A Numerical Study on the Temperature Field of Oscillatory Flow Reactor with Conic Ring Baffles

摘要

In published papers, the experimental researches have been carried out on heat transfer in Oscillatory Flow Reactors(OFRs) with annular baffles in both batch and continuous modes. It's found that even with low net flow rates (or without net flow) the heat transfer properties of OFR can match turbulent pipe flow. But there's no paper shows the micro-structure of temperature field in OFRs to illustrate the heat transfer mechanism. In this paper, we report our 3-dimensional numerical simulation results of heat transfer of OFR with novel conic ring baffles which is particularly suitable for liquid-solid systems. The temperature field of conic baffled OFR was obtained by using the commercial CFD package CFX11.0. It's found that in "soft" mixing region the maximum temperature gradient lies approximately in the middle of each cell, i.e. between the two pairs of vortices. It can be speculated that the convection caused by the intense vortex interaction leads to heat transfer essentially. When it's global mixing, severe bias flow occurs. The temperature field becomes more chaotic and the heat convection is caused by more disordered vortex interaction.