Nano particle deposition phenomena are useful for substrate coating with required material properties and composition of microstructures. On the other hand, when nano particles are ingested in fluid machinery and nano particle deposition occurs on its wall surface, it may cause the increase of energy loss and the inhibition of machine function. Therefore, we need to understand the mechanism of nano particle deposition phenomena deeply. In the presence of temperature gradient, it is necessary to consider thermophores is for nano particle motions. In the present study, we perform numerical simulations of nano particle deposition phenomena in a rectangular duct flow in order to investigate the influences of thermophoresis. We also investigate the time variation of the deposition layer shape and the temperature field. In order to observe the three-dimensional nano particle behaviors, deposition layer growth, and flow field modification, we provide a flat plate mounted on the duct wall to induce a three-dimensional flow. From the numerical results, the large influences of deposition layer on the heat transfer is confirmed. Moreover, we find that, as growing of the deposition layer accumulated on the rectangular duct wall surface, the wall region with high heat transfer disappears around the flat plate.
展开▼
