Demir Bazlı Nano-Sıvının Tek-Faz ve Havuz Kaynama Isı Transferi Şartlarında Ekserji Analizi

Yıl 2020, Cilt: 32 Sayı: 2, 197 - 205, 30.06.2020

Mehmed Rafet Özdemir

https://doi.org/10.7240/jeps.659332

Öz

Son yıllarda termal-sıvı uygulamaları artan ısı akısını karşılamak için en sık kullanılan yöntemlerden biri olmaya başlamıştır. Bu uygulamalardan en popüler olanlarından biri sıvıya nano-parçacık karıştırarak ısı transfer hızını arttırmaya çalışmaktır. Teoride kabul gören bu yöntem için farklı araştırma gruplarından farklı sonuçlar gelmekle birlikte kesin bir yargıya henüz tam olarak ulaşıldığı söylenemez. Sıvıya nano-parçacık eklemenin en zorlu yanı, birçok çalışmada belirtildiği gibi nano-parçacıkların yüzey üzerinde kümelenmeye ve çökelmeye meyilli olması ve bu durumun olması halinde ısı transferine negatif etki yapmasıdır. Bu özelliklerinden ötürü nano-parçacıkların sistem üzerinde kararsız davranış oluşturduğu da bazı çalışmalarda rapor edilmiştir. Bu çalışmada ana sıvı olarak suya Fe3O4 nano-parçacıkları eklenen sistemin ekserji analizi yapılmıştır. Burada en önemli nokta, sistemin manyetik kuvvete maruz bırakılması olup bu sayede çökelme ve kümelenmeye fırsat verilmeyecek olmasıdır. Bu çalışmada literatürden farklı olarak sistemin tek-fazlı ve havuz kaynama ısı transferi şartlarındaki verimi ekserjetik verim (harcanabilir enerji verimi) üzerinden değerlendirilecektir. Sonuçlar saf su, su-Fe3O4 nano-sıvısı ve manyetik kuvvet altındaki su-Fe3O4 nano-sıvısı şeklinde sunulup ekserji yıkım oranları karşılaştırılmıştır.

Anahtar Kelimeler

nano-sıvı, ekserji analizi, havuz kaynama, tek-fazlı ısı transferi

Kaynakça

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