Improving the heat transfer efficiency of synthetic oil with silica nanoparticles

被引:112
作者
Timofeeva, Elena V. [1 ]
Moravek, Michael R. [2 ]
Singh, Dileep [2 ]
机构
[1] Argonne Natl Lab, Div Energy Syst, Argonne, IL 60439 USA
[2] Argonne Natl Lab, Nucl Engn Div, Argonne, IL 60439 USA
关键词
Heat transfer fluid; Synthetic oil; Therminol; Nanofluid; Silica; Silicon oxide; Nanoparticles; Surfactant; Thermal conductivity; Viscosity; Total heat; Heat transfer efficiency; Cationic surfactant; Benzalkonium chloride; THERMAL-CONDUCTIVITY; NANOFLUIDS; TEMPERATURE; VISCOSITY; STABILITY; AGGREGATION; ENHANCEMENT;
D O I
10.1016/j.jcis.2011.08.004
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The heat transfer properties of synthetic oil (Therminol 66) used for high temperature applications was improved by introducing 15 nm silicon dioxide nanoparticles. Stable suspensions of inorganic nanoparticles in the non-polar fluid were prepared using a cationic surfactant (benzalkonium chloride). The effects of nanoparticle and surfactant concentrations on thermo-physical properties (viscosity, thermal conductivity and total heat absorption) of these nanofluids were investigated in a wide temperature range. The surfactant-to-nanoparticle (SN) ratio was optimized for higher thermal conductivity and lower viscosity, which are both critical for the efficiency of heat transfer. The theological behavior of SiO2/TH66 nanofluids was correlated to average agglomerate sizes, which were shown to vary with SN ratio and temperature. The conditions of ultrasonic treatment were studied and the temporary decrease of agglomerate size from an equilibrium size (characteristic to SN ratio) was demonstrated. The heat transfer efficiencies were estimated for the formulated nanofluids for both turbulent and laminar flow regimes and were compared to the performance of the base fluid. (C) 2011 Elsevier Inc. All rights reserved.
引用
收藏
页码:71 / 79
页数:9
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