Cidarına Isıtıcı Yerleştirilmiş Kapalı Kutu İçindeki Su Bazlı Nanoakışkanların Laminer Doğal Taşınımla Isı Transferi

Year 2015, Volume: 15 Issue: 2, 1 - 12, 30.08.2015

Zerrin Sert , Çisil Timuralp

https://doi.org/10.5578/fmbd.9381

Cited By: 1

Abstract

Bu çalışmada, dik kenarlardan biri soğutulurken diğeri ısıtılan, alt ve üst kenarları yalıtılmış, bir kare kutu
ele alınmıştır. Kapalı kare kutunun içi, tek faz olarak ele alınan su bazlı nanoakışkan ile doludur.
Nanopartikül olarak Cu, Al2O3 ve TiO2 seçilmiştir. Çalışmada katı partiküllerin hacim fraksiyonunun
0.0 ≤ ߮ ≤ 0.2 aralığındaki değerleri göz önüne alınmıştır. Kare kutunun, sol dik kenardaki ısıtıcı
konumu, içindeki su bazlı nanoakışkan çeşidi ve katı hacim fraksiyonu değiştirilerek, sürekli rejimde
laminer doğal taşınım ile meydana gelen ısı geçişi sayısal olarak incelenmiştir. Sol dik kenarda iki farklı
parçalı ısıtıcı kullanımının ısı geçişine ve hava sirkülasyonuna etkisi araştırılmıştır. Bu esnada sisteme
giren ısı sabit tutulmuş, ısıtıcı ve soğuk duvar izotermal kabul edilmiştir. Yönetici denklemler; süreklilik,
yoğunluk farkı için Boussinesq yaklaşımının kullanıldığı Navier-Stokes denklemleri ve enerji denklemi
Fluent® yazılımı aracılığıyla çözülmüştür. Çözümde SIMPLE algoritması ve taşınım terimlerinin
ayrıklaştırılmasında ikinci mertebeden ayrıklaştırma seçeneği kullanılmıştır. Rayleigh sayısı 10
3 − 5 × 10 8 arasında değiştirilmiş, sürekli rejimde ısıtıcıdan ortama geçen ısının hesabının bir ölçüsü olarak
soğuk duvar yüzeyi üzerinden ortalama Nusselt sayısı hesaplanmıştır. Bu parametrik çalışma sonucunda
Rayleigh sayısı, ısıtıcıların konumu, seçilen su bazlı nanoakışkan çeşidi ve katı partiküllerin hacim
fraksiyonu değiştirilerek parametrik analizleri yapılmış, ısıtıcıların soğutulması açısından elde edilen
sayısal değerler, akım çizgileri ve eş sıcaklık eğrileri ile verilmiştir.

Keywords

Isı geçişinin iyileştirilmesi, Nanoakışkanlar, Kapalı kutu, Doğal taşınım, Ortalama nusselt sayısı

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