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Bubble formation in dense fluidized beds
Physics of Fluids A: Fluid Dynamics, 1991It has been known for a long time that fluidized beds of solid powder in gas may become unstable for certain values of relative and mass fraction, and that this behavior is important in determining the mixing properties of the bed. Several different mechanisms have been proposed for this instability, but no broad consensus is available on which are the
Juan A. Hernández, Javier Jiménez
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Theory of the Formation of Bubbles
Journal of Applied Physics, 1953We have not yet obtained a perfect theory of bubble formation. In this paper the perfect theory of the formation of bubbles in the case where the bubbles of vapor are nucleated spontaneously in pure liquid is presented. This is done by the systematization of the classical theory of M.
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2021
In the previous chapter, we learned that, for bubble generation, a supersaturated state is required. So, how do bubbles actually form in a supersaturated liquid? How do these bubbles grow to bubbles that we can see? To answer these questions and understand bubble formation, it is absolutely necessary for us to consider the meaning of the size and ...
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In the previous chapter, we learned that, for bubble generation, a supersaturated state is required. So, how do bubbles actually form in a supersaturated liquid? How do these bubbles grow to bubbles that we can see? To answer these questions and understand bubble formation, it is absolutely necessary for us to consider the meaning of the size and ...
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The Formation of Bubbles and Drops
1970Publisher Summary This chapter describes the single bubble formation at isolated nozzles both under constant flow and constant pressure conditions, though considerable work still needs to be done in the intermediate region where bubble size is highly influenced by resonance effects.
R. Kumar, N.K. Kuloor
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Studies in bubble formation—I bubble formation under constant flow conditions
Chemical Engineering Science, 1969A model based on two step mechanism of bubble formation is proposed. The resulting equations are used to explain the discrepancies existing in the literature. Data have been collected over a wide range of variables to test the model.
Ramakrishnan, S, Kumar, R, Kuloor, NR
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DNA Bubble Formation in Transcription Initiation
Biochemistry, 2008The properties of the DNA bubble in the transcription open complex have been characterized by topological analysis of DNA circles containing the lac UV5 promoter or the PR promoter from bacteriophage lambda. Topological analysis is particularly well suited to this purpose since it quantifies the changes in DNA duplex geometry caused by bubble formation
Vladimir, Tchernaenko +3 more
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Bubble Formation at a Gas-Evolving Microelectrode
Langmuir, 2014The electrolytic production of gas bubbles involves three steps--nucleation, growth, and detachment. Here the growth of hydrogen bubbles and their detachment from a platinum microelectrode of diameter 125 μm are studied using high-speed photography and overpotential frequency spectrum (noise) analysis. The periodic release of large
Damaris, Fernández +4 more
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The mechanics of bubble formation
Journal of Applied Chemistry, 1955AbstractThe size of gas bubble produced from an open‐ended tube immersed in a liquid can be derived by equating surface tension and buoyancy forces. The equations do not apply, however, when the gas flow is large as in many industrial fermentations, and porous elements are therefore often used to provide many orifices and a low gas‐flow through each ...
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Studies in bubble formation—II bubble formation under constant pressure conditions
Chemical Engineering Science, 1969Bubble formation under constant pressure conditions has been investigated for wide range of variation of liquid properties.Air bubbles were formed from single horizontal orifices submerged in liquids whose viscosity varied from 1·0 to 600 cPs and surface tension from 37 to 72 dyn/cm.
Satyanarayan, A, Kumar, R, Kuloor, NR
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Bubble and ring formation in nuclear fragmentation
Physical Review Letters, 1992Nuclear transport theory predicts the formation of unstable bubbles and rings in the central collision between equal-mass heavy ions. This phenomenon occurs around a beam energy of E/A\ensuremath{\approxeq}50 MeV/nucleon and is due to the compression of the nuclei in the early stage of the collision.
, Bauer, , Bertsch, , Schulz
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