Evaluation on enhanced heat transfer using sonochemically synthesized stable zno-eg@dw nanofluids in horizontal calibrated circular flow passage

Ahmed, Waqar and Zaman Chowdhury, Zaira and Kazi, Salim Newaz and Johan, Mohd Rafie and Badruddin, Irfan Anjum and Soudagar, Manzoore Elahi M. and Kamangar, Sarfaraz and Mujtaba, Muhammad Abbas and Gul, Mustabshirha and Khan, T. M. Yunus (2021) Evaluation on enhanced heat transfer using sonochemically synthesized stable zno-eg@dw nanofluids in horizontal calibrated circular flow passage. Energies, 14 (9). ISSN 1996-1073, DOI https://doi.org/10.3390/en14092400.

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In this research, Zinc Oxide-Ethylene @ glycol distilled water based nanofluid was synthesized using the sonochemical method. The convective heat transfer properties of as synthesized nanofluid were observed for a closed single circular tube pipe in turbulent flow regimes. The prepared nanofluids were characterized by ultra violet 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 circular tube test section were collected. The addition of ZnO solid nanoparticles in the EG@DW mixture enhanced the value of thermal conductivity and other thermophysical characteristics of the nanofluids. Maximum thermal conductivity was observed at 45 degrees C for using 0.1 wt.% of ZnO nanoparticles EG@DW nanofluid. Increasing the wt.% of ZnO solid nanoparticles in the EG@DW mixture had increased the thermal conductivity subsequently with change in temperature from 20 to 45 degrees C. Furthermore, Nusselt numbers of ZnO-EG@DW-based nanofluid was estimated for the various concentration of ZnO present in EG@DW-based fluid. The presence of ZnO solid nanoparticles into the EG@DW 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.% of ZnO (0.1, 0.075, 0.05 and 0.025) nanoparticles had shown improved heat transfer (h) properties compared to the base fluid alone. The absolute average heat transfer of ZnO-EG@DW nanofluid using the highest concentration of 0.1 wt.% was improved compared to the EG@DW mixture. The magnitude of absolute average heat transfer was increased from 600 W/m(2)k for the EG@DW mixture to 1200 W/m(2)k for ZnO-EG@DW nanofluid. Similarly, the heat transfer improvement for the other three wt.% (0.075, 0.05 and 0.025) was noticed as 600-1160, 600-950 and 600-900 W/m(2)k, respectively, which is greater than base fluid.

Item Type: Article
Funders: Deanship of Scientific Research at King Khalid University [R.G.P. 2/105/41], FRGS Grant [FP143-2019A] [RU001-2020]
Uncontrolled Keywords: Synthesis of ZnO; Friction factor; ZnO-EG@DW nanofluids; Nusselt (Nu) numbers; Heat recoveries by nanoparticles
Subjects: Q Science > QC Physics
T Technology > TP Chemical technology
Divisions: Faculty of Engineering > Department of Mechanical Engineering
Nanotechnology & Catalysis Research Centre
Institute of Advanced Studies
Depositing User: Ms Zaharah Ramly
Date Deposited: 13 Jun 2022 01:33
Last Modified: 01 Dec 2023 07:13
URI: http://eprints.um.edu.my/id/eprint/34316

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