Heat Transfer Characteristics of the Interaction Between Bulk Flow Pulsation and a Vortex Embedded in a Turbulent Boundary Layer

- Journal title : Transactions of the Korean Society of Mechanical Engineers B
- Volume 25, Issue 3, 2001, pp.381-388
- Publisher : The Korean Society of Mechanical Engineers
- DOI : 10.22634/KSME-B.2001.25.3.381

Title & Authors

Heat Transfer Characteristics of the Interaction Between Bulk Flow Pulsation and a Vortex Embedded in a Turbulent Boundary Layer

Gang, Sae-Byeol; Maeng, Du-Jin; Lee, Jun-Sik;

Gang, Sae-Byeol; Maeng, Du-Jin; Lee, Jun-Sik;

Abstract

Presented are heat data which describe the effect of interaction between bulk flow pulsations and a vortex embedded in a turbulent boundary layer. The pulsation frequencies are 3 Hz, 15 Hz and 30 Hz. A half delta wing with the same height as the boundary layer thickness is used to generate the vortex flow. The convection heat transfer coefficients on a constant heat-flux surface are measured by embedded 77 T-type thermocouples. Spanwise profiles of convection heat transfer coefficients show that upwash region of vortex flow is influenced by bulk flow pulsations. The local heat transfer coefficient increases approximately by 7 percent. The increase in the local change of convection heat transfer coefficient is attributed to the spanwise oscillatory motion of vortex flow especially at the low Strouhal number and to the periodic change of vortex size.

Keywords

Vortex;Heat Transfer Coefficient;Flow Pulsation;Phase Average;

Language

Korean

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