Surya Prakash, R and Boggavarapu, P and Ravikrishna, RV (2020) Effect of ambient density on single drop breakup - An experimental study. In: 14th International Conference on Liquid Atomization and Spray Systems, ICLASS 2018, 22-26 July 2018, Chicago; United States.
Full text not available from this repository. (Request a copy)Abstract
Secondary atomization has been the subject of interest for many research groups - the most curious manifestation is found in the nature in the form of rain drops. While there have been several experimental studies at ambient conditions which involve real-world density ratios (R = �liq / �gas > 500), most of the numerical investigations have been at much lower density ratios (R < 50). The current study aims to conduct single drop breakup experiments at low density ratios - conditions which are found in most operating conditions inside the engines. The experimental setup comprises primarily of a high-pressure chamber (10 bar) which houses both the mono-disperse drop generator and a contoured nozzle to produce the required air jet. The chamber also has appropriate optical access for visualization. The prominent parameter that characterizes secondary breakup - aerodynamic Weber number (We) is varied by controlling the air jet velocity. Elevating the chamber pressure to 10 bar results in lower R (up to ~75). Two different liquids and drop sizes are employed the verify the veracity of the observed results. It is observed that even at a lower density ratio the critical Weber number tends to remain the same (We ~ 10). A new breakup structure is observed to occur intermittently along with bag and bag-stamen breakup modes in the form of 'reverse-hat' structures. The lower density ratios are also observed to apparently advance shorten all the previously observed breakup modes. The present study has thrown more light on the effect low density on secondary breakup, parts of which have been grey areas in our understanding. © 2018 Solar Turbines Incorporated.
| Item Type: | Conference Paper |
|---|---|
| Publication: | ICLASS 2018 - 14th International Conference on Liquid Atomization and Spray Systems |
| Publisher: | ILASS Europe, Institute for Liquid Atomization and Spray Systems |
| Additional Information: | The copyright of this article belongs to ILASS Europe, Institute for Liquid Atomization and Spray Systems |
| Department/Centre: | Division of Mechanical Sciences > Mechanical Engineering |
| Date Deposited: | 03 Mar 2021 05:33 |
| Last Modified: | 03 Mar 2021 05:33 |
| URI: | http://eprints.iisc.ac.in/id/eprint/66639 |
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