Distribution of thermal energy of child-droplets issued from an optimal micro-explosion
Artikel i vetenskaplig tidskrift, 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

Emulsified fuel

Micro-explosion

Emulsions

Författare

D. Tarlet

Ernesto Mura

Industriella energisystem och -tekniker

C. Josset

J. Bellettre

C. Allouis

P. Massoli

International Journal of Heat and Mass Transfer

0017-9310 (ISSN)

Vol. 77 1043-1054

Ämneskategorier

Energiteknik

DOI

10.1016/j.ijfiheatmasstransfer.2014.06.054