Increasing heat transfer in flat plate solar collectors using various forms of turbulence-inducing elements and CNTs-CuO hybrid nanofluids

Nabi, Hossein; Pourfallah, Mohsen; Gholinia, M.; Jahanian, Omid

doi:10.1016/j.csite.2022.101909

Cited by 38 publications

(14 citation statements)

References 36 publications

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“…The efficiency of a solar collector can be improved due to increased turbulence. Nabi et al [25] used turbulence induced elements and nano-fluids to enhance the heat transfer rate. Element shown in the case 3 given the higher turbulence.…”

Section: Developments In Indirect-mode Solar Dryersmentioning

confidence: 99%

Evaluation of Energy Performances of Solar Dryers

Kumar

2023

IJEE

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In solar drying, the moisture content of a product is reduced through the use of sunlight. Solar drying is practiced since civilization for the drying of crops. The dried crop has a longer shelf life and requires less storage space. For crop drying, hot air is required in the moderate temperature range of 40 to 75℃. Solar dryer makes it possible to obtain better product quality. Over the past 20 years, numerous experimental projects have been carried out in the field of solar dryers. Most conventional dryers are not able to operate continuously during the off sunshine time. However, attempts were made to develop uninterrupted solar drying systems by incorporating an energy storage facility and a hybrid mode of operation. Sensible and latent heat storage methods are widely used to store solar energy. Heat storage materials store energy in the form of heat during sunshine and release it whenever it is required. Biogas backup, Chemical heat pump, Photo Voltaic, and Fluidized bed methods were integrated with solar dryers for uninterrupted operation. In this article, the discussion is made about different dryers. Also, the challenges and scope in the area of the solar dryer are highlighted.

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Section: Developments In Indirect-mode Solar Dryersmentioning

confidence: 99%

Evaluation of Energy Performances of Solar Dryers

Kumar

2023

IJEE

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“…Considering constant wall heat-flux conditions, a copper conduit using water, single-particle, and hybrid nanofluids as working substances is explored using computational fluid dynamics (CFD) techniques.The main objective of this study is to find out the fluid flow and heat transfer charecteristics in the channel. Keeping the same heat input rate, the (calculated) value of heat flux for the present configuration is ≈ 7955 W⁄m 2 Continuity Equation: (11) Momentum Equation: (12) Energy Equation: (13) The stress tensor (Eq. ( 12) and Eq.…”

Section: Problem Description and Mathematical Modelmentioning

confidence: 99%

“…The average heat transfer coefficient is estimated considering rate of heat transfer , heat transfer area , mean surface temperature of the wall and mean temperature of fluid [13,14]:…”

Section: Evaluation Of Different Parametersmentioning

confidence: 99%

Numerical Study of Heat Transfer Enhancement with Nanofluid in Rectangular Duct.

Ray

2023

Preprint

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In order to reduce heat losses and enhance heat transfer efficiency, energy conservation and management in thermal systems has attracted interest on a global scale. Due to limitations on continuous improvement in thermophysical characteristics of traditional working fluids, R&D trends have shifted towards nanofluids applications in heat transfer systems. Literature review substantiates that single-particle nano fluids are wellsuited for heat transfer applications. Employing hybrid nanofluids to improve heat transfer rates is a comparably new field of research and application.. In the present numerical study, enhancement of heat transfer rates is observed for flows of single-particle and hybrid nanofluids through a rectangular, straight duct of uniform crosssection, subjected to symmetrical and uniform wall heat flux conditions. The present work is carried out to investigate heat transfer augmentation characteristics of hybrid nanofluids and single-particle nanofluids, for different nanoparticle mixture ratios dispersed in water. The simulations are performed with 0.5%, 1.0% and 2.0% volume fractions of nano particles. The Reynolds number of flow is varied from 2000 to 12000. The uniform heat flux applied along the tube length is ≈ 7955 W/m 2 . The effects of Reynolds number, volume fraction, and composition of nanoparticles are analysed from the perspective of fluid and thermal analysis. The validation of the results obtained from present study has been performed with experimental and published data available in open literature. The wall-averaged Nusselt number and the pressure drop rise as the Reynolds number and the volume fraction is increased. This warrants a trade-off between heat transfer enhancement on one hand, and mechanical head losses on the other. The heat transfer characteristics of the chosen water-dispersed, hybrid nanofluid is also observed to be superior as compared to the single-particle nanofluid medium.

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“…Nabi et al . 17 observed the increasing energy transport analysis in flat plate containing a mixture of carbon nanotubes and copper oxide nanofluid by using CFD software. Recent studies related to the hybrid nanofluid flow are addressed in Refs.…”

Section: Introductionmentioning

confidence: 99%

Multiple solutions for non-linear radiative mixed convective hybrid nanofluid flow over an exponentially shrinking surface

Sarfraz

Yasir

Khan

2023

Sci Rep

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Hybrid nanofluids have gained too much attention due to their enhanced thermophysical properties and practical applications. In comparison to conventional nanofluids, their capacity to enhance heat transport is impressive. The simultaneous numerical calculations of hybrid and mono nanofluids across an exponentially shrinking surface in a porous medium are taken into consideration here. The analysis of the thermal energy distribution is carried out by using the convective boundary conditions. Shrinking, permeability, and magnetohydrodynamic controlled the motion of the flow. The objective of this research is to conduct stability analysis and identify the existence of dual solutions in the presence of heat source/sink and nonlinear Roseland thermal radiation. The technique, bvp4c, a collocation method is used to achieve numerical results. It is noted that the energy transport is enhanced immensely due to the presence of a mixture of nanoparticles (hybrid) in comparison to mono nanofluids. The stability analysis shows that the solutions for the upper branch were stable, while the solutions for the lower branch were unstable. Moreover, shrinking parameter contributes significantly to exhibit the dual nature of the solutions. Due to the increment in the heat generation/absorption and temperature ratio, the kinetic energy is inclined, which causes the temperature distribution to rise for both branches. For stable branches, an increase in wall stress values is evident as a result of permeability and stretching of sheet, whereas unstable branches show the opposite trend.

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Increasing heat transfer in flat plate solar collectors using various forms of turbulence-inducing elements and CNTs-CuO hybrid nanofluids

Cited by 38 publications

References 36 publications

Evaluation of Energy Performances of Solar Dryers

Evaluation of Energy Performances of Solar Dryers

Numerical Study of Heat Transfer Enhancement with Nanofluid in Rectangular Duct.

Multiple solutions for non-linear radiative mixed convective hybrid nanofluid flow over an exponentially shrinking surface

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