Performances of impinging streams

On the other hand, the assembly condition and the inter-molecule force of liquids are quite different from those of solids. In gas-continuous impinging streams with solid and liquid as the dispersed phases, respectively, some different phenomena would occur, which may affect the performance of impinging streams and thus are of concern. This chapter discusses the problem of liquid dispersion in gas-continuous impinging streams, which is related to the topic mentioned above, and introduces the related results of investigations. 

Influences of property differences on the performance of impinging streams... 

The significant differences between the properties of liquids and gases result in totally different performances of impinging streams with liquid and gas as the continuous phase, as discussed below. 

Since there are significant differences of properties and performances between gas-and liquid-continuous impinging streams, the two kinds of impinging streams will be discussed separately in this book. 

A theoretical analysis is helpful for understanding the basic characteristics of impinging stream processes and the performances of the related devices. In an impinging stream device, where the residence time distribution of particles is most important is in the impingement zone, because this zone is the major active region for heat and mass transfer between phases in such a device. Unfortunately, it is basically... 

From the discussions above we can see that, because of the significant differences between the properties of liquid and gas, the two kinds of impinging stream with liquid and gas as the continuous phase, respectively, give totally different performances. From the point of view of taxonomy, it is necessary to distinguish them. Therefore a supplementary classification should be made according to continuous phase, i.e., impinging streams should also be classified according to the continuous phase involved in ... 

Assimilating positive and negative the experiences obtained in the past, the author of this book has developed the Circulative Impinging Stream Dryer , an IS device suitable for powdery and/or granular materials [11, 82]. A test with quasi-industrial equipment on a scale of 1000 tones per year has exhibited good performance, and practical application may be expected in the near future. 

The results described in Section 7.5 illustrate that the application of gas-continuous impinging stream gas-liquid reactor for the wet desulfurization of flue gas performs to good effect. Gas-liquid reaction is a large category of important reactions involved in many processing industries, among which many systems involve fast or instantaneous... 

Because the properties of liquids are essentially different from those of gases, impinging streams with liquid and gas as the continuous phases exhibit totally different performances and it is therefore necessary to discuss them separately. Part II focuses on liquid-continuous impinging streams and related problems, including the features of LIS that efficiently promote micromixing, pressure fluctuation phenomena in LIS, promotion of kinetic processes by LIS, and the application of LIS in the preparation of ultrafine particles, etc. Finally, this we will introduce some important research and development on LIS devices and look forward to the future applications of LIS. 

The liquid-continuous impinging stream (LFS) device has the features of efficient micromixing and strong pressure fluctuation and, being the major equipment in the preparation of ultrafine powders by reaction-precipitation, it has exhibited excellent performances in a number of application cases. However, of the various preparation... 

Also, the results above verify again that the submerged circulative impinging stream reactor is especially suitable for the preparation of ultrafine particles by reaction-precipitation and exhibits very good performance. 

Kitron, Y. and Tamir, A. (1988). Performance of a coaxial gas-solid two impinging streams (TIS) reactor Hydrodynamics, residence time distribution and drying heat transfer. I EC Research, 27 1760-1767. 

Tamir, A. and Grinholtz, M. (1987). Performance of a continuous solid-liquid two-impinging-stream reactor. I EC Research, 26 726-731. 

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