TY - GEN
T1 - HEAT TRANSFER ENHANCEMENT FOR CIRCULAR CYLINDERS UNDERGOING FLOW-INDUCED VIBRATIONS
T2 - ASME 2023 International Mechanical Engineering Congress and Exposition, IMECE 2023
AU - Ali, Ussama
AU - Islam, Md
AU - Janajreh, Isam
N1 - Publisher Copyright:
Copyright © 2023 by ASME.
PY - 2023
Y1 - 2023
N2 - Effective heat transfer is of utmost importance in the design and operation of industrial components, such as heat exchanger tube bundles, as it directly dictates their efficiency and durability. These components often encounter flow-induced vibrations, which subsequently influence the heat transfer characteristics. This study focuses on investigating heat transfer and flow-induced vibrations in two circular cylinders. The Reynolds number (Re) is set at 100, and the reduced velocity (Ur) is increased from 2 to 14. The cylinders' dimensionless spacing (L/D), arranged in tandem, is changed from 1.5 to 6, and the stagger angle (α) between the cylinders is varied from tandem (0°) to staggered (45°) and side-by-side arrangement (90°). The lift (CL) and drag (CD) coefficients, streamwise and transverse vibrational amplitudes (Ax/D and Ay/D), average Nusselt number (Nuavg), Strouhal number (St), vortex shedding patterns, and temperature distribution are analyzed. Results reveal that the lock-in occurs at Ur = 8 for all arrangements. The results demonstrate that the Nuavg for the downstream cylinder is consistently lower than the upstream cylinder in the tandem arrangement due to the upstream cylinder providing a shielding effect. Rising L/D to 6 from 1.5 increases the Nuavg by 8.6% and 9.8% for downstream and upstream cylinders, respectively. As the L/D increases, the Nuavg for both cylinders increases, implying a reduction in the effect of each cylinder on the other. However, in the staggered and side-by-side arrangement, the Nuavg for both cylinders are similar, indicating that the cylinders have little to no influence on each other. The highest Nuavg is observed at the lock-in condition for all L/D and α values. The temperature contours mirror the vorticity contours, suggesting that vortex shedding has a positive effect on heat transfer.
AB - Effective heat transfer is of utmost importance in the design and operation of industrial components, such as heat exchanger tube bundles, as it directly dictates their efficiency and durability. These components often encounter flow-induced vibrations, which subsequently influence the heat transfer characteristics. This study focuses on investigating heat transfer and flow-induced vibrations in two circular cylinders. The Reynolds number (Re) is set at 100, and the reduced velocity (Ur) is increased from 2 to 14. The cylinders' dimensionless spacing (L/D), arranged in tandem, is changed from 1.5 to 6, and the stagger angle (α) between the cylinders is varied from tandem (0°) to staggered (45°) and side-by-side arrangement (90°). The lift (CL) and drag (CD) coefficients, streamwise and transverse vibrational amplitudes (Ax/D and Ay/D), average Nusselt number (Nuavg), Strouhal number (St), vortex shedding patterns, and temperature distribution are analyzed. Results reveal that the lock-in occurs at Ur = 8 for all arrangements. The results demonstrate that the Nuavg for the downstream cylinder is consistently lower than the upstream cylinder in the tandem arrangement due to the upstream cylinder providing a shielding effect. Rising L/D to 6 from 1.5 increases the Nuavg by 8.6% and 9.8% for downstream and upstream cylinders, respectively. As the L/D increases, the Nuavg for both cylinders increases, implying a reduction in the effect of each cylinder on the other. However, in the staggered and side-by-side arrangement, the Nuavg for both cylinders are similar, indicating that the cylinders have little to no influence on each other. The highest Nuavg is observed at the lock-in condition for all L/D and α values. The temperature contours mirror the vorticity contours, suggesting that vortex shedding has a positive effect on heat transfer.
KW - Flow-induced vibrations
KW - Heat transfer enhancement
KW - Spacing ratio
KW - Staggered cylinders
KW - Tandem cylinders
KW - Vortex shedding
UR - http://www.scopus.com/inward/record.url?scp=85185715960&partnerID=8YFLogxK
U2 - 10.1115/IMECE2023-112807
DO - 10.1115/IMECE2023-112807
M3 - Conference contribution
AN - SCOPUS:85185715960
T3 - ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
BT - Heat Transfer and Thermal Engineering
PB - The American Society of Mechanical Engineers(ASME)
Y2 - 29 October 2023 through 2 November 2023
ER -