Although oil spray cooling is a promising cooling concept for electrical engines with high power density, there is a lack of universal measurement data and correlations for design purposes. In this article, an experiment is designed specifically for this application using similarity theory in a generic spray-wall situation. The comprehensive investigation shows a clear dependence of the heat transfer on the oil mass flow density and the droplet energy on impact into the oil film formed on the heated windings. Also, the thermal interaction between the spray droplets and the surrounding air is found to be an essential mechanism in oil spray cooling heat transfer. The experimental results are eventually used to derive a Nusselt number correlation...      «

Although oil spray cooling is a promising cooling concept for electrical engines with high power density, there is a lack of universal measurement data and correlations for design purposes. In this article, an experiment is designed specifically for this application using similarity theory in a generic spray-wall situation. The comprehensive investigation shows a clear dependence of the heat transfer on the oil mass flow density and the droplet energy on impact into the oil film formed on the he...     »