The role of atomization in the coupling between doped droplets dynamics and their flames

Author:

Mosadegh Sepehr1ORCID,Kheirkhah Sina1ORCID

Affiliation:

1. School of Engineering, The University of British Columbia, Kelowna, British Columbia V1V 1V7, Canada

Abstract

The droplet and flame chemiluminescence dynamics and their coupling during atomization events of graphene oxide doped diesel are investigated experimentally. The tested doping concentrations are 0%, 0.001%, 0.005%, 0.01%, and 0.02% by weight. Small diameter fibers are used for the droplet suspension. Separate shadowgraphy and [Formula: see text] chemiluminescence measurements are performed at 4000 Hz to study the droplet and flame dynamics, respectively. The results show that both the droplet diameter squared and the flame chemiluminescence feature intermittent oscillations. The root mean square of the droplet diameter squared oscillations is positively related to the number and intensity of the atomization events and the graphene oxide doping concentration. The probability density function of the inverse of the time separation between two consecutive atomization events and the power spectrum density of the droplet diameter squared oscillations feature dominant large probabilities and powers at about 25 Hz prior to the occurrence of the first intense atomization event. After the occurrence of the first intense atomization event, this frequency decreases to about 5 Hz for both. Although the intense atomization triggers the large amplitude oscillations at 5 Hz, it was argued that the retracting motion of the igniter induces the oscillations at 25 Hz. Our findings suggest that the atomization events are the root cause of the smaller frequency coupling between liquid fuel droplets doped with graphene oxide and their flames. This has implications for spray combustion research.

Funder

Natural Sciences and Engineering Research Council of Canada

Publisher

AIP Publishing

Subject

Condensed Matter Physics,Fluid Flow and Transfer Processes,Mechanics of Materials,Computational Mechanics,Mechanical Engineering

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