Spread and rebound of liquid droplets upon impact on flat surfaces

AICHE Journal - Tập 43 Số 9 - Trang 2169-2179 - 1997
Ted Mao1, Dietmar Kühn1, Honghi Tran1
1Pulp & Paper Centre, Dept. of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College St., Toronto, M5S 1A4, Canada

Tóm tắt

AbstractThe spread and rebound of droplets upon impact on flat surfaces at room temperature were studied over a wide range of impact velocities (0.5–6 m/s), viscosities (1–100 mPa.s), static contact angles (30–120°), droplet sizes (1.5–3.5 mm), and surface roughnesses using a fast‐shutter‐speed CCD camera. The maximum spread of a droplet upon impact depended strongly on the liquid viscosity and the impact velocity. The tendency of a droplet to deposit or to rebound is determined primarily by the liquid viscosity and the liquid/substrate static contact angle. A model more broadly applicable than existing models was developed to predict maximum spread as a function of the Reynolds number, the Weber number, and the static contact angle. Based on the conservation of energy, a rebound model is proposed that predicts the tendency to rebound as a function of maximum spread and static contact angle.The maximum‐spread model prediction agrees to within 10% with more than 90% of the experimental data from different sources. In the current study, the rebound model successfully predicts the tendency of a droplet to rebound.

Từ khóa


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AICHE Journal

Tập 43 Số 9

2169-2179

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