黏弹性纳米流体湍流对流换热直接数值模拟

Direct Numerical Simulation on Turbulent Convective Heat Transfer of Viscoelastic-Fluid-Based Nanofluids

采用直接数值模拟方法,对黏弹性流体基纳米流体湍流在稳定加热的平板槽道区域中进行计算。假设流体为单相,利用实验数据拟合得到的公式计算流体的流变学参数,黏弹性流体网状结构和溶剂的相互作用采用Giesekus模型实现。假设温度为被动标量,对速度场无影响。计算结果显示黏弹性纳米流体具有湍流减阻效果,且与黏弹性流体基液相比,增强了换热效果。

Direct numerical simulations of a turbulent heat transfer in a channel flow with a Giesekus model have been carried out to investigate the characteristics of turbulent heat transfer of a viscoelastic-fluid-based nanofluids flow. The fluid was assumed as single phase and temperature was considered as a passive scalar. Compared to the viscoelastic base fluid flow, the heat transfer enhancement for the viscoelastic-fluid-based nanofluids was obtained.