ANALYSIS OF CORNER RADIUS ON THE FREE OSCILLATING CYLINDER WITH HEAT TRANSFER AND FLOW PATTERN AT LOW REYNOLDS NUMBER

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Abstract

Flow-induced vibration (FIV) of the modified single-cylinder with a change in corner radius has been investigated in a laminar flow regime with Re=100 and Pr=0.7. The corner radius (r: corner radius,:R cylinder characteristic length) is changed from 1 to 0 and two angles α ; 0° and 45º are used. The Cylinder is elastically supported with heating at a constant temperature at the boundaries. Vibrations are restricted to the transverse direction. Computation is carried out with a fixed mass ratio ∗ 10 m = and varying reduced velocity Ur = 2 ~8 . The two-dimensional incompressible Navier-Stokes equations and energy equations are coupled together. Navier stokes equation used with FIV equation of elastically supported cylinder to have flow solutions. Lock-in synchronization can be observed at 5 Ur = and Re=100 at ∗ 1 r = which leads to severe vibration and maximum vibrational amplitude A D while amplitude modulation has been observed at 5 Ur = for the square cylinder. Based on the mode of vibration whole study has been divided into 4 ranges of vibration. Mode-I, where the amplitude is very low; Mode-II, fluctuating amplitude known as hysteresis (Beating); Mode-III; amplitude is at the maximum because of lock-in synchronization; Mode-IV, normal vibrational amplitude. Different modes are compared with the change in Ur , ∗ r and α. The effect of Ur is visible on the Nusselt number as more vibration leads to a high value of averaged Nusselt number Avg Nu . Vortex shedding is changed from C(2S) to 2S as the corner radius is modified. Results give a deep insight into heat transfer getting changed by changing three different parameters and will make a base for future study of tube bundles in heat exchangers with FIV.

Original languageBritish English
Title of host publicationProceedings of ASME 2022 Heat Transfer Summer Conference, HT 2022
ISBN (Electronic)9780791885796
DOIs
StatePublished - 2022
EventASME 2022 Heat Transfer Summer Conference, HT 2022 - Philadelphia, United States
Duration: 11 Jul 202213 Jul 2022

Publication series

NameProceedings of ASME 2022 Heat Transfer Summer Conference, HT 2022

Conference

ConferenceASME 2022 Heat Transfer Summer Conference, HT 2022
Country/TerritoryUnited States
CityPhiladelphia
Period11/07/2213/07/22

Keywords

  • Finite element method
  • FIV
  • Flow over cylinder
  • Heat exchangers
  • Heat transfer
  • Unsteady flows

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