Nusselt and Sherwood correlations of multi-component hydrocarbon droplet in rotating natural convection

Abstract

The study focused on examining the effect of rotation and high temperatures on the evaporation of multiple components of hydrocarbon droplets in natural convection. It analyzed the Nusselt and Sherwood correlations associated with this phenomenon. The study demonstrates consistent and reliable agreement in both the qualitative and quantitative aspects. The correlations consider rotational phenomenon and enhance the transfers in the vapor phase of mixtures containing multiple components (Heptane, Octane and Decane). They are developed considering the variability of thermophysical and transport properties, as well as the evaporation phenomenon and the heat and mass transfers of the rotating multicomponent hydrocarbon liquid droplet. For a frequency varying between 5 s−1 and 40 s−1, and an ambient temperature varied from 150 °C to 400 °C, the average Nusselt & Sherwood correlations are determined for Prandtl and Schmidt numbers varying between 0.7 < Pr < 0.97, and 1.58 < Sc < 3.13 respectively. The rise of the droplet rotational velocity indicates an augmentation that favors the prevalence of the convection phenomenon over conduction, and elucidating that vapor diffusion due to rotational motion surpasses the significance of the convection phenomenon. the enhancement of Nusselt and Sherwood correlations through the incorporation of rotational motion contributes to the improvement of the evaporation process for hydrocarbon droplets in combustion engines.