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Journals / Niğde Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi / 2026 / Cilt: 10 Sayı: 1

Numerical investigation of combined effect of nanofluid and impinging jet on heat transfer from a high heat flux moving surface

Yüksek ısı akılı hareketli bir plakadan olan ısı transferine nanoakışkanların ve çarpan jetlerin müşterek etkisinin sayısal incelenmesi

Mustafa Kılıç(Adana Alparslan Türkeş Bilim ve Teknoloji Üniversitesi)0000-0002-8006-149X
Murat Gökçek(NİĞDE ÖMER HALİSDEMİR ÜNİVERSİTESİ)0000-0002-7951-4236
Pages
373–379
Publication Date
2021-01-15
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

Additionally, numerical results were also verified with some experimental results in literature.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:Besides technological developments heat loads on industrial systems are also increasing.
📊
Key Findings & Data:So increasing rate of heat transfer to prevent demolition of the systems by high heat flux is a significant problem to solve.
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Conclusion & Impact:Additionally, numerical results were also verified with some experimental results in literature.
🔬Design:Modeling & Simulation
📍Scope:Comprehensive Sample
⚙️Variables:Çarpan jet · Hareketli plaka · Isı transferi

Abstract

Besides technological developments heat loads on industrial systems are also increasing. So increasing rate of heat transfer to prevent demolition of the systems by high heat flux is a significant problem to solve. In this study, enhancement of heat transfer from a moving high heat flux surface with nanofluids and impinging jets was studied numerically. Effects of different Reynolds number for different fluid velocities (Re=8000, 16000, 24000, 32000), different volume ratio of nanofluids (ϕ=0.5, 1.0, 1.5, 2.0), different particle diameter of nanofluids (Dp= 10, 20, 30, 40 nm) and different plate velocities (Vplate= 0, 0.5, 1, 2m/s) on heat transfer were investigated. Al2O3-H2O is used as a base fluid for all parameter. k-ε turbulence model of PHOENICS CFD program was used for numerical analysis. As a result; increasing Re number from Re=8000 to Re=32000 causes an increase of 54.9% on Nuavg, increasing nanofluid volume ratio from ϕ=0.5 to ϕ=2.0 causes an increase of 2.5% on Nuavg, decreasing nanofluid particle diameter from Dp=40 nm to Dp=10 nm causes an increase of 9.1% on Nuavg. It was also determined that increasing plate velocity causes an increase on Nuavg. This increase can be assigned at the region of fluid velocity and plate velocities were at the same direction according to the opposite direction. Increasing plate velocity from Vplate=0 m/s to Vplate=2 m/s causes and increase of 40.9% on Nuavg. Additionally, numerical results were also verified with some experimental results in literature.

Özet

Gelişen teknoloji endüstriyel cihazlar üzerindeki ısıl yükler gün geçtikçe arttırmaktadır. Bu ısıl yüklerin cihazlara vereceği tahribatı engellemek için ısı transferinin artırılması çözülmesi gereken önemli bir problem haline gelmiştir. Bu çalışmada; üzerinde yüksek ısı akısı olan hareketli bir plakadan olan ısı transferinin, nanoakışkanlar ve çarpan jet kullanılarak iyileştirilmesinin sayısal incelemesini hedeflemiştir. Farklı nanoakışkan giriş hızları için hesaplanan Reynolds sayılarının (Re=8000, 16000, 24000, 32000), farklı nanoakışkan hacim oranları (ϕ=0,5, 1,0, 1,5, 2,0), farklı nanoakışkan parçacık çaplarının (Dp= 10, 20, 30, 40 nm) ve farklı plaka hızlarının (Vplaka= 0, 0,5, 1, 2m/s) ısı transferine etkisi sayısal olarak çalışılmıştır. Tüm parametreler için temel akışkan olarak Al2O3-H2O nanoakışkanı kullanılmıştır. Sayısal çalışmada PHOENICS hesaplamalı akışkanlar dinamiği programının k-ε türbülans modeli kullanılmıştır. Çalışma sonucunda; Reynolds sayısı Re=8000-32000 aralığında arttırıldığında Nuort değerinde %54,9 artış olduğu tespit edilmiştir. Nanoakışkan hacimsel oranı ϕ=0,5-2,0 aralığında arttırıldığında ortalama Nusselt sayısında % 2,5’lik bir artış olduğu belirlenmiştir. Nanoakışkan parçacık çapı Dp= 40-10 nm aralığında azaltıldığında ortalama Nusselt sayısında % 9,1’lik bir artış meydana geldiği tespit edilmiştir. Farklı plaka hızlarında ise ortalama Nusselt sayısının genel olarak arttığı belirlenmiştir. Bu artışın; plaka hızı ve akışkan hızının ters yönde olduğu bölgede, aynı olduğu bölgeye göre daha belirgin bir şekilde ortaya çıktığı tespit edilmiştir. Vplaka= 0-2 m/s aralığında Nuort değerindeki artışın %40,9 olarak meydana geldiği belirlenmiştir. Ayrıca sayısal model sonuçları, literatürdeki deneysel sonuçlarla da doğrulanmıştır.

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Cite This Article

Kılıç, M., Gökçek, M. (2021). Numerical investigation of combined effect of nanofluid and impinging jet on heat transfer from a high heat flux moving surface. Niğde Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi, Cilt: 10 Sayı: 1, 373–379. https://doi.org/10.28948/ngumuh.748791

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