Heat transfer and friction factor of composite TiO2_SiO2 nanofluids in water-ethylene glycol (60:40) mixture

4th International Conference on Mechanical Engineering Research

Nabil, M.F.^1 ; Azmi, W.H.^1,2 ; Hamid, K.A.^1 ; Mamat, R.^1,2

Faculty of Mechanical Engineering, Universiti Malaysia Pahang, Pekan, Pahang

26600, Malaysia^1

Automotive Engineering Centre, Universiti Malaysia Pahang, Pekan, Pahang

26600, Malaysia^2

关键词: Bulk temperatures;    Constant heat flux;    Experimental determination;    Friction factors;    Heat transfer and friction factors;    Heat transfer rate;    Two step method;    Volume concentration;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/257/1/012066/pdf
DOI  :  10.1088/1757-899X/257/1/012066

来源: IOP

【 摘 要 】

The need for high performance of heat transfer has been evaluated by finding different ways to enhance heat transfer rate in fluid. One of the methods is the combination of two or more nanoparticles and it is known as hybrid/composite nanofluids which can give better performance of heat transfer. Thus, the present study focused on combination of Titanium oxide (TiO2) and Silicon oxide (SiO2) nanoparticles dispersed in 60:40 volume ratio of water and ethylene glycol mixture as the base fluid. The TiO2-SiO2hybrid nanofluids are prepared using two-step method for different concentration of 2.0%, 2.5% and 3.0%. The experimental determination of heat transfer coefficients are conducted in the Reynolds numbers range from 2000 to 10000 at a bulk temperature of 30°C. The experiments are undertaken for constant heat flux in a circular tube. The Nusselt number of composite TiO2- SiO2nanofluids is observed to be higher than the base fluid. The finding on heat transfer coefficient shows that 3.0% volume concentration is the highest enhancement with 45.9% compared with base fluid. While at concentration 2.0% and 2.5%, the enhancement recorded were 29.4% and 33.2%, respectively. The friction factor of nanofluids shows a decreased with the increasing of Reynolds numbers. However, the friction factor slightly increased with the increased of concentration.