Influence of the geometrical and gasdynamic parameters of a mixer on the mixing of radial jets colliding with a crossflow

Ktalkherman, M. G.; Emel’kin, V. A.; Pozdnyakov, B. A.

doi:10.1007/s10891-010-0375-6

Cited by 14 publications

(7 citation statements)

References 2 publications

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“…Several works about jets in counterflow and crossflow have converged into a similar empirical mathematical expression for describing h (eq ). , K is a dimensionless empirical constant that depends on the mixing length and shear layer of the gases, Z is the ratio that relates the initial momentum of the jet with the momentum of the opposing or retarding flow, and D is the inner diameter of the confinement tubing. We suggest that Z is best represented by the ratio of the jet-to-backward momentum flows , ( J n / J p ) (eq ).…”

Section: Resultsmentioning

confidence: 99%

Characterization of the Axial Jet Separator with a CO₂/Helium Mixture: Toward GC-AMS Hyphenation

et al. 2016

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Development of interfaces for sample introduction from high pressures is important for real-time online hyphenation of chromatographic and other separation devices with mass spectrometry (MS) or accelerator mass spectrometry (AMS). Momentum separators can reduce unwanted low-density gases and introduce the analyte into the vacuum. In this work, the axial jet separator, a new momentum interface, is characterized by theory and empirical optimization. The mathematical model describes the different axial penetration of the components of a jet-gas mixture and explains the empirical results for injections of CO2 in helium into MS and AMS instruments. We show that the performance of the new interface is sensitive to the nozzle size, showing good qualitative agreement with the mathematical model. Smaller nozzle sizes are more preferable due to their higher inflow capacity. The CO2 transmission efficiency of the interface into a MS instrument is ∼ 14% (CO2/helium separation factor of 2.7). The interface receives and delivers flows of ∼ 17.5 mL/min and ∼ 0.9 mL/min, respectively. For the interfaced AMS instrument, the ionization and overall efficiencies are 0.7-3% and 0.1-0.4%, respectively, for CO2 amounts of 4-0.6 μg C, which is only slightly lower compared to conventional systems using intermediate trapping. The ionization efficiency depends on to the carbon mass flow in the injected pulse and is suppressed at high CO2 flows. Relative to a conventional jet separator, the transmission efficiency of the axial jet separator is lower, but its performance is less sensitive to misalignments.

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Section: Resultsmentioning

confidence: 99%

Characterization of the Axial Jet Separator with a CO₂/Helium Mixture: Toward GC-AMS Hyphenation

et al. 2016

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“…A kinetic model [16] included 689 reactions involving 155 species was used for the modeling of the LPG pyrolysis. This model involved hydrocarbon molecules and radicals with carbon atoms number up to 5…”

Section: Modelingmentioning

confidence: 99%

“…The kinetic model was combined from three parts. The model of butane pyrolysis [16] approved before [17] was used as a base. Additive reactions included saturated and unsaturated hydrocarbons with carbon atoms quantity up to 11 [18] and cyclic hydrocarbons -cyclohexane, methylcyclohexane [19], etc.…”

Section: Modelingmentioning

confidence: 99%

Simulation of hydrocarbons pyrolysis in a fast-mixing reactor

Ktalkherman

Namyatov

2015

Chinese Journal of Chemical Engineering

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“…For this purpose, we used the following formula for calculating the penetration depth h/D of gas jets with density ρ j and flow rate G j , which were radially injected through n orifices of diameter d into the reactor channel of diameter D in a gas flow with density ρ m and flow rate G m [24]:…”

Section: Effectiveness Of Gas Mixing In the Zone Of Ticl 4 Injection mentioning

confidence: 99%

An Experimental Study of the Synthesis of Ultrafine Titania Powder in Plasmachemical Flow-Type Reactor

Kartaev

Lukashov

Vashenko

et al. 2014

International Journal of Chemical Reactor Engineering

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Methods for controlling the synthesis of the submicron (including nanosized) powder of titanium dioxide (titania, TiO 2 ) in a setup with a plasmachemical flow reactor were investigated. The synthesis of titania particles from gaseous titanium tetrachloride (TiCl 4 ) in the plasmachemical reactor by the chloride method was experimentally studied. The processes of formation and growth of particles depending on the type of the plasmaforming gas, flow rates of TiCl 4 ; and the quenching gas (air), reactor length, and mean-mass temperature in the reaction zone were considered. When using nitrogen as heat-carrying gas, a new approach of titania powder synthesis based on combining of reaction zone and quenching zone has been applied. Under these nonequilibrium conditions and substantial temperature gradients, this method enabled us to synthesize reproducibly ultrafine titania powders (30-50 nm) with a high content (80-87%) of metastable anatase crystal lattice. The results reveal that the powder properties can be efficiently controlled, i.e., one setup can produce titania with a required particle size and a type of the crystal lattice: anatase (A) or rutile (R). The experimental data are found to agree well with the results of numerical calculations.

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Influence of the geometrical and gasdynamic parameters of a mixer on the mixing of radial jets colliding with a crossflow

Cited by 14 publications

References 2 publications

Characterization of the Axial Jet Separator with a CO₂/Helium Mixture: Toward GC-AMS Hyphenation

Characterization of the Axial Jet Separator with a CO₂/Helium Mixture: Toward GC-AMS Hyphenation

Simulation of hydrocarbons pyrolysis in a fast-mixing reactor

An Experimental Study of the Synthesis of Ultrafine Titania Powder in Plasmachemical Flow-Type Reactor

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Influence of the geometrical and gasdynamic parameters of a mixer on the mixing of radial jets colliding with a crossflow

Cited by 14 publications

References 2 publications

Characterization of the Axial Jet Separator with a CO2/Helium Mixture: Toward GC-AMS Hyphenation

Characterization of the Axial Jet Separator with a CO2/Helium Mixture: Toward GC-AMS Hyphenation

Simulation of hydrocarbons pyrolysis in a fast-mixing reactor

An Experimental Study of the Synthesis of Ultrafine Titania Powder in Plasmachemical Flow-Type Reactor

Contact Info

Product

Resources

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Characterization of the Axial Jet Separator with a CO₂/Helium Mixture: Toward GC-AMS Hyphenation

Characterization of the Axial Jet Separator with a CO₂/Helium Mixture: Toward GC-AMS Hyphenation