Direct numerical simulation of three-dimensional (3D) viscous flow in a wavy pipe is performed using the lattice Boltzmann approach, to study 3D flow features in a curved pipe with nonuniform curvature. We first validate the lattice Boltzmann approach by simulating a transient flow in a straight pipe. In a wavy pipe, it is shown that the pressure gradient necessary to drive the flow depends mor...

While Reynolds-averaged Navier-Stokes (RANS) simulations remain the most affordable technique for simulating complex turbulent flows, the inability of linear eddy viscosity models to correctly predict flow separation and reattachment limits the reliability of the simulation outcome. A methodology to quantify the uncertainty in the simulation outcome related to the form of the turbulence model u...

The mixing of transported scalars in turbulent flows is a classic topic in turbulence research. The “diffusing power” of turbulent flows was originally recognized, among others, by Taylor (1915) since the beginning of the last century. Later on, Taylor (1921, 1935) also provided the first statistical framework to predict turbulent diffusion in air streams, as well as the scalar mixing in pipe f...

Various micropatterns have been fabricated and used to regulate cell adhesion, morphology and function. Micropatterns created by standard photolithography process are usually rectangular channels with sharp corners (microgrooves) which provide limited control over cells and are not favorable for cell-cell interaction and communication. This paper proposes a new micropattern with smooth wavy sur...

Direct numerical simulation was used to study laminar and turbulent flows in circular pipes with smoothly corrugated walls. The corrugation wavelength was kept constant at 0.419D, where D is the mean diameter of the wavy-wall pipe and the corrugation height was varied from zero to 0.08D. Flow rates were varied in steps between low values that generate laminar flow and higher values where the fl...

The purpose of this study is to investigate the behaviour natural convection in a wavy trapezoidal enclosure that filled with nanofluid. left wall has wavelength, l, and amplitude, A. top bottom walls are adiabatic while side set constant temperature, shear stress occurs at enclosure. numerical approach used order discretize governing equations its boundary conditions finite element method wher...

A novel wavy-walled bioreactor designed to enhance mixing at controlled shear stress levels was used to culture chondrocytes in suspension. Chondrocyte aggregation in suspensions mixed at 30, 50, and 80 rpm was characterized in the wavy-walled bioreactor and compared with that in conventional smooth-walled and baffled-walled spinner flask bioreactors. Aggregation was characterized in terms of t...

The two-dimensional, time-independent conjugate natural convection flow and entropy generation are numerically investigated in three different cases of a wavy conducting solid block attached to the left wall square cavity. A hybrid nanofluid with titania (TiO2) copper (Cu) nanoparticles base fluid water part is considered presence uniform inclined magnetic field. leftmost cavity hot one rightmo...

Heat management is crucial to the stable and high-efficiency operation of proton exchange membrane fuel cell (PEMFC) system. However, fin-tube heat exchangers (FTHE) traditional internal combustion engine vehicles require further optimizations be applicable PEMFC vehicles. In paper, a three-dimensional steady-state radiator model developed in OpenFOAM investigate three novel structural designs ...