Abstract
A new simple model for the puffing/microexplosion of waterfuel emulsion droplets is suggested. The model is based on the assumption that a spherical water subdroplet is located in the centre of a larger fuel droplet. The fuel is approximated by ndodecane. The fuel droplet surface temperature is assumed to be fixed, and fuel evaporation is ignored. The heat conduction equation is solved inside this composite droplet with the Dirichlet boundary condition at the surface of the fuel droplet. The time instant when the temperature at the interface between water and fuel reaches the boiling temperature of water is associated with the start of the puffing process leading to microexplosion. This time is referred to as the time to puffing, or microexplosion delay time. When the fuel surface temperature is equal to the boiling temperature of fuel then this time is expected to be the shortest of the possible times. The predictions of the model are shown to be in agreement with available experimental data. The model predicts an increase in this time with increase in the fuel droplet size for fixed water and fuel mass fractions, in agreement with observations.
Original language  English 

Pages (fromto)  815821 
Number of pages  7 
Journal  International Journal of Heat and Mass Transfer 
Volume  131 
DOIs  
Publication status  Published  28 Nov 2018 
Keywords
 microexplosions
 ndodecane
 droplets
 pung
 heat conduction equation
 Heat conduction equation
 Droplets
 Puffing
 nDodecane
 Microexplosions
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Profiles

Cyril Crua
 School of Computing, Engineering & Maths  Professor of Engineering
 Advanced Engineering Centre
 Centre for Regenerative Medicine and Devices
Person: Academic

Oyuna Rybdylova
 School of Computing, Engineering & Maths  Principal Lecturer
 Advanced Engineering Centre
Person: Academic

Sergei Sazhin
 School of Computing, Engineering & Maths  Professor of Thermal Physics
 Advanced Engineering Centre
Person: Academic