Numerical study of turbulent heat transfer of nanofluids containing eco-friendly treated carbon nanotubes through a concentric annular heat exchanger

Hosseini, Maryam; Abdelrazek, Ali H.; Sadri, Rad; Mallah, Abdul Rahman; Kazi, S.N.; Chew, Bee Teng; Rozali, Shaifulazuar; Yusoff, Nukman

doi:10.1016/j.ijheatmasstransfer.2018.08.040

Cited by 34 publications

(8 citation statements)

References 37 publications

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“…As stated by many researchers [ 38 , 39 ], the finite volume method (FVM) can be used to solve partial differential equations (PDEs) by converting them to algebraic equations. The base fluid flows in similar velocity solid nanoparticles since the nanosuspensions were under the condition of a homogeneous single-phase flow, and therefore, and the effective thermal-physical properties of working fluids (DW and nanofluids) can be utilized to solve the transport equations such as continuity, momentum, and energy as below [ 40 ]:…”

Section: Methodsmentioning

confidence: 99%

Heat Transfer and Hydrodynamic Properties Using Different Metal-Oxide Nanostructures in Horizontal Concentric Annular Tube: An Optimization Study

et al. 2021

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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.

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Section: Methodsmentioning

confidence: 99%

Heat Transfer and Hydrodynamic Properties Using Different Metal-Oxide Nanostructures in Horizontal Concentric Annular Tube: An Optimization Study

et al. 2021

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“…The physical properties of the used C-MWCNT/water nanofluids were derived from the experimental work of Hosseini et al 40 (see Table 1). The dimensionless mass equation, motion equations, and heat equation for the unsteady-state thermal forced convection are formulated in the cylindrical coordinates system as follows:…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The physical properties of the used C‐MWCNT/water nanofluids were derived from the experimental work of Hosseini et al 40 (see Table 1).…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Regarding the annular duct configurations, which are very common in thermal applications, Hosseini et al 40 addressed numerical simulation of turbulent regime flow in a concentric annular thermal exchanger filled with clove‐treated multiwalled carbon nanotubes (C‐MWCNTs)‐DI water nanoliquids. They declared that the heat transfer coefficient was boosted by 9%, 8%, and 10% for 0.075, 0.125, and 0.175 wt% C‐MWCNTs concentrations, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Toward the thermohydrodynamic behavior of a nanofluid containing C‐MWCNTs flowing through a 3D annulus channel under constant imposed heat flux

2021

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The heat transport and friction factor in a three‐dimensional horizontal concentric annular duct filled with nanofluids comprising clove‐treated multiwalled carbon nanotubes are investigated numerically in this paper. The cylinder's outer surface is thermally insulated, while uniform heat flux is imposed on the cylinder's inner surface. The problem is formulated in dimensionless cylindrical coordinates. The numerical solutions were obtained based on the finite volume technique with second‐order precision, and cover a range of the Reynolds number 1000 ≤ Re ≤ 2000 and nanoparticle weight fractions 0.075, 0.125, and 0.175 wt%. To describe the results for both heat exchange and fluid flow performance, the temperature profile, Nusselt number, heat transfer coefficient, and friction factor are represented. The findings state that heat transport increases as Reynolds is increased and nanoparticles are introduced. The friction factor was also observed to improve as the concentration of nanoparticles increased. In addition, two new Nusselt number and friction factor correlations were established.

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“…Hosseini et al [ 79 ] investigated turbulent heat transfer through a concentric annular heat exchanger, see Figure 33 , containing a distilled water-based nanofluid with clove-treated multi-walled carbon nanotubes (C-MWCNTs). The authors tested the thermal and hydrodynamic properties via numerical simulation (finite volume method) for uniform and constant heat flux boundary conditions.…”

Section: Introducing Nanofluids In Heat Exchangersmentioning

confidence: 99%

Application of Nanofluids in Gas Turbine and Intercoolers—A Comprehensive Review

et al. 2022

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Today, the optimal use of non-renewable energy sources, reducing pollution, and increasing the efficiency of power-generating cycles are of particular importance. There are several ways to increase the efficiency of gas turbines; one that has recently attracted attention is to use an intercooler. However, the efficiency of the heat exchanger used in intercoolers depends on the type of heat exchanger, the characteristics of the operating fluid and the thermal boundary layers, and the pump speed. Improving the thermophysical properties of the working fluid is a passive method of increasing heat transfer, which has attracted the attention of those researching engineering applications. The current review addresses the latest methods of improving gas turbine efficiency using nanofluids and includes experimental and numerical studies. First, the general principles governing turbines are described, then the commonly used types of heat exchangers are introduced. Finally, studies on the use of nanofluids in heat exchangers are reviewed. The technology of producing nanoparticles that can be used in heat exchangers is also discussed. This review article can provide the reader with comprehensive information on making nanofluids and using them in heat exchangers used as intercoolers.

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Numerical study of turbulent heat transfer of nanofluids containing eco-friendly treated carbon nanotubes through a concentric annular heat exchanger

Cited by 34 publications

References 37 publications

Heat Transfer and Hydrodynamic Properties Using Different Metal-Oxide Nanostructures in Horizontal Concentric Annular Tube: An Optimization Study

Heat Transfer and Hydrodynamic Properties Using Different Metal-Oxide Nanostructures in Horizontal Concentric Annular Tube: An Optimization Study

Toward the thermohydrodynamic behavior of a nanofluid containing C‐MWCNTs flowing through a 3D annulus channel under constant imposed heat flux

Application of Nanofluids in Gas Turbine and Intercoolers—A Comprehensive Review

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