Flow control for drag and scalar transfer
Reduction of the fluid resistance is always important with respect to the cost and environment. Transport of the scalar (such as heat and chemical species) should be enhanced or prohibited depending on the engineering application. Thus, several ways to control the momentum and scalar have been investigated.
Drag reduction
Turbulent flows of the non-Newtonian fluid in complex geometry
FENE-P model for the viscoelasticity
Geometry effect on the drag reduction of the non-Newtonian fluid flows
Related papers: Lee et al. (in preparation)
Superhydrophobicity in turbulent channel flow
The Reynolds number dependency on the drag reduction regarding the large-scale motion
Longitudinal patterns of the superhydrophobic surface
Related papers: Lee et al. (FTC 2015), Yoon et al. (IJHFF 2016)
Temperature-dependent viscosity in turbulent boundary layer
Mechanism of the drag reduction by decreasing the fluid viscosity
Stabilized flows with enhanced dissipation and weakened outer turbulent structures
Related papers: Lee et al. (JFM 2013)
Heat Transfer
Turbulent thermal boundary layer with temperature-dependent viscosity
The effect of inhomogeneous Reynolds number due to the temperature-dependent viscosity
Accelerated scalar transfer at the wall when the viscosity of liquid drops by wall heating
Related papers: Lee et al. (IJHFF 2014)