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New insight into the contribution of the microscale vortex evolution towardsconvection heat transfer in porous media is presented in this paper. Theobjective is to determine how the microscale vortices influence convection heattransfer in turbulent flow inside porous media. The microscale temperaturedistribution is analyzed using flow visualization in 2D using streamlines andin 3D using Q structures. The pertinent observations are supplemented with thecomparison of surface skin friction and heat transfer using: (1) surface skinfriction lines and (2) joint PDF of pressure and skin friction coefficients,along with the Nusselt number. The microscale flow phenomena observed arecorroborated with the features of the frequency spectra of the drag coefficientand macroscale Nusselt number. The Large Eddy Simulation technique is used toinvestigate the flow field inside a periodic porous medium. The Reynoldsnumbers of the flow are 300 and 500. The porous medium consists of solidobstacles in the shape of square and circular cylinders. Two distinct flowregimes are represented by using the porosities of 0.50 and 0.87. The resultsshow that the surface Nusselt number distribution is dependent on whether themicro-vortices are attached to or detached from the surface of the obstacle.The spectra of the macroscale Nusselt number and the pressure drag are similarsignifying a correlation between the dynamics of heat transfer and themicroscale turbulent structures. Both vortex shedding and secondary flowinstabilities are observed that significantly influence the Nusselt number. Thefundamental insight gained in this paper can inform the development of morerobust macroscale models of convection heat transfer in turbulent flow inporous media.

The Evolution of Turbulent Micro-vortices and their Effect on Convection Heat Transfer in Porous Media