关键词：磁性纳米流体；悬浮液；热导率
摘 要：Magnetic nanofluids are suspensions of nanometer sized magnetic particles stabilized aginst agglomeration and sedimentation. The uniqueness of magnetic nanofluid is that its properties and the location can be easily controlled by an external magnetic field, which is being exploited for many scientific, industrial, and commercial applications. During the search for superior coolants with better heat transfer efficiencies, it was found that magnetic nanofluids can produce a dramatic thermal conductivity enhancement (＞ 300%) due to the efficient transport of heat through the percolating nanoparticle paths. It has also been demonstrated that the field-induced thermal conductivity enhancement can be precisely and reversibly tuned from a low to very high value by varying the magnetic field strength and its orientation. Since the application of magnetic field enhances not only the thermal conductivity but also the rheological properties of the magnetic nanofluid, they find applications in smart cooling cum damping devices. This chapter summarizes the recent research on thermal conductivity of magnetic nanofluids. The effects of volume fraction, magnetic field strength, nanoparticle size, temperature, base fluid material, aggregation and additives on thermal conductivity of magnetic nanofluids are discussed in detail.
内 容：