Nozzles position, influence

The generation and subsequent dispersal pattern of droplets from an aircraft is influenced by droplet size, the aircraft wake, meteorology, nozzle positioning and... 

The ejector was characterized at a test bench that was equipped with a needle valve in the ejector off gas pipe to simulate the pressure drop of reformer and stack and enable a controlled back-pressure. Nitrogen was used as suction gas because of its comparable density with the expected AOG. Resulting recycle ratios as function of the adjusted back-pressure are shown in Figure 8. To investigate the influence of the ejector geometry mixing channel diameters between 2 and 4.5 mm and different nozzle positions were tested. 

Stream and generated a vortex flow which leads to a faster droplet freezing as well as a droplet deflection to prevent droplet collisions. The temperature was reduced at the nozzle position from room temperature to —75 °C for gas flows ranging between 17 and 34 L/min (Fig. 10.12). Different nozzle positions inside the vortex were evaluated experimentally. Additionally, the influence of the airflow of the cold gas... 

The residence time of the gas in the reduction zone is calculated with the approximated gas flow and the given geometry. The maximum residence time is t (air nozzles at position 3), which corresponds to a mean residence time of about 2 for most of the experiments. If the air is injected through the nozzles at position 2, the resulting mean residence time is shortened to about 5/9 t. The measurements indicate little influence of... 

The first variant is the collect-and-place principle based on a revolver head (horizontal rotational axis) on a two-axis gantry system. Severtil components are collected within one placement circle and the positioning time per component is reduced. Additionally, operations such as component centering are carried out while the nozzle at the bottom (pick-up) position is collecting the next component, and the centering does not influence the placement time. 

Spray characteristics influence nozzle placement. Figure 8.13a through c indicate gun positioning concerns for multinozzle configurations. Ideally, sprayed material extends uniformly across the par-ticle/tablet bed as shown in Figure 8.13c. Undesired deviations from uniformity include the following ... 

The choice of an electrode type and size and of the welding current is influenced by the type and thickness of the parent metal to be welded or cut. The capacity of tungsten electrodes to carry current is dependent upon a number of other factors, in particular, the type of equipment used (gas- or water-cooled), the extension of the electrode beyond the nozzle and the welding position used. 

At constant position and spraying parameters (suspension and nozzle gas mass flow) also the sprayed feed has an influence on the resulting droplet sizes. Compared to pure water, the characteristic droplet sizes increase if a suspension consisting of water and ceramic primary particles is spray dried. A further size increase was detected at additional binder addition (Fig. 11.35), what might be an effect of changed suspension properties (surface tension, viscosity, etc.). 

The transmitter and the receiver housing are mounted on a sensor carrier, which mechanically rigidly connects them to each other. Due to the U-shaped configuration of the sensor carrier, an influence of the sensor carrier on the sprays in the measurement volume is prevented. The sensor carrier is mounted on a linear axis system that provides an exact positioning of the measurement volume of the sensor in the sprays in two axes. The transmitter and the receiver module are sealed by mounted covers. Hence, the purging gas flows exclusively in the direction of the measurement volume out of the sensor modules. A relative shifting of the atomization nozzle, and the sensor carrier, is performed via a displacement of the nozzle. 

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