Impact of high-speed diesel drop trains: Pursuing cleaner diesel engines

This paper is associated with a video winner of a 2020 American Physical Society's Division of Fluid Dynamics (DFD) Milton van Dyke Award for work presented at the DFD Gallery of Fluid Motion. The original video is available online at the Gallery of Fluid Motion, https://doi.org/10.1103/APS.DFD.2020.GFM.V0052.

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Figure 1

Simulation of a diesel drop train impacting a liquid film showing important parameters (drop diameter $D$, drop spacing $S$, and impact velocity $V_0$) and the camera rotation used to generate the images in Fig. 2.

Figure 2

High-resolution ($\mathrm{\Delta }x=0.0375\mu \text{m}$) simulation results of a diesel drop train impacting a preexisting liquid film. Four passive scalars are used to track each impinging drop with a repeating color scheme of clear, red, yellow, and green. Three distinct phases of secondary droplet formation are identified in the images.