Vibrating orifice aerosol generator

FIGURE 11.77 Schematic diagram of vibrating-orifice aerosol generator (from Hinds, 1982). 

Figure 6 A vibrating-orifice aerosol generator (TSI Model 3450).

Constant-ouput atomizer, tri-jet aerosol generator, electrostatic classifier, vibrating-orifice aerosol generator, fluidized-bed aerosol... 

Figure 11 Magnified diagrams of monodisperse aerosol-generating devices. (A) Spinning-disk aerosol generator. (B) Vibrating orifice aerosol generator.

The droplet size delivered from a vibrating orifice monodisperse aerosol generator can be derived from the following expressions ... 

There are a number of techniques for generating aerosols, and these are discussed in detail in the LBL report (1979) and in volumes edited by Willeke (1980) and Liu et al. (1984). We briefly review here the major methods currently in use these include atomizers and nebulizers, vibrating orifices, spinning disks, the electrical mobility analyzer discussed earlier, dry powder dispersion, tube furnaces, and condensation of vapors from the gas phase. 

Another common method of generating particles with diameters 0.5-50 /rm is the Berglund-Liu (1973) vibrating-orifice generator shown schematically in Fig. 11.77. The solution to be aerosolized is pumped through a small orifice 5-20 /xm in diameter. The orifice is oscillated by a piezoelectric crystal so that the liquid stream is broken on each oscillation, forming a small liquid particle that is carried away in a stream of air. 

Experimental evaluation of various widely used commercial instruments has been undertaken by several investigators, including Liu et al. (1974), who used the vibrating orifice technique to generate spherical aerosols with narrow size distributions. Similarly, Pinnick and Auvermann (1979) generated droplets of a solution which were dried to make solid particles for evaluating the response of... 

The vibrating-orifice monodisperse method of aerosol generation is based on the principle of the disintegration of a jet of liquid issuing from an orifice that is... 

TouchSpray can best be described as a vibrating-orifice ultrasonic nebulizer and was developed by the Technology Partnership (TTP), U.K. This technology has only recently been announced and little is as yet published (26). This new method for aerosol generation is compact (Fig. 11) and based on sound pressure, which forces fluids through small holes in a membrane. Unlike traditional... 

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