Droplet size factors governing

Weiss and Worsham 259 indicated that the most important factor governing mean droplet size in a spray is the relative velocity between air and liquid, and droplet size distribution depends on the range of excitable wavelengths on the surface of a liquid sheet. The shorter wavelength limit is due to viscous damping, whereas the longer wavelengths are limited by inertia effects. 

Generally, the occurrence of a specific mode is determined by droplet impact properties (size, velocity, temperature), surface properties (temperature, roughness, wetting), and their thermophysical properties (thermal conductivity, thermal capacity, density, surface tension, droplet viscosity). It appeared that the surface temperature and the impact Weber number are the most critical factors governing both the droplet breakup behavior and ensuing heat transfer. I335 412 415]... 

In spinning disk atomization, the factors governing the size of the droplets are the acceleration, a, or centrifngal forces, which tend to detach the drop, and the surfece tension o, which holds the drop in position. The acceleration is the result of the angular velocity of the disk (co) and the radins (Eqnation 6.16). 

The particle size in microemulsion is essentially governed by two factors [30], namely (1) the number of droplets in the preparation and (2) the inter-particle interaction associated... 

Product losses in evaporator vapor may result from foaming, ing, or entrainment. Primary separation of liquid from vapor is accomplished in the vapor head by making the horizontal plan area large enough so that most of the entrained droplets can settle out against the rising flow of vapor. Allowable velocities are governed by the Souders-Brown equation V = kV(pi — p )/p , in which k depends on the size distribution of droplets and the decontamination factor F desired. For most evaporators and for F between 100 and 10,000, k =... 

Lens. A compact lens with a suitable magnification should be chosen. The size of the droplets to be measured is the governing factor. The measurement... 

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