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Measuring evaporation of micro-fuel droplets using magnified DIH and DPIV

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Abstract

This paper details the use of magnified digital in-line holography (MDIH) and digital particle image velocimetry (DPIV) to measure the evaporation rates of fuel micro-droplets undergoing heating. The technique can be used to measure instantaneous evaporation along an individual droplet trajectory, or if applied to a series of droplets, the average evaporation over a number of successive measurement locations. The advantage of this technique over traditional optical techniques is greater spatial resolution and depth of field for the high magnification factors used. An application of the technique to the evaporation measurement of diesel fuel droplets ranging from 10 to 90 μm is presented. Results reveal that similar to larger droplets, temperature plays the dominant role in evaporation processes, with little sensitivity to initial droplet size found for a peak reactor temperature of 660 K.

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Abbreviations

f :

Lens focal length

d f :

Distance of focus

x, y, z:

Co-ordinate system

u, v:

Velocity components in x and y directions

Δx, Δt :

Distance and time interval between two consecutive images

t :

Droplet residence time

M :

Magnification factor

D :

Droplet diameter

D o :

Droplet initial diameter

B u :

Velocity uncertainty limit

B x B t :

Displacement and timing uncertainty limits

K v :

Evaporation rate constant

T :

Reactor gas temperature

L :

Lens

L eff :

Effective lens

TC:

Teleconverter

IW:

Interrogation window

ROI:

Region of interest

DIH:

Digital in-line holography

MDIH:

Magnified digital in-line holography

DPIV:

Digital particle image velocimetry

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Acknowledgments

The authors would like to acknowledge the financial support of the Australian Research Council (ARC) for funding the facility. The first author is also grateful to the financial support of Monash University, Department of Mechanical and Aerospace Engineering.

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Authors and Affiliations

  1. Laboratory for Turbulence Research in Aerospace and Combustion, Department of Mechanical Engineering, Monash University, Clayton, VIC, 3800, Australia

    D. Nguyen, D. Honnery & J. Soria

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  1. D. Nguyen
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  2. D. Honnery
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  3. J. Soria
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Correspondence to D. Nguyen.

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Nguyen, D., Honnery, D. & Soria, J. Measuring evaporation of micro-fuel droplets using magnified DIH and DPIV. Exp Fluids 50, 949–959 (2011). https://doi.org/10.1007/s00348-010-0962-5

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  • DOI: https://doi.org/10.1007/s00348-010-0962-5

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