Author/Authors :
Wongwises Somchai نويسنده , Hemmat Esfe Mohammad نويسنده Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Isfahan, Iran , Rostamian Seyed Hadi نويسنده Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Isfahan, Iran , Afrand Masoud نويسنده Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
Abstract :
در اين مطالعه، به اثرات نانولوله چند ديواره كربني و درجه حرارت بر رفتار ريولوژيك روغن موتور (10W40) پرداخته شده است. براي اين منظور، آزمايش در محدوده دماي 55-5 درجه سانتي گراد براي چند سوسپانسسيون مختلف با كسر حجمي جامد 0.025? ، 0.05? ، 0.1? ، 0.25? ، 0.5? و 0.75? انجام شد. ويسكوزيته تمام نمونه ها در محدوده نرخ برشي 666s-1-13333 S-1 براي تمام درجه حرارت مورد بررسي اندازه گيري شد. اندازه گيري ويسكوزيته در نرخ برشي مختلف نشان داد كه تمام نمونه نانوسيال رفتار غير نيوتني را نشان داد. نتايج همچنين نشان داد كه با افزايش كسر حجمي جامد 0-0.75?، ويسكوزيته هم افزايش تا 2.5 برابري نشان مي دهد.
واژگان كليدي: نانوسيال غير نيوتوني، روغن موتور، نانولوله كربني چند ديواره، مطالعات آزمايشگاهي
Abstract :
In this study, efects of multi walled carbon nanotubes and temperature
on rheological behavior of engine oil (10W40) have been examined. For
this purpose, the experiments were carried out in the temperature range
of 5-55°C for several suspensions with solid volume fractions of 0.025%,
0.05%, 0.1%, 0.25%, 0.5% and 0.75%. Te viscosity of all samples was
measured in the shear rate range of 666s-1
to 13333 s-1
at all temperatures
considered. Te viscosity measurements at diferent shear rates revealed
that all nanofuid samples showed non-Newtonian behavior. Te results also
revealed that for an increase in the solid volume fraction from 0 to 0.75%,
the viscosity increases to 2.5 times. Te consistency and the power law index
were attained by curve-ftting method for all samples and temperatures.
Furthermore, the curve-ftting results revealed that the consistency index
and apparent viscosity of nanofuid increases with augmenting the solid
volume fraction and diminishes with growing temperature.
