TY  - JOUR
T1  - Numerical Investigation on Heat Enhancement Method with Using Circular Dimpled Tube
TT  - Dairesel Oyuntu ile Isı Transferi İyileştirilmesi Üzerine Sayısal Araştırma
AU  - Dağdevir, Toygun
AU  - Keklikcioglu, Orhan
AU  - Ozceyhan, Veysel
AU  - Gunes, Sibel
PY  - 2019
DA  - March
Y2  - 2018
DO  - 10.31200/makuubd.481202
JF  - Mehmet Akif Ersoy Üniversitesi Uygulamalı Bilimler Dergisi
JO  - MAKÜUBD
PB  - Burdur Mehmet Akif Ersoy Üniversitesi
WT  - DergiPark
SN  - 2602-425X
SP  - 19
EP  - 31
VL  - 3
IS  - 1
LA  - en
AB  - In thisstudy, the effect of dimpled tube which is heated with constant heat flux onheat transfer enhancement is numerically investigated Using physically enhancedtube is one of the passive heat transfer enhancement methods. The reason ofusing dimpled tube is increase turbulence through the tube and destruct thethermal boundary layer. The numerical study is validated with an experimentalstudy and configurations of cases are expanded with chancing pitch length. Theconsidered cases are conducted in Reynolds number range of 3000 to 8000. Usedfluid through the flow and its material copper are selected as water andcopper, respectively. The k- ε RNG turbulence model is used to simulateturbulent flow adjacent the inner wall surface. The analyses are determinedwith Nusselt number (Nu), friction factor (f) and performance evaluationcriteria (PEC). The highest Nusseltnumber and the minimum friction factor is obtained when the Reynolds number of8000, as 135.54 and 0.0599, respectively, for pitch length of 10 mm and 50 mm.The highest THP value is observed as 2.01 by the case of pitch length of 10 mmand Reynolds number of 3000.
KW  - Dimpled tube
KW  - Numerical study
KW  - Heat transfer
KW  - Performance evaluation criteria
N2  - Bu çalışmada sabit ısı akısı ile ısıtılmış bir boruya oyuntu yerleştirilmesinin ısı transferiiyileştirilmesi üzerindeki etkisi sayısal olarak araştırılmıştır. Fiziksel olarak boru üzerindeyapılan iyileştirme ısı transferi iyileştirilmesinin pasif metotlarından birisidir.Oyuntulaştırılmış boru kullanımının sebebi akış boyunca türbülansı arttırmak ve termal sınırtabakayı parçalamaktır. Sayısal çalışma, deneysel başka bir çalışma ile doğrulanmış veincelenen değişen hatve uzunlukları genişletilmiştir. İncelenen analizler Reynolds sayısının3000’den 8000’ e kadar gerçekleştirilmiştir. Akış boyunca kullanılan akışkan ve borumalzemesi sırasıyla su ve bakır olarak seçilmiştir. İç duvar etrafındaki türbülanslı akışınsimülasyonu için k-ε RNG türbülans modeli kullanılmıştır. Analizlerin sonuçları Nusseltsayısı (Nu), sürtünme katsayısı (f) ve performans değerlendirme kriteri (PEC) iledeğerlendirilmiştir. En yüksek Nu ve en düşük f Re sayısı 8000 iken, sırasıyla 130.54 ve0.0453 olarak, hatve uzunluğunun sırasıyla 10 mm ve 50 mm olduğu durumlarda eldeedilmiştir.
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UR  - https://doi.org/10.31200/makuubd.481202
L1  - https://dergipark.org.tr/tr/download/article-file/664023
ER  -