By Yuan Wu
The unique concept of IS is to ship solid-gas streams to impinge opposed to one another at excessive pace, bettering move among levels. IS is assessed into types: Gas-continuous impinging streams (GIS) and Liquid-continuous ones (LIS). Impinging Streams describes basics, significant houses and alertness of IS, as a class of novel applied sciences in chemical engineering. as a result of universality of move phenomena, it truly is receiving frequent cognizance. This e-book represents the 1st ebook during this region for over 10 years and covers achievements and applied sciences.
* describing in actual fact the houses of Gas-continuous and Liquid-continuous impinging streams
* introducing new technical units
* contains a variety of labored program circumstances, that are illustrated intimately
Read or Download Impinging Streams: Fundamentals, Properties and Applications PDF
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Additional info for Impinging Streams: Fundamentals, Properties and Applications
15) (u,,-up) For the transient regime, using Eq. 17) describe variations in the velocity of the particle with the traveled distance, with the initial condition below . , the length from the point at which the particles enter to the exit of the gas conduit, is an important structure parameter for impinging stream equipment. Theoretically, particles can be accelerated by gas flow to a velocity close to that of the gas, Ug, provided the accelerating tube is long enough. However, a longer accelerating tube will result in increased hydraulic resistance of the system, and is not practically applicable.
They provided an excellent photograph of the flow behavior of free impinging round jets issuing into ambient air at rest through bell-shaped convergent nozzles, as shown in Fig. 3. 3 Streamlines in circle impinging streams . Possibly because the mixing problem involved was not fully considered, the interaction between the two opposing streams in impingement has not received enough attention in earlier investigations. A typical example is the mirror image model proposed by Powell , which takes the impingement between two opposing streams as two streams, independent of each other, impinging the same rigid plane from opposite directions.
The mean axial velocity profile has a similar shape to the curve of ux/uo vs x. The gradient of the time-averaged axial velocity takes the maximum at the stagnation plane, while it approaches zero near the nozzle. The mean velocity field is found to be self-similar for all the nozzle exit velocities, distances between nozzles and turbulence generators tested. This similarity allows the mean axial velocity traverses to be normalized so that all the measured data lie on the same curve. The shape of the curve is similar to that given in Fig.