Question: 1. In designing a spray coating system, it is known that the behavior of a droplet as it strikes the surface is a function of

1. In designing a spray coating system, it is known that the behavior of a droplet as it strikes the surface is a function of liquid density, viscosity, surface tension, droplet size, droplet velocity, and surface roughness (characterized by a length scale e). The coating liquid is rather expensive, so you decide to run some preliminary test with water. You have the following information concerning the physical properties of the coating liquid: = 1.4H2O, = 2.2H2O, = 1.5H2O.

How would you select drop size and velocity and surface roughness relative to specified values in the actual application?

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