtained by van Hout et al (2002) when correlating the results in the appropriate dimensionless form. Our analysis showed that the maximum axial re-circulation velocity in the centre of the vortex ring was directly proportional to the mean velocity in the annulus at the base of the cylindrical bluff body, the ventilated cavity or the Taylor bubble.…”

supporting

confidence: 76%

“…The results for the time-averaged velocity confirmed the formation of a toroidal vortex remarkably similar to the vortex formed below the bluff body. The eye of the vortex and the end of the re-circulation region were found at an axial location below the ventilated cavity of 0.78 and 1.35D, respectively, i.e., almost identical to the results for the bluff body.The LDV results of the cylindrical bluff body and the ventilated cavity were compared with the fully predictive model of the velocity distribution in the vortex proposed by Thorpe et al (2001) and good agreement was found in both cases. The model also agreed well with the data of van Hout et al (2002) for a Taylor bubble rising in stagnant liquid in a 0.025 m internal diameter pipe.…”

mentioning

confidence: 94%

“…The LDV results of the cylindrical bluff body and the ventilated cavity were compared with the fully predictive model of the velocity distribution in the vortex proposed by Thorpe et al (2001) and good agreement was found in both cases. The model also agreed well with the data of van Hout et al (2002) for a Taylor bubble rising in stagnant liquid in a 0.025 m internal diameter pipe.…”

mentioning

confidence: 94%

See 3 more Smart Citations

Liquid re-circulation in turbulent vertical pipe flow behind a cylindrical bluff body and a ventilated cavity attached to a sparger

Sotiriadis

Thorpe

2005

Chemical Engineering Science

View full text Add to dashboard Cite

supporting

confidence: 83%

supporting

confidence: 76%

mentioning

confidence: 94%

mentioning

confidence: 94%

See 2 more Smart Citations

Liquid re-circulation in turbulent vertical pipe flow behind a cylindrical bluff body and a ventilated cavity attached to a sparger

Sotiriadis

Thorpe

2005

Chemical Engineering Science

View full text Add to dashboard Cite

“…In horizontal two-phase flow, the largest bubble is found very close to the upper wall, at a position where the time averaged radial velocity profile is far from uniform [4]. According to two studies [142,143], a critical Weber number, We c , can be used to determine the maximum stable bubble size in a fluid flow field as:…”

Section: Maximum Bubble Diametermentioning

confidence: 99%

A Critical Review of Advanced Experimental Techniques to Measure Two- Phase Gas/Liquid Flow

Rahman¹,

Heidrick²,

Fleck³

2009

TOEFJ

View full text Add to dashboard Cite

Gas assisted atomization is becoming increasingly important in many industrial applications such as physical, chemical and petroleum processes. In order to achieve proper atomization it is crucial to have proper mixing of gas (air) and liquid (water) in the feeding conduit before it enters into the nozzle. The flow regime, as well as the flow pattern and structure of the flow, are some of the important parameters that describe two-phase gas/liquid flows, and identify twophase gas/liquid flow regimes. It is also desirable to know under what conditions there is a transition among the different flow regimes (dispersed, stratified, annular, annular-dispersed, slug, wavy-slug, mist-annular). Due to the existence of relative movement in the interfaces and variable interactions between two phases, two-phase gas/liquid flow is a complex transport phenomenon compared to single-phase flow. Still, there is no effective technique to identify the two-phase gas/liquid flow regimes and it is even difficult to capture the accurate flow structures in smaller conduits in turbulent flow cases. Lack of solid and comprehensive theories for predicting and calculating the pressure and void fraction variations in two-phase air/water flow situations has left engineers without essential information for proper design of two-phase flow systems. This review is an effort to explore the state of the present advanced measurement techniques in this field of research. Subsequently, some of the advanced void fraction, photonics and pressure measurement techniques and correlations for identification of two-phase gas/liquid flow regimes and bubble sizes are investigated.

show abstract

Study on droplet entrainment in the composite scrubbing–cooling chamber

Wang

Yan

Guo

et al. 2017

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

A cold model experimental device was established for studying droplet entrainment in the composite scrubbing-cooling chamber. The effect of the superficial gas velocity, the initial liquid flow velocity of the nozzle, and the radial position of nozzles on droplet entrainment was investigated. The experimental results show that the droplet entrainment increases with the increase of the superficial gas velocity and the flow rate of falling film, but its profile is quite mean in the radial direction in the chamber. The droplet entrainment decreases by about 40% when the number of nozzles increases from two to four. Increasing the nozzle number can make the droplet well distributed and reduce droplet entrainment. Based on the experiment data, an empirical correlation for droplet entrainment fraction is also obtained, as E ∝ Re 1.92 ·We 0.52 . The optimization study for the structure of the scrubbing-cooling chamber can provide some guidance for the industrial application.

show abstract

Liquid recirculation and bubble breakup beneath ventilated gas cavities in downward pipe flow

Cited by 16 publications

References 19 publications

Liquid re-circulation in turbulent vertical pipe flow behind a cylindrical bluff body and a ventilated cavity attached to a sparger

Liquid re-circulation in turbulent vertical pipe flow behind a cylindrical bluff body and a ventilated cavity attached to a sparger

A Critical Review of Advanced Experimental Techniques to Measure Two- Phase Gas/Liquid Flow

Study on droplet entrainment in the composite scrubbing–cooling chamber

Contact Info

Product

Resources

About