Experimental investigation on heat transfer performance of TiO₂ nanofluids in water-ethylene glycol mixture

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• 作者：K. Abdul Hamid^a ; ^{khamisah0301@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; W.H. Azmi^a ; ^{wanazmi2010@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Rizalman Mamat^a ; ^b ; ^{rizalman@ump.edu.my" class="auth_mail" title="E-mail the corresponding author} ; K.V. Sharma^c ; ^{kvsharmajntu@gmail.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Heat transfer ; Nanofluids ; Titanium dioxide ; Water&ndash ; ethylene glycol mixture
• 刊名：International Communications in Heat and Mass Transfer
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：73
• 期：Complete
• 页码：16-24
• 全文大小：1674 K

文摘

The use of nanofluids is essential in heat transfer study due to its effective performance. The performance of nanofluids in mixture based fluids is yet to be explored hence; the study was carried out to provide a wider knowledge and information on heat transfer performance of TiO₂ nanofluids. The forced convection heat transfer is conducted at Reynolds number of 3000 to 24,000 under constant heat flux boundary conditions. The TiO₂ nanofluid is prepared at 0.5 to 1.5% volume concentration and the thermal conductivity and dynamic viscosity were measured for 30 to 70 °C. The heat transfer performance was evaluated at three different bulk temperatures for its heat transfer coefficient and friction factor; 30, 50 and 70 °C. The thermal conductivity and viscosity enhanced with the increase in volume concentration. The heat transfer performance for temperature at 30 °C experienced low enhancement compared to the base fluid when the nanofluid concentration was less than 1.2%. However, at temperatures of 50 and 70 °C for all volume concentrations, the heat transfer performance improved with a value of h′ greater than 1. As the working temperature increased, the enhancement became more noticeable for higher concentrations. The friction factor of TiO₂ nanofluids is slightly increased with the increase of concentration at approximately 1.1 times of base fluid. The performance factor, h′ of the TiO₂ nanofluids is significantly influenced by the thermal properties, concentration, temperature, and Reynolds number.