Impinging distance dimensionless

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. 

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 electrode is uniformly accessible to the diffusing ions within dimensionless electrode radius, 0.1 < R/d < 1.0, for turbulent nozzle flow and, 0.1 < R/d < 0.5, for laminar nozzle flow. Within the region of uniform accessibility, the mass transport rate is relatively independent of the electrode size in both laminar and turbulent flow for 0.2 < Hjd < 6, where H is the nozzle-to-plate distance. Beyond the region of uniform accessibility, the mass transfer rate decreases with the radial distance. In the intermediate range, 1 < R/d < 4, the turbulent impinging jet changes from the stagnation flow to the wall-jet flow and for R/d > 4 the wall-jet flow predominates (- wall-jet electrode). 

Another important dimensionless variable is the ratio of chamber-to-pintle diameters, djdp. Typical values for this quantity range from 3 to 5 [2]. Finally, the skip distance is defined as the length that the annular flow must travel before impacting the radial holes divided by the pintle diameter, LJd. A typical value for this parameter is around 1 larger skip distances are subject to substantial deceleration of the liquid due to friction against the pintle post whUe very short skip distances may lead to spray impingement on the head-end of the combustion chamber. 

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