Dynamics of flow and heat transfer around two circular cylinders of different diameters in tandem subjected to forced convection

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Two-dimensional numerical simulations for heated and unheated flows over two circular cylinders of different diameters in tandem are conducted. The study is conducted for Re=150 and temperature ratio 1 ≤ (T = Ts/T) ≤ 2.3. The study is limited to spacing ratios in the range 2 ≤ L/Dd ≤ 8 and diameter ratios 0.5 ≤ Du/Dd ≤ 2. The effect of heating on the flow is captured by modelling the thermophysical properties of the fluid fitted as polynomial functions of temperature. The flow features are visualized by plotting the streamlines and velocity magnitude contours. These flow patterns are also discussed based on the reattachment and co-shedding regimes which are classification found in literature. The effect of varying geometrical parameters on the flow in terms of change of regime is discussed. Furthermore, the drag coefficient (Cd) on both upstream and downstream cylinders is presented as a function of spacing and diameter ratios. Additionally, the average surface heat transfer coefficient (h) is presented for the interval of spacing and diameter ratios stated. Results show that the presence of an upstream cylinder led to reduction of Cd on the downstream cylinder to a value lower than that of single cylinder for all cases studied. Heating both cylinders causes Cd on both cylinders to become less sensitive to a change in L/Dd, and increasing Du/Dd is found to decrease h on both upstream and downstream cylinders.

Original languageBritish English
Title of host publicationDynamics, Vibration, and Control
ISBN (Electronic)9780791885611
DOIs
StatePublished - 2021
EventASME 2021 International Mechanical Engineering Congress and Exposition, IMECE 2021 - Virtual, Online
Duration: 1 Nov 20215 Nov 2021

Publication series

NameASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
Volume7A-2021

Conference

ConferenceASME 2021 International Mechanical Engineering Congress and Exposition, IMECE 2021
CityVirtual, Online
Period1/11/215/11/21

Keywords

  • Diameter ratio
  • Different diameter
  • Drag coefficient
  • Forced convection
  • Spacing ratios
  • Tandem cylinders

Fingerprint

Dive into the research topics of 'Dynamics of flow and heat transfer around two circular cylinders of different diameters in tandem subjected to forced convection'. Together they form a unique fingerprint.

Cite this