Effect of surface tension on SiO2 -methanol nanofluids

7th International Conference on Cooling & Heating Technologies

材料科学;物理学

Bhuiyan, M.H.U.^1 ; Saidu, R.^1 ; Amalina, M.A.^1 ; Mostafizur, R.M.^1

Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur

50603, Malaysia^1

关键词: Cohesive energies;    Heat transfer performance;    Methanol solution;    Pure methanols;    Ring method;    SiO2 Nanoparticles;    Temperature changes;    Thermo-physical property;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/88/1/012056/pdf
DOI  :  10.1088/1757-899X/88/1/012056

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Surface tension, the cohesive energy of an interface dominated the transportation behaviour of the liquids play an important role in the heat transfer performance. A new class of heat transfer fluid denoting "Nanofluids" with impressive thermo-physical properties, proved its promising potentiality in the heat transfer performance. However, very few numbers of studies observed for the effect of nanoparticles on the surface tension of liquids, also noted controversial results. In the present study, SiO2 nanoparticles dispersed in methanol solution to investigate the effect of surface tension with the change of concentration and their sizes. The most common Du: Noüy ring method was used to measure the surface tension of methanol based nanofluids by an automatic surface tensiometer.The results denote that the surface tension of the nanofluids increases with increase in concentration. On the other hand, the results indicate that the surface tension decreases with the increase in temperatures. Besides, the surface tension of SiO2-methanol nanofluids enhances compared to pure methanol. All in all, the enhancement observed 1.7% to 8.9% of the variation of volume fractions (0.05 Vol % to 0.25 Vol %) and the temperature change of 25 °C to 50 °C.