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Deformation, Fragmentation and Vaporization of Volatile Liquid Droplets in Shock-Laden Environments

Redding, Jeremy
http://orcid.org/0000-0001-8012-2101
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1613745275535815

Abstract Details

2020, MS, University of Cincinnati, Engineering and Applied Science: Aerospace Engineering.
This study quantitatively investigates the fundamental physics underlying the deformation, atomization, and vaporization of volatile liquid fuel droplets impacted by a normal shock wave using a high-fidelity, VOF-DIM (volume of fluid – diffuse interface method)-based methodology. The “Stiffened Gas” equation of state is used to model the liquid and a modified Kapila method is used to account for surface tension and viscosity. A thermal-mechanical-chemical equilibrium relaxation procedure is implemented to simulate vaporization. Because of the unavailability of experimental data on a fragmenting and vaporizing droplet as it interacts with shock waves, the framework is first validated against measurements of droplet-shock interactions of a non-vaporizing water droplet, showing excellent agreement. Next, the vaporization model is benchmarked against the d2-law. Once both vaporization and shock wave dynamics have been validated against available experimental data, we investigate the atomization and vaporization of a dodecane droplet as it interacts with a shock wave traveling at a Mach number of 6.5. When the vaporization model is not enabled, heat transfer and mass transfer are not considered, and shockwave dynamics are similar to that of water, where their breakup morphology is dependent on Weber number. When vaporization is enabled, aerothermal heating from shockwave impact and high temperatures in the post shock region provide sufficient heating for volatile liquid droplets to undergo vaporization. When the droplet is vaporizing, it can be shown that some of the vapor plume is forced in the direction opposing the shockwave, an effect which is lessened as the Mach wave strength increases. Furthermore, regions of entrainment of the liquid, as well as spacing between the retransmitted wave and the end of the vapor plume are discussed with respect to Mach number. Due to the significant effect the Mach number has on the dynamics of the vapor flow field, it is used for a basis of comparison between test cases.
Prashant Khare, Ph.D. (Committee Chair)
Shaaban Abdallah, Ph.D. (Committee Member)
Jongguen Lee, Ph.D. (Committee Member)
67 p.
Aerospace Materials
shock-liquid interaction; droplet vaporization; volatile liquid fuel; supersonic; hypersonic; droplet fragmentation

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Citations

  • Redding, J. (2020). Deformation, Fragmentation and Vaporization of Volatile Liquid Droplets in Shock-Laden Environments [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1613745275535815

    APA Style (7th edition)

  • Redding, Jeremy. Deformation, Fragmentation and Vaporization of Volatile Liquid Droplets in Shock-Laden Environments. 2020. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1613745275535815.

    MLA Style (8th edition)

  • Redding, Jeremy. "Deformation, Fragmentation and Vaporization of Volatile Liquid Droplets in Shock-Laden Environments." Master's thesis, University of Cincinnati, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1613745275535815

    Chicago Manual of Style (17th edition)

ucin1613745275535815
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This open access ETD is published by University of Cincinnati and OhioLINK.