The distance traveled by a drop until it is completely affected by air depends on its size, shape, and density. Since the common atomizers are independent of air flow while in fine atomizers, such flow should be taken into account (Barbosa–Cánovas and Vega–Mercado, 1996). Atomization movement can be classified according to dryer design as cocurrent, countercurrent, or mixed flow (Figure 17.20). The atomization movement can be explained for a simple droplet. The forces that act on a droplet are:
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