Effect of corrugation depth on heat transfer enhancement and flow characteristics for corrugated tubes
Other Title(s)
تأثير عمق النتوء على تحسين انتقال الحرارة و خصائص الجريان للأنابيب المحلزنة
Joint Authors
Sadiq, Ibrahim Imad
al-Dabbagh, Amir Majid
Hatim, Falah Fakhir
Source
Journal of University of Babylon for Engineering Sciences
Issue
Vol. 26, Issue 7 (31 Jul. 2018), pp.164-181, 18 p.
Publisher
Publication Date
2018-07-31
Country of Publication
Iraq
No. of Pages
18
Main Subjects
Abstract EN
Three.corrugated.tubes.withvariouscorrugation.depthsare.experimentallyand numerically.investigated.Air.is usedas a working.fluid.in.tube.side.heated.bysaturated.steam.passing.through.the.shell.of heat.exchanger where.constant wall temperature.at the.tube side was achieved.
The dimensionless corrugation depth (e/Dh) are 0.0216, 0.0469 and 0.0798.However, the corrugation angle (θ)and pitch to diameter ratio (p/Dh) were keptnearly constant of9οand 0.5, respectively.
The experiments were carried out over the turbulent range of Reynolds number from 5000 to 50,000.The results reveal that the average Nusselt number is increased by 46%, 67% and 105% for corrugation depth ratios of 0.0216, 0.0469 and 0.0798, respectively compared with the smooth tube.
However, the average friction factor of the corrugated tube with e/Dh =0.0216, 0.0469 and 0.0798are 90%, 135% and 500% higher than of smooth tube, respectively.
At the same pumping power, the optimumNusselt number ratio was 1.4 obtained by corrugated tube with intermediate depth ratio (e/Dh =0.0469).
To.visualize the.Flow behaviorof flow.inside corrugated.tubes, the numerical.approach.wasused.tosolvethree-dimensional.governing equations.with.shear stress transport k-ω model by usingANSYS,Fluent 15.
Solid work was used to generate the physical domain of corrugated tube.
The numerical.resultshowed.that.there is .mainvortex.Generatedin.themain .flow .due to rotational flow induced .alongthe helical path.In addition, secondary vortex is originated behind the rib.
These.two vortices .can promote .flow .mixing between .theflow.layers.andbreak.the boundary layer.
Consequently, achieve high heat transfer improvement.
American Psychological Association (APA)
al-Dabbagh, Amir Majid& Hatim, Falah Fakhir& Sadiq, Ibrahim Imad. 2018. Effect of corrugation depth on heat transfer enhancement and flow characteristics for corrugated tubes. Journal of University of Babylon for Engineering Sciences،Vol. 26, no. 7, pp.164-181.
https://search.emarefa.net/detail/BIM-923708
Modern Language Association (MLA)
al-Dabbagh, Amir Majid…[et al.]. Effect of corrugation depth on heat transfer enhancement and flow characteristics for corrugated tubes. Journal of University of Babylon for Engineering Sciences Vol. 26, no. 7 (2018), pp.164-181.
https://search.emarefa.net/detail/BIM-923708
American Medical Association (AMA)
al-Dabbagh, Amir Majid& Hatim, Falah Fakhir& Sadiq, Ibrahim Imad. Effect of corrugation depth on heat transfer enhancement and flow characteristics for corrugated tubes. Journal of University of Babylon for Engineering Sciences. 2018. Vol. 26, no. 7, pp.164-181.
https://search.emarefa.net/detail/BIM-923708
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references : p. 179-180
Record ID
BIM-923708