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Extra info for Aerosol Technology in Hazard Evaluation
13 Re 0 · 85 ). " When the pattern of flow depends only on fluid density and viscosity, results obtained using one fluid in a particular geometric arrangement are applicable to another fluid in a similar geometric arrangement provided the values of Re are the same in both cases. The curve of Fig. 3 spans four orders of magnitude for the drag coefficient and more than six for Reynolds number, yet the relationship has proved to be valid for a wide variety of fluids. In this way, phenomena that are difficult to handle in a particular fluid may be studied with a fluid more adaptable to experimentation.
14) Particle Dynamics 2-1 33 In this range, the resistance force is nearly proportional to the velocity and is not much affected by cylinder diameter. At low Reynolds numbers, the experimental data cited above indicate that the resistance force is proportional to velocity for particles of both spherical and nonspherical shape. The reciprocal of the constant of proportionality is called the particle's mechanical mobility, Z : Z = U/FR = KJ(3m,D), for spheres. 806A2 1,6 AT R , n is the number of unit spheres.
It is assumed that the vapor concentration goes to zero at large distances from the particle. For large values of R, the denominator in Eq. 42) approaches unity and Properties Affecting Aerosol Stability 2-2 49 the equation becomes that of Langmuir  for evaporation controlled by diffusion of molecules away from the droplet. For droplets of water or aqueous solutions or suspensions, the vapor concentration at a distance from the droplet has a value of ßC(Ta), where ß is the relative humidity expressed as a fraction, and C(Ta) is the saturated vapor concentration at ambient temperature Ta.