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A High Thermal Conductivity of MgO-H₂O Nanofluid Prepared by Two-Step Technique

Judran, Hadia Kadhim ; Al-Hasnawi, Adnan G. Tuaamah ; Al Zubaidi, Faten N. ; Al-Maliki, Wisam Abed Kattea ; Alobaid, Falah ; Epple, Bernd (2022):
A High Thermal Conductivity of MgO-H₂O Nanofluid Prepared by Two-Step Technique. (Publisher's Version)
In: Applied Sciences, 12 (5), MDPI, e-ISSN 2076-3417,
DOI: 10.26083/tuprints-00021106,
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Item Type: Article
Origin: Secondary publication DeepGreen
Status: Publisher's Version
Title: A High Thermal Conductivity of MgO-H₂O Nanofluid Prepared by Two-Step Technique
Language: English
Abstract:

In this paper, the main goal is to study the impact of nanopowder volume concentration and ultrasonication treatment time on the stability and thermophysical properties of MgO-DW nanofluid at room temperature. The co-precipitation method was utilized to prepare pure MgO nanoparticles with an average particle size of 33 nm. The prepared MgO nanopowder was characterized by using XRD, SEM, and EDX analyses. Then, MgO-DW nanofluid was obtained with different volume concentrations (i.e., 0.05, 0.1, 0.15, 0.2, and 0.25 vol.%) and different ultrasonication time periods (i.e., 45, 90, 135, and 180 min) by using a novel two-step technique. With volume concentration and ultrasonication time of 0.15 vol.% and 180 min, respectively, good stability was achieved, according to the zeta potential analysis. With increasing volume concentration and ultrasonication time period of the nanofluid samples, the thermal conductivity measurements showed significant increases. As a result, the maximum enhancement was found to be 25.08% at a concentration ratio of 0.25 vol.% and agitation time of 180 min. Dynamic viscosity measurements revealed two contrasting trends with volume concentration and ultrasonication time. The lowest value of relative viscosity was gained by 0.05 vol.% MgO-DW nanofluid. The chemical and physical interactions between MgO nanoparticles and DW molecules play an important function in determining the thermal conductivity and dynamic viscosity of MgO-DW nanofluid. These findings exhibit that MgO-DW nanofluid has the potential to be used as an advanced heat transfer fluid in cooling systems and heat exchangers.

Journal or Publication Title: Applied Sciences
Journal volume: 12
Issue Number: 5
Publisher: MDPI
Collation: 18 Seiten
Uncontrolled Keywords: MgO-DW nanofluid, two-step technique, co-precipitation, XRD and SEM, thermal conductivity, dynamic viscosity
Classification DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Divisions: 16 Department of Mechanical Engineering > Institut für Energiesysteme und Energietechnik (EST)
Date Deposited: 08 Apr 2022 11:19
Last Modified: 08 Apr 2022 11:19
DOI: 10.26083/tuprints-00021106
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-211067
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/21106
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