نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه تبدیل انرژی، دانشکده مکانیک، دانشکدگان فنی، دانشگاه تهران
2 دانشکده مکانیک دانگشاه تهران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Line droplets are sessile droplets with finite length and width. The drops can be represented by assuming two spherical caps at each end and a rectangular part in the middle. This study examines the behavior of the contact line of line droplets with different shapes and aspect ratios as they evaporate. We suggest a new method using the different solid-gas interfacial tensions for dry vs. a previously wet substrate to determine the shape of the droplet during evaporation. The pinning of the contact line of line droplets leads to the outward evaporation-induced flow toward the contact line as previously described for spherical and infinite cylindrical droplets. During the evaporation of these droplets on a surface, it is observed that the contact line at the droplet ends recedes at higher contact angles than droplets with a circular footprint. Furthermore, we find the local evaporation rate at the surface of the droplet and study the internal flow generated as a result of evaporation. The outward flow velocity toward the ends along the droplet is higher compared to the flow velocity toward the sides.
کلیدواژهها [English]
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