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The bubbly hydrodynamic characteristics and bubble size are influenced by several dependent parameters, including mechanical energy input [26], gas mass flow [27], circulating pressure [28], [29], circulating liquid mass flow [30], and solution physical properties [31], [32], etc. Darabi et al. [33] discussed the effect of gas mass flow on ...
A new experimental protocol for flow field effects on dynamic adsorption layer. • Significant effects on a fresh air bubble in surfactants solution is observed. • Negligible effects of the flow field on the surfactant distribution for pre-aged bubbles. • It can be used for better understanding of rising bubbles in surfactant solutions.
An algorithm is proposed quantitatively to take into consideration the depletion effect which is required for a correct description of the co-adsorption of alkanes on the solution drop surface and the correct analysis of experimental dynamic surface tension data to determine the adsorption mechanism. Bubble and drop profile analysis tensiometry ...
A detailed analysis of the dynamic adsorption of crude oil components dissolved in produced water onto air bubble surfaces is presented. Nine different crude oils were used to prepare synthetic produced water samples. ... Effect of the bubble size on the dynamic adsorption of frothers and collectors in flotation. International Journal of ...
bubble, and the agglomeration of fine cassiterite particles in electro‐flotation. Additionally, it was greatly inspired to explore bubble–particle attachment in dissolved air flotation from ...
Modification of ilmenite surface chemistry for enhancing surfactants adsorption and bubble attachment. ... Surfactants are widely used to control the interfacial properties of the …
Using Direct Numerical Simulations (DNS), it was revealed that surfactant redistribution can occur at the bubble surface as a result of the bouncing dynamics (approach …
The temperature effect on dynamic adsorption behavior of VOCs is worth studying for adsorbent preparation and fixed-bed design, which are the core role during the adsorption process. ... One of the two nitrogen flows passed through the bubble saturator containing liquid VOCs, which was put in a thermostatic water bath to control the temperature ...
The bubble size is influenced by multiple aspects, such as the initial bubble size, the extent of bubble coalescence and the dripping-jetting transition. As a result, the bubble size shows a non-monotonous behaviour as function of the SDS concentration, leading to polydispersity. ... Effects of dynamic adsorption on bubble formation and ...
Semantic Scholar extracted view of "Dynamic adsorption of water soluble crude oil components at air bubbles" by M. Eftekhardadkhah et al. ... Effect of the bubble size on the dynamic adsorption of frothers and collectors in flotation. Anh V. Nguyen C. Phan G. Evans. Engineering, Chemistry. 2006; 34.
This paper presents an analysis on the dynamic adsorption of frothers and collectors onto air bubbles in flotation. The analysis was carried out using the theory on the surfactant transfer by diffusion and adsorption. The bubble size was considered when solving the diffusion equation for the dynamic surface excess. The adsorption kinetics was modelled employing the Langmuir …
The results show that, for air bubbles with diameter of the order of 1 mm, the bubble size effect on the dynamic surface tension is small and the solution of the diffusion equation …
A minimum time of 0.4 ms is needed to immediately stabilize individual bubbles. Our study provides a promising microfluidic tool to study bubble formation and coalescence …
Flotation kinetics and the particle-bubble collision frequency strongly depends on bubble size and bubble size distribution (BSD). Bubble size and BSD are most affected by …
Dynamic adsorption effects can play a crucial role in bubble formation and stabilization. We hypothesize that microfluidic tools provide direct insights to these effects, and …
Dynamic surface tension and adsorption mechanisms of surfactants at the air-water interface. Adv. Colloid Interface, 85 (2000), ... The effect of drop (bubble) size on advancing and receding contact angles for heterogeneous and rough solid surfaces as observed with sessile-drop and captive-bubble techniques.
In both regimes, the initial bubble size d0 mainly increases with the viscosity (η1/3). ... regime by incorporating the effects of dynamic adsorption on bub-ble formation and stabilization. It is ...
A modified Rayleigh-Plesset equation was derived to describe the radial bubble motion, including the effects of gas diffusion and adsorption/desorption of a surfactant coating, and coupled to an equation describing microbubble translation, which indicated high sensitivity to species altering the dynamic surface tension and proximity to a boundary.
The effects of both bulk viscosity and surfactant concentration on bubble size are illustrated in Fig. 7 a and b. The model systems studied thus highlighted the well-known effect of bulk viscosity on bubble size [20], [22], [29]. The representation of the Sauter diameter on bulk viscosity illustrates the same trend.
It was found that degrees of initial bubble adsorption coverage (which values were calculated according to existing adsorption models), has profound influence on kinetics of the dynamic adsorption ...
The ratio between the major and minor axes of the bubble is known as the aspect ratio. Most of the research is conducted on a single rising bubble [19], [20], [21] and dense bubble two-phase [13] system. In recent years, some experiments have also been performed to study the aspect ratio of bubbles rising in a line [22], in bubbly or dense flow in the two-phase batch …
This document presents an analysis of the dynamic adsorption of frothers and collectors onto air bubbles in flotation. It models the adsorption process using diffusion equations and adsorption isotherms. Experimental data on the …
TOC and dynamic surface tension measurements were used in a modified version of the Ward–Tordai model to evaluate the adsorption mechanisms of the dissolved organic hydrocarbons onto the surface of air bubble. Initially the adsorption process was purely diffusion controlled, while an adsorption barrier occurred after various times (300–1000 ...
The bubble size (empty squares in Figure 2 c) ... Effects of dynamic adsorption on bubble formation and coalescence in partitioned-EDGE devices. J Colloid Interface Sci, 602 (2021), pp. 316-324. View PDF View article View in Scopus Google Scholar. 24. B. Deng, K. Schroen, J. de Ruiter.
The slurry phase, phase, and slurry– phase interfaces are the typical locations for bubble-particle detachment, and significant advancements have been achieved in the detachment theory of the slurry phase and phase. However, the microscopic detachment mechanism of particles at the slurry– phase interface is still unclear. Specifically, there is …
The results show that for air bubbles with diameter of the order of 1 mm, the bubble size effect on the dynamic surface tension is small and the solution of the diffusion equation for a planar gas-liquid surface can be used to describe the dynamic adsorption onto the air bubbles.
However, the adsorption of nanoparticles in dynamic bubbly systems has rarely been studied. The lack of mechanistic understanding has severely hindered the model development. ... Bubble size and entrance length effects on void development in a vertical channel. Int. J. Multiph. Flow, 19 (1993), pp. 99-113. View PDF View article View in Scopus ...
They compared their experimental interfacial tension data for small bubbles in Dowfroth 250 solutions with the calculations based on the transfer of frother by adsorption and diffusion and concluded that the bubble size has negligible effect on the adsorption dynamic for bubbles of diameter of the order of 1 mm, i.e., a size range typically ...
they stabilize and decrease the bubble size and create an optimal stability of the froth phase; change the surface tension of the air-liquid interface; prevent coalescence above the critical coalescence concentration and effect the motion of the bubbles in the pulp. The bubble motion is one of the key parameters in understanding À otation.
PDF | On Mar 1, 2023, Boxin Deng and others published A microfluidic study of bubble formation and coalescence tuned by dynamic adsorption of SDS and proteins | Find, read and cite all the ...
