A model for droplet heating and evaporation of water-in-oil emulsified fuel

Shen, Shiquan; Che, Zhizhao; Wang, Tianyou; Yue, Zongyu; Sun, Kai; Som, Sibendu

doi:10.1016/j.fuel.2019.116710

A model for droplet heating and evaporation of water-in-oil emulsified fuel

Journal Article · Wed Apr 15 04:00:00 EDT 2020 · Fuel

DOI:https://doi.org/10.1016/j.fuel.2019.116710· OSTI ID:1632166

Shen, Shiquan; Che, Zhizhao; Wang, Tianyou; Yue, Zongyu; Sun, Kai; Som, Sibendu

Water-in-oil (W/O) emulsified fuel is a promising alternative fuel by inducing flash boiling of water at high temperature that can improve the atomization of fuel spray. The heating and evaporation process of emulsified fuel droplet is affected by the diffusion and coalescence of small dispersed water droplets in oil during the heating. In this study, a model is developed for the droplet heating and evaporation of W/O emulsified fuel with these key physics considered. The diffusivity of dispersed water droplets in oil is calculated using the Stokes-Einstein equation. The deactivation temperature of surfactant is selected as a criterion for the water coalescence since the water coalescence is due to the deactivation of surfactant. The process of water coalescence is simplified that the dispersed water droplets coalesce into one single water sub-droplet at the center of the oil droplet instantly as the droplet temperature reaches the deactivation temperature of surfactant. The model is validated against experimental data of single droplet under different heating temperatures, surfactant concentrations, and sizes of dispersed water droplets. Based on the proposed model, the effects of fuel properties and heating conditions on the droplet heating and evaporation are analyzed.

Research Organization:: Argonne National Laboratory (ANL)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE) - Office of Vehicle Technologies (VTO)

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1632166

Journal Information:: Fuel, Journal Name: Fuel Vol. 266; ISSN 0016-2361

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

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