Abstract
Experimental Study on Secondary Breakup of Droplets at Low Density Ratios
Highlights
When a drop is accelerated in a gas flow, it deforms due to the aerodynamic forces and eventually fragments into smaller droplets; this is termed as secondary breakup
Weber number is gradually increased, and the resultant drop breakup structures are scrutinised to detect the regime of breakup they are undergoing
Summary and Conclusions Though secondary breakup has been extensively investigated in the past, there is still no clear understanding concerning the effect of density ratio (R), which is very relevant in practical applications such as gas turbine engines and IC engines
Summary
When a drop is accelerated in a gas flow, it deforms due to the aerodynamic forces and eventually fragments into smaller droplets; this is termed as secondary breakup. The secondary breakup of a drop can be broadly categorised into six modes of deformation and breakup, primarily based on the aerodynamic Weber number and liquid Ohnesorge number: Vibrational mode [1], [4], Bag mode [5], [6], Bag and Stamen [1] and bag with multiple lobes This phenomenon is thought to be due to Rayleigh-Taylor (RT) instability [6]–[8] or a combined RT/aerodynamic drag mechanism [2]. Lee & Reitz [14] performed experiments for a range of gas densities (corresponding to density ratios 100 1000) They concluded that the Rayleigh number (and the density ratio) have little effect on the drop breakup mechanisms, the transition Weber numbers vary a bit. Secondary breakup of droplets is studied at density ratios of around 75 by using a high-pressure chamber with optical access with an objective to improve the understanding the effect of density ration on the phenomenon
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