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The experimental results confirmed our previous findings: gaseous emboli with a diameter close to the resonance size scatter significantly at higher harmonic components (from the second harmonic up to the fifth), and bubbles with a diameter around twice the resonance size produce a subharmonic and/or an ultraharmonic component.
The DBM, originally developed for the description of gas liquid flows, has been adapted to cope with bubbles with a diameter larger than the size of an Eulerian cell, which is required in view of the large bubble size distribution at higher gas flow rates.
Histograms for such foams show increase in the amount of small bubbles (diagram below 0.1 mm, double-fold) and a decrease in large bubbles with a diameter of 0.3 mm.
Recently, an Australian group published a computational analysis of microbubbles in HD: most bubbles with a diameter of <50 µm, and many bubbles in the range of 50 200 µm pass through the venous bubble catcher [ 14].
Other potential air reservoirs were magnitudes smaller; in rare cases, air bubbles with a diameter of a few millimetres were seen, and in most cases, air bubbles were found only after attentive search due to their extremely small size.
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Inset shows a large bubble with a diameter of approximately 200 nm.
Interfacial areas and gas hold-ups have been determined at pressures up to 8.0 MPa in a mechanically agitated gas liquid reactor and a bubble column with a diameter of 81 mm for superficial gas velocites between 1 and 5 and 1 and 10 cm/s, respectively.
The VOF method has been tested for different types of bubble flows at low Re and for path-oscillating and wobbling air bubbles (in water) with a diameter range of 1.82
The presence of surfactants in untreated tap water appear to effect the transition point, particularly for bubbles with a smaller initial diameter and lower rise velocity.
It consists of large bubble-like structures with a diameter of tens of micrometers.
A number fraction of micro-bubbles (with an equivalent diameter, Deq, equal or bellow 0.2 mm) up to 60% was generated with increasing values of x0 (i.e. 3 mm) and values of f in the range 10 15s−1.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com