Numerical study on the thermal performance of the shell and tube heat exchanger using twisted tubes and Al2O3 nanoparticles

Ghazanfari, Valiyollah; Imani, Morteza; Shadman, Mohammad Mahdi; Amini, Younes; Zahakifar, Fazel

doi:10.1016/j.pnucene.2022.104526

Cited by 64 publications

(16 citation statements)

References 27 publications

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“…It is observed that the average deviation of our data with other works is less than 6%. Validation of computational studies have been done in several previous works [45][46][47][48][49][50][51][52][53][54][55] Figure 4 displays the flow stream and concentration of the coolant gas (He and CO 2 ) for injection system released from the tip of disk located on the spike. As expected, the formation of the circulations in the cavity is main flow physic of the proposed configurations.…”

Section: Resultsmentioning

confidence: 99%

Numerical investigation of compressible flow around nose cone with Multi-row disk and multi coolant jets

Iranmanesh

Alizadeh

Faraji

et al. 2023

Sci Rep

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Due to sever aerodynamic heating, the protection of forebody of scramjet is crucial for hypersonic flight. In present work, a new cooling system is proposed and investigated for the protection of nose cone at hypersonic flight. Computational fluid dynamic is used for the simulation of the lateral and axial coolant jet released from the spike at high-velocity condition. The primary goal is to find optimum jet location for efficient cooling of nose and spike assembly. Influence of two coolant jets (Carbon dioxide and Helium) on the mechanism of cooling system are fully investigated. For simulation, RANS equations are coupled with species transport equation and SST turbulence model. Two different jet configurations (axial disk positions) are investigated to obtain efficient condition for protection of nose cone at hypersonic flight. Our results indicate that the presence of the spike on the nose cone decreases pressure up to 33% on the main body and the shifts the maximum pressure to higher angles because of the deflection of the air stream. Maximum pressure drops about 50% by injection of the coolant disk jet (C2) at angle of 55 deg.

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Section: Resultsmentioning

confidence: 99%

Numerical investigation of compressible flow around nose cone with Multi-row disk and multi coolant jets

Iranmanesh

Alizadeh

Faraji

et al. 2023

Sci Rep

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“…In recent decades, nanomaterials are used in solar cells 22 , catalytic reactions 23 , heat exchangers 24 , wastewater treatment 25 , energy application 26 , and system sensing 27 . A diversity of mainly nanosized metal oxides, including tungsten oxide 28 , zinc oxide 29 , cobalt oxide 30 , iron oxide 31 , copper oxide 32 , bismuth oxide 33 , samarium oxide 34 , and indium oxide 35 have already been used to fabricate acetone-detecting sensors.…”

mentioning

confidence: 99%

Wavelet-artificial neural network to predict the acetone sensing by indium oxide/iron oxide nanocomposites

Iranmanesh

Pourahmad

Shabestani

et al. 2023

Sci Rep

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This study applies a hybridized wavelet transform-artificial neural network (WT-ANN) model to simulate the acetone detecting ability of the Indium oxide/Iron oxide (In2O3/Fe2O3) nanocomposite sensors. The WT-ANN has been constructed to extract the sensor resistance ratio (SRR) in the air with respect to the acetone from the nanocomposite chemistry, operating temperature, and acetone concentration. The performed sensitivity analyses demonstrate that a single hidden layer WT-ANN with nine nodes is the highest accurate model for automating the acetone-detecting ability of the In2O3/Fe2O3 sensors. Furthermore, the genetic algorithm has fine-tuned the shape-related parameters of the B-spline wavelet transfer function. This model accurately predicts the SRR of the 119 nanocomposite sensors with a mean absolute error of 0.7, absolute average relative deviation of 10.12%, root mean squared error of 1.14, and correlation coefficient of 0.95813. The In2O3-based nanocomposite with a 15 mol percent of Fe2O3 is the best sensor for detecting acetone at wide temperatures and concentration ranges. This type of reliable estimator is a step toward fully automating the gas-detecting ability of In2O3/Fe2O3 nanocomposite sensors.

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“…In the case of chemical absorption, the steady‐state continuity equation for each component involved in the simultaneous transfer of mass and chemical reaction in the reactive absorption system can be expressed using Eq. 1 72–76:

true - \nabla N_{i} \pm R_{i} = V_{z} \frac{\partial C_{i}}{\partial z}

…”

Section: Methods Of Model Developmentmentioning

confidence: 99%

Computational Fluid Dynamics Simulation of a Membrane Contactor for CO₂ Separation: Two Types of Membrane Evaluation

Alborzi¹,

Amini

Amirabedi³

et al. 2023

Chem Eng & Technol

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Two different types of hollow‐fiber membrane contactors were used for CO2 separation from the gas stream with monoethanolamine (MEA) absorbent and numerically investigated. After the model validation with experimental data, CO2 removal efficiency, MEA concentration, and pressure drop variation were examined under different conditions by variation of some effective parameters such as gas stream velocity, absorption solution velocity, membrane porosity, and membrane tortuosity. Membrane tortuosity and porosity enhancement led to light decrease and light increase in CO2 removal efficiency, respectively, but gas stream velocity enhancement significantly reduced the CO2 removal efficiency.

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Numerical study on the thermal performance of the shell and tube heat exchanger using twisted tubes and Al2O3 nanoparticles

Cited by 64 publications

References 27 publications

Numerical investigation of compressible flow around nose cone with Multi-row disk and multi coolant jets

Numerical investigation of compressible flow around nose cone with Multi-row disk and multi coolant jets

Wavelet-artificial neural network to predict the acetone sensing by indium oxide/iron oxide nanocomposites

Computational Fluid Dynamics Simulation of a Membrane Contactor for CO₂ Separation: Two Types of Membrane Evaluation

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Numerical study on the thermal performance of the shell and tube heat exchanger using twisted tubes and Al2O3 nanoparticles

Cited by 64 publications

References 27 publications

Numerical investigation of compressible flow around nose cone with Multi-row disk and multi coolant jets

Numerical investigation of compressible flow around nose cone with Multi-row disk and multi coolant jets

Wavelet-artificial neural network to predict the acetone sensing by indium oxide/iron oxide nanocomposites

Computational Fluid Dynamics Simulation of a Membrane Contactor for CO2 Separation: Two Types of Membrane Evaluation

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Product

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Computational Fluid Dynamics Simulation of a Membrane Contactor for CO₂ Separation: Two Types of Membrane Evaluation