بررسی تجربی اثرات موئینگی در دینامیک تبخیر سطحی قطرات آب

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه لرستان

2 دانشگاه فردوسی مشهد

چکیده

تبخیر سطحی قطرات آب بر روی سطح جامد دارای کاربردهای فراوانی می باشد که از موارد فنی نظیر چاپ جوهرافشان، سرمایش از طریق پاشش و انواع پوشش دهی گرفته تا کاربردهای بیولوژیکی و ژئوفیزیکی را شامل می شود. در این تحقیق، رفتار سطوح شیشه، پلکسی گلاس، آلومینیم و مس در تبخیر سطحی قطرات آب به‌صورت تجربی مورد بررسی قرار می گیرد. فرض شده است که تبخیر قطره صرفاً ناشی از نفوذ جرم بخار آب از سطح قطره به محیط صورت پذیرد و از اثرات دیگر صرف‌نظر می شود. مشاهدات تجربی نشان می‌دهد که تبخیر سطحی برای سطوح آلومینیم و مس عموماً در سطح تماس ثابت صورت می گیرد و این در حالیست که قطره‌ی آب بر سطوح شیشه و پلکسی گلاس معمولاً در بازه های زمانی مشخصی رفتار لغزشی را نیز تجربه می کند. تغییرات انرژی سطحی ضمن تبخیر سطحی قطره بر روی سطح از دیگر موارد مورد بررسی در این تحقیق است.

کلیدواژه‌ها

عنوان مقاله [English]

Experimental Study of Capillary Effects on the Dynamics of Surface Evaporation of Water Droplets

نویسندگان [English]

  • A. Karimdoost Yasuri 1
  • M. Passandideh-Fard 2
1
2
چکیده [English]

The evaporation of liquid droplets is of fundamental importance in a large number of practical situations ranging from technological applications such as ink-jet printing, spray cooling and various coating processes, to a variety of biological and geophysical contexts. In this study, the behavior of the surfaces of Glass, Plexiglas, Aluminum and Copper in the evaporation of water droplets is studied experimentally. It is assumed that the transport of vapour in the atmosphere is dominated by diffusion and other effects are ignored. Experimental observations show that the surface evaporation on the surfaces of Aluminum and Copper are generally carried out in a constant contact area while the water droplets on the surfaces of Glass and Plexiglas usually experience the sliding behavior in certain timescales. Furthermore the changes of surface energy during the process of evaporation of water droplets on the surface are also discussed.

کلیدواژه‌ها [English]

  • surface evaporation
  • droplet contact angle
  • surface energy

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