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Droplet impingement on a hot surface whose temperature is above the saturation temperature of the fluid plays an important role in a variety of applications. These include, for example, coating processes, spray cooling processes of turbine blades, quenching during hardening of metals, cooling of metal rolling mills and lasers, and combustion processes in gasoline and diesel engines and the combustion chambers of turbines. When the surface temperature is below the so-called Leidenfrost temperature, the heat transfer from the wall to the droplet depends on the droplet hydrodynamics and on the local heat and mass transfer in the region of the three-phase contact line. According to numerical and experimental studies, heat transfer near the three-phase contact line plays a significant role in the overall heat transfer. This means that extreme local temperature gradients and heat flux densities occur in this region. Herein, the work focuses on studying the single droplet and multidimensional (vertical and horizontal) droplet coalescence of fluid on a heated surface. Fluids with the composition of single and binary mixtures are used. The effect of various parameters such as droplet diameter, impact velocity, system pressure, and surface heat flux density on spreading and heat transfer dynamics is carried out.

Subproject C2 of CRC TRR 75 “Droplet dynamics under extreme ambient conditions”

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