Preparation of nano suspensions for heat recoveries and enhanced energy transportation

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Waqar Ahmed

Malaysia-Japan International Institute of Technology, Malaysia

: J Nanomater Mol Nanotechnol

Abstract

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Abstract: In the current research the Metal Oxide, Carbon structured and Graphene Oxide-based nanofluid was synthesized using the sonochemical method. The convective heat transfer properties of synthesized nanofluid were observed for varying geometries of closed single tube pipe in turbulent flow regimes. The prepared nanofluids were characterized by ultraviolet spectroscopy (UV–VIS), UV–VIS absorbance, X-Ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Transmission electron microscopy (TEM) and stability analysis. Five calibrated k-type thermocouples were mounted on the surface of the test section. Analytical data related to heat transfer properties of the synthesized nanofluid for the heat exchanger, incorporated with the closed tube with varying geometries were collected. The addition of Metal Oxide, Carbon structured and Graphene Oxide solid nanoparticles in the DW, EG, and EG@DW mixture enhanced the value of thermal conductivity and other thermophysical characteristics of the nanofluids. Maximum thermal conductivity was observed at 45 °C for using 0.1 wt.% of varying nanofluids. Increasing the wt.% of solid nanoparticles in DW, EG, and EG@DW mixture had increased the thermal conductivity subsequently with change in temperature from 20 to 45 °C. Furthermore, Nusselt numbers of Metal Oxide, Carbon structured and Graphene Oxidebased nanofluid was estimated for the various concentration. The presence of solid nanoparticles into the DW, EG and EG@DW mixture base fluid escalate the Nusselt (Nu) number by 49.5%, 40.79%, 37% and 23.06% for 0.1, 0.075, 0.05 and 0.025 wt.% concentrations, respectively, at room temperature. Varying wt.% (0.1, 0.075, 0.05, and 0.025) of Metal Oxide, Carbon structured and Graphene Oxide-based nanofluid nanoparticles had shown improved heat transfer (h) properties compared to the base fluid alone. The absolute average heat transfer of all the nanofluids at the highest concentration of 0.1 wt. % was improved compared to the DW, EG, and EG@DW mixture. The magnitude of absolute average heat transfer was increased from 600-1200 W/m2k, 600–1160, 600–950 and 600–900 W/m2k, respectively at varying (0.1,0.075, 0.05 and 0.025) wt.% concentrations, which is greater than base fluid. Keywords: Metal Oxides; Carbon Materials; Graphene Oxide; Nanofluids Heat transfer; Heat Exchangers.

Biography

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Waqar Ahmed has secured a Ph.D. degree in (Material Physics with DISTINCTION + 10 ISI papers + 1 patent) from the University of Malaya world QS Ranked 65. Also, I have done my MS in Electrical Engineering degree from COMSATS University in 2016. My Bachelor's degree is in Electronics and Telecom (B.Tech Honor) from Sarhad University Peshawar in 2011. So far, I have published 34 high impact peer-reviewed original research articles in highly reputable journals such as RSRE, Energy, Renewable energy, ICHMT, JTAC, LDIS, Energies and Energy reports, etc. In most of my published work, I am the first author or corresponding author.