On the breakup of an air bubble injected into 
a fully developed turbulent flow. Part 2. 
Size PDF of the resulting daughter bubbles

Martı́nez-Bazán, C.; Montañés, J. L.; Lasheras, Juan C.

doi:10.1017/s0022112099006692

Cited by 211 publications

(152 citation statements)

References 19 publications

(40 reference statements)

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“…Hinze [26] used the definition that 95% of the air is contained in bubbles with a diameter less than dc and the calculated turbulent energy dissipation rate ε for Deane's [18] data was much smaller. Garrett et al [24] used the results of Martínez-Bazán et al [30,31] and established a one-to-one relationship between the local dissipation rate and bubble size. …”

Section: Bottom Turbulent Dissipation Ratementioning

confidence: 99%

Development of Bubble Characteristics on Chute Spillway Bottom

Bai¹,

Liu²,

Feng³

et al. 2018

Water

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Chute aerators introduce a large air discharge through air supply ducts to prevent cavitation erosion on spillways. There is not much information on the microcosmic air bubble characteristics near the chute bottom. This study was focused on examining the bottom air-water flow properties by performing a series of model tests that eliminated the upper aeration and illustrated the potential for bubble variation processes on the chute bottom. In comparison with the strong air detrainment in the impact zone, the bottom air bubble frequency decreased slightly. Observations showed that range of probability of the bubble chord length tended to decrease sharply in the impact zone and by a lesser extent in the equilibrium zone. A distinct mechanism to control the bubble size distribution, depending on bubble diameter, was proposed. For bubbles larger than about 1-2 mm, the bubble size distribution followed a-5/3 power-law scaling with diameter. Using the relationship between the local dissipation rate and bubble size, the bottom dissipation rate was found to increase along the chute bottom, and the corresponding Hinze scale showed a good agreement with the observations.

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Section: Bottom Turbulent Dissipation Ratementioning

confidence: 99%

Development of Bubble Characteristics on Chute Spillway Bottom

Bai¹,

Liu²,

Feng³

et al. 2018

Water

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“…Many of the fundamental physical processes assumed to take place in cavitating flows are incorporated into the model. These include bubble formation through homogeneous nucleation, momentum exchange between the bubbly and the carrier liquid phase, bubble growth and collapse due to non-linear dynamics according to the early study of [31], bubble turbulent dispersion as proposed by [32] and bubble turbulent/hydrodynamic break-up, based on the experimental observations of [33]. The effect of bubble coalescence and bubble-to-bubble interaction on the momentum exchange and during bubble growth/collapse is also considered.…”

Section: Lagrangian Cavitation Bubbles Sub-modelsmentioning

confidence: 99%

Simulation of Heating Effects Caused by Extreme Fuel Pressurisation in Cavitating Flows through Diesel Fuel Injectors

Gavaises¹,

Theodorakakos

Mitroglou³

2012

Proceedings of the 8th International Symposium on Cavitation

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Pressurization of Diesel fuel in modern common-rail injectors in excess of 2000bar can result to increased temperatures and significant variation of the fuel physical properties (density, viscosity, heat capacity and thermal conductivity) relative to those under atmospheric pressure and room temperature conditions. Moreover, due to the sharp de-pressurization experienced by the fuel at the inlet of the injection holes, significant gradients of the above properties are established. The subsequent fuel acceleration at velocities reaching 700m/s is also inducing further wall friction and thus heating. Consequently, the characteristics of cavitation taking place at the entrance to the injection holes are altered while the volumetric efficiency of the nozzle is significantly affected. The present study quantifies the role of these effects in mini sac-type Diesel injectors operating at pressures up to 2400bar through use of a RANS cavitation CFD model. The flow solver is accordingly modified to account for such effects during the solution of the flow conservation equations. Two different injector designs have been considered, both based on the same mini sac-type nozzle body; one with sharp-inlet cylindrical holes and one with tapered holes with inlet rounding. The results indicate significant changes in terms of the details of the flow development but also to bulk flow characteristics such as the volumetric efficiency of the injectors and the mean fuel injection temperature relative to the isothermal/constant properties case.

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“…Some of the models assume a uniform or a truncated normal distribution which is centered at the half of the bubble/droplet size. In other words these models are based on the assumption of equal-sized breakage [2,26,47]. In contrast, some others presume unequal breakup which means a bubble/droplet breaking into a large and a smaller one [2,31,45].…”

Section: Introductionmentioning

confidence: 99%

“…In other words these models are based on the assumption of equal-sized breakage [2,26,47]. In contrast, some others presume unequal breakup which means a bubble/droplet breaking into a large and a smaller one [2,31,45]. The developed model by [27] is able to combine the features of these significantly different breakage closures.…”

Section: Introductionmentioning

confidence: 99%