Volume 19, Issue 6 (June 2019)                   Modares Mechanical Engineering 2019, 19(6): 1429-1437 | Back to browse issues page

XML Persian Abstract Print


Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

alikhani S, ganjbakhsh N, behzadmehr A. Numerical Study of the Effect of Grashof Number on the Mixed Convection Heat Transfer of Laminar Flow in Horizontal Curved Enhanced Heat Transfer Vipertex Tube. Modares Mechanical Engineering 2019; 19 (6) :1429-1437
URL: http://mme.modares.ac.ir/article-15-20960-en.html
1- Mechanical Engineering Department, Faculty of Marine Engineering, Chabahar Maritime University, Chabahar, Iran , s.alikhani@cmu.ac.ir
2- Mechanical Engineering Department, Shahid Nikbakht Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran
Abstract:   (4162 Views)
Thermal and hydrodynamic behavior of a laminar flow of water within a horizontal curved Vipertex tube with mixed convection heat transfer, in the range of low Grashof numbers, has been numerically studied. The curved horizontal Vipertex tube has geometry of 180o, fixed radius of centerline curvature of 2R/D=6.62, roughness height e/D=0.1, and a constant heat flux is exerted on the walls. The three-dimensional governing equations were using a finite volume method. To solve the problem, the computational fluid dynamics of ANSYS Fluent The results reveal that not only Grashof number and the buoyancy forces arising from it, but the mutual effects of the centrifugal and the buoyancy forces affect the thermal and hydrodynamic characteristics such as axial velocity contours, secondary flow vectors, temperature contours, heat transfer coefficient, and skin friction coefficient. So that, for a given Reynolds number, increasing due to more interaction between buoyancy and centrifugal forces, results in the Vipertex tube. Therefore, the buoyancy forces decrease and lead to the lower heat transfer coefficient, but in smooth curved Grashof number leads to the higher heat transfer coefficient. Nevertheless, the Vipertex curved tube in of Grashof and Reynolds, in each Grashof and Reynolds equally, has a higher heat transfer than a smooth curved pipe. The results also indicated that the skin friction coefficient in these types of tubes can be up to 3.5 times higher than that of smooth one with a Grashof increase.
 
Full-Text [PDF 1317 kb]   (2080 Downloads)    
Article Type: Original Research | Subject: Computational Fluid Dynamic (CFD)
Received: 2018/05/17 | Accepted: 2018/11/10 | Published: 2019/06/1

References
1. Rohsenow WM, Hartnett JP, Cho YI, editors. Handbook of heat transfer. Volume 1. 3rd Edition. New York: McGraw-Hill; 1998. [Link]
2. Nivesrangsan P, Pethkool S, Nanan K, Pimsarn M, Eiamsa-ard S. Thermal performance assessment of turbulent flow through dimpled tubes. 14th International Heat Transfer Conference, 8-13 August, 2010, Washington DC, USA. New York: The American Society of Mechanical Engineers; 2010. [Link] [DOI:10.1115/IHTC14-22503]
3. Kukulka DJ, Smith R, Zaepfel J. Development and evaluation of vipertex enhanced heat transfer tubes for use in fouling conditions. Theoretical Foundations of Chemical Engineering. 2012;46(6):627-633. [Link] [DOI:10.1134/S0040579512060152]
4. Kukulka DJ, Smith R. Thermal-hydraulic performance of Vipertex 1EHT enhanced heat transfer tubes. Applied Thermal Engineering. 2013;61(1):60-66. [Link] [DOI:10.1016/j.applthermaleng.2012.12.037]
5. Kukulka DJ, Smith R, Li W. Comparison of condensation and evaporation heat transfer on the outside of smooth and enhanced 1EHT tubes. Applied Thermal Engineering. 2016;105:913-922. [Link] [DOI:10.1016/j.applthermaleng.2016.03.036]
6. Sobhani M, Behzadmehr A. Numerical study of the effect of roughness on the heat transfer Improvised pipes of heat transfer. 3rd Nation Conference and 1st International Conference on Applied Reasearch in Electrical, Mechanical and Mechatronic, 17 February, 2016, Tehran, Iran. Tehran: Male Ashtar University of Technology; 2016. [Persian] [Link]
7. Kumar P, Kumar A, Chamoli S, Kumar M. Experimental investigation of heat transfer enhancement and fluid flow characteristics in a protruded surface heat exchanger tube. Experimental Thermal and Fluid Science. 2016;71:42-51. [Link] [DOI:10.1016/j.expthermflusci.2015.10.014]
8. Sarmadian A, Shafaee M, Mashouf H, Mohseni SG. Condensation heat transfer and pressure drop characteristics of R-600a in horizontal smooth and helically dimpled tubes. Experimental Thermal and Fluid Science. 2017;86:54-62. [Link] [DOI:10.1016/j.expthermflusci.2017.04.001]
9. Ayub ZH, Ayub AH, Ribatski G, Moreira TA, Khan TS. Two-phase pressure drop and flow boiling heat transfer in an enhanced dimpled tube with a solid round rod insert. International Journal of Refrigeration. 2017;75:1-13. [Link] [DOI:10.1016/j.ijrefrig.2017.01.008]
10. Aroonrat K, Wongwises S. Condensation heat transfer and pressure drop characteristics of R-134a flowing through dimpled tubes with different helical and dimpled pitches. International Journal of Heat and Mass Transfer. 2018;121:620-631. [Link] [DOI:10.1016/j.ijheatmasstransfer.2018.01.001]
11. Aroonrat K, Wongwises S. Experimental investigation of condensation heat transfer and pressure drop of R-134a flowing inside dimpled tubes with different dimpled depths. International Journal of Heat and Mass Transfer. 2019;128:783-793. [Link] [DOI:10.1016/j.ijheatmasstransfer.2018.09.039]
12. Liu Y, Rao Y, Weigand B. Heat transfer and pressure loss characteristics in a swirl cooling tube with dimples on the tube inner surface. International Journal of Heat and Mass Transfer. 2019;128:54-65. [Link] [DOI:10.1016/j.ijheatmasstransfer.2018.08.097]
13. Ming T, Cai C, Yang W, Shen W, Gan T. Optimization of dimples in microchannel heat sink with impinging jets-Part A: Mathematical model and the influence of dimple radius. Journal of Thermal Science. 2018;27(3):195-202. [Link] [DOI:10.1007/s11630-018-1000-9]
14. Shui L, Sun J, Gao F, Zhang Ch. Flow and heat transfer in the tree-like branching microchannel with/without dimples. Entropy. 2018;20(5):379. [Link] [DOI:10.3390/e20050379]
15. Li LJ, Lin CX, Ebadian MA. Turbulent mixed convective heat transfer in the entrance region of a curved pipe with uniform wall-temperature. International Journal of Heat and Mass Transfer. 1998;41(23):3793-3805. [Link] [DOI:10.1016/S0017-9310(98)00100-8]
16. Sillekens JJM, Rindt CCM, Van Steenhoven AA. Mixed convection in a 90 Deg horizontal bend. 10th International Heat Transfer Conference, 14-18 August, 1994, Brighton, UK. Rugby: Institute of Chemical Engineers; 1994. [Link]
17. Goering DJ, Humphrey JAC, Greif R. The dual influence of curvature and buoyancy in fully developed tube flows. International Journal of Heat and Mass Transfer. 1997;40(9):2187-2199. [Link] [DOI:10.1016/S0017-9310(96)00248-7]
18. Ghaffari O, Behzadmehr A, Ajam H. Turbulent mixed convection of a nanofluid in a horizontal curved tube using a two-phase approach. International Communications in Heat and Mass Transfer. 2010;37(10):1551-1558. [Link] [DOI:10.1016/j.icheatmasstransfer.2010.09.003]
19. Alikhani S, Behzadmehr A, Saffar-Avval M. Numerical study of nanofluid mixed convection in a horizontal curved tube using two-phase approach. Heat and Mass Transfer. 2011;47(1):107-118. [Link] [DOI:10.1007/s00231-010-0677-4]
20. Huminic G, Huminic A. Heat transfer and flow characteristics of conventional fluids and nanofluids in curved tubes: A review. Renewable and Sustainable Energy Reviews. 2016;58:1327-1347. [Link] [DOI:10.1016/j.rser.2015.12.230]
21. Fox RW, McDonald AT, Pritchard PJ. Introduction to fluid mechanics. 6th Edition. Hoboken: Wiley; 2005. pp. 213-215. [Link]
22. Frank WM. Fluid mechanics. Volume 1. 5th Edition. Boston: McGraw-Hill; 2003. pp 188-189. [Link]
23. Wojtkowiak J, Popiel CO. Effect of cooling on pressure losses in U-type wavy pipe flow. International Communications in Heat and Mass Transfer. 2000;27(2):169-177. [Link] [DOI:10.1016/S0735-1933(00)00098-1]
24. Ito H. Friction factors for turbulent flow in curved pipes. The American Society of Mechanical Engineers. 1959;81:123-134. [Link]

Add your comments about this article : Your username or Email:
CAPTCHA

Send email to the article author


Rights and permissions
Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.