Aerodynamic stream formation

A velocity profile Aerodynamics Blade twist extent Intensity of blade twist Stream formation The momentum... 

The mechanism is essentially a combination of the deformation of a round liquid jet by aerodynamic forces and the instability of the deformed jet. The liquid jet is first accelerated rapidly in the high speed air stream (Fig. 3.3b). The jet diameter is thus significantly reduced as it interacts with the surrounding air stream. The direction of the thinning capillary liquid jet is influenced by the interaction between the liquid jet and the turbulent structures of the surrounding air stream. The formation of... 

In gas dynamic atomization, a liquid stream is broken-up into small entities which are dried very quickly. Because the formation of droplets occurs in aerodynamic suspension, the material experiences no shear and the liquid temperature does not rise above the local dew point, despite high gas temperatures. Since drying and subsequent cooling are rapid, organic materials do not have time to oxidize, degrade, or experience any other damage. Food powders often exhibit better flavor, texture, and instant characteristics than comparable powders from other spray dryers. Because a low pressure stream of slurry is pumped and dispensed, the system can also handle corrosive and abrasive products easily. Control over particle size is normally better. Fig. 7.82 depicts SEM photographs of some typical products. 

Vortex gas flow is a complex form of movement is entirely dependent on the design parameters are tightening devices. These devices determine the aerodynamic characteristics and flow chambers the degree of twist, hydraulic resistance, structure and uneven speed, features recirculation zones, injection capacity, turbulence intensity. Possibility of a tangential inlet gas into the unit and the formation of internal swirling flows are extremely diverse. However, despite the differences of known devices in design, size and purpose, formed in these gas streams have common patterns. 

The analysis of the saved up experimental data (Abramovich, 1953) shows that presence of the central pipe does not influence essentially stream aerodynamic characteristics at its relative sizes, which are not exceeding halfs of diameter of the cylindrical channel d D < 0.5. At dJD > 0.5, the aerodynamic formation of a stream undergoes already serious changes leading more to a uniform distribution of speeds in ring cross-section of the body. 

For a two-phase stream essential effect on aerodynamic formation of a stream magnitude of relative loading on a liquid L = UG renders, kilograms per kilogram. Thus L practically does not influence distribution axial, but considerably reduces an average value of tangential speeds. The form of profiles =f(R) thus remains identical (Mustashkin, 1970 and... 

The analysis of known builds of rotary connections has allowed to reveal major factors (loading on a liquid phase, a monkey wall, and a stream breakaway, discharge coimection sizes), working upon aerodynamic formation of a stream. 

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