Hareketli Bir Plakadan Olan Isı Transferinin faklı Nanoakışkanlar ve Çarpan Jetle İncelenmesi

Year 2022, Volume: 14 Issue: 1, 115 - 127, 31.01.2022

Mustafa Kılıç , Mine Efeoğlu

https://doi.org/10.29137/umagd.958557

Abstract

Bu çalışmada, nanoakışkanların çarpan akışkan jet tekniği ile oluşturduğu müşterek etkinin, yüksek ısı akılı hareketli bakır bir plakadan olan ısı transferine etkisi sayısal olarak incelenmiştir. Çalışmanın ilk aşamasında, literatürdeki mevcut çalışmaları doğrulamak amacıyla temel akışkan olarak Cu-H2O nanoakışkanın hareketsiz bir plakada farklı Reynolds sayılarında ısı transfer analizi yapılmıştır. Model sonuçları literatürdeki mevcut deneysel çalışmalarla karşılaştırılmış ve doğrulanmıştır. İkinci aşamasında ise, hem hareketli hem de hareketsiz bir plakada Al2O3-H2O nanoakışkanı kullanılarak farklı parçacık çaplarında, farklı plaka hızlarında, ısı transfer analizi yapılmıştır. Ayrıca hareketli bakır plakada farklı tip nanoakışkan kullanılması durumunda ısı transferine olan etki de incelenmiştir. Sayısal çalışmada PHOENICS HAD programınn düşük Re sayılı k-ε türbülans modeli kullanılmıştır. Sonuç olarak; nanoparçaçık çapı Dp=40nm’den 10nm’ye azaltıldığında ortalama Nusselt sayısında %9,1’lik artış sağlandığı tespit edilmiştir. Plaka hızı Vplaka=0-6 m/s aralığında arttırıldığında ortalama Nusselt sayısında %88,9 oranında artış sağlandığı, farklı nanoakışkanların karşılaştırılması durumunda ise, en iyi ısı transfer performansının Cu-H2O nanoakışkanın gösterdiği belirlenmiştir.

Keywords

Çarpan akışkan jet, Hareketli plaka, HAD, Isı transferi, Nanoakışkan

Heat Transfer Analysis of a Moving Plate with different Nanofluids and Impining Jet

Abstract

In this study, the common effect of impinging fluid jet technique of nanofluids on heat transfer from a high heat flux moving copper plate was examined numerically. In the first phase of the study, heat transfer was analyzed for the basic fluid Cu-H2O nanofluids in different Reynolds numbers on a stationary plate to confirm the current studies in the literature. The model results were compared and verified with existing experimental studies in the literature. In the second phase, heat transfer analysis was performed at different particle diameters, different plate velocity, and different volume ratios using Al2O3-H2O nanofluid on both a moving and stationary plate. Furthermore, the effect of heat transfer was examined in the case of using different types of nanofluids in the moving copper plate. In the numerical study, the low Re numbered k-ε turbulence model of PHOENICS CFD program was used. According to the results of the study, if the nanoparticle diameter is reduced from Dp=40 nm to 10 nm, average Nusselt number increases of 9.1%. When the plate velocity was increased in the range of Vplate=0-6 m/s, average Nusselt number increases of 88.9%. In case of comparing different nanofluids it is obtained that the best heat transfer performance was determined by Cu-H2O nanofluid.

Keywords

Impinging fluid jet, Moving plate,, CFD, Heat transfer, Nanofluid.

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