标题： 纳米流体剪切流动中的传热分析模型 显示英文标题

标题： Analytical modeling for the heat transfer in sheared flows of nanofluids

摘要： 我们开发了一个模型，用于增强剪切层流纳米流体中的球形和伸长纳米颗粒的热通量。 除了由纳米颗粒携带的热通量外，该模型还考虑了其旋转对颗粒内部和外部热通量的贡献。 纳米颗粒的旋转具有双重效应，它会在颗粒周围引起流体对流，并强烈影响颗粒取向的统计分布。 这些动态效应未包含在现有的热模型中，它们导致流动流体的热性能与静止流体相比发生了变化。 所提出的模型得到了大量数值模拟的强烈支持，表明热通量的潜在增加远超过球形纳米颗粒的Maxwell-Garnet极限。 讨论了通往稳健预测热通量增强模型的道路。 显示英文摘要

摘要： We developed a model for the enhancement of the heat flux by spherical and elongated nano- particles in sheared laminar flows of nano-fluids. Besides the heat flux carried by the nanoparticles the model accounts for the contribution of their rotation to the heat flux inside and outside the particles. The rotation of the nanoparticles has a twofold effect, it induces a fluid advection around the particle and it strongly influences the statistical distribution of particle orientations. These dynamical effects, which were not included in existing thermal models, are responsible for changing the thermal properties of flowing fluids as compared to quiescent fluids. The proposed model is strongly supported by extensive numerical simulations, demonstrating a potential increase of the heat flux far beyond the Maxwell-Garnet limit for the spherical nanoparticles. The road ahead which should lead towards robust predictive models of heat flux enhancement is discussed.