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Unformatted text preview: Drag The trajectory of an ink droplet stream ejecting horizontally out of an inkjet printer is photographed as shown below. It is counterintuitive that the droplet stream can stay horizontal for a long distance and then suddenly makes a sharp turn and drops down to the ground. We are going to determine that this type of droplet trajectory is feasible if we take into consideration of the aerodynamic drag on the droplet. Primary droplet steam Inkjet printhead Problem Statement Our calculation will be based on the following data: droplet velocity coming out of the nozzle, 5 m/s, droplet diameter 50 m, dynamic viscosity of air =1.8x10-5 (N.s/m 2 ), density of air 1.225 kg/m 3 . Due to the initial high ejection speed, the droplet Reynolds number is expected to exceed 1, the upper limit that the Stokes law is still applicable. However, as will be shown later, the droplet velocity decreases exponentially and we are going to assume that the Stokes law is valid at all time for simplicity. that the Stokes law is valid at all time for simplicity....
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This note was uploaded on 11/27/2011 for the course EML 3002c taught by Professor Staff during the Fall '08 term at FSU.
- Fall '08
- Mechanical Engineering