A review of the applications of nanofluids in solar energy

Mahian, Omid; Kianifar, Ali; Kalogirou, Soteris A.; Pop, Ioan; Wongwises, Somchai

doi:10.1016/j.ijheatmasstransfer.2012.10.037

Cited by 1,144 publications

(383 citation statements)

References 83 publications

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“…(16) and (17), the general model developed in eqns. (14)- (18) reduces to the case examined by Ishak et al 48 when M = 0 and Re = 1 is prescribed in their paper. Finally the model studied by Zaimi et al 49 is retrieved exactly when Eqns.…”

Section: Maple 18 Numerical Solution Special Cases and Validationmentioning

confidence: 84%

“…(16) and (17) are neglected and Nt = N b = 0 is prescribed in the general model defined by eqns. (14) to (18). To validate the accuracy of our present code, we compare the numerical result for the local skin friction coefficient f ′′ (1) and −θ ′ (1) when S = 0, M = 0 and Re =1 with the solutions given by Ishak et al 48 and Wang.…”

Section: Maple 18 Numerical Solution Special Cases and Validationmentioning

confidence: 91%

“…This has implications in medical applications, power generation, micro-manufacturing, thermal therapy for cancer treatment, chemical and metallurgical sectors, microelectronics, aerospace and manufacturing. 12 Representative works on convective boundary layer flow and application of nanofluids were conducted by Buongiorno, 13 Das et al, 14 Kakaç and Pramuanjaroenkij, 15 Saidur et al 16 and Wen et al 17 Further studies have been communicated by Mahian et al, 18 Nield and Bejan, 19 Haddad et al, 20 Sheremet and Pop 21 and many others. There are two types of model for nanofluids which have been commonly used by the researchers, namely Buongiorno's model 13 and the Tiwari-Das model.…”

Section: Introductionmentioning

confidence: 98%

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Nanofluid slip flow over a stretching cylinder with Schmidt and Péclet number effects

et al. 2016

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A mathematical model is presented for three-dimensional unsteady boundary layer slip flow of Newtonian nanofluids containing gyrotactic microorganisms over a stretching cylinder. Both hydrodynamic and thermal slips are included. By applying suitable similarity transformations, the governing equations are transformed into a set of nonlinear ordinary differential equations with appropriate boundary conditions. The transformed nonlinear ordinary differential boundary value problem is then solved using the Runge-Kutta-Fehlberg fourth-fifth order numerical method in Maple 18 symbolic software. The effects of the controlling parameters on the dimensionless velocity, temperature, nanoparticle volume fractions and microorganism motile density functions have been illustrated graphically. Comparisons of the present paper with the existing published results indicate good agreement and supports the validity and the accuracy of our numerical computations. Increasing bioconvection Schmidt number is observed to depress motile micro-organism density function. Increasing thermal slip parameter leads to a decrease in temperature. Thermal slip also exerts a strong influence on nano-particle concentration. The flow is accelerated with positive unsteadiness parameter (accelerating cylinder) and temperature and micro-organism density function are also increased. However nano-particle concentration is reduced with positive unsteadiness parameter. Increasing hydrodynamic slip is observed to boost temperatures and micro-organism density whereas it decelerates the flow and reduces nano-particle concentrations. The study is relevant to nano-biopolymer manufacturing processes.

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Section: Maple 18 Numerical Solution Special Cases and Validationmentioning

confidence: 84%

Section: Maple 18 Numerical Solution Special Cases and Validationmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 98%

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Nanofluid slip flow over a stretching cylinder with Schmidt and Péclet number effects

et al. 2016

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“…Similar studies in this field were conducted by other researchers. [16][17][18][19] In particular, Kasaeian et al, 20 Kim et al, 21 Leong et al, 22 Mahian et al, 23 and Sarsam et al 24 presented results of very extensive work on the use of nanofluids in solar energy systems. Other potential applications for nanofluids include friction reduction, [25][26][27] magnetic sealing, [28][29][30][31] biomedical applications, 32,33 electronic cooling, [34][35][36] and many others.…”

Section: Introductionmentioning

confidence: 99%

Dielectric Properties of Boron Nitride-Ethylene Glycol (BN-EG) Nanofluids

Fal

Cholewa

Gizowska

et al. 2016

Journal of Elec Materi

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This paper presents the results of experimental investigation of the dielectric properties of ethylene glycol (EG) with various load of boron nitride (BN) nanoparticles. The nanofuids were prepared by using a two-step method on the basis of commercially available BN nanoparticles. The measurements were carried out using the Concept 80 System (NOVOCONTROL Technologies GmbH & Co. KG, Montabaur, Germany) in a frequency range from 10 Hz to 10 MHz and temperatures from 278.15 K to 328.15 K. The frequency-dependent real (e 0 ) and imaginary (e 00 ) parts of the complex permittivity (e Ã ) and the alternating current (AC) conductivity are presented. Also, the effect of temperature and mass concentrations on the dielectric properties of BN-EG nanofluids are demonstrated. The results show that the most significant increase can be achieved for 20 wt.% of BN nanoparticles at 283.15 K and 288.15 K, that is eleven times larger than in the case of pure EG.

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“…For instance, using of nanofluids has been the subject of research by many researchers [5]. Nanofluids are capable to enhance the heat transfer coefficient of the working fluids, which are circulating through the absorber tubes of the solar thermal units.…”

mentioning

confidence: 99%

Solar Thermal Engineering

Kasaeian¹,

Feidt²,

Petrescu³

et al. 2017

International Journal of Photoenergy

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The increasing demands to energy, from one side, and the global warming crisis of the world, from other side, are the reasons for developing renewable energies [1]. Among all resources of renewable energies, solar energy is the unlimited resource which can be exploited all over the world. The prices for solar generation technologies continue to rapidly decrease; so that, in some cases, the cost is competitive with the fossil fuel costs [2]. The thermal conversion of solar energy is possible by different collectors including flat and concentrating collectors. For the purpose of reaching largescale energy conversion in both forms of electricity and thermal, the usage of different solar concentrating collectors would be a favorite selection [1]. Besides the application of solar flat and concentrating collectors, other kinds of energy conversion units have been focused by different researchers. For achieving wind and rotating turbines, solar chimneys would be a preferred option in the windless zones [3]. Also, for the purpose of supplying potable water, the solar stills have been developed in different types and designs [4].In the recent years, in case of the application of solar thermal systems, the usage of special materials has been paid attention for increasing the efficiency. For instance, using of nanofluids has been the subject of research by many researchers [5]. Nanofluids are capable to enhance the heat transfer coefficient of the working fluids, which are circulating through the absorber tubes of the solar thermal units. Also, the phase change materials (PCMs) are another materials which have found a special situation in the solar thermal systems. PCMs can store/release a large amount of heat during melting/solidification or gasification/liquefaction processes. Since the phase-transition enthalpy of PCMs is usually much higher than sensible heat, latent heat storage has much higher storage density than sensible heat storage [6]. So, this case will be another potential for the future studies in the field of solar thermal energy.Regarding the importance of solar energy as the main sustainable resource among all renewable resources, it was interesting to gather the research findings of this subject in a special issue. The issue covers all new research articles about solar radiation and solar thermal energy systems. The aim was focused on the thermal conversion aspect of solar energy. So, the conversion systems including flat collecting and concentrating systems were gathered in this issue. Besides the technical issues related to solar thermal energy, the economic and environmental subjects were of interest for review. So, the topics including solar radiation, potential and feasibility study, flat and evacuated tube collectors, trough and Fresnel collectors, solar Stirling systems, heliostat fields, solar chimney, solar desalination, nanofluid in solar thermal systems, green buildings, passive solar systems, solar biomimetic systems, optimization in solar thermal systems, economic aspects of solar power plant...

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A review of the applications of nanofluids in solar energy

Cited by 1,144 publications

References 83 publications

Nanofluid slip flow over a stretching cylinder with Schmidt and Péclet number effects

Nanofluid slip flow over a stretching cylinder with Schmidt and Péclet number effects

Dielectric Properties of Boron Nitride-Ethylene Glycol (BN-EG) Nanofluids

Solar Thermal Engineering

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