A new approach to modelling micro-explosions in composite droplets

Sergei S. Sazhin, Tali Bar-Kohany, Zuhaib Nissar, Dmitrii Antonov, Pavel A. Strizhak, Oyuna D. Rybdylova

Результат исследований: Материалы для журналаСтатьярецензирование

3 Цитирования (Scopus)

Аннотация

A new approach to modelling puffing and micro-explosion in composite water/fuel droplets is proposed. This approach is based on the assumption previously made that a spherical water sub-droplet is located in the centre of a spherical fuel (n-dodecane) droplet. The heating of a fuel droplet is described by the heat conduction equation with the Robin boundary condition at its surface and continuity conditions at the fuel-water interface. The analytical solution to this equation, obtained at each time step, is incorporated into the numerical code and used for the analysis of droplet heating and evaporation. The effects of droplet thermal swelling are taken into account. The results of calculations using this code allowed us to obtain the time evolution of the temperature at the water/fuel interface and the evolution of time derivative of this temperature (T˙) with time in the same location. Using the original and previously published experimental data, two new correlations for the nucleation temperatures TN as functions of T˙, valid in the range 0≤T˙≤106 K/s, are suggested. Using these correlations and the values of T˙ inferred from the analysis, the time evolutions of the nucleation temperatures TN at the water-fuel interface are obtained. The predicted values of TN are compared with the values of temperature at this interface Tw. The time instant when Tw=TN is associated with the time instant when puffing/micro-explosion starts.

Язык оригиналаАнглийский
Номер статьи120238
ЖурналInternational Journal of Heat and Mass Transfer
Том161
DOI
СостояниеОпубликовано - ноя 2020

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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