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Distribution of thermal energy of child-droplets issued from an optimal micro-explosion

D. Tarlet ; Ernesto Mura (Institutionen för energi och miljö, Värmeteknik och maskinlära) ; C. Josset ; J. Bellettre ; C. Allouis ; P. Massoli
International Journal of Heat and Mass Transfer (0017-9310). Vol. 77 (2014), p. 1043-1054.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Micro-explosion, Child-droplets, Emulsified fuel, Emulsions



Denna post skapades 2014-09-15.
CPL Pubid: 202730

 

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Institutioner (Chalmers)

Institutionen för energi och miljö, Värmeteknik och maskinlära (2005-2014)

Ämnesområden

Termisk energiteknik

Chalmers infrastruktur