Year 2020, Volume 40 , Issue 2, Pages 237 - 250 2020-10-31

NATURAL CONVECTION OF ETHYLENE GLYCOL AND WATER MIXTURE BASED AL2O3 NANOFLUIDS BETWEEN VERTICAL CONCENTRIC CYLINDERS
DİK KONSANTRİK SİLİNDİRLER ARASINDAKİ AL2O3-ETİLEN GLİKOL VE SU KARIŞIM BAZLI NANOAKIŞKANLARIN DOĞAL KONVEKSİYONU

Kamil KAHVECİ [1] , Elif ÖĞÜT [2]


Natural convection of ethylene glycol (EG) and water mixture based Al2O3 nanofluids between vertical concentric circular cylinders heated from the inner wall and cooled from the outer wall was investigated numerically in this study. The computations were carried for the Rayleigh numbers of 104, 105, 106, and 107, nanoparticle volume fractions of 0%, 4% and 8%, ethylene glycol (EG) to water volume ratios of 0:100 %, 50:50%, and 100:0%, the radius ratios of 2, 3 and 4, and aspect ratios of 0.5, 1, and 2. The Brinkman model was used to predict the viscosity and the Yu and Choi model for the thermal conductivity of nanofluid. The results show that the average Nusselt number shows a considerable increase with an increase in the Rayleigh number and radius ratio. The results also show that the average Nusselt number shows a medium increase with increasing nanoparticle volume fraction and a slight increase with increasing volume ratios of EG to water. Furthermore, the results show that the average Nusselt number experiences first an increase then a decrease with an increase in the aspect ratio except for the low Ra numbers. Finally, the average Nusselt number experiences a slight increase with the aspect ratio for the low Rayleigh numbers.

Bu çalışmada iç duvardan ısıtılan ve dış duvardan soğutulan dikey eş merkezli dairesel silindirler arasında etilen glikol (EG) ve su karışım bazlı Al2O3 nanoakışkanların doğal konveksiyonu sayısal olarak incelenmiştir. Hesaplamalarda Rayleigh sayıları 104, 105, 106 ve 107, nanoparçacık hacim fraksiyonları % 0,% 4 ve % 8, etilen glikol (EG) - su hacim oranları %0:100, % 50:50 ve % 100: 0, yarıçap oranları 2, 3 ve 4 ve görünüş oranları 0.5,1 ve 2 olarak alınmıştır. Nanoakışkanın termal iletkenliği için Yu ve Choi modeli ve vikozitesi içinde Brinkman modeli kullanılmıştır. Sonuçlar, ortalama Nusselt sayısının Rayleigh sayısı ve yarıçap oranındaki artışla önemli miktarlarda arttığını göstermektedir. Sonuçlar ayrıca ortalama Nusselt sayısının artan nanoparçacık hacim fraksiyonu ile orta seviyede bir artış ve EG-su hacim oranı artışı ile küçük bir artış sergilediğini göstermektedir. Sonuçlar ayrıca, ortalama Nusselt sayısının düşük Ra sayıları dışında, görünüş oranındaki artışla önce artmakta sonra bir azalma göstermektedir. Son olarak, ortalama Nusselt sayısı düşük Rayleigh sayıları için artan görünüş oranıyla küçük bir artış göstermektedir
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Primary Language en
Subjects Engineering, Mechanical
Journal Section Research Article
Authors

Orcid: 0000-0003-2492-8690
Author: Kamil KAHVECİ
Institution: TRAKYA UNIVERSITY
Country: Turkey


Orcid: 0000-0001-7037-9018
Author: Elif ÖĞÜT
Institution: Kocaeli University
Country: Turkey


Dates

Publication Date : October 31, 2020

Bibtex @research article { isibted817005, journal = {Isı Bilimi ve Tekniği Dergisi}, issn = {1300-3615}, address = {}, publisher = {Türk Isı Bilimi ve Tekniği Derneği}, year = {2020}, volume = {40}, pages = {237 - 250}, doi = {10.47480/isibted.817005}, title = {NATURAL CONVECTION OF ETHYLENE GLYCOL AND WATER MIXTURE BASED AL2O3 NANOFLUIDS BETWEEN VERTICAL CONCENTRIC CYLINDERS}, key = {cite}, author = {Kahveci̇, Kamil and Öğüt, Elif} }
APA Kahveci̇, K , Öğüt, E . (2020). NATURAL CONVECTION OF ETHYLENE GLYCOL AND WATER MIXTURE BASED AL2O3 NANOFLUIDS BETWEEN VERTICAL CONCENTRIC CYLINDERS . Isı Bilimi ve Tekniği Dergisi , 40 (2) , 237-250 . DOI: 10.47480/isibted.817005
MLA Kahveci̇, K , Öğüt, E . "NATURAL CONVECTION OF ETHYLENE GLYCOL AND WATER MIXTURE BASED AL2O3 NANOFLUIDS BETWEEN VERTICAL CONCENTRIC CYLINDERS" . Isı Bilimi ve Tekniği Dergisi 40 (2020 ): 237-250 <https://dergipark.org.tr/en/pub/isibted/issue/57550/817005>
Chicago Kahveci̇, K , Öğüt, E . "NATURAL CONVECTION OF ETHYLENE GLYCOL AND WATER MIXTURE BASED AL2O3 NANOFLUIDS BETWEEN VERTICAL CONCENTRIC CYLINDERS". Isı Bilimi ve Tekniği Dergisi 40 (2020 ): 237-250
RIS TY - JOUR T1 - NATURAL CONVECTION OF ETHYLENE GLYCOL AND WATER MIXTURE BASED AL2O3 NANOFLUIDS BETWEEN VERTICAL CONCENTRIC CYLINDERS AU - Kamil Kahveci̇ , Elif Öğüt Y1 - 2020 PY - 2020 N1 - doi: 10.47480/isibted.817005 DO - 10.47480/isibted.817005 T2 - Isı Bilimi ve Tekniği Dergisi JF - Journal JO - JOR SP - 237 EP - 250 VL - 40 IS - 2 SN - 1300-3615- M3 - doi: 10.47480/isibted.817005 UR - https://doi.org/10.47480/isibted.817005 Y2 - 2020 ER -
EndNote %0 Isı Bilimi ve Tekniği Dergisi NATURAL CONVECTION OF ETHYLENE GLYCOL AND WATER MIXTURE BASED AL2O3 NANOFLUIDS BETWEEN VERTICAL CONCENTRIC CYLINDERS %A Kamil Kahveci̇ , Elif Öğüt %T NATURAL CONVECTION OF ETHYLENE GLYCOL AND WATER MIXTURE BASED AL2O3 NANOFLUIDS BETWEEN VERTICAL CONCENTRIC CYLINDERS %D 2020 %J Isı Bilimi ve Tekniği Dergisi %P 1300-3615- %V 40 %N 2 %R doi: 10.47480/isibted.817005 %U 10.47480/isibted.817005
ISNAD Kahveci̇, Kamil , Öğüt, Elif . "NATURAL CONVECTION OF ETHYLENE GLYCOL AND WATER MIXTURE BASED AL2O3 NANOFLUIDS BETWEEN VERTICAL CONCENTRIC CYLINDERS". Isı Bilimi ve Tekniği Dergisi 40 / 2 (October 2020): 237-250 . https://doi.org/10.47480/isibted.817005
AMA Kahveci̇ K , Öğüt E . NATURAL CONVECTION OF ETHYLENE GLYCOL AND WATER MIXTURE BASED AL2O3 NANOFLUIDS BETWEEN VERTICAL CONCENTRIC CYLINDERS. Isı Bilimi ve Tekniği Dergisi. 2020; 40(2): 237-250.
Vancouver Kahveci̇ K , Öğüt E . NATURAL CONVECTION OF ETHYLENE GLYCOL AND WATER MIXTURE BASED AL2O3 NANOFLUIDS BETWEEN VERTICAL CONCENTRIC CYLINDERS. Isı Bilimi ve Tekniği Dergisi. 2020; 40(2): 237-250.
IEEE K. Kahveci̇ and E. Öğüt , "NATURAL CONVECTION OF ETHYLENE GLYCOL AND WATER MIXTURE BASED AL2O3 NANOFLUIDS BETWEEN VERTICAL CONCENTRIC CYLINDERS", Isı Bilimi ve Tekniği Dergisi, vol. 40, no. 2, pp. 237-250, Oct. 2020, doi:10.47480/isibted.817005