2023/02/02 by Amarjit Haty, Rajendra K. Ray, Haty, Amarjit +3
Engineering · #FOS: Mathematics #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #Fluid Dynamics and Turbulent Flows #Fluid Dynamics and Vibration Analysis #Nanofluid Flow and Heat Transfer #Numerical Analysis (math.NA)
paper · pdf · doi:10.48550/arxiv.2302.01370
openalex publication_date 2023/02/02 · openalex created_date 2023/02/08 · openalex updated_date 2026/07/28
The main objective of this paper is to study the effect of a cold, vertical, arc-shaped control plate on the flow characteristics and forced convective heat transfer mechanism across a rotary oscillating, isothermally heated circular cylinder. Two-dimensional, unsteady, incompressible, laminar, and viscous flow of a Newtonian, constant property fluid is considered across the cylinder. The simulations are performed with an in-house code for various gap ratios between the control plate and the cylinder (0≤ d/R0 ≤ 3), maximum angular velocity (0.5≤ αm ≤ 4) and frequency ratio of oscillation (f/f0=0.5, 3) at Prandtl number 0.7 and Reynolds number 150. Here, d denotes the gap between the surface of the cylinder and the leading surface of the control plate, R0 denotes the radius of the cylinder, f is the frequency of oscillation and f0 is the frequency of natural vortex shedding. d/R0=0 corresponds to the no plate case. Heat transfer and vortex shedding phenomena are discussed in relation to one another. A significant increase in heat transmission is observed for all αm with the gap ratio of d/R0=0.5 and f/f0=0.5. The heat absorption on the surface of the control plate decreases to zero with increasing gap ratio when αm=0.5 and f/f0=0.5 but never becomes zero when αm=4 and f/f0=3. Additionally, when compared to the no plate case with (αm, f/f0)=(0.5, 0.5), the maximum peak of the drag coefficient is decreased by 9.877% for the gap ratio of d/R0=3. For αm=4 and f/f0=3, the smallest gap ratio of d/R0=0.5 is found to significantly increase the lift coefficient relative to other cases.