Multi-phase flow and drying characteristics in a semi-circular impinging stream dryer

Huai, Xiulan; Peng, Xiaofeng; Wang, Guoxiang; Liu, D. Y.

doi:10.1016/s0017-9310(03)00051-6

Cited by 19 publications

(10 citation statements)

References 11 publications

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“…They observed that reasonably designing the geometrical structure and inlet condition parameters (inlet air velocity, granular material flux, initial moisture content, etc.) could increase the drying efficiency with low energy consumption and operating costs [25]. Zhang et al investigated the flow and mixing characteristics of two-dimensional confined impinging streams with uniform and nonuniform inlet jets by means of the lattice Boltzmann method.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Studies on Flow and Turbulence Characteristics of Impinging Stream Reactors with Dynamic Inlet Velocity Variation

Liu

Yue²,

et al. 2018

Energies

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Impinging stream technique has been widely used in engineering industries. Insufficient data are available on the effects of dynamic inflow conditions on the flow and turbulence characteristics of an impinging stream reactor. In this study, we investigate and discuss the flow and turbulence characteristics of an impinging stream reactor with dynamic inlet velocity variation, e.g., sinusoidal, parabolic, step or triangular variation. The effects of period, amplitude, phase difference, mean inlet velocity and type of dynamic inlet velocity variation on the motional behaviors of the impinging surface and the mean turbulence kinetic energy (k) of the impingement region are investigated and discussed using particle image velocimetry (PIV) and computational fluid dynamics (CFD) at various values of L/D (the ratio of impinging spacing to nozzle diameter). The results show that the impinging surface makes back-and-forth motions in impinging stream reactors with dynamic inlet velocity variation. The mean k of the impingement region during one period is dominated by both the inlet velocity conditions and the geometric configuration. Dynamic inflow conditions bring more turbulence energy and pulsating characteristics to impinging zones over constant inlet velocity for an instantaneously moving impinging surface. Impinging stream reactors with dynamic inlet velocity variation provides more intense turbulence properties over conventional impinging stream reactors at the same mean inlet velocity. This work shows that the impinging streams with dynamic inlet velocity variation has strong potential for future relevant reactors and processes for engineering applications.

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Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Studies on Flow and Turbulence Characteristics of Impinging Stream Reactors with Dynamic Inlet Velocity Variation

Liu

Yue²,

et al. 2018

Energies

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“…Wet particles at the impingement plane encounter penetrations and oscillatory motions until their velocity eventually vanishes and they are carried away from the impinging chamber. Because of the specific motion of the particles in the impinging zone, the mean residence time is greatly prolonged (Huai et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

“…High efficiency, quality of products, great drying intensity, short time, and low energy consumption are among the advantageous characteristics of an ISD, and impinging stream dryers are also expected to have a wide application in engineering processes (Huai et al, 2003). Tamir et al (1984) developed an ISD and successfully tested it in evaporation experiments.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Modeling and Simulation of Drying of a Single Wet Particle in a Coaxial Impinging Stream Dryer

Rahimi

Niksiar

2010

Chemical Engineering Communications

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In this study two simple mathematical models are proposed to describe the drying process of wet particles in a coaxial impinging stream dryer. The models represent the particles in two conditions, surface and internal moisture, which are solved numerically. The effect of various parameters including particle diameter, air velocity, and air temperature are investigated on the final moisture content of the product. In addition, drying intensity of the coaxial impinging stream dryer is compared with the other common dryers. This comparison leads to the conclusion of the high efficiency of impinging stream dryers at higher air velocity and smaller particles. Comparing the results of the models with available experimental data shows that the numerical predications are in good agreement with the experimental ones.

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“…When the opposing streams collide, a small zone with high turbulent intensity is produced and offers excellent enhancement for the heat and mass transfer. Because of the high efficiency of impinging streams, it has many applications in the chemical and food industry as an alternative to conventional unit operations, which are well summarized by many researchers [2][3][4][5][6][7][8][9][10]. Recently, impinging streams have been widely used in the water-coal slurry gasification process by Wu and Guo [11,12].…”

Section: Introductionmentioning

confidence: 99%

Residence time distribution and modeling of the liquid phase in an impinging stream reactor

Wang

et al. 2009

Front. Chem. Eng. China

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Based on some experimental investigations of liquid phase residence time distribution (RTD) in an impinging stream reactor, a two-dimensional plug-flow dispersion model for predicting the liquid phase RTD in the reactor was proposed. The calculation results of the model can be in good agreement with the experimental RTD under different operating conditions. The axial liquid dispersion coefficient increases monotonously with the increasing liquid flux, but is almost independent of gas flux. As the liquid flux and the gas flux increase, the liquid dispersion coefficient of center-to-wall decreases. The axial liquid dispersion coefficient is much larger than that of center-to-wall, which indicates that the liquid RTD is dominated mainly by axial liquid dispersion in the impinging stream reactor.

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Multi-phase flow and drying characteristics in a semi-circular impinging stream dryer

Cited by 19 publications

References 11 publications

Experimental and Numerical Studies on Flow and Turbulence Characteristics of Impinging Stream Reactors with Dynamic Inlet Velocity Variation

Experimental and Numerical Studies on Flow and Turbulence Characteristics of Impinging Stream Reactors with Dynamic Inlet Velocity Variation

Mathematical Modeling and Simulation of Drying of a Single Wet Particle in a Coaxial Impinging Stream Dryer

Residence time distribution and modeling of the liquid phase in an impinging stream reactor

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