Droplet evaporation in a convective environment plays a crucial role in many industrial and natural processes such as spray combustion, food processing, spread of respiratory diseases, and cloud formation.
In this talk, I’ll present a high-fidelity hybrid sharp-interface immersed boundary/front-tracking method developed for interface-resolved direct numerical simulations of droplet evaporation and its application to droplet evaporation in convective environments. The droplet is fully deformable and the Clasius-Clapeyron equilibrium relation is used to determine the vapor mass fraction and subsequently the evaporation mass flux at the interface. The numerical method is very robust and second order accurate. Extensive simulations have been performed for a wide range of flow conditions relevant to spray combustion. Main finding is that the exiting evaporation models perform reasonably well on the leading edge of a nearly spherical droplet but yield qualitatively wrong evaporation flux on the back of the droplet i.e., after the separation point. Stefan flow thickens the boundary layer and results in an early separation, which further deteriorates performance of the exiting evaporation models. Droplet deformation also plays a critical role.

Short Bio:
Dr. Muradoglu is a professor of Mechanical Engineering at Koc University. He received his BS degree in Aeronautical Engineering from Istanbul Technical University (ITU) in 1992, and MS and PhD degrees both from Cornell University in 1997 and 2000, respectively. He also worked as a postdoc at Cornell for about 18 months before joining the Koc University faculty in 2001. He has had visiting positions at Harvard, Notre Dame, Princeton Universities (USA), Aalto University (Finland) and ENSAM (France), and the Max-Planck Institute for Intelligent Systems (Germany). Dr. Muradoglu’s work has been recognized by multiple awards including the Turkish Academy of Sciences outstanding young scientist award (2009) and the Scientific and Technological Research Council of Turkey (TUBITAK) encouragement award (2010). He is elected fellow of The American Society of Mechanical Engineers (ASME) (2023) and an elected member of Science Academy, Istanbul, Turkey.

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