Analysis of Thermal Stresses Induced in Radiant Tubes for Heat Exchanger Applications Using Finite Element Method
Abstract
In this research, the thermal stresses in the radiant tubes were analyzed using finite element method successfully. Thermal stresses are critical factor influencing on the strength of heat exchanger tubes. Radiant tube of Steel Alloy, Super 22H was analyzed by using finite element analysis. It is investigated that thermal stresses in radiant tubes faces different temperature gradients in axial, circumferential and radial directions. There are no significant thermal stresses in axial direction when there is linear temperature gradient. In addition, it is observed that considerable thermal stresses are induced with nonlinear temperature gradient in axial direction. In order to calculate thermal stresses in circumferential direction, the temperature variations in angular position is also applied. Radial thermal stresses are calculated by applying specific temperature difference between inner and outer radii. Localized heating & hot spot in inner or outer radii and bend in tubes are also major causes of thermal stresses.References
M. A. Irfan and W. Chapman, “Thermal stresses in radiant tubes due to axial, circumferential and radial temperature distributionsâ€, Applied Thermal Engineering, vol. 29, no. 10, pp. 1913-1920, 2009.
A. Kandil, A. El-Kady and A. El-Kafrawy, “Transient thermal stress analysis of thick-walled cylindersâ€, International journal of mechanical sciences, vol. 37, no. 7, pp. 721-732, 1995.
T. Ma, Y. Chen, M. Zeng and Q. Wang, “Stress analysis of internally finned bayonet tube in a high temperature heat exchangerâ€, Applied Thermal Engineering, vol. 43, pp. 101-108, 2012.
M.-S. Liu, Q.-W. Dong, D.-B. Wang and X. Ling, “Numerical simulation of thermal stress in tube-sheet of heat transfer equipmentâ€, International Journal of Pressure Vessels and Piping, vol. 76, No. 10, pp. 671-675, 1999.
M. Rahimi, I. Owen and J. Mistry, “Thermal stresses in boiler tubes arising from high-speed cleaning jetsâ€, International Journal of Mechanical Sciences, vol. 45, no. 6, pp. 995-1009, 2003.
O. Flores, C. Marugán-Cruz, D. Santana and M. GarcÃa-Villalba, “Thermal stresses analysis of a circular tube in a central receiverâ€, Energy Procedia, vol. 49, pp. 354-362, 2014.
V. Özceyhan and N. Altuntop, “Heat transfer and thermal stress analysis in grooved tubesâ€, Sadhana, vol. 30, no. 4, pp. 537-553, 2005.
H. Yapıcı, G. Baştürk and B. Albayrak, “Numerical study on conjugate heat transfer in laminar fully developed flow with temperature dependent thermal properties through an externally heated SiC/SiC composite pipe and thermally induced stress,†Energy conversion and management, vol. 46, no. 4, pp. 633-654, 2005.
K. Asemi, M. Salehi and M. Akhlaghi, “Transient thermal stresses in functionally graded thick truncated cones by graded finite element method,†International Journal of Pressure Vessels and Piping, vol. 119, pp. 52-61, 2014.
S. Stasyuk, V. Gromovyk and A. Bichuya, “Thermal-stress analysis of hollow cylinder with temperature-dependent thermal conductivity,†Strength of Materials, vol. 11, no. 1, pp. 50-52, 1979.
F. Wang, Y. Shuai, Y. Yuan and B. Liu, “Effects of material selection on the thermal stresses of tube receiver under concentrated solar irradiation,†Materials & Design, vol. 33, pp. 284-291, 2012.
Alzaharnah, M. Hashmi and B. Yilbas, “Thermal stresses in thick-walled pipes subjected to fully developed laminar flow,†Journal of Materials Processing Technology, vol. 118, no. 1, pp. 50-57, 2001.
M. Jabbari, S. Sohrabpour, and M. Eslami, “Mechanical and thermal stresses in a functionally graded hollow cylinder due to radially symmetric loads†, International Journal of Pressure Vessels and Piping, vol. 79, no. 7, pp. 493-497, 2002.
M. Bayat, M. Saleem, B. Sahari, A. Hamouda and E. Mahdi, “Mechanical and thermal stresses in a functionally graded rotating disk with variable thickness due to radially symmetry loads,†International Journal of Pressure Vessels and Piping, vol. 86, no. 6, pp. 357-372, 2009.
V. Gromovyk and Y. G. Ivanik, “The thermal-stress state of heat-sensitive ceramic tubular systems in the case of convective heat exchangeâ€, Journal of Applied Mathematics and Mechanics, vol. 59, no. 1, pp. 159-163, 1995.
H. Yapıcı and B. Albayrak, “Numerical solutions of conjugate heat transfer and thermal stresses in a circular pipe externally heated with non-uniform heat fluxâ€, Energy Conversion and Management,
vol. 45, no. 6, pp. 927-937, 2004.
C. Chang, X. Li and Q. Zhang, “Experimental and numerical study of the heat transfer characteristics in solar thermal absorber tubes with circumferentially non-uniform heat fluxâ€, Energy Procedia, vol. 49, pp. 305-313, 2014.
H.A. Hadi, M.S. Kamran, N. Abbas and A.A. Khalid, “Computational fluid dynamics analysis of a gas turbine combustion chamber using AnsysCfx, Science International, vol. 28, no. 6,
pp. 5121-5125, 2016.
Goodier, “Thermal stress and deformationâ€, Journal of Applied Mechanics, vol. 24, no. 3, pp. 467-471, 1957.
C.H. Kent, Thermal stresses in thin-walled cylinders: PhD thesis, University of Michigan, 1931.
