انتقال‌حرارت جابجايي؛ تشعشع؛ روش راستاهاي مجزا؛ ديواره طيفي

Experimental Study of the dynamics of droplet impact on the viscoelastic Substrate

درك اثرات موئينگي در تعامل قطره مايع با سطح در بسياري از فرآيندها از قبيل كاربردهاي صنعتي نظير چاپگرهاي جوهر افشان، ايجاد پوشش رنگها، پاشش سموم كشاورزي و غيره داراي اهميت بسياري است. تحقيق حاضر به بررسي تجربي برخورد قطره بر روي سطوح ويسكوالاستيك با ضخامت‌هاي مختلف مي‌پردازد. ارزيابي ديناميك قطره طي برخورد در محدوده‌اي از اعداد رينولدز بين 1000 تا 16000 و عدد وبر تا 2600 انجام شده است. نتايج تجربي نشان مي‌دهد كه اثر نرمي و ضخامت سطح بر روي مرحله ترشوندگي ناچيز است در حاليكه اين تأثير بر روي مرحله ناخيسش قطره، قابل توجه است.

Understanding the capillary effects of liquid droplet interaction with the surface in many industrial processes such as inkjet printers, painting, spraying pesticides, etc. is of critical importance.Droplet impact on substrates has long been a key and popular subject of experimental, numerical and theoretical studies to describe phenomena involved in both nature and many industrial applications.The interest of the droplet impact on viscoelastic surfaces especially is important in many common applications, ranging from pesticide delivery on leaves to spray cooling of flexible surfaces. This study examines the impact of a drop on viscoelastic substrates with various film thicknesses. Droplet dynamic measurements during the impact in the range of Reynolds numbers between 1000 and 16000 and the Weber number to 2600, including those examined in this study. Experimental results show that the effect of substrate softness and thickness is negligible in wetting phase while this effect is significant in dewetting phase