Studies of vortex characteristics and gas-dynamic fields in Ar-H2 inductively coupled plasma

Miao, Linlin; Grishin, Yu. M.

doi:10.1016/j.ijheatmasstransfer.2019.118671

Cited by 7 publications

(8 citation statements)

References 32 publications

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“…As can be seen from figure 2 that with the addition of hydrogen (10 slpm H 2 ) into the RF-ICP torch system of argon plasma, the plasma temperature around axis at the same crosssections significantly decreases (in 1000-2000 K) as a result of the higher specific enthalpy of hydrogen [43]. In the argon plasma the numerical results about the radial temperature profiles at those two different cross-sections are well in agreement with the experiments.…”

Section: Resultssupporting

confidence: 74%

Dynamic heating and thermal destruction conditions of quartz particles in polydisperse plasma flow of RF-ICP torch system

Miao¹,

Grishin²

2020

Plasma Sci. Technol.

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Numerical simulation of turbulent mixing process of polydisperse quartz particle (particle size distribution in the range of 0.1-0.4 mm) flow with Ar and Ar-H 2 plasma generated by radio frequency inductively coupled plasma (RF-ICP) torch has been made. An approximate two-stage approach has been proposed to calculate the spatial-temporal distributions of temperature and resulting thermal stress in quartz particles during dynamic heating in polydisperse plasma flow. The influence of working gas compositions, particle size distributions, injection angle and flow rate of carrier gas on the thermal destruction conditions of quartz particles has been determined under different particle feed rates. It is found that all the solid quartz particles (0.1-0.4 mm) could be thermal destructed without overheating in RF-ICP torch system, when the hydrogen volume fraction in working gases is more than 1.5%-2% and particle feed rate is in a certain range. The values of the maximum and minimum feed rates have been determined under different hydrogen volume fractions. An optimal particle injection angle and flow rate of carrier gas is found around 50°-60°and 160-220 slpm, under which the value of maximum equivalent thermal stress in quartz particles is highest.

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Section: Resultssupporting

confidence: 74%

Dynamic heating and thermal destruction conditions of quartz particles in polydisperse plasma flow of RF-ICP torch system

Miao¹,

Grishin²

2020

Plasma Sci. Technol.

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“…A when Z 1 78 mm the vortex flow pattern in the TICP torch would be significantly different in the central and sheath diffusion cases. In the sheath diffusion case the vortex is remain under a circular (or toroidal) flow pattern [19], part of the central gas streams still could penetrate the vortex and directly flow into the high temperature zone (figure 3…”

Section: Comparison Of Thermal-concentration Fields With Numer-mentioning

confidence: 99%

“…They are rebounding from the plasma after encountering the reversed flow (frontal vortex) on the upstream side of discharge zone [18]. While with the increase of flow rate of central gas [16] or shift of injection probe tip downstream [19], part of the central gas flow could penetrate the frontal vortex zone and 'open' an axial hole, through which all the particles could be supplied into the high temperature zone without entrainment. However, in this case the particle resident time in the high temperature zone reduces and their processing efficiency decrease [20,21].…”

Section: Introductionmentioning

confidence: 99%

Gas dynamic-thermal-concentration fields and evaporation process of quartz particles in Ar–H₂inductively coupled plasma

Miao¹,

Grishin²

2020

Plasma Sources Sci. Technol.

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The gas dynamic-thermal-concentration fields and evaporation process of quartz particles in the TICP torch of argon-hydrogen plasma have been studied. The effects of different methods of supplying hydrogen on the hydrogen concentration and gas temperature distributions, as well as on the vortex flow patterns have been discussed. The particle injection conditions in the pure argon and argon-hydrogen plasma have been determined. The dependences of the axial gas temperature and velocity distributions on the hydrogen volume fraction, flow rate of central gas and particle feed rate have been established. The effect of hydrogen volume fraction and different methods of supplying hydrogen on the evaporation degree of quartz particle in the TICP torch has been determined. The influences of the particle injection conditions (flow rate of central gas, probe tip position and injection patterns) on the evaporation degree in the TICP torch have also been evaluated. The specific heat cost for quartz particle evaporation has been calculated to evaluate the utilization efficiency of thermal energy.

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“…Вниз по потоку этот вихрь ограничен сечением, проходящим через середину (плоскость второго витка) индуктора, где в приосевой области давление имеет максимальное значение. При расходе транспортирующего газа Q 1 ≤ Q cr (J K ) ≈ 1.7−2.2 l/min вихрь (типа Бенара [32]) сомкнут на оси плазмотрона. В данном режиме течения в зоне контакта внутренних поверхностей вихревого тора на оси плазмотрона образуется поток, скорость которого направлена навстречу поступающим в разряд потокам транспортирующего и плазмообразующего газов.…”

Section: результаты расчетов и обсуждениеunclassified

“…В данном режиме течения в зоне контакта внутренних поверхностей вихревого тора на оси плазмотрона образуется поток, скорость которого направлена навстречу поступающим в разряд потокам транспортирующего и плазмообразующего газов. В случае расходов транспортирующего газа Q 1 , больших Q cr , образуется вихрь кольцевой формы с осевой полостью, через которую основная часть потока транспортирующего газа течет в осевом направлении непосредственно в высокотемпературную область разряда [32]. Причем важно отметить, что скорости движения газа на внутренних поверхностях вихревого тора и скорости осевого потока противоположны.…”

Section: результаты расчетов и обсуждениеunclassified

О Выборе Параметров Высокочастотного Индукционного Плазмотрона И Дисперсного Потока Испаряемых Кварцевых Частиц

Miao¹,

Гришин²

2020

Журнал Технической Физики

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Numerical simulation of the heating and evaporation processes of quartz particles in a technical induction plasma torch of argon plasma was performed in the framework of a two-phase collisionless monodisperse model. The particle supply conditions within a full and partial penetration through the frontal ring-type vortex into discharge zone were determined. The dependences of the evaporation degree and specific energy cost for evaporation on the main operation parameters of the particle processes, primarily the coupled power of plasma torch, as well as the particle size, feed rate and entry angle into the discharge zone were established. The recommendations on the choice of the optimal operation parameters of the plasma torch and the flow parameters of quartz particles were given. It was shown that the technical induction plasma torch with a coupled power of about 5 kW can provide a complete evaporation of the quartz particles with sizes up to 50 – 70 μm and mass flow rate of up to (8 – 10) ‧10-5 kg/s under a specific energy cost at 50 MJ/kg

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Studies of vortex characteristics and gas-dynamic fields in Ar-H2 inductively coupled plasma

Cited by 7 publications

References 32 publications

Dynamic heating and thermal destruction conditions of quartz particles in polydisperse plasma flow of RF-ICP torch system

Dynamic heating and thermal destruction conditions of quartz particles in polydisperse plasma flow of RF-ICP torch system

Gas dynamic-thermal-concentration fields and evaporation process of quartz particles in Ar–H₂inductively coupled plasma

О Выборе Параметров Высокочастотного Индукционного Плазмотрона И Дисперсного Потока Испаряемых Кварцевых Частиц

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Studies of vortex characteristics and gas-dynamic fields in Ar-H2 inductively coupled plasma

Cited by 7 publications

References 32 publications

Dynamic heating and thermal destruction conditions of quartz particles in polydisperse plasma flow of RF-ICP torch system

Dynamic heating and thermal destruction conditions of quartz particles in polydisperse plasma flow of RF-ICP torch system

Gas dynamic-thermal-concentration fields and evaporation process of quartz particles in Ar–H2inductively coupled plasma

О Выборе Параметров Высокочастотного Индукционного Плазмотрона И Дисперсного Потока Испаряемых Кварцевых Частиц

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Gas dynamic-thermal-concentration fields and evaporation process of quartz particles in Ar–H₂inductively coupled plasma