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Tubes with Heat Transfer Property Intensified by Multi-longitudinal Vortices According to the Field Coordination Theory

MENG Ji-an, GUO Zeng-yuan, LI Zhi-xin (College of Aeronatuics, Tsinghua University, Beijing 100084, China)  
Two kinds of tubes with heat trasnsfer properties, intensified by multi-longitudinal vortices, i.e. tubes with discrete double inclined ribs(DDIR) and with alternating elliptical axes(AEA), have been developed and their physical mechanism of heat transfer intensification analyzed. Numerical simulation and experimental results show, that in the range of Re=500-2300, heat transfer in DDIR tubes is raised by 250%-650%, with flow resistance increased by 120%-300%, while in AEA tubes their respective increase is 200%-500%, and 100%-350%, compared to circular tubes (L/D=300) with entrance effect included; in the range of Re=2300-5×10~4, as comparedwith circular tubes, the increase of heat transfer is 110%-240% and that of flow resistance 120%-240% in DDIR tubes while in AEA tubes the respective increase is 35%-170% and 130%-160%. The performance of these two kinds of tubes with intensified heat transfer property is excellent and there may be a broad field of application in the power, petrochemical and building industry for heating purposes. Fig 7, ref 10。
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