Abstract
Electro discharge process has been introduced as an innovative method in production of nanosized particles in recent years. This research aimed to produce graphite nanofluid by submerged electro discharge process and evaluate the features of synthesized nanofluid, including particle size, thermal conductivity, and stability of suspension. The effects of pulse current, pulse on-time, base fluid composition, and temperature of base fluid during discharge process on the size and agglomeration of synthesized nanoparticles have been investigated. For the thermal conductivity measurement of nanofluids, a modified device based on transient hot wire technique was developed. According to metallurgical observations, the original structure of synthesized graphite nanoparticles was hexagonal and the shape of suspended particles was globular with uniform size distribution below 50 nm. Nevertheless, a low pulse on-time is strongly recommended for production of nanofluids with smaller size of particles and aggregations, along with higher stability of suspensions. The results revealed considerable enhancement in the thermal conductivity of nanofluids up to 73 % at medium temperature of 40 °C. Furthermore, the application of 1 vol% of gum acacia as surfactant provided significant stability of suspension over a long period of time even without being subjected to the ultrasonic homogenization process.
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Shabgard, M., Seyedzavvar, M. & Abbasi, H. Investigation into features of graphite nanofluid synthesized using electro discharge process. Int J Adv Manuf Technol 90, 1203–1216 (2017). https://doi.org/10.1007/s00170-016-9388-4
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DOI: https://doi.org/10.1007/s00170-016-9388-4