Entropy in Nanofluids

Lorenzini, Giulio; Mahian, Omid

doi:10.3390/e20050339

Cited by 5 publications

(3 citation statements)

References 27 publications

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“…Bejan established entropy generation minimization theory [ 1 , 2 ], which measures the performance of the heat transfer process by evaluating the degree of irreversible loss of energy and provides a new evaluation method for thermodynamic optimization. Since the entropy generation minimization theory was proposed, it has been widely used in heat conduction [ 3 , 4 , 5 , 6 , 7 , 8 ], fins [ 9 , 10 , 11 , 12 , 13 , 14 ], heat exchangers [ 15 , 16 , 17 , 18 , 19 , 20 ], and heat sinks [ 21 , 22 , 23 , 24 , 25 , 26 ]. The constructal theory [ 27 , 28 , 29 ] optimizes problems by following the idea that the structure of things develops in the direction of better internal flow performance, which provides a new method for traditional thermodynamic optimization problems.…”

Section: Introductionmentioning

confidence: 99%

Multi-Objective Constructal Design for Quadrilateral Heat Generation Body with Vein-Shaped High Thermal Conductivity Channel

Zhu

Chen

et al. 2022

Entropy

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Based on the quadrilateral heat generation body (HGB) proposed by previous literature, the multi-objective constructal design is performed. Firstly, the constructal design is performed by minimizing the complex function composed of the maximum temperature difference (MTD) and entropy generation rate (EGR), and the influence of the weighting coefficient (a0) on the optimal constructal is studied. Secondly, the multi-objective optimization (MOO) with the MTD and EGR as optimization objectives is performed, and the Pareto frontier with an optimal set is obtained by using NSGA-II. The optimization results are selected from the Pareto frontier through LINMAP, TOPSIS, and Shannon Entropy decision methods, and the deviation indexes of different objectives and decision methods are compared. The research of the quadrilateral HGB shows that the optimal constructal can be gained by minimizing the complex function with the objectives of the MTD and the EGR, the complex function after the constructal design is reduced by up to 2% compared with its initial value, and the complex function of the two reflects the compromise between the maximum thermal resistance and the irreversible loss of heat transfer. The Pareto frontier includes the optimization results of different objectives, and when the weighting coefficient of a complex function changes, the optimization results obtained by minimizing the complex function will also be distributed in the Pareto frontier. The deviation index of the TOPSIS decision method is 0.127, which is the lowest one among the discussed decision methods.

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Section: Introductionmentioning

confidence: 99%

Multi-Objective Constructal Design for Quadrilateral Heat Generation Body with Vein-Shaped High Thermal Conductivity Channel

Zhu

Chen

et al. 2022

Entropy

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“…Entropy generation minimization [ 52 , 53 ] and the principle of least action [ 54 , 55 , 56 ] are two important methods to study the performance optimization of a thermal system. Some efforts have been made to research into the entropy generation of different thermal systems [ 23 , 37 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 ]. Khan et al [ 59 ] studied the performance of MCHS using an entropy generation minimization procedure, and proposed a general expression evaluating irreversibilities.…”

Section: Introductionmentioning

confidence: 99%

“…Awad [ 60 ] amply reviewed thermodynamic optimization studies of microchannels based on entropy generation analysis. Some suggestions for future work were put forward by Lorenzini and Mahian [ 67 ] in the field of entropy generation in nanofluid flows.…”

Section: Introductionmentioning

confidence: 99%

Fluid Flow and Entropy Generation Analysis of Al2O3–Water Nanofluid in Microchannel Plate Fin Heat Sinks

Duan

et al. 2019

Entropy

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The flow in channels of microdevices is usually in the developing regime. Three-dimensional laminar flow characteristics of a nanofluid in microchannel plate fin heat sinks are investigated numerically in this paper. Deionized water and Al2O3–water nanofluid are employed as the cooling fluid in our work. The effects of the Reynolds number (100 < Re < 1000), channel aspect ratio (0 < ε < 1), and nanoparticle volume fraction (0.5% < Φ < 5%) on pressure drop and entropy generation in microchannel plate fin heat sinks are examined in detail. Herein, the general expression of the entropy generation rate considering entrance effects is developed. The results revealed that the frictional entropy generation and pressure drop increase as nanoparticle volume fraction and Reynolds number increase, while decrease as the channel aspect ratio increases. When the nanoparticle volume fraction increases from 0 to 3% at Re = 500, the pressure drop of microchannel plate fin heat sinks with ε = 0.5 increases by 9%. It is demonstrated that the effect of the entrance region is crucial for evaluating the performance of microchannel plate fin heat sinks. The study may shed some light on the design and optimization of microchannel heat sinks.

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Optimal design of geometrical parameters and flow characteristics for Al2O3/water nanofluid inside corrugated heat exchangers by using entropy generation minimization and genetic algorithm methods

Ebrahimi‐Moghadam

Moghadam

2019

Applied Thermal Engineering

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Entropy in Nanofluids

Cited by 5 publications

References 27 publications

Multi-Objective Constructal Design for Quadrilateral Heat Generation Body with Vein-Shaped High Thermal Conductivity Channel

Multi-Objective Constructal Design for Quadrilateral Heat Generation Body with Vein-Shaped High Thermal Conductivity Channel

Fluid Flow and Entropy Generation Analysis of Al2O3–Water Nanofluid in Microchannel Plate Fin Heat Sinks

Optimal design of geometrical parameters and flow characteristics for Al2O3/water nanofluid inside corrugated heat exchangers by using entropy generation minimization and genetic algorithm methods

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