Journal ArticleDOI
Gas‐Liquid Direct‐Contact Evaporation: A Review
TLDR
In this paper, a review of the literature regarding gas-liquid direct contact evaporators is presented, addressing classic and potential applications, bubble regimes, gas holdup and bubble size distributions, as well as mathematical models proposed for simulating the unit.Abstract:
Gas-liquid direct-contact evaporators are characterized by the bubbling of a superheated gas through the solution to be concentrated. In other words, they are nonisothermal bubble columns. Despite their simplicity of construction, these units exhibit rather complex hydrodynamics and, similar to what occurs to isothermal bubble columns, the design of such units still poses a problem. The present paper reviews the literature regarding this kind of equipment, addressing both experimental studies and modeling efforts. The covered issues include classic and potential applications, bubbling regimes, gas holdup and bubble size distributions, as well as mathematical models proposed for simulating the unit. Additionally, pertinent literature on isothermal bubble columns is also discussed. Recommendations are made for future research.read more
Citations
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Journal ArticleDOI
Modelling of hydrate formation kinetics: State-of-the-art and future directions
TL;DR: A critical review of the literature on hydrate kinetics is provided in this article, with special emphasis upon modeling efforts, essential to the design of any reactor, and the main features of the models available in the literature for hydrate nucleation and growth are discussed, together with their limitations.
Journal ArticleDOI
Effect of surfactant on homogeneous regime stability in bubble column
TL;DR: In this paper, the effect of surface active agents on homogeneous-heterogeneous flow regime transition in a laboratory scale bubble column was investigated and the critical point where the homogeneous regime loses stability and the transition begins was evaluated by several methods.
Journal ArticleDOI
The influence of electrolytes on gas hold-up and regime transition in bubble columns
Cláudio P. Ribeiro,Dieter Mewes +1 more
TL;DR: In this article, the effect of electrolytes on gas hold-up and on the regime transition point in bubble columns was investigated in a 0.12m-in-diameter bubble column, where air was used as the dispersed phase and aqueous solutions of three different salts (NaCl, Na 2 SO 4 and NaI), as well as double-distilled water, were utilised as the continuous phase.
Journal ArticleDOI
Global and local hydrodynamics of bubble columns – Effect of gas distributor
TL;DR: In this paper, a cylindrical laboratory bubble column (2 m tall, 0.127 m dia) was used to measure the gas holdups and bubble sizes at one cross-sectional horizontal plane (1 m above distributor).
Journal ArticleDOI
Bubble columns with fine pore sparger operating in the pseudo-homogeneous regime: Gas hold up prediction and a criterion for the transition to the heterogeneous regime
TL;DR: In this article, the effect of liquid properties and sparger characteristic (i.e., pore size, dimensions) on gas holdup at the pseudo-homogeneous regime was studied and a correlation regarding the prediction of the transition point from the pseudohomogeneous to the heterogeneous regime has been proposed and found to be in good agreement with available data.
References
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Journal Article
Bubbles, Drops, and Particles
TL;DR: In this paper, the authors evaluated the applicability of the standard κ-ϵ equations and other turbulence models with respect to their applicability in swirling, recirculating flows.
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Principles of combustion
TL;DR: In this article, Rankine and Hughes-Hugoniot relations of Detonation and Deflagration Waves of Premixed Gases and Turbulent Reacting Flows with Premixed Reactants.
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Design parameters estimations for bubble column reactors
TL;DR: In this article, the present state-of-the-art for the estimation of nonadjustable parameters in bubble column reactors is evaluated and a discussion is followed by relevant recommendations for their predictions.
Journal ArticleDOI
Bubble coalescence and break‐up in air‐sparged bubble columns
TL;DR: In this article, a Phenomenological model for the rates of bubble coalescence and bubble break-up in turbulent gas-liquid dispersions is proposed, based on the mixing of tracer gases within bubbles upon coalescence, in conjunction with Monte-Carlo simulations of coalescence events.
Journal ArticleDOI
Theoretical model for drop and bubble breakup in turbulent dispersions
Hean Luo,Hallvard F. Svendsen +1 more
TL;DR: In this article, a theoretical model for the prediction of drop and bubble (fluid-particle) breakup rates in turbulent dispersions was developed, based on the theories of isotropic turbulence and probability and contains no unknown or adjustable parameters.