NANOAKIŞKANLARIN ISIL İLETKENLİK VE VİSKOZİTESİNİN DENEYSEL İNCELENMESİ: TANECİK BOYUTU ETKİSİ

Alpaslan Turgut, Şahika Sağlanmak, Serkan Doğanay
1.348 345

Öz


Yeni nesil ısı transfer akışkanı olma potansiyeli taşıyan nanoakışkanlar ile ilgili araştırmalar on yılı aşkın bir süre önce başlamasına rağmen, yayınlanan çalışmaların sonuçları arasında birçok tutarsızlık ve çelişkiler mevcuttur. Bunlardan birisi tanecik boyutunun nanoakışkanın ısıl performansına olan etkisidir. Bu çalışmada, 10 nm ve 30 nm tanecik boyutuna sahip Al2O3-su nanoakışkanların, hacimce  % 1, 2, 3 ve 6,33 katkı oranlarında,  ısıl iletkenlik ve viskozite değerleri deneysel olarak belirlenmiş ve elde edilen sonuçlar literatürde yer alan efektif ısıl iletkenlik ve efektif viskozite modelleri ile karşılaştırılmıştır. Isıl iletkenliğin, tanecik boyutu ile ilişkili olmadığı ve deneysel sonuçlarımızın klasik efektif ısıl iletkenlik modellerinden biri olan Maxwell ile uyumlu olduğu gözlenmiştir. Reolojik ölçümler sonucunda, numunelerin Newton tipi akışkan davranışı gösterdikleri ve aynı tanecik katkı oranında, daha büyük tanecik boyutuna sahip numunelerin viskozitelerindeki artış oranının daha yüksek olduğu sonucuna varılmıştır. Klasik efektif viskozite modellerinden Einstein modeli, deneysel sonuçlarımız ile karşılaştırıldığında çok düşük değerlere sahiptir.

Anahtar kelimeler


Nanoakışkan; Isıl İletkenlik; Viskozite; Tanecik Boyutu Etkisi

Tam metin:

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DOI: http://dx.doi.org/10.17341/gummfd.25469

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