Impinging distance

Figures 1.6(c) and (d) show the pressure profile in the impinging streams. The profile is characterized by the considerable pressure gradients in the direction of the chamber axis, as shown in Fig. 1.6(c), and also in the perpendicular plane, as shown in Fig. 1.6(d). Obviously, in the region a little distance away from the impingement plane, the pressure profile is independent of the impinging distance. A decrease in the impinging distance leads to a more rapid increase in pressure only in the impingement zone.

Figure 1.9 Maxi mum static pressure vs impinging distance at the center of impingement plane.

The distance the particle travels in this stage is half of the impinging distance, S/2. Consequently, the time of particle motion in this stage, rc, is... 

The materials used in the experiments are millets and rapeseeds, the properties of which are identical to those listed in Table 3.1 (Chapter 3). All the experiments were carried out at room temperature, and the operating or structural conditions tested ranged as follows the velocity of the airflow in the accelerating tube w0= 9.48-17.36 m-s particles to gas mass flow rate ratio mp/ma = 0.556-1.0, and the dimensionless impinging distance SldiK = 3.0-6.7. 

To an extent, the intensity of impingement is dependent on the impinging distance, S, and smaller S implies stronger impingement. Therefore it is also of interest to understand the effect of the impinging distance on the size distribution of droplets. The... 

Influence of impinging distance on the standard deviation of droplet size distribution... 

Neither the air flow rate, the volume of the drying chamber, nor the impinging distance affects the values of the heat transfer coefficient no significant influences of the diameter of the particles or the feeding schemes on the heat transfer coefficient were observed. 

Run No Impingement distance S, mm Lower distance h, mm Impinging velocity o, nvs 1 Feed rate mv, kg-s Moisture content of product xf, kg-kg-1... 

To examine the reasonableness of the device structure, the effects of impinging distance, S, and placement of the nozzles are studied in certain ranges. 

The results on the influence of the impinging distance are shown in Fig. 7.17 as a plot of 77s versus the dimensionless impinging distance, S/d(). In the range tested the sulfur-removal efficiency decreases continuously as S/d() reduces. The most likely reason is that at smaller impinging distance the concentration of droplets in the impingement zone increases, giving enhanced collision between droplets and an increased tendency of the droplets to coalescence, thus reducing the interface area. On... 

The following optimal or feasible conditions and structural parameters were determined liquid to gas flow rate ratio VJVG = 0.85-1.OxlO 3 m3m 3 impinging velocity u0 = 10-15 m-s 1 dimensionless impinging distance S/d0> 4 molar ratio Ca/S = 1.0 for pseudo flue gas without C02 the nozzles were mounted at the outlets of the gas conduits ... 

The distances from the outlets of the conduits to the center where the two axes meet are equal (See Fig. 7.22), and the distance between the exits of the two conduits in each sub-group is the impinging distance . Depending on the requirement of the amount of liquid or suspension to be used, one nozzle or a set of nozzles can be installed inside each conduit with the exit(s) towards the same direction as the outlet of the conduit, i.e., towards the center of the absorption chamber. 

The major active region in impinging stream equipment (the impingement zone) is only a thin layer with a diameter 8-10 times that of the gas conduit and a thickness of about a quarter to a half of the impinging distance, so when only one pair of impinging streams is used the utilization factor of the space is very low. The addition of another pair of impinging streams approximately doubles the utilization factor of the space and doubles the gas flow rate that can be processed in the sub chamber for absorption. 

Impingement distance x Impingement angle a Impingement velocity... 

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