Abstract
To understand the effects of droplet interaction on the drag coefficient and vaporization process, our experiment investigated the nonreacting and combustion history of a single stream of monosized droplets. Continuous monosized streams of fuel droplets were injected into quiescent surrounding air. An electronic device designed to modulate the droplet spacing C (ratio of interdroplet spacing to droplet diameter) was used. Measurements of droplet diameter, droplet velocity, and droplet temperature were performed using nonintrusive laser interoferometry. Ethanol was used as the simulation fluid throughout the experiment. The droplet stream was investigated in cold conditions to study the influence of droplet spacing on the drag coefficient. The data compiled for an extensive range of parameters (Re, droplet spacing) were compared with previous correlations from the literature. We propose a new correlation that improves the prediction of the drag coefficient for a large range of spacing parameter 2 2 law does not apply rigorously for interacting droplets, and so a corrective factor for burning rate was determined.
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