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A study on the behavior and heat transfer characteristics of impinging sprays

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Abstract

The spray/wall interaction is considered as an important phenomenon influencing air-fuel mixing in the internal combustion engines. In order to adequately represent the spray/wall interaction process, impingement regimes and post-impingement behavior have been modeled using experimental data and conservation constraints. The modeled regimes were stick, rebound, spread and splash. The tangential velocities of splashing droplets were obtained using a theoretical relationship. The continuous phase was modeled using the Eulerian conservation equations, and the dispersed phase was calculated using a discrete droplet model. The numerical simulations were compared to experimental results for spray impingement normal to the wall. The predictions for the secondary droplet velocities and droplet sizes were in good agreement with the experimental data.

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Abbreviations

D :

Droplet diameter

f :

Frequency of the impinging droplet

h :

Height of splashing lamella

K :

Non-dimensional parameter (=Oh·Re 1.25 bn )

m :

Droplet mass

N :

Number of droplets in a parcel

Oh :

Ohnesorge number (=ρ d D b v bn /μ d )

Re:

Reynolds number (=μ d /ρ d σ d D b )

r c :

Radius of splashing lamella

r m :

Splashing mass ratio

v :

Velocity of droplet

We c :

Critical Weber number based on the incident droplet velocity

θ b :

Incident angle of impinging droplets measured from the wall

θ b :

Splashing angle of droplets measured from the wall

σ:

Surface tension of the droplet

ϕ:

Time fraction at which the splash occurs

ν:

Kinematic viscosity of the impinging droplet

a, b :

After and before impingement, respectively

n, t :

Normal and tangential, respectively

d, s :

Droplet and splashing, respectively

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  1. Division of Mechanical and Automotive Engineering, Yosu National University, 195 Kuk Dong, Yosu, 550-749, Chonnam, Korea

    Hei Cheon Yang & Sang Kyoo Park

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  1. Hei Cheon Yang
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  2. Sang Kyoo Park
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Correspondence to Hei Cheon Yang.

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Yang, H.C., Park, S.K. A study on the behavior and heat transfer characteristics of impinging sprays. KSME International Journal 15, 374–383 (2001). https://doi.org/10.1007/BF03185221

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  • DOI: https://doi.org/10.1007/BF03185221

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