Modeling of hydrodynamic cavitation reactors based on orifice plates considering hydrodynamics and chemical reactions occurring in bubble

Sharma, Amit; Gogate, Parag R.; Mahulkar, Amit V.; Pandit, Aniruddha B.

doi:10.1016/j.cej.2008.04.005

Cited by 63 publications

(32 citation statements)

References 32 publications

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“…It should be noted that the cavitational intensity is also dependent on the recovered pressure [30], but in the present case the change in the recovered pressure was only marginal as compared to the change in the inlet pressure and hence the cavitational intensity is dominantly affected by the changes in the inlet pressure. Since there is elevated cavitational collapse intensity at higher inlet pressures, a higher temperature and pressure pulse is generated resulting in enhanced dissociation of the water molecules trapped in the cavity thereby leading to more hydroxyl radicals [31,32].…”

Section: Effect Of the Inlet Pressurementioning

confidence: 99%

Decontamination of unsymmetrical dimethylhydrazine waste water by hydrodynamic cavitation-induced advanced Fenton process

Angaji

Ghiaee

2015

Ultrasonics Sonochemistry

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A pilot scale hydrodynamic cavitation (HC) reactor, using iron metal blades, as the heterogeneous catalyst, with no external source of H₂O₂ was developed for catalytic decontamination of unsymmetrical dimethylhydrazine (UDMH) waste water. In situ generation of Fenton reagents suggested an induced advanced Fenton process (IAFP) to explain the enhancing effect of the used catalyst in the HC process. The effects of the applied catalyst, pH of the initial solution (1.0-9.7), initial UDMH concentration (2-15 mg/l), inlet pressure (5.5-7.8bar), and downstream pressure (2-6 bar), have been investigated. The results showed that the highest cavitation yield can be obtained at pH 3 and initial UDMH concentration of 10mg/l. Also, an increase in the inlet pressure would lead to an increase in the extent of UDMH degradation. In addition, the optimum value of 3 bar was determined for the downstream pressure that resulted to 98.6% degradation of UDMH after 120 min of processing time. Neither n-nitrosodimethylamine (NDMA) nor any other toxic byproduct (/end-product) was observed in the investigated samples. Formic acid and acetic acid, as well as nitromethane, were identified as oxidation by-products. The present work has conclusively established that hydrodynamic cavitation in combination with Fenton's chemistry can be effectively used for the degradation of UDMH.

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Section: Effect Of the Inlet Pressurementioning

confidence: 99%

Decontamination of unsymmetrical dimethylhydrazine waste water by hydrodynamic cavitation-induced advanced Fenton process

Angaji

Ghiaee

2015

Ultrasonics Sonochemistry

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“…Considerable researches including numerical simulation [18,19] and experiment [10,20] have concluded that hydrodynamic cavitation generates the cavitate conditions similar to that of acoustic cavitation and is an advanced oxidation process [21]. Moreover, there are several advantages on hydrodynamic cavitation: large handling capacity, low energy consumption, easy design of reactor, etc.…”

Section: Introductionmentioning

confidence: 95%

Effects of operating parameters and additives on degradation of phenol in water by the combination of H2O2 and hydrodynamic cavitation

Zhang

et al. 2015

Desalination and Water Treatment

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A B S T R A C TThe combination of H 2 O 2 and hydrodynamic cavitation has been used to degrade phenol in water. The effects of parameters including inlet pressure (P1), orifice geometries of hydrodynamic reactor, initial concentration of H 2 O 2 , the presence of dissolved gases and catalysts (CuO, Fe, and TiO 2 ) have been discussed. It revealed that increased P1, more number of holes on plates, optimum initial H 2 O 2 concentration, the higher flow rate of oxygen, and the presence of Fe or CuO are more favorable in phenol degradation. Nitrogen has different effect on cavitation from oxygen. Furthermore, the identification of primary intermediates of the reaction (hydroquinone, catechol, benzoquinone, and resorcin) indicated that hydroxyl radicals are involved in phenol degradation mechanisms.

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“…Gogate and Pandit 16 and Gogate et al 17 have reported simulations of hydrodynamic cavitation reactors using a combination of models of Rayleigh-Plesset (for bubble wall Mach no. Sharma et al 20 have modeled the reactiondiffusion kinetics of a cavitation bubble in flow downstream of an orifice. [ 1), and also have validated their results using Weissler reaction as the yardstick for cavitation yield and efficiency.…”

Section: Introductionmentioning

confidence: 99%

Flow regime maps and optimization thereby of hydrodynamic cavitation reactors

2012

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Hydrodynamic cavitation reactors are known to intensify diverse physical and chemical processes. In this article, flow regime maps have been proposed that give an overview of the operation of hydrodynamic cavitation reactor for different combinations of design and process parameters. These maps are based on simulations of cavitating flow using mathematical model that couples continuum mixture model with diffusion limited model. Specific flow regimes have been identified depending on the energetics of the collapse of cavitation bubble as sonophysical, sonochemical, and stable oscillatory (no physical or chemical effect). The radial motion of the bubble in the cavitating flow is governed by the mean and turbulent pressure gradients, which in turn, are decided by the design parameters. An analysis of variations in the pressure gradients in the cavitating flow with design parameters has been given. The flow regime maps form a useful tool for identification of most optimum set of design parameters for hydrodynamic cavitation reactor for a physical or chemical process. © 2012 American Institute of Chemical Engineers AIChE J, 58: 3858–3866, 2012

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Modeling of hydrodynamic cavitation reactors based on orifice plates considering hydrodynamics and chemical reactions occurring in bubble

Cited by 63 publications

References 32 publications

Decontamination of unsymmetrical dimethylhydrazine waste water by hydrodynamic cavitation-induced advanced Fenton process

Decontamination of unsymmetrical dimethylhydrazine waste water by hydrodynamic cavitation-induced advanced Fenton process

Effects of operating parameters and additives on degradation of phenol in water by the combination of H2O2 and hydrodynamic cavitation

Flow regime maps and optimization thereby of hydrodynamic cavitation reactors

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