Süperhidrofobik ve hidrofobik yüzeyler üzerinde sıvı damlası gaz kabarcığı ve sıvı jeti dinamiğinin incelenmesi

Year 2016, Volume: 22 Issue: 7, 613 - 619, 21.12.2016

Ali Kibar

Abstract

Bu çalışmada, hidrofobik
ve süperhidrofobik yüzeylerin hidrofilik yüzeylerden farklılıkları ve bu
yüzeyler üzerinde sıvı damlası, gaz kabarcığı ve sıvı jeti dinamiği
incelenmiştir. Hidrofobik yüzeyler üzerinde sıvı/su damlası yüksek temas açısı
ile durmasına karşılık gaz/hava kabarcığı yüzeyde yayılmaktadır.
Süperhidrofobik yüzeyler için Cassie ve Wenzel olmak iki farklı durum
mevcuttur. Her iki durumda da yüzeyin temas açısı yüksek olmasına karşılık
Cassie durumda temas açısı histerezisi düşük Wenzel durumda ise yüksek
olmaktadır. Cassie durum süperhidrofobik yüzeyler üzerindeki sıvı damlası
yüzeyle çok az noktalardan temas etmesi sayesinde küçük bir dış kuvvet
etkisiyle yüzeyden uzaklaştırılabilmektedir. Süperhidrofobik yüzeyler sıvı
içerisine daldırıldıklarında etrafı ince bir hava filmi ile kaplanmaktadır. Bu
şekildeki yüzeye alttan gönderilen hava kabarcığı yüzeydeki hava filmine nüfuz
ederek kaybolmaktadır. Yüzey üzerindeki kabarcık ise yüzeyde yayılmaktadır.
Süperhidrofobik yüzeyler donma/buzlanmasının önlenmesi, film/damla yoğuşmanın
kontrolü, kaynamada oluşan hava kabarcık dinamiğinin kontrolü gibi birçok
alanlarda uygulama alanları bulunmaktadır.

Keywords

Süperhidrofobik yüzey, Temas açısı, Temas açısı histerezisi, Sıvı jeti, Sıvı damlası, Gaz kabarcığı

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