DC-Arc technique has been used to synthesize carbon nanotubes from super clean coal, chemically cleaned coal, original coal and waste plastics instead of using high purity graphite in the presence of metal catalysts. The results obtained are compared in terms of yield, purity and type of carbon nanotubes produced from different types of raw material used. In the present study different types of raw materials have been prepared i.e. chemically cleaned coal and super clean coal, and the carbon nanotubes have been synthesized by DC Arc discharge method. Taking in account the present need of utilizing coal as a cheaper raw material for bulk production of carbon nanotubes and utilization of waste plastics (which itself is a potential environmental threat) for production of such an advance material the present work was undertaken. Since the process does not involve presence of any kind of metal catalyst, it avoids the cost intensive process of removal of these metal particles. The residual coal obtained after refining has major fuel potential and can be utilized for various purposes.
The current study examines the thermal conductivity and dynamic viscosity of ethylene glycol–water solutions comprising oxidised multiwalled carbon nanotubes. The Mouromtseff number (Mo) is used to estimate the heat transfer characteristics of nanofluids based on their physico-thermal properties. As a base fluid, ethylene glycol - water mixtures are taken in all volume proportions, from 100% to zero percent, for use in both automotive and solar thermal applications. Oxidized MWCNTs in weight fractions of 0.05, 0.1, 0.25, and 0.5 are used to produce the best stability in Ethylene glycol-Water mixtures. The stability of nanofluids was monitored for two months using UV-Vis spectroscopy. Adding MWCNTs to the base fluids results in a significant increase in thermal conductivity between 15% and 24%. In order to derive correlations between thermal conductivity and dynamic viscosity, a total of 1500 data points were collected for all possible combinations of temperature, weight fraction, and ethylene glycol %. from analysis using Mouromtseff number (Mo), it was found that under turbulent flow, low concentration dilute nanofluids were shown to be the most effective heat transfer medium.
The current study examines the thermal conductivity and dynamic viscosity of ethylene glycolwater solutions comprising oxidised multiwalled carbon nanotubes. The Mouromtseff number (Mo) is used to estimate the heat transfer characteristics of nanofluids based on their physicothermal properties. As a base fluid, ethylene glycol -water mixtures are taken in all volume proportions, from 100% to zero percent, for use in both automotive and solar thermal applications. Oxidized MWCNTs in weight fractions of 0.05, 0.1, 0.25, and 0.5 are used to produce the best stability in Ethylene glycol-Water mixtures. The stability of nanofluids was monitored for two months using UV-Vis spectroscopy. Adding MWCNTs to the base fluids results in a significant increase in thermal conductivity between 15% and 24%. In order to derive correlations between thermal conductivity and dynamic viscosity, a total of 1500 data points were collected for all possible combinations of temperature, weight fraction, and ethylene glycol %. from analysis using Mouromtseff number (Mo), it was found that under turbulent flow, low concentration dilute nanofluids were shown to be the most effective heat transfer medium.
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