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Nowadays, due to high Industrialization and Miniaturization of the various gadgets, optical devices and in transportation large amount of heat is produced. The conventional fluids used for cooling such as water, ethylene glycol have very low thermal conductivity i.e., 0.609 W/mK and 0.258 W/mK respectively. Various studies have shown a very great enhancement in thermal conductivities of Nanofluids. CaCO3 is a very well known, cheaply and easily available material in many industries including plastic, textile, papers, paints, and pigments but there are very few studies on CaCO3 nanofluid. In this paper, initially, the CaCO3 was characterized by XRD and FTIR for structural and morphological properties. The CaCO3 nanoparticles were dispersed in base fluid ethylene glycol and its ultrasonic parameters at various concentration (0.01M, 0.02M, 0.03M, and 0.04M) and at various temperature (298K, 303K, 308K, and 313K) by continuous wave method were studied. The ultrasonic velocity and density of the individual base fluid and Nano-suspensions have been calculated. The thermal conductivity is calculated from above parameters. The enhancement in the thermal conductivity is observed with increase in concentration (i.e., 0.01M to 0.04 M). Also, CaCO3 nanofluid shows the Newtonian behavior and can be considered as a most promising coolant in place of conventional coolants.
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