Influence of triangle tube structure with twisted tape on the thermo-hydraulic performance of nanofluids in heat-exchange system based on thermal and exergy efficiency

Qi, Cong; Liu, Maoni; Tang, Jinghua

doi:10.1016/j.enconman.2019.04.047

Cited by 69 publications

(21 citation statements)

References 69 publications

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“…This compelled the researcher to do a comprehensive thermo‐hydraulic performance analysis of the problem and to achieve an optimal working condition of the problem. A comprehensive performance index of the problem was formulated by using thermal and exergy efficiency theories . The best‐suited condition for the problem was identified from the formulated equation of comprehensive performance index, to get the maximum HT and least increase in Δ p of the working fluid.…”

Section: Challenges With Nanofluidsmentioning

confidence: 99%

Performance enhancement of photovoltaic modules by nanofluid cooling: A comprehensive review

2020

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Summary Only 15‐20% of solar radiation incident on the photovoltaic (PV) cells is utilized which further reduces due to the rise in the temperature of the PV module and it also degrades the lifespan of the PV module. Therefore, numerous attempts were made to reduce this rising temperature of the PV module and different cooling techniques were employed. Nanofluid cooling is one of the potential cooling techniques for lowering the temperature of the PV module and augmenting the heat transfer by increasing the thermal conductivity of the nanofluid relative to the base fluid (BF). The experimental and numerical studies related to the cooling of PV cells with nanofluids have been reviewed. It was found that the heat transfer from the back of the PV module is enhanced with the augmentation in the concentration of nanoparticle in BF; however, some studies also demonstrate that the enhancement in the heat transfer also depends upon other factors such as the geometry at the rear of the PV module, nanoparticle material, nanoparticle size, BF, ambient conditions, etc. This review article also demonstrates the various issues with nanofluids such as instability, technological difficulties, high system costs, and the impossibility of finding a viable operational design which creates a barrier in the commercialization of the nanofluid cooling technique for PV modules.

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Section: Challenges With Nanofluidsmentioning

confidence: 99%

Performance enhancement of photovoltaic modules by nanofluid cooling: A comprehensive review

2020

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“…This, in turn, allows for obtaining much better thermal properties in the case of nanofluids rather than colloidal suspensions of microparticles or the base fluids alone. Over the last decades, many scholars focused on the investigation of nanometric particle suspensions [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ]. The key issues in nanofluid research are to prepare stable solutions and increase the thermal conductivity of the liquid, without a significant increase in viscosity that could penalize pumping power [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

Few-Layer Graphene-Based Nanofluids with Enhanced Thermal Conductivity

et al. 2020

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High-quality graphene is an especially promising carbon nanomaterial for developing nanofluids for enhancing heat transfer in fluid circulation systems. We report a complete study on few layer graphene (FLG) based nanofluids, including FLG synthesis, FLG-based nanofluid preparation, and their thermal conductivity. The FLG sample is synthesized by an original mechanical exfoliation method. The morphological and structural characterization are investigated by both scanning and transmission electron microscopy and Raman spectroscopy. The chosen two-step method involves the use of thee nonionic surfactants (Triton X-100, Pluronic® P123, and Gum Arabic), a commercial mixture of water and propylene glycol and a mass content in FLG from 0.05 to 0.5%. The thermal conductivity measurements of the three FLG-based nanofluid series are carried out in the temperature range 283.15–323.15 K by the transient hot-wire method. From a modeling analysis of the nanofluid thermal conductivity behavior, it is finally shown that synergetic effects of FLG nanosheet size and thermal resistance at the FLG interface both have significant impact on the evidenced thermal conductivity enhancement.

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“…Due to the reduction of magnetic force and permeability exergy drop and Bejan number got detract. Heat transmission augmentation through nanofluid is investigated by Qi et al [24]. The influence of rotated twisting tape has been considered.…”

Section: Introductionmentioning

confidence: 99%

MHD effect on unsteady flow of tangent hyperbolic nano-fluid past a moving cylinder with chemical reaction

et al. 2020

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This study presents the exploration of unsteady magnetohydrodynamic (MHD) free convection flow of tangent hyperbolic nano-fluid flow on a moving cylinder with Brownian motion and thermophoresis effects. The current flow analysis yields nonlinear partial differential equations. The governing equations such as continuity, momentum, temperature and concentration are converted into dimensionless form and then solved numerically by adopting explicit finite difference method where Compaq Visual FORTRAN 6.6.a was also used for simulating the fluid flow system. The numerical outcomes are showed graphically to understand the result clearly. For the accurateness of the numerical technique a stability and convergence analysis was carried out. The aim was to illustrate the physical impacts of chemical reaction parameter, thermal radiation and viscous dissipation on various fluid fields along with the advanced visualization through streamlines. By comparing with the previous studies it was found that this fluid influenced the mass and heat properties more significantly rather than the other fluid. Additionally, this model predicts the shear thinning attitude significantly and describes the blood flow accurately. It has also applications in biological sciences, bio-engineering maneuver, and petroleum industries. Eventually the obtained outcomes were validated with previously published articles. KeywordsTangent hyperbolic fluid • Nanoparticle • EFDM • Chemical reaction • MHD List of symbols B 0 External magnetic field (Wb m −2 ) C P Specific heat at constant pressure (J kg −1 K −1 ) C Concentration component C w Concentration of the cylinder (mol.) C ∞ Concentration away from the cylinder C f Skin friction (-) D B Brownian diffusion coefficient D T Thermophoresis diffusion coefficient g Gravitational acceleration (m s −2 ) Gr Thermal Grashof number (-) Gm Mass Grashof number (-) Kr Chemical reaction parameter (-) Le Lewis number (-) M Magnetic parameter (-) n Power low index (-) Nb Brownian parameter (-) Nt Thermophoresis parameter (-) Nu Nusselt number (-) Pr Prandlt number (-) q r Radiative heat flux (kg m −2 ) Ra Radiation parameter (-) Sh Sherwood number (-) T Temperature (K)

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Influence of triangle tube structure with twisted tape on the thermo-hydraulic performance of nanofluids in heat-exchange system based on thermal and exergy efficiency

Cited by 69 publications

References 69 publications

Performance enhancement of photovoltaic modules by nanofluid cooling: A comprehensive review

Performance enhancement of photovoltaic modules by nanofluid cooling: A comprehensive review

Few-Layer Graphene-Based Nanofluids with Enhanced Thermal Conductivity

MHD effect on unsteady flow of tangent hyperbolic nano-fluid past a moving cylinder with chemical reaction

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