On numerical methods; optimization of CFD solution to evaluate fluid flow around a sample object at low Re numbers

Afshari, Faraz; Zavaragh, Hadi Ghasemi; Şahin, Bayram; Grifoni, Roberta Cocci; Corvaro, Francesco; Marchetti, Barbara; Polonara, Fabio

doi:10.1016/j.matcom.2018.04.004

Cited by 41 publications

(5 citation statements)

References 21 publications

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“…Moreover, a turbulent model should be used to analyze flow behavior inside the HEXs. In this research, k-ε model has been selected according to similar studies which investigated various HEXs (Karagoz et al , 2017; Afshari et al , 2018; Khanlari et al , 2019; Ozdemir and Ergun, 2019). Also, it is better to state that steady state condition has been selected in the simulation part.…”

Section: Methodsmentioning

confidence: 99%

Experimental and numerical analysis on using CuO-Al₂O₃/water hybrid nanofluid in a U-type tubular heat exchanger

Gürbüz

Variyenli

Sözen

et al. 2020

HFF

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Purpose Heat exchangers (HEXs) are extensively used in many applications such as heating and cooling systems. To increase the thermal performance of HEXs, nano-sized particles could be added to the base working fluid which can improve the thermophysical properties of the fluid. In addition, further improvement in the thermal performance of nanofluids can be obtained by using two or more different nanoparticles which are known as hybrid nanofluids. This paper aims to improve the thermal efficiency of U-type tubular HEX (THEX) by using CuO-Al2O3/water hybrid nanofluid. Design/methodology/approach Numerical simulation has been used to model THEX with various configurations. Also, CuO-Al2O3/water hybrid nanofluid has been experimented in THEX in two various modes including parallel (PTHEX) and counter flow (CTHEX) regarding to the numerical findings. Hybrid nanofluids have been prepared in two particle concentrations and compared with CuO/water nanofluid at the same concentrations and also with water. Findings The numerical simulation results showed that adding fins and also using hybrid nanofluid can increase heat transfer rate in HEX. However, adding fins cannot be a good option in U-type THEX with lower diameter because it increases pressure drop notably. Experimental results of this work illustrated that using Al2O3-CuO/water hybrid nanofluid in the THEX improved thermal performance significantly. Maximum enhancement in overall heat transfer coefficient of THEX by using CuO-Al2O3/water nanofluid in 0.5% and 1% concentrations achieved as 9.5% and 12%, respectively. Originality/value The obtained findings of the study showed the positive effects of using hybrid type nanofluid in comparison with single type nanofluid. In this study, numerical and experimental analysis have been conducted to investigate the effect of using hybrid type nanofluid in U-type HEX. The obtained results exhibited successful utilization of CuO-Al2O3/water hybrid type nanofluid in HEX. Moreover, it was observed that thermal performance analysis of the nanofluids without any experiment can be done by using numerical method.

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Section: Methodsmentioning

confidence: 99%

Experimental and numerical analysis on using CuO-Al₂O₃/water hybrid nanofluid in a U-type tubular heat exchanger

Gürbüz

Variyenli

Sözen

et al. 2020

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“…Alüminyum balpetekli soğurucu yüzeye sahip hava kollektörünün simülasyon çalışması, kütle akış hızı, güneş radyasyonu ve giriş hava sıcaklığı değiştirilerek, farklı giriş koşulları altında gerçekleştirilmiştir. HAD simülasyonunun doğruluğunun belirlenmesi için birçok araştırmacı tarafından doğrulanmış türbülans metotları kullanılmıştır [17], [18], [19]. Çalışmanın nihai amacı analizi yapılacak güneş hava kollektörünün ısı transferi performansını ve termal enerji kullanımını en üst seviyelere çıkaracak tasarım geliştirmek, farklı hava akış hızları altında kollektörün genel termal verimliliğini artırmak ve en yüksek verim elde etmek için optimum radyasyon ve hava akış hız değerlerini bulmaktır.…”

Section: Akış Koşulları Türbülans Ve Radyasyon Modelinin Seçilmesiunclassified

Alüminyum Balpeteği Soğurucu Yüzeye Sahip bir Güneş Hava Kollektörünün HAD Analizi

EYYUBLU¹,

Büker²

2022

European Journal of Science and Technology

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ÖzBu çalışmada, bir güneş hava kollektörü tasarımının hava çekiş yerine göre HAD (Hesaplamalı Akışkanlar Dinamiği) analizleri gerçekleştirilmiştir. Güneş hava kollektörünün verimini artırmak için balpeteği geometrisine sahip bir alüminyum soğurucu plaka kullanılmıştır. Isı transferi ve hava akış özelliklerini incelemek için merkez ve kenar hava çekişli güneş hava kollektörünün HAD analizleri yapılmış, farklı ışınım ve kütle debileri altında sistemin optimum çalışma aralıkları belirlenerek merkez ve kenar hava çekişli kollektörlerin tasarım karşılaştırılması yapılmıştır. Alüminyum balpeteği yapılı kollektörlerin, 600-1000 W/m² ışınım, 0.01-0.015 kg/s kütle debileri ve 300K sabit hava giriş sıcaklığı için termal analizleri gerçekleştirilmiş ve çıkan hava sıcaklık artış değerleri ve karşılık gelen termal verimlilikler bulunmuştur. Bulgular, kenar çekişli ve merkez çekişli güneş hava kollektöründen en yüksek hava sıcaklık çıkışının, 1000 W/m² ışınım ve 0.01 kg/s kütlesel debide sırasıyla 312K ve 310K olduğunu göstermiştir. En yüksek termal verimlilikler ise benzer şekilde her iki konfigürasyon için 600 W/m² ışınım ve 0,015 kg/s debide, kenar çekişli kollektör için yaklaşık %45, merkez çekişli kollektör için ise %42 olarak gerçekleşmiştir.

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“…To study the numerical approximations of partial differential equations, the computational fluid dynamic (CFD) technique is used. In this technique, there is a wide range of numerical methodologies, algorithms, schemes, simulation strategies as well as software programs for the solution (Afshari et al, 2018).…”

Section: Numerical Modelmentioning

confidence: 99%

Kaya Gazlarının Yanma Karakteristikleri ve İs oluşumu

Cellek

2020

European Journal of Science and Technology

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In this study, non-premixed combustion characteristics and soot formation of methane and various shale gaseous have been investigated in a combustion chamber under lean combustion conditions. After validation of the soot model with published experimental data, the flame characteristics considering flame lengths and diameters, intermediate species, temperatures, and pollutants of shale gaseous have been compared. The findings of this study show that the Moss-Brookes soot model predicts more accurate than the One-Step and Method of Moments models. Since the Methods of Moment method estimates higher soot formation than the experimental method, while the One-Step method estimates lower. The flame characteristics show that although the flame temperatures are close to each other, they differ relatively. In addition, flame lengths, flame reaction zones, and intermediate product concentrations differ similarly, and these differences also emerge as a factor in soot formation. Furthermore, the highest amount of soot is released during the combustion of Barnett shale gas. It is minimal for methane despite emitting intermediate species as much as shale gases. Since more unburned C elements released during the combustion of shale gases. Therefore, when the C/H ratio in hydrocarbon fuels increases, the amount of soot emitted from the flame also increases.

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On numerical methods; optimization of CFD solution to evaluate fluid flow around a sample object at low Re numbers

Cited by 41 publications

References 21 publications

Experimental and numerical analysis on using CuO-Al₂O₃/water hybrid nanofluid in a U-type tubular heat exchanger

Experimental and numerical analysis on using CuO-Al₂O₃/water hybrid nanofluid in a U-type tubular heat exchanger

Alüminyum Balpeteği Soğurucu Yüzeye Sahip bir Güneş Hava Kollektörünün HAD Analizi

Kaya Gazlarının Yanma Karakteristikleri ve İs oluşumu

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On numerical methods; optimization of CFD solution to evaluate fluid flow around a sample object at low Re numbers

Cited by 41 publications

References 21 publications

Experimental and numerical analysis on using CuO-Al2O3/water hybrid nanofluid in a U-type tubular heat exchanger

Experimental and numerical analysis on using CuO-Al2O3/water hybrid nanofluid in a U-type tubular heat exchanger

Alüminyum Balpeteği Soğurucu Yüzeye Sahip bir Güneş Hava Kollektörünün HAD Analizi

Kaya Gazlarının Yanma Karakteristikleri ve İs oluşumu

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Experimental and numerical analysis on using CuO-Al₂O₃/water hybrid nanofluid in a U-type tubular heat exchanger

Experimental and numerical analysis on using CuO-Al₂O₃/water hybrid nanofluid in a U-type tubular heat exchanger