A handheld bicycle pump can be used as an atomizer to generate a fine a small of paint or pesticide by forcing air at a high velocity through a small hole and placing a short tube between the liquid reservoir and high-speed air jet whose low pressure derives the liquid up through the tube. In such an atomizer, the hole diameter is 0.3 cm, the vertical distance between the liquid level in the tube and hole is 10 cm, and the bore (diameter) and the stroke of the air pump are 5 cm and 20 cm, respectively. If the atmospheric conditions are 20° C and 95 kPa, determine the minimum speed that the position must be moved in the cylinder during pumping to initiate the atomizing effect. The liquid reservoir is open to the atmosphere.
FIGURE P12-44
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