İçerisinde Dik Bölmeler Bulunan Trapez bir Kanalda Bölme Yüksekliğinin Akış ve Isı Transferine Etkisinin İncelenmesi

Bu çalışmada, üst duvarında dik bölmeler bulunan, alt duvarı trapez şeklinde dalgalandırılmış bir kanalda farklı bölme yüksekliğinin akış ve ısı transferine etkileri nanoakışkan ve taban akışkan akışı için sayısal olarak incelenmiştir. Nanoakışkan olarak TiO2 nanopartiküllerin su içerisinde süspansiyonu kullanılmış ve nanopartikül hacim oranı, φ=%1 sabit tutulmuştur. Sayısal çalışma, Hesaplamalı Akışkanlar Dinamiği (HAD) tabanlı FLUENT 15.0 programı ile iki boyutlu gerçekleştirilmiştir. Kanalın bölmeler içeren üst yüzeyinin adyabatik olduğu kabul edilmiş ve alt trapez yüzeyi Tw=360K sabit sıcaklıkta korunmuştur. İki farklı bölme yüksekliği (t=H/2 ve t=2H/3) kullanılarak farklı Reynolds sayıları (200≤Re≤1200) için nanoakışkanın ve taban akışkanın Nusselt sayısı (Nu), sürtünme faktörü (f) ve termo-hidrolik performansı (THP) hesaplanmıştır, ayrıca çalışma bölmelerin olmadığı kanal akışı ile de karşılaştırılmıştır. Kanal içerisinde farklı parametrelerde hız ve sıcaklık görüntüleri elde edilmiştir. Sayısal sonuçlar, trapez bir kanalda bölmelerin yüksekliğine ve nanoakışkana bağlı olarak ısı transferinin önemli ölçüde iyileştiğini, ancak sürtünmenin de bir miktar arttığını göstermiştir. En yüksek termo-hidrolik performans, bölmesiz kanalda taban akışkana göre, TiO2-su nanoakışkan akışında Re=400 ve t=2H/3 bölme yüksekliğinde 1,95 olarak elde edilmiştir.

Investigation of Effects of Baffle Heights on Flow and Heat Transfer in a Trapezoidal Channel with Vertical Baffles

In this study, the effects of baffle heights on the flow and heat transfer in a trapezoidal channel with vertical baffles on the upper wall and trapezoidal shaped the lower wall were numerically investigated for nanofluid and base fluid. The suspension of TiO2 nanoparticles in water was used as nanofluid and the particle volume fraction was kept constant at φ = 1%. Numerical study was realized with Computational Fluid Dynamics (CFD) based FLUENT 15.0 program. The upper surface of the channel was adiabatic and the lower trapezoidal surface was kept at a constant temperature (Tw = 360K). Nusselt number (Nu), friction factor (f) and thermo-hydraulic performance (THP) of nanofluid and base fluid were calculated for 200 ≤ Re ≤ 1200 Reynolds numbers using two different baffle heights (t = H/2 and t = 2H/3) and also the study was compared to channel flow without baffles. The velocity and temperature contours were obtained in different parameters in the channel. The numerical results showed that in a trapezoidal channel, the heat transfer improved significantly depending on the height of the baffles and nanofluid, but the friction also increased slightly. The highest THP was obtained as 1.95 in the TiO2-su nanofluid flow at Re = 400 and t = 2H/3 baffle height in the channel without baffles according to the base fluid.

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