Abstract
The heat transfer of a single water droplet impacting on a heated hydrophobic surface is investigated numerically using a phase field method. The numerical results of the axisymmetric computations show good agreement with the dynamic spreading and subsequent bouncing of the drop observed in an experiment from literature. The influence of Weber number on heat transfer is studied by varying the drop impact velocity in the simulations. For large Weber numbers, good agreement with experimental values of the cooling effectiveness is obtained whereas for low Weber numbers no consistent trend can be identified in the simulations.
Highlights
Heat transfer on drop impact is important for various industrial applications such as spray cooling and fuel injection [1] or injection of urea-water solution sprays into automotive exhaust pipes for selective catalytic reduction [2].Various parameters such as drop diameter (d0), drop impact velocity (V0), gas-liquid surface tension (σ), surface topology and wettability determine the droplet behaviour after impact on the hot surface
The influence of Weber number on heat transfer is studied by varying the drop impact velocity in the simulations
It indicates the increase in drop impact velocity (W e number) in general increases the cooling effectiveness
Summary
- Controlling Inkjet Fluid Kinematics to Achieve SOFC Cathode Micropatterns Theresa. Y.
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