Year 2019, Volume 39 , Issue 1, Pages 39 - 49 2019-04-30

HEAT TRANSFER IN THREE-DIMENSIONAL RECTANGULAR CAVITIES WITH PINS
PİMLİ ÜÇ BOYUTLU DİKDÖRTGEN KUTULARDA ISI TRANSFERİ

Zerrin SERT [1] , Çisil TİMURALP [2] , Mesut TEKKALMAZ [3]


The interaction of natural convection with thermal radiation in three dimensional rectangular cavities with gray surfaces is studied numerically. The cavity is heated and cooled from the vertical opposing isothermal walls while all other side walls are adiabatic. The pins are placed to the active wall. The fluid is nonparticipating air (Pr=0.71), and the flow of air is assumed to be laminar. The fluid properties are taken to be constant at mean values, except for the density for which the Boussinesq approximation is employed. The governing flow, energy and the radiative transfer equations are solved by a commercial CFD code-ANSYS. The convection terms are discretized using a second order upwind scheme, and SIMPLE algorithm is adapted as the solution algorithm. The surface to surface (S2S) model is used for radiative heat transfer simulations. The Rayleigh number (Ra), the surface emissivity (ε), the number of pins, the dimensionless pin length and diameter (B=b/H and D=d/H), the slenderness of the cavity (W/H) are variable parameters of this study. The slenderness ration of W/H=0.5, 1.0 and 2.0 are considered. Enclosure with pin arrangements of 9, 13, 17, 21 and 25 are considered. The Rayleigh number, the surface emissivity, the dimensionless pin lengths and diameters are varied in the following intervals 103≤Ra≤106, 0.0≤ε≤1.0, 0.05≤B≤0.6, 0.025≤D≤0.1, respectively. The mean Nusselt numbers for convection and radiation, as well as total, were computed as a function of the Rayleigh number for each case. Also the flow and temperature distribution for some cases have been presented and discussed.
Üç boyutlu gri yüzeyli dikdörtgen geometrili kutularda termal radyasyon ile doğal taşınımın etkileşimi sayısal olarak incelenmiştir. Dikdörtgen kutuda dikey karşıt izotermal duvarlar ısıtılıp soğutulurken, diğer tüm duvarlar yalıtılmıştır. Pimler sıcak duvara eklenmiştir. Katılımcı olmayan ortamda akışkanın hava (Pr=0.71) ve akışın laminer olduğu kabul edilmiştir. Boussinesq yaklaşımının kullanıldığı yoğunluk dışındaki tüm termofiziksel özelliklerinin sabit olduğu varsayılmıştır. Momentum, enerji denklemleri ve radyasyon transferi ticari CFD kodu ANSYS ile çözülmüştür. Taşınım terimlerinin ayrıklaştırılmasında ikinci dereceden ayrıklaştırma şeması, çözüm yöntemi olarak da SIMPLE algoritması ve yüzey ışınım hesabında S2S (Surface to Surface) ışınım modeli kullanılmıştır. Rayleigh sayısı (Ra), yüzey emissivitesi (ε), pim sayısı, boyutsuz pim çapları (D=d/H) ve uzunlukları (B=b/H), dikdörtgen kutunun genişlik yükseklik oranı (W/H) parametrik olarak değiştirilmiştir. Üç boyutlu kutunun, incelik oranı, W/H=0.5, 1.0 ve 2.0 olarak ele alınmıştır. Kutudaki pimlerin sayısı ise 9, 13, 17, 21 ve 25 olarak değiştirilmiştir. Rayleigh sayısı, yüzey emissivitesi, boyutsuz pim uzunlukları ve çapları, sırasıyla 103≤Ra≤106, 0.0≤ε≤1.0, 0.05≤B≤0.6, 0.025≤D≤0.1, değer aralıklarında değiştirilmiştir. Ortalama taşınım, radyasyon ve toplam Nusselt sayıları, her durum için Rayleigh sayısının bir fonksiyonu olarak hesaplanmıştır. Ayrıca ele alınan tüm durumlar için akış ve sıcaklık dağılımları verilmiş ve tartışılmıştır.
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Primary Language en
Subjects Engineering, Mechanical
Journal Section Research Article
Authors

Author: Zerrin SERT
Institution: ESKISEHIR OSMANGAZI UNIVERSITY
Country: Turkey


Author: Çisil TİMURALP
Institution: ESKISEHIR OSMANGAZI UNIVERSITY
Country: Turkey


Author: Mesut TEKKALMAZ
Institution: ESKISEHIR OSMANGAZI UNIVERSITY
Country: Turkey


Dates

Publication Date : April 30, 2019

Bibtex @research article { isibted781448, journal = {Isı Bilimi ve Tekniği Dergisi}, issn = {1300-3615}, address = {}, publisher = {Türk Isı Bilimi ve Tekniği Derneği}, year = {2019}, volume = {39}, pages = {39 - 49}, doi = {}, title = {HEAT TRANSFER IN THREE-DIMENSIONAL RECTANGULAR CAVITIES WITH PINS}, key = {cite}, author = {Sert, Zerrin and Timuralp, Çisil and Tekkalmaz, Mesut} }
APA Sert, Z , Timuralp, Ç , Tekkalmaz, M . (2019). HEAT TRANSFER IN THREE-DIMENSIONAL RECTANGULAR CAVITIES WITH PINS . Isı Bilimi ve Tekniği Dergisi , 39 (1) , 39-49 . Retrieved from https://dergipark.org.tr/en/pub/isibted/issue/56359/781448
MLA Sert, Z , Timuralp, Ç , Tekkalmaz, M . "HEAT TRANSFER IN THREE-DIMENSIONAL RECTANGULAR CAVITIES WITH PINS" . Isı Bilimi ve Tekniği Dergisi 39 (2019 ): 39-49 <https://dergipark.org.tr/en/pub/isibted/issue/56359/781448>
Chicago Sert, Z , Timuralp, Ç , Tekkalmaz, M . "HEAT TRANSFER IN THREE-DIMENSIONAL RECTANGULAR CAVITIES WITH PINS". Isı Bilimi ve Tekniği Dergisi 39 (2019 ): 39-49
RIS TY - JOUR T1 - HEAT TRANSFER IN THREE-DIMENSIONAL RECTANGULAR CAVITIES WITH PINS AU - Zerrin Sert , Çisil Timuralp , Mesut Tekkalmaz Y1 - 2019 PY - 2019 N1 - DO - T2 - Isı Bilimi ve Tekniği Dergisi JF - Journal JO - JOR SP - 39 EP - 49 VL - 39 IS - 1 SN - 1300-3615- M3 - UR - Y2 - 2019 ER -
EndNote %0 Isı Bilimi ve Tekniği Dergisi HEAT TRANSFER IN THREE-DIMENSIONAL RECTANGULAR CAVITIES WITH PINS %A Zerrin Sert , Çisil Timuralp , Mesut Tekkalmaz %T HEAT TRANSFER IN THREE-DIMENSIONAL RECTANGULAR CAVITIES WITH PINS %D 2019 %J Isı Bilimi ve Tekniği Dergisi %P 1300-3615- %V 39 %N 1 %R %U
ISNAD Sert, Zerrin , Timuralp, Çisil , Tekkalmaz, Mesut . "HEAT TRANSFER IN THREE-DIMENSIONAL RECTANGULAR CAVITIES WITH PINS". Isı Bilimi ve Tekniği Dergisi 39 / 1 (April 2019): 39-49 .
AMA Sert Z , Timuralp Ç , Tekkalmaz M . HEAT TRANSFER IN THREE-DIMENSIONAL RECTANGULAR CAVITIES WITH PINS. Isı Bilimi ve Tekniği Dergisi. 2019; 39(1): 39-49.
Vancouver Sert Z , Timuralp Ç , Tekkalmaz M . HEAT TRANSFER IN THREE-DIMENSIONAL RECTANGULAR CAVITIES WITH PINS. Isı Bilimi ve Tekniği Dergisi. 2019; 39(1): 39-49.
IEEE Z. Sert , Ç. Timuralp and M. Tekkalmaz , "HEAT TRANSFER IN THREE-DIMENSIONAL RECTANGULAR CAVITIES WITH PINS", Isı Bilimi ve Tekniği Dergisi, vol. 39, no. 1, pp. 39-49, Apr. 2019