کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
651079 1457397 2016 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The interaction of falling and sessile drops on a hydrophobic surface
ترجمه فارسی عنوان
تعامل قطرات در حال سقوط و بی پایه بر روی یک سطح آبگریز
کلمات کلیدی
تاثیر قطره مایع؛ گسترش؛ پس زدن
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی


• Concentric impacts of water drops on Teflon is characterized.
• Spreading diameter indicates increased energy dissipation at higher Weber numbers.
• Spreading diameter favorably compares with analytical predictions.

The dynamic behavior of drops impacting surfaces, liquid films or pools, and moving drops has been previously investigated; however, the behavior of falling drops impacting a sessile drop at rest has been explored to a lesser degree. In this work the coalescence, spreading, and recoil following the concentric impact between a falling water drop and a sessile water drop is studied on a Teflon substrate (hydrophobic). The influence of the Weber number, We, on drop spreading is the primary focus. For experiments at We ∼ 200, the impacts results in drops that spread a maximum diameter and then recoil to a final equilibrium diameter. At lower Weber numbers the drops spread to a maximum diameter, then recoil, and then undergo a second spreading event to the final equilibrium diameter. These observations suggest that at higher Weber numbers more energy is dissipated in the deformation of the liquid volume that occurs via crown formation, contact line movement, and spreading. Experimental observations are compared with analytical predictions based on conservation of energy with two treatments of energy dissipation. Analytical predictions for the maximum spread diameter are within 10% of measurement and indicate that approximately one half of the kinetic energy of the impacting drop is dissipated in the approach to maximum spreading diameter.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Experimental Thermal and Fluid Science - Volume 79, December 2016, Pages 36–43
نویسندگان
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