Multiscale modeling of microdroplet evaporation and single pulse spray cooling
Year: 2025
Type: article
Abstract: This work provides a multiscale model for accurate descriptions of the heat and mass transport during single microdroplet evaporation and single pulse spray cooling on a heated semi-infinite solid. The temperature drop from a high-pressure spray pulse is captured through thermocouples and an infrared camera for initial substrate temperatures ranging from negative to positive superheats. A representative average diameter is estimated using high-speed cameras and the droplet size distribution statistics. The model can correctly predict the wall heat flux and evaporation rates from room temperature to positive superheats up to 10 K. At superheats beyond 20 K the model breaks down due to presumably boiling and microlayer evaporation effects. The results highlight the validity of coupling lubrication theory with kinetically-limited and diffusion-limited evaporation over a wide range of temperatures, using the vapor temperature and vapor pressure as the key mediating properties for bridging the molecular-scale forces with continuum-scale thermal physics.
Source: Fluid Dynamics Research
Authors: Fernando Soria, Edward Woodruff, Andrew G Fordon, Yunjun Xu, Shawn A Putnam
Institution: University of Central Florida
Language: English
Subfield: Computational Mechanics
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,325
Funder: National Science Foundation
OpenAlex ID: W4408605440