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Enhancing radial temperature uniformity and boundary layer development in viscous Newtonian and non-Newtonian flow by transverse oscillations: A CFD study

Radial heat transfer in laminar pipe flow produces radially a non-uniform temperature distribution. We use a validated CFD model to show for the first time that the superimposition of a transverse oscillatory motion on the steady laminar flow of a viscous Newtonian or non-Newtonian fluid, generates sufficient chaotic fluid motion which leads to considerable radial mixing and, thus, much better temperature uniformity. This also causes rapid development of the temperature profile axially, thus, reducing the thermal entrance length by a large factor. A new PhD project is now looking at exploiting this idea in continuous food processing.