Explanation

It refers to dispersing metal or non-metallic nanosized powder into heat exchange media such as water, alcohol and oil to prepare new heat exchange media with uniform, stable and high thermal conductivity. This is an innovative research on the application of nanotechnology in the field of thermal engineering. Compared with pure liquids, nanofluid have higher thermal conductivity and are easier to suspend in the base liquid than micron or millimeter sized solid particles. The preparation methods of nanofluid include one-step method and two-step method. One step method is to complete the preparation of nanoparticle and the dispersion of nanoparticle in the base solution at the same time. The two-step method is to disperse the prepared nanoparticle into the base solution by some means, and the preparation and dispersion process is divided into two steps. Due to the complex one-step preparation process, expensive equipment, and lack of mass production capacity, the two-step method is mainly used to prepare nanofluid at this stage. nanoparticle in nanofluid are easy to self assemble, and nanoparticle will precipitate from the base solution. The problem to be solved in the two-step preparation is the dispersion stability of particles in the base solution. Long nanofluid have great potential applications in energy, chemical industry, automobile, architecture, microelectronics, information and other fields, and become a research hotspot in materials, physics, chemistry, heat transfer and other fields.

Classification