Contact angle and droplet heat transfer during evaporation on structured and smooth surfaces of heated wall

S. Y. Misyura

Результат исследований: Материалы для журналаСтатья

44 Цитирования (Scopus)

Аннотация

Water evaporation in a wide range of droplet diameters and wall temperatures on the structured and smooth surfaces were studied experimentally. Linear dependence of evaporation rate (dV/dt) on a droplet radius varies when the volume is greater than 40–60 μl. The static contact angles on the structured surface vary with a droplet diameter for high wall superheating. Dependence of the contact angle on diameter for the corrugated surface is defined by a change in both potential energy barrier U and three-phase contact line tension τ cl . This energy barrier for the structured wall changes with an increase in the initial droplet diameter and becomes constant for the large droplets. For high wall superheating, the power in the law of evaporation increases from 1 to 1.45 with an increase in the initial droplet diameter. Depending on the droplet radius, number of droplets and heater length, four different characters of evaporation are realized. Complete droplet evaporation time on structured surface is less than smooth wall. Heat transfer coefficient is greater for structured wall than smooth one. When simulating droplet evaporation and heat transfer, it is necessary to take into account free convection of air and vapor.

Язык оригиналаАнглийский
Страницы (с-по)188-196
Число страниц9
ЖурналApplied Surface Science
Том414
DOI
СостояниеОпубликовано - 31 авг 2017
Опубликовано для внешнего пользованияДа

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ASJC Scopus subject areas

  • Surfaces, Coatings and Films

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