Evaporation dynamics of microbubbles

Zimmerman, William B.; Al-Mashhadani, Mahmood K. H.; Bandulasena, Hemaka C.H.

doi:10.1016/j.ces.2013.05.026

Cited by 54 publications

(66 citation statements)

References 29 publications

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“…However, the liquid temperature profile showed that the liquid temperature increased as the liquid mixture concentration decreased. The average liquid temperature at a liquid concentration of 10% was around 38.5 ∘ C, and the average liquid temperature at a liquid concentration of 60% was around 37 ∘ C. The mechanism of microbubble distillation is proposed by a computational model developed by [8]. Later on the concept was tested with a binary system of ethanol and water [10].…”

Section: Resultsmentioning

confidence: 99%

“…The lower liquid levels showed a higher vapour composition than that achieved with higher liquid level under the same experimental conditions [8,10]. Accordingly, this set of experiments was conducted at a liquid level of 3.5 mm to study the vapourliquid composition obtained from microbubble distillation.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, the evaporation dynamics of hot microbubbles in air-water systems have been studied [8]. The computational model presents the concept of nonequilibrium evaporation by heating the gas phase rather than the liquid phase.…”

Section: Introductionmentioning

confidence: 99%

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Microbubble Distillation for Ethanol-Water Separation

Al-Yaqoobi

Hogg²,

Zimmerman

2016

International Journal of Chemical Engineering

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In the current study, a novel approach for separating ethanol-water mixture by microbubble distillation technology was investigated. Traditional distillation processes require large amounts of energy to raise the liquid to its boiling point to effect removal of volatile components. The concept of microbubble distillation by comparison is to heat the gas phase rather than the liquid phase to achieve separation. The removal of ethanol from the thermally sensitive fermentation broths was taken as a case of study. Consequently the results were then compared with those which could be obtained under equilibrium conditions expected in an "ideal" distillation unit. Microbubble distillation has achieved vapour compositions higher than that which could be obtained under traditional equilibrium conditions. The separation was achieved at liquid temperature significantly less than the boiling point of the mixture. In addition, it was observed that the separation efficiency of the microbubble distillation could be increased by raising the injected air temperature, while the temperature of the liquid mixture increased only moderately. The separation efficiency of microbubble distillation was compared with that of pervaporation for the recovery of bioethanol from the thermally sensitive fermentation broths. The technology could be controlled to give high separation and energy efficiency. This could contribute to improving commercial viability of biofuel production and other coproducts of biorefinery processing.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Microbubble Distillation for Ethanol-Water Separation

Al-Yaqoobi

Hogg²,

Zimmerman

2016

International Journal of Chemical Engineering

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“…The outlet stream was connected to a glass condenser which was cooled by ice/salt coolant to maintain the condenser between -19 to -20 o C. Before the liquid was poured into the tank, the system was heated for approximately 60 minutes. Following the completion of each experiment the residual liquid was collected and final volume was measured to calculate the evaporation ratio (EV %) as in (1). All the samples were analysed by Bruker's ALPHA FTIR-ATR spectrometer.…”

Section: Experimental Apparatus and Materialsmentioning

confidence: 99%

“…Recently, a computational model has been developed to study the evaporation dynamic of microbubbles in air-water systems. This hypothesis is achieved by taking into consideration the internal gas dynamics of the bubble [1]. The study questions the concept of heating the gas phase rather than the liquid phase to achieve the maximum equilibrium vapour pressure as in traditional distillation.…”

Section: Introductionmentioning

confidence: 99%

Microbubble Distillation Studies of a Binary Mixture

Al-Yaqoobi¹,

Zimmerman²

2015

USES Conference Proceedings

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The characteristics of microbubble distillation of binary system of ethanol and water have been investigated. The study describes the use of a fluidic oscillator used to generate microbubbles. The effects of air temperature and liquid level on separation performance have been studied. The results demonstrate that ethanol concentration in the distilled phase decreases with increasing liquid level. Increasing air temperature enhances the separation efficiency of the two components. It is shown that the ethanol fraction in distilled phase and the evaporation ratio increases by increasing the air temperature. Furthermore, the concentration of ethanol in the residual liquid shows a corresponding decrease. The vapour-liquid composition of microbubble distillation can exceed the isothermal equilibrium vapour-liquid composition by controlling the liquid level and the air temperature within the process.

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Separation of azeotropic mixtures using air microbubbles generated by fluidic oscillation

et al. 2015

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The feasibility of separating the azeotropic mixture of ethanol-water using microbubble-mediated batch distillation is presented. The effects of the depth of the liquid mixture in the bubble tank and of the inlet air microbubble temperature on the process efficiency were investigated. The enrichment of ethanol in the vapor phase was higher than that achieved at equilibrium conditions for all liquid ethanol mole fractions considered, including the azeotrope. On decreasing the depth of the liquid mixture and increasing the temperature of the air microbubbles, the separation efficiency of ethanol was improved. Ethanol with purity of about 98.2 vol % was obtained using the lowest liquid level (3 mm) in conjunction with the highest air microbubble temperature (908C). Separation was achieved with a small rise in the temperature of the liquid mixture (48C) at a depth of 3 mm and evaporation time of 90 min making this system suitable for treating thermally sensitive mixtures.

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Evaporation dynamics of microbubbles

Cited by 54 publications

References 29 publications

Microbubble Distillation for Ethanol-Water Separation

Microbubble Distillation for Ethanol-Water Separation

Microbubble Distillation Studies of a Binary Mixture

Separation of azeotropic mixtures using air microbubbles generated by fluidic oscillation

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