The interfacial effects on flow and heat transfer on micro/nano scale are discussed in this paper. Dif- ferent from bulk cases where interfaces can be simply treated as a boundary, the interfacial effects are not limi...The interfacial effects on flow and heat transfer on micro/nano scale are discussed in this paper. Dif- ferent from bulk cases where interfaces can be simply treated as a boundary, the interfacial effects are not limited to the interface on a microscale but could extend into a significant, even the whole domain of the flow and heat transfer field when the characteristic size of the domain is close to the mean free path (MFP) of the carriers inside an object. Most of microscale thermal phenomena result from interfa- cial interactions. Any changes in the interactions between the object and boundary particles, such as the force between fluid and solid wall particles, microstructure of interfaces, could affect thermal properties, flow and heat transfer characteristics and hence change thermal conductivity, velocity and temperature profiles, friction coefficient and thermal radiative properties, etc. The properties of nano- structure or flow and heat transfer features of fluid in micro/nanostructures not only depend on them- selves, but also on the interaction with the interface because the interface impact can go deep inside the flow. The same fluid, same channel geometry but different wall materials could have different flow and heat transport characteristics on microscale.展开更多
基金Supported by the National Natural Science Foundation of China (Grant No. 50376025)
文摘The interfacial effects on flow and heat transfer on micro/nano scale are discussed in this paper. Dif- ferent from bulk cases where interfaces can be simply treated as a boundary, the interfacial effects are not limited to the interface on a microscale but could extend into a significant, even the whole domain of the flow and heat transfer field when the characteristic size of the domain is close to the mean free path (MFP) of the carriers inside an object. Most of microscale thermal phenomena result from interfa- cial interactions. Any changes in the interactions between the object and boundary particles, such as the force between fluid and solid wall particles, microstructure of interfaces, could affect thermal properties, flow and heat transfer characteristics and hence change thermal conductivity, velocity and temperature profiles, friction coefficient and thermal radiative properties, etc. The properties of nano- structure or flow and heat transfer features of fluid in micro/nanostructures not only depend on them- selves, but also on the interaction with the interface because the interface impact can go deep inside the flow. The same fluid, same channel geometry but different wall materials could have different flow and heat transport characteristics on microscale.
