Numerical Simulation for Flow and Heat Transfer Characteristics of LTypeChaotic Channel

摘要

In this paper, the author conducted numerical simulation on fluid flow and heat transfer of L-type chaoticchannel with the use of periodic model, compared with common straight channel, analyzed and gained microscopicinformation flow field and temperature field distribution inside channel, researched synergy of flow field and temperaturefield inside channel with the use of synergy principle, and discussed influences of different Re figures on fluid heattransfer and flow inside chaotic channel. Results show that L-type chaotic structure can generated chaotic convectionunder lower flow velocity, which increases disturbing degree of fluid inside channel, so as to promote mixture and heattransfer of cold and heat fluid; synergy degree of velocity and temperature gradient on cross section of chaotic channel isbetter than that of straight channel, and average synergy angles for outlet cross sections of such two channels arerespectively 66.3° and 88.0°; Nu number of L-type chaotic channel increases with the increase of Re. Particularly,increasing range is more obvious at low Reynolds number, but at the same time, friction coefficient inside channel willincrease.