Liquid-continuous impinging streams

Features of liquid-continuous impinging streams and their influences on kinetics... 

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. 

The discussions in this chapter relate to single phase impinging streams, the behavior of which may reflect part of those of multiphase impinging streams. Taking into account the similarities of liquid with gas, the discussions will also involve impinging streams of liquid alone while the differences between gas- and liquid-continuous impinging streams will be described in detail in the chapters of Part II. 

Tamir et al. [109] also studied an impinging stream absorber operated in bubbling mode, as shown in Fig. 7.3. The absorber takes liquid as the continuous phase while gas is dispersed in liquid, so it actually belongs to liquid-continuous impinging streams (LIS). The experimental results obtained showed that this flow configuration exhibits a higher absorption rate than that shown in Fig. 7.2(a). Combining them with the results... 

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. 

PROGRESS OF INVESTIGATION ON LIQUID-CONTINUOUS IMPINGING STREAMS... 

Both investigations employ the same reaction system for the determination of micromixing and the results from both investigations demonstrate that liquid-continuous impinging streams has the excellent feature of promoting micromixing efficiently. 

The pressure fluctuation in liquid-continuous impinging streams must affect the micromixing status and, consequently, it favors reaction kinetics. The substances related to this topic will be discussed in the following chapters. 

Therefore the pressure fluctuation in liquid-continuous impinging streams remains a problem needing further in-depth investigation. 

INFLUENCE OF LIQUID-CONTINUOUS IMPINGING STREAMS ON PROCESS KINETICS... 

As explained in Chapters 10 and 11, the existence of pressure fluctuation and the promotion of micromixing are the major features of liquid-continuous impinging streams. For processes occurring on the molecular scale in liquid or multiphase systems with a liquid as the continuous phase, these features have important implications. One of their valuable applications is the promotion of process kinetics. 

Secondly, it was described in the previous chapter that is pressure fluctuation in the operation of a liquid-continuous impinging stream device. The existence of pressure fluctuation implies the following ... 

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... 

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