Impingement between opposing streams

It is found from experimental measurements that the pressure drop caused by the impingement between the opposing streams is independent of the presence of particles. 

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The larger the value for cr, the greater the scattering of the size distribution, and, correspondingly, the poorer the uniformity of the droplet sizes. Part of the data measured at various air-to-liquid mass flow ratio, m.JmL, are shown in Table 5.1. It can be seen that, normally, the impingement between opposing droplets-in-gas suspension streams makes cr smaller. Only those obtained at in the third column of the... 

The major disadvantage of the mirror image model is that the interaction between the two opposing streams in impingement was not considered. In fact, even in laminar impinging streams, such an interaction cannot be negligible. 

As mentioned in the Introduction, the impingement between two opposing streams is quite different from a single jet impinging on a rigid wall surface. 

As mentioned above, in impinging streams, it is possible for the particle to penetrate to and fro many times between the two opposing streams. In other words, it would experience multiple decelerations-accelerations of motion. The time for each deceleration or acceleration motion, ruj or /aci (i = 1, 2, ) can be analyzed and calculated with the same principles and procedures as described above. Of course, the distance the particle travels in each of the deceleration stages,. v,u, can also be calculated however, those distances lack of significance, except for that in the first deceleration stage,. vdj =. vmav... 

Consider the impingement between two opposed particles-gas suspension streams from accelerating tubes of the same diameter. The assumptions made in the establishment of the model are (1) The streams are symmetrical with respect to both the jet axis and the impingement plane (2) The gas flow velocity and all the physical properties of gas and solid are kept constant and (3) The particles beyond collision penetrate into the opposing stream up to. rlllas, while any particle will be drawn out of the system immediately once it collides with another particle. 

On the resistance constitution of the equipment system, the major conclusions that can be drawn from the investigation are (1) Where millets or rapeseeds are the material to be processed, the power for the operation of the impinging stream contactor is mainly (>80%) consumed in the acceleration of particles (2) The pressure loss due to the impingement between the opposing streams is independent of the presence of solid particles. 

In order to obtain experimental evidence for understanding the influence of the impingement between the opposing droplets-in-gas suspension streams on the dispersity of liquid, and also to get some practically applicable information for designing and operating impinging stream devices, the experimental investigation described below was carried out. 

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