期刊
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
卷 80, 期 -, 页码 -出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.ijheatfluidflow.2019.108480
关键词
Rotating flow; Turbulence; Heat transfer; Channel flow; Direct numerical simulation
资金
- Natural Sciences and Engineering Research Council (NSERC) of Canada
Investigations into the characteristics of turbulent heat transfer and coherent flow structures in a plane-channel subjected to wall-normal system rotation are conducted using direct numerical simulation (DNS). In order to investigate the influence of system rotation on the temperature field, a wide range of rotation numbers are tested, with the flow pattern transitioning from being fully turbulent to being quasilaminar, and eventually, fully laminar. In response to the Coriolis force, secondary flows appear as large vortical structures, which interact intensely with the wall shear layers and have a significant impact on the distribution of turbulence kinetic energy (TKE), turbulence scalar energy (TSE), temperature statistics, and turbulent heat fluxes. The characteristic length scales of turbulence structures responsible for the transport of TSE are the largest at the quasilaminar state, which demands a very large computational domain in order to capture the two-dimensional spectra of temperature fluctuations. The effects of the Coriolis force on the turbulent transport processes of the temperature variance and turbulent heat fluxes are thoroughly examined in terms of their respective budget balances.
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