摘要
讨论纳米颗粒悬浮液的稳定性问题.对不同颗粒、不同基液制备的悬浮液稳定性进行了实验研究,在此基础上,探讨颗粒与基液的密度、颗粒的等效直径、基液动力粘度等因素对悬浮液稳定性的影响.结果表明:颗粒等效直径与基液动力粘度对悬浮液的稳定有决定性作用.
Due to the increasing development of nanotechnology and its practical applications, the thermal conductivity of a nanoparticle suspension is becoming a frontier of nanofluid and its application in enhancing heat transfer. It is highly expected that the addition of nanoparticles can significantly enhance the conductivity of the liquid without clogging, erosion, sedimentation and increase in pressure drop, which usually are encountered in common particle suspensions. However, the stability of nanoparticle suspension is not still as good as expected in practical experiments. Available investigations indicate that the stability can be improved choosing proper combination of nanoparticle and base fluid. In this paper, a series of experimental investigations are conducted to observe the stability of nanoparticle suspensions with different combinations of nanoparticles and base fluids. Experimental evidences demonstrate the influence of particle geometrical and physical properties, fluid properties, particularly viscosity on the stability. The most important factors for the stability of nanoparticle suspensions are effective diameter of nanoparticle cluster and viscosity of base fluids. Decreasing the effective diameter of nanoparticle cluster and increasing the viscosity of base fluids can significantly increase the stability of nanoparticle suspension.
出处
《应用基础与工程科学学报》
EI
CSCD
2003年第2期167-173,共7页
Journal of Basic Science and Engineering
基金
国家自然科学基金资助项目(编号:59995550 3)
