The difference in the thermal conductivity of nanofluids measured by different methods and its rationalization

Beilstein Journal of Nanotechnology

Aparna Zagabathuni¹  Shyamal Kumar Pabi¹  Sudipto Ghosh¹ 

[1] Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, West Bengal-721302, India;

关键词: Brownian movement;    collision-mediated heat transfer model;    laser flash method;    nanofluids;    thermal conductivity;    transient hot-wire method;   

DOI  :  10.3762/bjnano.7.194

来源: DOAJ

【 摘 要 】

A suspension of particles below 100 nm in size, usually termed as nanofluid, often shows a notable enhancement in thermal conductivity, when measured by the transient hot-wire method. In contrast, when the conductivity of the same nanofluid is measured by the laser flash method, the enhancement reported is about one order of magnitude lower. This difference has been quantitatively resolved for the first time on the basis of the collision-mediated heat transfer model for nanofluids proposed earlier by our research group. Based on the continuum simulation coupled with stochastic analysis, the present theoretical prediction agrees well with the experimental observations from different measuring methods reported in the literature, and fully accounts for the different results from the two measuring methods mentioned above. This analysis also gives an indication that the nanofluids are unlikely to be effective for heat transfer in microchannels.

【 授权许可】

Unknown