使用有限元分析方法对磁场作用下Fe3O4-水纳米流体在圆形通道内流动及传热过程进行了三维数值模拟,研究了平行磁场作用下入口温度和流速对通道内 Fe3O4-水纳米流体流动及传热性能的影响.结果表明:随着入口温度的不断提高,传热系数也在不断提高,当入口温度由 293 K 上升至313 K,传热系数提升达到11.6%,但也同时造成了流动阻力的增加.在研究范围内,雷诺数的增大在入口温度低于 303 K时对传热起到了先抑制后增强的效果,而当入口温度达到 303 K以上后,雷诺数增大仅会抑制传热.
Study on Flow and Heat Transfer of Fe3O4 Nanofluid in a Circular Tube Under Magnetic Field
The flow and heat transfer process of Fe3O4-water nano-fluid in a circular channel under the action of magnetic field was simulated by Using finite element analysis method.The effects of inlet temperature and flow rate on the flow and heat transfer performance of Fe3O4-water nano-fluid in the channel under the action of parallel magnetic field were studied.The results showed that the heat transfer coefficient was also increasing with the increase of inlet temperature.When the inlet temperature rose from 293 K to 313 K,the heat transfer coefficient increased to 11.6%,but it also caused the increase of flow resistance.In the study range,the increase of Reynolds number had the effect of first inhibiting and then enhancing the heat transfer when the inlet temperature was lower than 303 K,while when the inlet temperature reached above 303 K,the increase of Reynolds number would only inhibit the heat transfer.
Magnetic nanofluidHeat transfer enhancementNumerical simulationFlow resistance
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