Distribution of thermal energy of child-droplets issued from an optimal micro-explosion
Journal article, 2014

The micro-explosion phenomenon is involved in emulsified fuel droplets placed in a hot atmosphere, such as spray combustion. Droplets of water-in-sunflower oil emulsion are used, since they are representative of a class of emulsions used in practical applications of biofuels. Once the micro-explosion is triggered after a short delay, the rapid (<= 1 ms) vaporization of the inside water droplets and the subsequent disintegration of the emulsion droplet blow the fragmented droplets away. These fragmented droplets are called "child-droplets", and they are too small and fast for an on-the-fly infra-red imaging thermal characterization. The present study focuses on the thermal reaction of a thin plate when impacted by them. Thorough and detailed tests are carried out, to make sure that the plate and the acquisition system are collecting a data that is actually representative of the child-droplets thermal energy. A quantitative post-processing is applied to the transient temperature field on the plate. It leads to the thermal energy of the whole plate, and of representative samples of individual child-droplets. The results show that their thermal energy is governed by a log-normal distribution.

Child-droplets

Micro-explosion

Emulsified fuel

Emulsions

Author

D. Tarlet

Université de Nantes

Ernesto Mura

Industrial Energy Systems and Technologies

C. Josset

Université de Nantes

J. Bellettre

Université de Nantes

C. Allouis

P. Massoli

International Journal of Heat and Mass Transfer

0017-9310 (ISSN)

Vol. 77 1043-1054

Subject Categories

Energy Engineering

DOI

10.1016/j.ijheatmasstransfer.2014.06.054

More information

Latest update

10/30/2019