摘要
针对纳米流体在凝固过程中因颗粒偏聚造成的性能失效现象,通过理论分析证明了磁场会影响颗粒与固液界面相互作用的机理,理论上给出了可改善纳米流体凝固后的分散性的磁感应强度范围。选用Fe_3O_4-石蜡纳米流体进行了外加磁场的凝固实验,通过测量凝固后颗粒的偏聚区面积,熔化后的黑度,验证了磁感应强度对纳米流体凝固过程分散性的影响。结果表明,40mT磁场作用下,颗粒在固相中的分散性最佳,熔化后的稳定性最好,热循环稳定性最佳。
Nanofluids would get aggregation during the process of solidification,we proved that magnetic field would change the interaction between nanoparticles and solid/liquid interface by theory analysis.We also found the range of magnetic intensity that increase the dispersion stability of Fe_3O_4 nanofluid during solidification.We chose Fe_3O_4/Parraffin nanofluid in the experiment,measure the segregation area,darkness to improve the effect of magnetic field during nanofluid solidification.The result showed that nanoparticles dispersive best under the magnetic intensity of 40 mT,the disperse stability also best after melting
出处
《功能材料》
EI
CAS
CSCD
北大核心
2016年第1期1127-1130,1135,共5页
Journal of Functional Materials
基金
国家自然科学基金资助项目(51376050)
广东省自然科学基金资助项目(S2013020012817)
