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Heat transfer and h...
Heat transfer and hydrodynamic properties using different metal-oxide nanostructures in horizontal concentric annular tube : An optimization study
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- Alawi, Omer A. (author)
- University of Technology Malaysia (UTM)
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- Abdelrazek, Ali H. (author)
- University of Malaya
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- Aldlemy, Mohammed Suleman (author)
- Benghazi College of Mechanical Engineering Technology
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- Ahmed, Waqar (author)
- University of Malaya
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- Hussein, Omar A. (author)
- Tikrit University
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- Ghafel, Sukaina Tuama (author)
- Al-Ayen University
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- Khedher, Khaled Mohamed (author)
- Mrezga University
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- Scholz, Miklas (author)
- Lund University,Lunds universitet,Avdelningen för Teknisk vattenresurslära,Institutionen för bygg- och miljöteknologi,Institutioner vid LTH,Lunds Tekniska Högskola,Division of Water Resources Engineering,Department of Building and Environmental Technology,Departments at LTH,Faculty of Engineering, LTH,Wrocław University of Environmental and Life Sciences,South Ural State University,University of Johannesburg
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- Yaseen, Zaher Mundher (author)
- Al-Ayen University
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(creator_code:org_t)
- 2021-07-31
- 2021
- English.
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In: Nanomaterials. - : MDPI AG. - 2079-4991. ; 11:8
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Abstract
Subject headings
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- Numerical studies were performed to estimate the heat transfer and hydrodynamic properties of a forced convection turbulent flow using three-dimensional horizontal concentric annuli. This paper applied the standard k–ε turbulence model for the flow range 1 × 104 ≤ Re ≥ 24 × 103. A wide range of parameters like different nanomaterials (Al2O3, CuO, SiO2 and ZnO), different particle nanoshapes (spherical, cylindrical, blades, platelets and bricks), different heat flux ratio (HFR) (0, 0.5, 1 and 2) and different aspect ratios (AR) (1.5, 2, 2.5 and 3) were examined. Also, the effect of inner cylinder rotation was discussed. An experiment was conducted out using a field-emission scanning electron microscope (FE-SEM) to characterize metallic oxides in spherical morphologies. Nano-platelet particles showed the best enhancements in heat transfer properties, followed by nano-cylinders, nano-bricks, nano-blades, and nano-spheres. The maximum heat transfer enhancement was found in SiO2, followed by ZnO, CuO, and Al2O3, in that order. Meanwhile, the effect of the HFR parameter was insignificant. At Re = 24,000, the inner wall rotation enhanced the heat transfer about 47.94%, 43.03%, 42.06% and 39.79% for SiO2, ZnO, CuO and Al2O3, respectively. Moreover, the AR of 2.5 presented the higher heat transfer improvement followed by 3, 2, and 1.5.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering (hsv//eng)
Keyword
- Concentric annuli
- Hydrodynamic properties
- Nanofluids
- Nanoparticle shape
- Turbulent mixed convection
Publication and Content Type
- art (subject category)
- ref (subject category)
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