Miracles Fluid or Nanofluids comes under advanced kind of working fluid that attracts special attention due to their capabilities in heat transfer enhancement. Nanofluids or Miracles fluids consist of ultra fine particles (1-100 nm) it is so small like salt or powder but their unique property is that each of their particles is disperse from each other. Nanofluids are mixed with base fluid like water, Lubricating oil due to their ultra fine particle size (1-100) nm in diameter.. An experimental investigation has been done at different temperature range (30-70°C) with varying different volume concentration (0.1% to 5%), with 20 nm size of Al2O3(Gamma) &Al2O3 (Alpha) nanoparticles to study the behaviour of Thermal conductivity of Nanofluids and compare it with the base fluid i.e Lubricating oil.(160-SZ.)

After performing this experiment it is concluded : 1)Absorbence ratio of Alumina (Gamma) Nanofluid with lubricating oil (160-SZ) is higher than the Absorbence ratio of Alumina (ALPHA) Nanofluid with Lubricating oil (160-sz). This is due to Alumina (Gamma) nanofluid has a higher surface value to its porous structure which enhances Absorption efficiency. 2)Alumina (Gamma) nanofluid with lubricating oil (160-sz) has a higher surface are due to its orientation structure that lead to the heat absorption property. 3) Surface property In Alumina (Gamma) nanofluid it has a porous active surface that has an edge for the better absorption property. 4)Alumina (Gamma) nanofluid with base fluid lubricating oil (160-sz) has a rhombohedral structural that leads to higher surface are which enhances Absorption in a better way.: The variation in Absorption Ratio in Alumina (Gamma) Nanofluid with base fluid (160-sz) as compared to Alumina (Alpha) Nanofluid with base fluid lubricating oil (160-sz) is of 10%, sometimes it is of 11%.etc. It clears from the experiment that Absorption ratio of Alumina (Gamma) nanofluid is better than Absorption ratio of Alumina (Alpha) nanofluid. It is Also Concluded that the Thermal conductivity of Alumina (ALPHA) Nanofluid with base fluid lubricating oil (160-sz) is better than Thermal Conductivity of Alumina (gamma) nanofluid with base fluid lubricating oil (160-sz). There are certain reasons for it . 1)Structure : Alumina (ALPHA) Nanofluid with base fluid lubricating oil (160-sz) has a Solid structure as compared to Alumina (Gamma) nanofluid with lubricating oil (160-sz) that inherit thermal properties which result in better haet transfer enhancement. 2)PHASE POROSITY : Phase structure of Alumina (Alpha) nanofluid has higher value of phase fraction and the porosity result in a lower mass based specific heat capacity. Thus Generally a sample with a higher fraction of α phase and a lower porosity possesses a higher thermal conductivity 3)EASILY DISPERSED INTO SURFACTANTS: Alumina (Alpha) nanofluid with base fluid lubricating oil (160-sz) has a property to easily dispersed into surfactants. The addition of surfactants to the nanofluid generally increase Thermal conductivity. Result shows that Alumina (Alpha) nanofluid base fluid lubricating oil (160-sz) with surfactants enhance thermal conductivity to 13% as compared without surfactants. So this property of Alumina (ALPHA) Nanofluid /base fluid lubricating oil 160-sz. of dispersion of surfactants to its base fluid lead to the enhancement of Thermal conductivity as compared to Alumina (Gamma) Nnaofluid. 4)FLUID STABILITY AND AGGLOMERATION : Stability is a great factor in enhancing Thermal conductivity. Nanoparticles can cluster together due to van der Waals forces, which can lead to settling and decreased heat transfer performance. Agglomeration can be mitigated with surface-active agents (surfactants) or by adjusting the nanofluid’s pH. So fluid stability and agglomeration plays a vital role in Thermal conductivity. Alumina (ALPHA) nanofluid has better agglorometion that leads to enhancement in Thermal conductivity. 5)Preparation Method : Two step method lead to better Thermal conductivity due to its surface absorption, easiness for base fluid etc. So from the Experimental Investigationit it is concluded that Thermal conductivity of Alumina (ALPHA) Nanofluid is better than Alumina (Gamma) Nanofluid,

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