The effect of the eccentricity of the annular fin in the bundle of fins exposed to flow on its thermal stresses

In this paper, the effect of the passed fluid flow around a fin in the bundle of annular fins with different eccentricity on thermal stresses created in it is discussed. To solve the turbulent fluid flow equations and thermal stress in solid, the volume element with k-ε model and finite element methods are used, respectively. The results are obtained for 2 fin spacing and 4 heights of fins. Then, in each fin height, the effect of 5 eccentricities on decrease of thermal stress are considered. The results show that at each fin height there is an optimal eccentricity for which the thermal stress in the fin reaches its minimum value. The results show that the maximum decrease of thermal stress in optimal eccentricity related to fin heigh 4mm for both fin spacing of 4 mm and 8mm are 30 , 35% respectively. Also, in fin spacing of the 8 mm at different heights of 8, 6, 4, and 2 mm, the optimal eccentricities are 3, 2.25, 1.5, and 0.5 mm, respectively and in fin spacing of the 4 mm at different heights of 8, 6, 4, and 2 mm, the optimal eccentricities are 3, 2.25, 1.5, and 0.25 mm, respectively.