Investigation of the thermal conductivity, viscosity and mending effect of Cu, CuO and TiO2 nanoparticles in the engine base oil
- سال انتشار: 1388
- محل انتشار: دوازدهمین سمینار شیمی فیزیک ایران
- کد COI اختصاصی: ISPTC12_112
- زبان مقاله: انگلیسی
- تعداد مشاهده: 879
نویسندگان
Departemnt of Physical Chemistry, Isfahan University of Technology, Isfahan, Iran
Departemnt of Physical Chemistry, Isfahan University of Technology, Isfahan, Iran
Departemnt of Physical Chemistry, Isfahan University of Technology, Isfahan, Iran
چکیده
Now a days class of heat transfer fluids that are produced by dispersing metallic or non-metallic nanoparticles with typical length scales on the order of 1–100 nm in traditional heat transfer fluids properties that mainly determine the thermal performance of a liquid for heat transfer applications are the thermal conductivity; viscosity ; specific; and density: Most published studies have focused on the heat transfer behaviour including thermal conductivity; convective heat transfer ; and phase change (boilling) heat transfer ; however ; very few studies have been devoted specifically to the rheological behaviour of nanofluids: with regard to the nanofluid viscosity ; the lack of data in the literature is even ,ore striking : Determining the viscosity of the nanofluid is essential to establishing adequate pumping power as well as the convective heat transfer coefficient as the prandtl will be influenced: One of the most important base fluids in industrial base on the nanofluids technology is oil; engine oil; mineral oil ; which it has applicable cooling in the power generation, chemical production, automobiles, refrigeration and as the lubricant: Putting additives into oil to reduce friction and wear or to mend a worn surface has been widely applied in lubrication engineering for quite a long time Researchers in the lubrication research field have been searching fornew wear-mending materials as lubricant additives. In the past few years, nano-materials have emerged as a new choice in additive development. Many novel studies have been carried out with nanomaterials, many encouraging achievements have been obtained and the tribological properties of lubricant oil have been clearly enhanced which leads to the reduction of the friction coefficient: But, now a days, it is more widely believe that nano-particles deposit on the friction surface and compensate for the loss of mass, which has been called it ‘‘mending effect’’.کلیدواژه ها
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