tailieunhanh - Heat Analysis and Thermodynamic Effects Part 3

Tham khảo tài liệu 'heat analysis and thermodynamic effects part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Stress of Vertical Cylindrical Vessel for Thermal Stratification of Contained Fluid 49 1 I- 1 o E ----Bi FEM X Bi simple Bi FEM 0 Bi simple ----Bi FEM A Bi simple ----Bi FEM Bi simple 4 8 z t 12 Fig. 6. Vessel temperatures for ramp-shaped fluid temperature 0 LU b II co Ỉ Bi L 8t X. 1 V 1 _ A X IX 1 X 1 V 1 1 1 qLx 1 Szb FEM 0 Szb simple Shm FEM X Shm simple Shb FEM A Shb simple r r T 4 8 z t 12 16 20 24 Fig. 7. Thermal stresses for ramp-shaped fluid temperature charts were developed for b p and pL 5. When b p approaches 0 S approaches 0. S is approximately inversely proportional to L for pL 5. The maximum stress location Az represents the outward distance from either end of the stratified layer. In the cold section the maximum tensile positive stress occurs on the inner surface at z -Az while in the hot section the maximum compressive negative stress occurs on the inner surface at z L Az. In addition by substituting z into Eq. 32 we can calculate the wall-averaged temperature which is applicable to the reference temperature for material properties in structural design. 50 Heat Analysis and Thermodynamic Effects Fig. 8. The maximum bending stress 0 1 N 0 1 2 ỊỈL 3 4 5 Fig. 9. Location of the maximum bending stress Stress of Vertical Cylindrical Vessel for Thermal Stratification of Contained Fluid 51 Fig. 10. The maximum membrane stress Location of Shm max 0 0 1 L 2 b 1 2 3 4 5 6 0 8 ---b 10 20 30 50 100 b ra Fig. 11. Location of the maximum membrane .