Random Articles
Reseach Article
Forced Convection Heat Transfer around Heated Inclined Cylinder
| International Journal of Computer Applications |
| Foundation of Computer Science (FCS), NY, USA |
| Volume 73 - Number 8 |
| Year of Publication: 2013 |
| Authors: Akram W. Ezzat, Hassan W. Zghaer |
10.5120/12759-8631
|
Akram W. Ezzat, Hassan W. Zghaer . Forced Convection Heat Transfer around Heated Inclined Cylinder. International Journal of Computer Applications. 73, 8 ( July 2013), 5-11. DOI=10.5120/12759-8631
Abstract
Experimental and numerical investigations are conducted to study heat transfer coefficient around cylindrical shape bluff body subjected to constant heat flux at its outer surface and cooled by air steam flowing around it. The study covered positioning the cylinder in vertical, horizontal and 45o inclined angle with respect to the free air stream, with its axis in horizontal position parallel to the flow and Reynolds numbers ranging (8,900 - 48,000) for vertical, inclined and horizontal positions. Numerical approach is realized by conducting mathematical model of the problem and solving it numerically using a CFD Code FLUENT 6. 3. 26 after describing the mesh model using the Gambit 2. 2. 30. Three dimensional Cartesian coordinate system is considered in this study. The studied geometry is generated by using GAMBIT with dimensions of rectangular box L=127mm, W=130mm and H=129mm. The dimensions of heated cylinder is set identical to the experimental test H=90mm and R=17mm. Proper assumptions are based to solve the governed equations. The experiments are based on air as cooling fluid to investigate heat transfer coefficient around the heated cylinder. Constant heat flux is generated on the surface of the cylinder using proper electrical heater. The heat flux around the cylinder equal (5217, 5201 and 5284 W/m2) for vertical, inclined and horizontal positions respectively. Air flow is ensured around the heated cylinder at different velocities using proper test rig. Local heat transfer coefficients around the cylinder are investigated based on the heat flux measured value and the temperature differences between local cylinder surface temperature and the air stream temperature measured by thermocouples, and standard Pitot-static tube with curved junction (N. P. L standard) was used to measure air free stream velocity. The conducted comparison between the recent experimental results and those obtained from previous work showed reliable agreement. Where maximum error obtained from this comparison was 6. 4% for vertical position.
References
- A. Zukauskas, and J. Ziugzda, (1985), ''Heat Transfer of Cylinder in Cross flow'' Hemisphere Publishing Corp. , Washington
- V. T. Morgan (197''The overall convective heat transfer from smooth circular cylinders'' Adv. Heat Transfer, Vol, 11, pp. 199–264
- A. H. Davis (1942),''Convective cooling of wires in streams of viscous liquid''Phil. Mag. , 47 pp. 1057–1092
- H. A. Kramers (1960) ''Heat transfer from cylinder to flowing media''Physica, Vol, 12 ,pp. 61–8
- D. A. Van Mell, (1962),''A method for the determination of local convection heat transfer from a cylinder placed normal to an air stream''Int. J. Heat and Mass Transfer, Vol. 5, pp. 715-722.
- H. C. Perkins, G. Leppert (1964) ''Local heat-transfer coefficients on a uniformly heated cylinder'' Int. J. Heat Mass Transfer, Vol, 7, pp. 143–
- R. M Fand, (1965): ''Heat Transfer by Forced Convection From a cylinder to Water in Cross Flow ''Int. J. Heat and Mass Transfer, Vol. 8 ,pp. 995.
- W. Chun, and R. F Boehm, (1989)''Calculation of forced flow and heat transfer Around acylinder in cross flow''Numerical Heat Transfer, Vol. 15, pp, 101-122
- S. Sanitjai, R. J. Goldstein (2004)''Forced convection heat transfer from a circular cylinder in cross flow to air and liquids'' Journal of Fluid Mechanics, Vol. 47, pp. 4795-4805.
- R. P. Bharti, R. P. Chhabra, V. Eswaran (2007). ''A numerical study of the steady forced convection heat transfer from an unconfined circular cylinder''Int. J. Heat Mass Transfer, Vol 43 , pp. 639–648
- S. Sarkar, A. Dalal, G. Biswas, (2011)''Unsteady wake dynamics and heat transfer in forced and mixed convection past a circular cylinder in cross flow for high Prandtl numbers''Journal Fluid Mechanics,Vol. 54 ,pp. 3536-3551.
- J. D. D'Alessio, (1997)Steady and unsteady forced convection past an inclined elliptic cylinder Acta echanic Vol 123, pp. 99-115
- H. M. Badr (1998) ''Forced convection from a straight elliptical tube'' Heat Mass Transfer, Vol,34, pp. 229–236
- Eball H. Ahmad, Hassan M. Badr (2001)Mixed convection from an elliptic tube placed in a fluctuating free stream Int. J. of Engineering Science Vol. 39, pp. 669-693
- R. P. Bharti, R. P. Chhabra, V. Eswaran (2007). ''A numerical study of the steady forced convection heat transfer from an unconfined circular cylinder'' Int. J. Heat Mass Transfer, Vol 43 , pp. 639–648
- R. P. Bharti, P. Sivakumar and R. P. Chhabra (2008)''Forced convection heat transfer from an elliptical cylinder to power-law fluids''Int. J. Heat and Mass Transfer, Vol. 51, pp. 1838-1853
- T. S. Sarma and S. P. Sukhatme (1977). Local heat transfer from a horizontal cylinder to air in cross ''flow Influence of free convection''Int. J. Heat and Mass Transfer, Vol. 20, pp. 51-56. H. C. Perkins, and G. Leppert, (1964)
- R. A. Ahmad (1996). ''Steady-state numerical solution of the Navier–Stokes and energy equations around a horizontal cylinder at moderate Reynolds numbers from 100 to 500'' Heat Transfer Eng. Vol, 17 pp. 31–81
- Y. A. Çengel (1998) ''Heat Transfer: A Practical Approach'' McGraw-Hill, Boston, Massachusetts
- C. Sak, R. Liu, D. S. -K. Ting (2007)''The role of turbulence length scale and turbulence intensity on forced convection from a heated horizontal circular cylinder''Journal of Fluid Mechanics, Vol. 31,pp. 279-289
Index Terms
Keywords