CALCULATION OF NANOFLUIDS’ THERMAL CONDUCTIVITIES IN NANOCHANNEL POISEUILLE FLOW BY MOLECULAR DYNAMICS SIMULATION
Understanding of the influences on the heat transport in nanofluids due to nanoscale flow is very important for fundamental researches and engineering applications. In this study the thermal conductivities of Ar-Kr nanofluids confined in a nanochannel with Poiseuille flow are calculated by equilibrium-molecular-dynamics (EMD) simulation through the Green-Kubo formula. The calculation predicts the anisotropic properties of thermal conductivities in flowing nanofluids that the thermal conductivities in the x-direction in which applied an external force are greater than those in the y-direction. For the region of the external force 0.01 > F > 0.008, as the external driving force decreases the thermal conductivities in the x-direction and the y-direction are both increasing. For the region of the external force F<0.008, the thermal conductivities in the x-direction decrease with a decrease in the external force, while those in the y-direction keep a constant value. For better understanding the thermal conductivity variability mechanisms, the influences of the external driving forces on the system configurations and velocity profiles are also revealed. The results show that the fluid atoms become more regular and concentrated with an increase in the external forces. The velocity profile has a higher distribution as the external force increases and starts to appear a flat part in the center of the channel when the external force F=0.1.
Chengzhen Sun Wen-Qiang Lu Jie Liu Bofeng Bai
State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an, Chin College of Physical Sciences, Graduate University of Chinese Academy of Sciences, Beijing, China, 10 State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an, Chin
国际会议
The Ninth Asian Thermophysical Properties Conference(第九届亚洲热物理性能会议 ATPC 2010)
北京
英文
37-43
2010-10-19（万方平台首次上网日期，不代表论文的发表时间）