eprintid: 10187018
rev_number: 8
eprint_status: archive
userid: 699
dir: disk0/10/18/70/18
datestamp: 2024-02-13 13:46:26
lastmod: 2025-01-10 07:10:13
status_changed: 2024-02-13 13:46:26
type: article
metadata_visibility: show
sword_depositor: 699
creators_name: Klettner, CA
title: Forced convection past a circular cylinder in a planar Poiseuille flow
ispublished: pub
divisions: UCL
divisions: B04
divisions: C05
divisions: F45
keywords: Forced convection, Hele-Shaw flow
note: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
abstract: In this work the transfer of a passive scalar (temperature) from a circular cylinder (radius R) in a planar Poiseuille flow (height
2h) is investigated with numerical simulations. The study varies the channel half-height to cylinder radius ϵ = h/R, the inertial
parameter Λ = (UcR/ν)(h/R)
2
and the Peclet number ´ Pe = UcR/α, where Uc is the midplane velocity, ν is the kinematic viscosity
and α is the thermal diffusivity. There has been significant amount of work for ϵ ≫ 1, therefore this work will focus on the range,
0.03 ≤ ϵ ≤ 1, which has been chosen to show the effect of geometry and inertia on the flow features and the subsequent transfer.
As ϵ is decreased the Nusselt number increases and this behaviour is explained with velocity and temperature profiles.
Particularly for ϵ = 0.03, the local Nusselt number has a significant vertical variation (in the z-direction) when Λ and Pe are
increased past certain values. For Λ ≪ 1 and Pe > 103
this is due to the non-uniform incident flow present in the Hele-Shaw
cell while for Λ = O(1), it is the secondary flow that is induced at the sides of the cylinder. For these latter flows the transfer in
the midplane is reduced relative to near the side walls, due to the triple turning point radial velocity profile adjacent to the circular
cylinder. For Λ ≤ 1, the Nusselt number is only a function of Pe. However, for Λ > 1, the secondary flow results in a slightly
increased Nusselt number.
date: 2024-02
date_type: published
publisher: Elsevier BV
official_url: http://dx.doi.org/10.1016/j.ijheatfluidflow.2023.109262
oa_status: green
full_text_type: other
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 2244820
doi: 10.1016/j.ijheatfluidflow.2023.109262
lyricists_name: Klettner, Christian
lyricists_id: CKLET21
actors_name: Klettner, Christian
actors_id: CKLET21
actors_role: owner
full_text_status: public
publication: International Journal of Heat and Fluid Flow
volume: 105
article_number: 109262
issn: 0142-727X
citation:        Klettner, CA;      (2024)    Forced convection past a circular cylinder in a planar Poiseuille flow.                   International Journal of Heat and Fluid Flow , 105     , Article 109262.  10.1016/j.ijheatfluidflow.2023.109262 <https://doi.org/10.1016/j.ijheatfluidflow.2023.109262>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10187018/1/Klettner_convection.pdf