Turbulent structures and budgets behind permeable ribs
Panigrahi, Pradipta Kumar and Schröder, Andreas and Kompenhans, Jürgen (2007) Turbulent structures and budgets behind permeable ribs. Experimental Thermal and Fluid Sciences (32), pp. 1011-1033. ELSEVIER. DOI: 10.1016/j.expthermflusci.2007.11.019.
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Different rib geometries are traditionally used to improve heat transfer and enhance mixing in different industrial applications i.e. heat exchangers, cooling passages of gas turbine blades and fuel elements of nuclear reactors etc. Permeable ribs have been proposed in literature for passive control of the reattaching flow past surface mounted ribs leading to superior performance. The flow past different surface mounted permeable rib geometries i.e. solid, slit, split-slit and inclined split-slit ribs have been investigated in this study. Both two-component and stereo Particle image velocimetry (PIV) have been used in streamwise and cross stream planes to study the underlying flow structures. The detailed turbulent statistics i.e. mean and rms velocity, higher order moments, quadrant decomposition of turbulent shear stress producing motions, skewness and components of the turbulent kinetic energy budgets have been compared for different rib geometries. The reattachment length of the inclined split-slit rib is lowest among all rib geometries. The average Reynolds stresses and the production of turbulent kinetic energy are highest for the inclined split-slit rib. The pressure transport calculated as residual of the turbulent kinetic energy budget equation is highest for the inclined split-slit rib. This is attributed to the smaller reattachment length leading to greater adverse pressure gradient for the inclined split-slit rib. The quadrant motions, turbulent fluxes, skewness and kinetic energy budgets at post reattachment region compares well with that of flat plate turbulent boundary layer from hot wire measurements in literature. Overall, this study demonstrates the effectiveness of PIV technique for the detailed turbulent structures characterization of complex flows.
|Additional Information:||2nd Review|
|Title:||Turbulent structures and budgets behind permeable ribs|
|Journal or Publication Title:||Experimental Thermal and Fluid Sciences|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 1011-1033|
|Keywords:||PIV, Rib, Skewness, Coherent structures, Quadrant analysis, Wavelet, Kinetic energy Budget|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||L AR - Aircraft Research|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L AR - Aircraft Research|
|DLR - Research theme (Project):||L - Flight Physics|
|Institutes and Institutions:||Institute of Aerodynamics and Flow Technology > Experimental Methods|
|Deposited By:||Ilka Micknaus|
|Deposited On:||07 Apr 2008|
|Last Modified:||15 Jan 2010 01:59|
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