Numerical study of a vortex-induced vibration technique for passive heat transfer enhancement in internal turbulent flow

Due to many applications in engineering, the study of the vortex-induced vibration is of great importance. In the present study, a passive heat transfer enhancement technique for turbulent flow through the channel with constant wall temperature at ReD=1000 (based on the cylinder diameter) is studied. A flexible plate is attached to the stationary cylinder and the numerical analysis are carried out over a wide range of solid and fluid parameters such as density ratio (2.54-127), dimensionless Young's modulus (1.1-11 *106), Reynolds number (300-1000), Prandtl Number (6.8 and 68), velocity and temperature profiles. As a result, although the variation of natural frequency by density and Young's modulus of the plate alters the frequency and amplitude of oscillation, the performance evaluation criteria (PEC) number does not change. Velocity profile has a significant effect on increasing heat transfer rate and PEC number while temperature profile only increases heat transfer without any change in PEC number. Similar numerical analysis for the case without the flexible plate is also carried out to be compared to that with flexible plate. The results show that adding the flexible plate behind the stationary cylinder decreases the amplitude of lift coefficient 86%, the frequency of vortex shedding 35.8%, and total pressure loss 31.1%. The average Nusselt number is also improved by 2.3% and eventually, PEC increases by 23%.