Mixing and dispersion in a baffled tube for steady laminar and pulsatile flow

We report experimental observations on the dispersion of fluid in horizontal and vertical tubes where periodic baffles and fluid oscillation may be present. Local concentration profile measurements are made both at the centre and wall of the tube. Our observations show that small density differences between the tracer and bulk fluid can significantly modify the expected concentration profiles for unbaffled tubes. When baffles and oscillations are present excellent mixing is achieved across the tube and dispersion data are presented for this type of flow.