Nanomaterials (Basel, Switzerland), 2021-07, Vol.11 (8), p.1979
2021
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- Autor(en) / Beteiligte
- Titel
- Heat Transfer and Hydrodynamic Properties Using Different Metal-Oxide Nanostructures in Horizontal Concentric Annular Tube: An Optimization Study
- Ist Teil von
- Nanomaterials (Basel, Switzerland), 2021-07, Vol.11 (8), p.1979
- Ort / Verlag
- Basel: MDPI AG
- Erscheinungsjahr
- 2021
- Quelle
- EZB Electronic Journals Library
- Beschreibungen/Notizen
- 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.
- Sprache
- Englisch
- Identifikatoren
- ISSN: 2079-4991eISSN: 2079-4991DOI: 10.3390/nano11081979Titel-ID: cdi_doaj_primary_oai_doaj_org_article_1be1f7e7bb0841aea04e17cd15de9852
- Format
- –
- Schlagworte
- Aluminum oxide, Aspect ratio, Blades, Bricks, Computational fluid dynamics, Concentric annuli, Convection, Copper oxides, Engineering and Technology, Fluids, Forced convection, Heat conductivity, Heat flux, Heat transfer, Hydrodynamic properties, K-epsilon turbulence model, Maskinteknik, Mechanical Engineering, Metal oxides, Morphology, Nanofluids, Nanomaterials, Nanoparticle shape, Nanoparticles, Nanotechnology, Optimization, Parameters, Physical properties, Platelets, Platelets (materials), Ratios, Rotating cylinders, Rotation, Scanning electron microscopy, Silicon dioxide, Teknik, Three dimensional flow, Turbulent flow, Turbulent mixed convection, Viscosity, Zinc oxide, Zinc oxides