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A process requires the delivery of drops of volume 3

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A process requires the delivery of drops of volume 3.2×10−8 m3. A liquid has a density of 900 kg/m3 and a surface tension of 0.03 N/m. What size of capillary would you recommend to form these drops? In order to find the dripping rate, a simple criterion based on the Weber number can be used (Middleman, 1988b). The Weber number is defined as the dimensionless quantity ρv2dc/σ, where v is the flow velocity through the capillary. The value of the Weber number is suggested to be one at the onset of dripping. From this, calculate an estimate on the upper limit on the production rate from a single capillary in the units of kg of drops per hour. The drops are formed in air.

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