بررسي هدايت گرمايي،ويسكوزيته واثر ترميمي نانو ذرات مس،اكسيد مس و اكسيد تيتانيوم در روغن پايه موتور

چكيده انگليسي :

Investigation of the thermal conductivity viscosity and mending effect of Cu CuO and TiO2 nanoparticles in the engine base oil Sabereh parvizi moghadam Sabere parvizi@yahoo com 2 03 2009 Department of chemistry Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisor Ezat Keshavarzi E mail keshavrz@cc iut ac ir Yousef Ghayeb E mail Ghayeb@iut ac irAbstract The aim of research is preparation stable nanofluids on base oil and determination thermal conductivity viscosity and investigation friction coefficient surfaces that contact together One of the most important basefluids in industrial base on the nanofluids technology is oil engine oil mineral oil which it has applicablecooling in the power generation chemical production outomobiles refrigeration and as the lubricant Puttingadditives into oil to reduce friction and wear or to mend a worn surface has been widely applied inlubrication engineering for quite a long time Researchers in the lubrication research field have been searchingfor new wear mending materials as lubricant additives In the past few years nano materials have emerged asa new choice in additive development Most researchers measured the thermal conductivity of TiO2 oil andCuO oil nanofluids with TiO2 and CuO nanoparticle for concentrations greater than or equal to 1 byvolume frction However little experimental data exist on the effective thermal conductivities and viscositiesof nanofluids with low volume concentrations 1 vol for TiO2 CuO Cu nanoparticles This motivatedus to do this study the objective of the present study is to measure the effective viscosities thermal andmending effect for TiO2 oil CuO oil Cu oil nanofluid at volume concentrations in the rang from 0 1 to 0 65vol TiO2 Cuo and Cu nanoparticles The effective viscosities of the TiO2 oil CuO oil and Cu oilnanofluids were measured as a function of particle volume concentration using an brokfild type viscometer The effective thermal conductivities of the TiO2 oil CuO oil nanofluids were measured as a function ofnanoparticle volume concentration using a transient hot wire KD2 apparatus A two step method is used toproduce TiO2 oil CuO oil Cu oil nanofluids with concentrations of TiO2 CuO Cu nanoparticles from 0 1to 0 65 vol without any surfactant Since ultrasonic vibration breaks down agglomerates in the mixture The effective viscosities of TiO2 oil CuO oil and Cu oil nanofluids with concentrations from 0 1 to 0 65vol were measured at the temperature of 22 C The effective thermal conductivities of TiO2 oil and CuO oil nanofluids concentrations 0 1 0 3 0 5 vol and from 0 02 to 0 5 vol were measured at 25 C showsresults the enhancement in the effective thermal conductivities of TiO2 oil and CuO oil nanofluids as afunction of nanoparticle volume fraction Also shows that the enhancement in the measured thermalconductivities of the TiO2 oil and CuO oil nanofluids increases with increasing concentration The presentresult shows that nanoparticles can be as dispersed particles in nanofluid if aggregation can be minimized soamount maximum thermal conductivity The pin on disk was used for measuring the tribologh propertiesabove mentioned nanofluids The experimental results of pin on disk tests and observations by SEM haveshown that the properties were improved by adding TiO2 CuO and Cu nanoparticles and also there exists amending effect on the friction surface after being lubricated with oil containing Tio2 CuO and Cu nano particles These testes performed for oil fluid and TiO2 nanofluid at different concentration contaning of0 1 0 3 0 5vol and CuO Cu nanofluid at concentration 0 3vol The results show that the optimumconcentration of TiO2 nanofluid is 0 3 vol for having the minimum rubbing and also the copper nano particles intensively decrease friction coefficient Keyword nanofluid thermal conductivity Viscosity Mending effect friction coefficient

پرويزي مقدم، صابره

بررسي هدايت گرمايي،ويسكوزيته واثر ترميمي نانو ذرات مس،اكسيد مس و اكسيد تيتانيوم در روغن پايه موتور

نانوسيال , ضريب اصطحكاك , نانو فناوري