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Effect of Surface Temperature on Fuel Drop Splashing on Solid Surfaces

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Proceedings of the National Aerospace Propulsion Conference

Part of the book series: Lecture Notes in Mechanical Engineering ((LNME))

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Abstract

Interaction of hydrocarbon fuel drops with high-temperature substrates is commonly encountered in combustion chambers, and such dynamics are relevant in design and optimization of fuel spray systems. Dynamics of fuel drops impacting on a heated solid surface in the splashing regime is investigated through high-speed imaging experiments. The effect of surface temperature in altering the impacting drop morphology and quantitative trends in splashing is studied in detail. The variation of splash behavior of drops impacting at three distinct drop Weber number (We) at different surface temperatures (TS) is considered. For a fixed We, an increase in the surface temperature causes a shift in the impact dynamics from splashing to spreading, which indicates higher threshold We at higher TS. The dynamics of the ejected liquid sheet and the spreading lamella post-impact are analyzed from the high-speed images to quantify the observed transitions.

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Abbreviations

C G :

Speed of sound in gas (m/s)

D 0 :

Initial diameter of impacting drop (mm)

g :

Acceleration due to gravity (m/s2)

H :

Impact height of drops (mm)

H t :

Initial height of lamella (mm)

k B :

Boltzmann’s constant (kg m2 K−1 s−2)

K l :

Constant multiplying lubrication force term

K u :

Constant multiplying suction force term

Oh :

Ohnesorge number

P :

Ambient gas pressure (Pa)

Re :

Reynold’s number

T :

Temperature of gas phase (°C)

T S :

Surface temperature (°C)

T S , tr :

Transition surface temperature (°C)

t :

Time elapsed from the instant of impact (s)

t e , cr :

Dimensionless critical sheet ejection time

V :

Drop impact velocity (m/s)

V e :

Expansion velocity of liquid lamella (m/s)

V t :

Initial velocity of liquid lamella (m/s)

We :

Weber number

α :

Re-contact factor

β :

Splash threshold parameter

γ :

Ratio of specific heats

μ :

Dynamic viscosity of drop liquid (Pa s)

μ G :

Dynamic viscosity of gas (Pa s)

ν L :

Kinematic viscosity of drop liquid (m2/s)

ρ :

Density of drop liquid (kg/m3)

ρ G :

Density of gas (kg/m3)

σ :

Surface tension of drop liquid (N/m)

ΣG:

Destabilizing stress exerted by gas (Pa)

ΣL:

Stabilizing stress of surface tension (Pa)

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Acknowledgements

This work was carried out with the support of National Center for Combustion Research and Development (NCCRD), Indian Institute of Science, India.

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Authors and Affiliations

  1. Department of Aerospace Engineering, Indian Institute of Science, Bengaluru, 560012, India

    Akshay Sreenivasan & Sivakumar Deivandren

Authors
  1. Akshay Sreenivasan
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  2. Sivakumar Deivandren
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Corresponding author

Correspondence to Akshay Sreenivasan .

Editor information

Editors and Affiliations

  1. Combustion Group, Gas Turbine Research Establishment, Defence Research and Development Organisation, Bengaluru, Karnataka, India

    Gullapalli Sivaramakrishna

  2. Gas Turbine Research Establishment, Defence Research and Development Organisation, Bengaluru, Karnataka, India

    S. Kishore Kumar

  3. Department of Aerospace Engineering, Indian Institute of Science, Bengaluru, Karnataka, India

    B. N. Raghunandan

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© 2023 The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

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Sreenivasan, A., Deivandren, S. (2023). Effect of Surface Temperature on Fuel Drop Splashing on Solid Surfaces. In: Sivaramakrishna, G., Kishore Kumar, S., Raghunandan, B.N. (eds) Proceedings of the National Aerospace Propulsion Conference. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-19-2378-4_32

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  • DOI: https://doi.org/10.1007/978-981-19-2378-4_32

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  • Publisher Name: Springer, Singapore

  • Print ISBN: 978-981-19-2377-7

  • Online ISBN: 978-981-19-2378-4

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