### Abstract

Original language | English |
---|---|

Pages (from-to) | 815-821 |

Number of pages | 7 |

Journal | International Journal of Heat and Mass Transfer |

Volume | 131 |

DOIs | |

Publication status | Published - 28 Mar 2019 |

### Fingerprint

### Keywords

- micro-explosions
- n-dodecane
- droplets
- pung
- heat conduction equation
- Heat conduction equation
- Droplets
- Puffing
- n-Dodecane
- Micro-explosions

### Cite this

*International Journal of Heat and Mass Transfer*,

*131*, 815-821. https://doi.org/10.1016/j.ijheatmasstransfer.2018.11.065

}

*International Journal of Heat and Mass Transfer*, vol. 131, pp. 815-821. https://doi.org/10.1016/j.ijheatmasstransfer.2018.11.065

**A simple model for puffing/micro-explosions in water-fuel emulsion droplets.** / Sazhin, Sergei; Rybdylova, Oyuna; Crua, Cyril; Heikal, Morgan; Ismael, M.; Nissar, Z.; Aziz, Rashid.

Research output: Contribution to journal › Article

TY - JOUR

T1 - A simple model for puffing/micro-explosions in water-fuel emulsion droplets

AU - Sazhin, Sergei

AU - Rybdylova, Oyuna

AU - Crua, Cyril

AU - Heikal, Morgan

AU - Ismael, M.

AU - Nissar, Z.

AU - Aziz, Rashid

PY - 2019/3/28

Y1 - 2019/3/28

N2 - A new simple model for the puffing/micro-explosion of water-fuel emulsion droplets is suggested. The model is based on the assumption that a spherical water sub-droplet is located in the centre of a larger fuel droplet. The fuel is approximated by n-dodecane. 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 micro-explosion. This time is referred to as the time to puffing, or micro-explosion 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.

AB - A new simple model for the puffing/micro-explosion of water-fuel emulsion droplets is suggested. The model is based on the assumption that a spherical water sub-droplet is located in the centre of a larger fuel droplet. The fuel is approximated by n-dodecane. 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 micro-explosion. This time is referred to as the time to puffing, or micro-explosion 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.

KW - micro-explosions

KW - n-dodecane

KW - droplets

KW - pung

KW - heat conduction equation

KW - Heat conduction equation

KW - Droplets

KW - Puffing

KW - n-Dodecane

KW - Micro-explosions

UR - http://www.scopus.com/inward/record.url?scp=85057240802&partnerID=8YFLogxK

U2 - 10.1016/j.ijheatmasstransfer.2018.11.065

DO - 10.1016/j.ijheatmasstransfer.2018.11.065

M3 - Article

VL - 131

SP - 815

EP - 821

JO - International Journal of Heat and Mass Transfer

JF - International Journal of Heat and Mass Transfer

SN - 0017-9310

ER -