Low pressure hydrodynamic cavitating device for producing highly stable oil in water emulsion: Effect of geometry and cavitation number

Carpenter, Jitendra; George, Suja; Saharan, Virendra Kumar

doi:10.1016/j.cep.2017.02.013

Cited by 76 publications

(113 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The DSD is slightly narrower for large values of β , and d 32 slightly decreased with increasing β . Similar results were obtained in an emulsion production system by Carpenter et al These results can be explained based on the work of Moholkar and Pandit; that is, the distinct effect of increased β on bubble motion (produced by the cavitational events) is that the maximum size reached during oscillation and the intensity of bubble collapse both increase. However, the frequency of the turbulent velocity is significantly reduced.…”

Section: Resultssupporting

confidence: 82%

See 1 more Smart Citation

Modeling of an industrial scale hydrodynamic cavitation multiphase reactor for Prileschajew epoxidation

Cai

Liu

et al. 2020

AIChE Journal

View full text Add to dashboard Cite

The hydrodynamic cavitation multiphase reactor (HCMR) is emerging as a promising alternative for the intensification of liquid–liquid heterogeneous reactions, but research on HCMR modeling is lacking. In this article, an HCMR model was developed using Prileschajew epoxidation as the model system. First, based on experimental measurements of oil/water two‐phase flow downstream of hydrodynamic cavitation devices, semiempirical correlations were proposed to describe the droplet size and droplet size distribution (DSD) as functions of flow conditions and geometry parameters. Then, with boundary conditions calculated by the DSD correlation, a droplet dynamics simulation in a reaction tank was performed by computational fluid dynamics coupled with population balance model to obtain the two‐phase interfacial area. Finally, the acquired reactor model was substituted into an overall kinetic model, to simulate the epoxidation reaction in HCMR. Model predictions were verified by experimental results measured on an industrial scale HCMR.

show abstract

Section: Resultssupporting

confidence: 82%

Section: Kinetic Modeling Of Fames Epoxidation In An Hcmrsupporting

confidence: 87%

Modeling of an industrial scale hydrodynamic cavitation multiphase reactor for Prileschajew epoxidation

Cai

Liu

et al. 2020

AIChE Journal

View full text Add to dashboard Cite

show abstract

“…Indeed, the residual retention of d-limonene in the aqueous solution, up to sample T27 (30 min, 35 • C) in the WOP2 test (Figure 9a), could have been favored by two factors. First, the likely micronization and partial emulsification of the terpenes in water, based on the well-established effectivity of HC processes in the creation of stable sub-micron oil-in-water emulsions [41,72]. Second, the effectivity of pectin as an emulsifying compound, as well as a stabilizer for emulsions [15].…”

Section: Discussionmentioning

confidence: 99%

“…Venturi-shaped cavitation reactors were shown to outperform other reactors based on fixed constrictions, such as orifice plates, in the treatment of viscous food liquids [33]. This superiority especially holds with liquids containing solid particles, as well as for the inactivation of spoilage microorganisms [40], and the creation of oil-in-water stable nanoemulsions [41], all these features being relevant to the processes under study. In case of a fixed mechanical constriction, such as the Venturi-shaped HC reactor shown in Figure 1, the liquid velocity and static pressure are regulated by Bernoulli's equation [20], i.e., the conservation of the mechanical energy for a moving fluid is represented by Equation 1:…”

Section: Hc Device and Processesmentioning

confidence: 99%

Real-Scale Integral Valorization of Waste Orange Peel via Hydrodynamic Cavitation

Meneguzzo

Brunetti

Fidalgo³

et al. 2019

Processes

View full text Add to dashboard Cite

Waste orange peel represents a heavy burden for the orange juice industry, estimated in several million tons per year worldwide; nevertheless, this by-product is endowed with valuable bioactive compounds, such as pectin, polyphenols, and terpenes. The potential value of the waste orange peel has stimulated the search for extraction processes, alternative or complementary to landfilling or to the integral energy conversion. This study introduces controlled hydrodynamic cavitation as a new route to the integral valorization of this by-product, based on simple equipment, speed, effectiveness and efficiency, scalability, and compliance with green extraction principles. Waste orange peel, in batches of several kg, was processed in more than 100 L of water, without any other raw materials, in a device comprising a Venturi-shaped cavitation reactor. The extractions of pectin (with a remarkably low degree of esterification), polyphenols (flavanones and hydroxycinnamic acid derivatives), and terpenes (mainly d-limonene) were effective and efficient (high yields within a few min of process time). The biomethane generation potential of the process residues was determined. The achieved results proved the viability of the proposed route to the integral valorization of waste orange peel, though wide margins exist for further improvements.

show abstract

“…For wastewater applications in particular, HC has been identified as a promising method for the removal of micropollutants (Ranade and Bhandari), and numerous recent studies have highlighted its potential to degrade a range of contaminants recalcitrant to conventional treatment methods . Besides wastewater applications, the successful application of HC technology has been reported in a wide range of industrial processes, including biodiesel synthesis, biomass pretreatment, and in food and beverage production to name just a few. Reactor designs are typically of orifice or venturi type construction, and while the influence of reactor geometry has been reported to dictate overall performance to a significant extent (see e.g., Refs.…”

Section: Introductionmentioning

confidence: 99%

Modeling hydrodynamic cavitation in venturi: influence of venturi configuration on inception and extent of cavitation

Simpson

Ranade

2018

AIChE Journal

View full text Add to dashboard Cite

in Wiley Online Library (wileyonlinelibrary.com)Hydrodynamic cavitation (HC) is useful for intensifying a wide variety of industrial applications including biofuel production, emulsion preparation, and wastewater treatment. Venturi is one of the most widely used devices for HC. Despite the wide spread use, the role and interactions among various design and operating parameters on generated cavitation is not yet adequately understood. This article presents results of computational investigation into the cavitation characteristics of different venturi designs over a range of operating conditions. Influence of the key geometric parameters such as the length of venturi throat and diffuser angle on the inception and extent of cavitation is discussed quantitatively. Formulation and solution of multiphase computational fluid dynamics (CFD) models are presented. Appropriate turbulence and cavitation models are selected and solved using a commercial CFD code. Care was taken to eliminate the influence of numerical parameters like mesh density, discretization scheme, and convergence criteria. The computational model was validated by comparing simulated results with three published data sets. The simulated results in terms of velocity and pressure gradients, vapor volume fractions and turbulence quantities, and so on, are critically analyzed and discussed. Diffuser angle was found to have a significant influence on cavitation inception and evolution. The length of the venturi throat has relatively less impact on cavitation inception and evolution compared to the diffuser angle. The models and simulated flow field were used to simulate detailed time-pressure histories for individual vapor cavities, including turbulent fluctuations. This in turn can be used to simulate cavity collapse and overall performance of HC device as a reactor. The presented results offer useful guidance to the designer of HC devices, identifying key operating and design parameters that can be manipulated to achieve the desired level of cavitational activity. The presented approach and results also offer a useful means to compare and to evaluate different designs of cavitation devices and operating parameters.

show abstract

Low pressure hydrodynamic cavitating device for producing highly stable oil in water emulsion: Effect of geometry and cavitation number

Cited by 76 publications

References 32 publications

Modeling of an industrial scale hydrodynamic cavitation multiphase reactor for Prileschajew epoxidation

Modeling of an industrial scale hydrodynamic cavitation multiphase reactor for Prileschajew epoxidation

Real-Scale Integral Valorization of Waste Orange Peel via Hydrodynamic Cavitation

Modeling hydrodynamic cavitation in venturi: influence of venturi configuration on inception and extent of cavitation

Contact Info

Product

Resources

About