A Characteristic-based Numerical Simulation of Water-titanium Dioxide Nano-fluid in Closed Domains

Adibi, Tohid; Razavi, Seyed Esmail; Adibi, Omid

doi:10.5829/ije.2020.33.01a.18

Cited by 8 publications

(8 citation statements)

References 11 publications

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“…Different numerical studies were done for incompressible thermo-flows to survey the other ways to improve heat transfer rates. Adibi et al simulated thermo-flow using nano-fluids to enhance heat transfer rate [1]. Malik et al [2] studied two-dimensional incompressible flow along with a stretching cylinder.…”

Section: Introductionmentioning

confidence: 99%

Thermo-flow Analysis of Cylinder with Crossed Splitter Plates with a Characteristics-based Scheme

Razavi

Adibi

Hassanpour

2021

International Journal of Thermodynamics

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In the present work, the laminar flow through a circular cylinder with two crossed splitter plates is analyzed. The characteristic-based method has been used along with the unstructured grid. The current research has been done to detect the proper conditions according to the geometrical parameters in which the optimal heat transfer is taking place. Geometric control parameters are the angle of splitter plates (\theta) and the ratio of length of the splitter plate to cylinder radius (n=L/D). It was found that the use of a two-branched splitter plate is not wise in Reynolds number less than 100 due to its insignificant effect in flow properties. In angle 30° between two plates, the least drag force is witnessed with respect to other angles. Application of double branched splitter with angles more than 60° is not recommended, which will increase the total drag significantly. Since the splitter plate increases, the overall heat transfer from the cylinder and splitter set is enhanced. Minimum drag over the cylinder, and maximum convection drop from it is taken place when the dimension length is 0.75. Between dimensionless lengths 1.25 and 1.5, the Nusselt number oscillates with least amplitude and such behavior is also observed when two splitters are 60°apart.

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Section: Introductionmentioning

confidence: 99%

Thermo-flow Analysis of Cylinder with Crossed Splitter Plates with a Characteristics-based Scheme

Razavi

Adibi

Hassanpour

2021

International Journal of Thermodynamics

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“…Heat transfer enhancement techniques are widely used in many heating and cooling processes to improve the thermal performance of energy systems. With the development of nanotechnology, dispersing high conductive nanostructured materials in a transport medium such as conventional fluids has been considered as a promising method to enhance heat transfer [1]. The fabricated materials are usually called nanofluids which exhibit unique features especially in thermal conductivity and viscosity.…”

Section: Introductionmentioning

confidence: 99%

A neural network approach to estimate non-Newtonian behavior of nanofluid phase change material containing mesoporous silica particles

Motahar

2021

IJE

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Neural networks are powerful tools for evaluating the thermophysical characteristics of nanofluids to reduce the cost and time of experiments. Dynamic viscosity is an important property in nanofluids that usually needs to be accurately computed in heat transfer and nanofluid flow problems. In this paper, the rheological properties of nanofluid phase change material containing mesoporous silica nanoparticles are predicted by the artificial neural networks (ANNs) method based on the experimental database reported in literature. Experimental inputs include nanoparticle mass fractions (0-5 wt.%), temperatures (35-55℃), shear rates (10-200 s -1 ), targets include dynamic viscosities and shear stresses. A multilayer perceptron feedforward neural network with Levenberg-Marquardt back-propagation training algorithm is utilized to predict rheological properties. The optimal network architecture consists of 22 neurons in the hidden layer based on the minimum mean square error (MSE). The results showed that the developed ANN has an MSE of 6.67×10 -4 and 6.55×10 -3 for the training and test dataset, respectively. The predicted dynamic viscosity and shear stress also have the maximum relative error of 6.26 and 0.418%, respectively.

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“…Recycling power from the chimney outlet, using various fluids to transfer heat, modifying the combustion chamber, using a catalytic heater, using nanofluids, solar cells, temperature control equipment for the output of the heater, and controlling fuel consumption are some of the solutions. Using nano-fluids is another way to increases the heat transfer rate [2]. Natural gas is one of the primary sources of energy called sour gas when extracted from tanks containing impurities such as H2S and CO2.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Analysis on Thermal Performance of Gas Heater with Finned and Finless Tubes using Characteristics-based Method

Razavi

Adibi

Hassanpour

2021

IJE

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Natural gas must be preheated to prevent phase change and gas hydrate in pressure reduction stations. This paper aims to investigate the effect of the fins of gas tubes and their configuration, arrangement, and shape on the heat transfer and thermal efficiency of gas. To conduct a parametric study, two tube cases with fins and without fins, and in the finned case for the fin's configuration, two longitudinal and circular arrangements, and the formation of the fins, two solid and interrupted forms were analyzed. Also, three types of cross-sections, including rectangular, convergent parabolic, and divergent parabolic, for the shape of the fins have been studied. For this simulation, the three-dimensional, incompressible, and steady flow was considered, and for analysis and discretization of convective heat equations, the characteristic-based method was applied. FORTRAN software was also used to implement and solve the equations. The results show that in solid and interrupted fins and increasing the number of fins in parallel, the dimensionless heat transfer coefficient increases. Also, the dimensional heat transfer coefficient decreases with increasing the ratio of fin height to the tube's diameter. Also, the most significant heat transfer improvement was related to the divergent parabolic cross-section.

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A Characteristic-based Numerical Simulation of Water-titanium Dioxide Nano-fluid in Closed Domains

Cited by 8 publications

References 11 publications

Thermo-flow Analysis of Cylinder with Crossed Splitter Plates with a Characteristics-based Scheme

Thermo-flow Analysis of Cylinder with Crossed Splitter Plates with a Characteristics-based Scheme

A neural network approach to estimate non-Newtonian behavior of nanofluid phase change material containing mesoporous silica particles

Sensitivity Analysis on Thermal Performance of Gas Heater with Finned and Finless Tubes using Characteristics-based Method

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