Investigation on Energy Distribution in Steady and Unsteady Flow Instabilities through a Bend Square Pipe

Hasan, Mohammad Sanjeed; Rashid, Sabrina Mohd; Dolon, Shamsun Naher; Chanda, Ratan Kumar; Islam, Md. Minarul; Mondal, Rabindra Nath; Lorenzini, Giulio

doi:10.31181/rme200102086h

Cited by 7 publications

(3 citation statements)

References 47 publications

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“…ey considered five suppliers as alternatives and nine evaluation criteria to ensure the execution of procurement process to be more effective. e other related articles reporting the decision analysis include Gayathri and Nagaraju [18], Varun et al [19], Hasan et al [20], and Ali et al [21].…”

Section: Literature Reviewmentioning

confidence: 99%

Semantic Approach for Evaluation of Energy Storage Technologies under Fuzzy Environment

Nagaraju

Chiranjeevi

Sekhar

et al. 2022

Advances in Fuzzy Systems

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Energy storage systems are becoming increasingly important, with a growing focus on renewable energy sources that provide highly fluctuating output. Therefore, sound decisions regarding the energy storage systems to be employed need to be made, especially with a systematic and semantic approach. This paper considers the problem of evaluation and selection of energy storage technologies (ESTs). The objective of the proposed research is to decide the best technology for energy storage under the novel idea of hybrid multicriteria decision-making technique under fuzzy environment, that is, fuzzy AHP with fuzzy VIKOR. Electrochemical storage, electrical storage, magnetic storage, mechanical storage, and chemical storage are considered as five alternative energy storage technologies. Energy density, life cycles, cycle efficiency, investment level, suitability to climatic conditions, and required space are considered as six main evaluation criteria. Under each of the main criteria, a set of subcriteria are also considered. The weights of main criteria and subcriteria are determined using fuzzy AHP. With the help of the weights of each set of subcriteria, the weights of alternatives are determined using fuzzy VIKOR. Further, with the help of the main criteria weights and the weights of alternatives determined with respect to each set of subcriteria, the final normalized weights of alternatives are determined. Based on these weights, energy storage technologies are ranked. In addition, the sensitivity analysis is carried out to analyze the variation in ranking pattern of alternatives. From the research findings of this paper, the results are found to be more practical as the evaluation is carried out on an objective basis.

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Section: Literature Reviewmentioning

confidence: 99%

Semantic Approach for Evaluation of Energy Storage Technologies under Fuzzy Environment

Nagaraju

Chiranjeevi

Sekhar

et al. 2022

Advances in Fuzzy Systems

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“…In practice, rotating thermal flux frequently occurs in a variety of rotational setups. A wide range of studies [4][5][6][7][8] has been conducted to analyze the flow and heat transfer for the rotational/non-rotating domain.…”

Section: Nomenclaturementioning

confidence: 99%

Impacts of Rotation on Unsteady Fluid Flow and Energy Distribution through a Bending Duct with Rectangular Cross Section

Islam¹,

Mondal²,

Saha³

2022

Energy Engineering

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A depth understanding of fluid flow past a curved duct having rectangular cross-section with different aspect ratios (l) are essential for various engineering applications such as in chemical, mechanical, biomechanical and bio-medical engineering. So highly ambitious researchers have given significant attention to study new characteristics of fluid flow in a curved duct. The flow characterization in the rectangular duct has been studied over a wide range of numerical and selective experimental studies. However, proper knowledge with the effects of Coriolis force for different aspect ratios is important for better understanding of the transitional behaviour and the subsequent heat generation, which is required to improve further. The purpose of this study is to reveal insight into the transitional flow pattern and heat transfer in a curved rectangular domain. The Navier-Stokes equations are solved using the spectral method, while the Crank-Nicolson method is used to solve the energy equation. An in-house FORTRAN code is developed to get the numerical solution. For post-processing purposes, Tecplot-360 and Ghost-script tools are used. The present study exposes development of Dean vortices that affect heat generation as well as thermal enhancement in the flow with underlying the flow controlling parameters, the Dean number (Dn), the Grashof number (Gr) and the Taylor number (Tr). Time-dependent results followed by phase spaces show that transient flow undergoes in the scenario 'chaotic → multi-periodic→ periodic → steady-state' generating 2-to 8-vortices for the periodic/multi-periodic flow at 2000 ≤ Tr ≤ 2205 for l = 2, whereas similar sort of flow is observed in the range of 3100 ≤ Tr ≤ 3195 for l = 3. More complicated 4-to 13-vortex solutions are obtained for the chaotic flow regime at l = 2 in the range of 0 ≤ Tr < 2200 and at l = 3 in the range of 0 ≤ Tr < 3100. The chaotic flow that occurs at the certain range of Tr proficiently intensifies the heat transfer than the unperturbed, periodic or multi-periodic flow. The overall investigation reveals that in the rotating duct, the temperature-influenced buoyancy compulsion and centrifugal-coriolis joint forces are dominant, influencing the characteristic of the fluid and thus optimizing the transfer of heat. The present investigation will contribute to enhancing the understanding of fluid flow and heat transfer of internal heating/cooling/gas turbines, electric generators, biological systems, and some separation processes.

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“…Three-dimensional bifurcation structures of the curved square duct were studied by Watanabe and Yanase [12]. Hasan et al [13,14] obtained the two-and four-different steady solution structures of the rotating and non-rotating curved duct, respectively, when the temperature difference was located at the top and bottom walls.…”

Section: Introductionmentioning

confidence: 99%

Effects of Rotation on Transient Fluid Flow and Heat Transfer Through a Curved Square Duct: The Case of Negative Rotation

Hasan

Mollah

Kumar

et al. 2021

International Journal of Applied Mechanics and Engineering

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The fluid flow and heat transfer through a rotating curved duct has received much attention in recent years because of vast applications in mechanical devices. It is noticed that there occur two different types of rotations in a rotating curved duct such as positive and negative rotation. The positive rotation through the curved duct is widely investigated while the investigation on the negative rotation is rarely available. The paper investigates the influence of negative rotation for a wide range of Taylor number (−10 ≤ Tr ≤ −2500) when the duct itself rotates about the center of curvature. Due to the rotation, three types of forces including Coriolis, centrifugal, and buoyancy forces are generated. The study focuses and explains the combined effect of these forces on the fluid flow in details. First, the linear stability of the steady solution is performed. An unsteady solution is then obtained by time-evolution calculation and flow transition is determined by calculating phase space and power spectrum. When Tr is raised in the negative direction, the flow behavior shows different flow instabilities including steady-state, periodic, multi-periodic, and chaotic oscillations. Furthermore, the pattern variations of axial and secondary flow velocity and isotherms are obtained, and it is found that there is a strong interaction between the flow velocities and the isotherms. Then temperature gradients are calculated which show that the fluid mixing and the acts of secondary flow have a strong influence on heat transfer in the fluid. Diagrams of unsteady flow and vortex structure are further sketched and precisely elucidate the curvature effects on unsteady fluid flow. Finally, a comparison between the numerical and experimental data is discussed which demonstrates that both data coincide with each other.

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Investigation on Energy Distribution in Steady and Unsteady Flow Instabilities through a Bend Square Pipe

Cited by 7 publications

References 47 publications

Semantic Approach for Evaluation of Energy Storage Technologies under Fuzzy Environment

Semantic Approach for Evaluation of Energy Storage Technologies under Fuzzy Environment

Impacts of Rotation on Unsteady Fluid Flow and Energy Distribution through a Bending Duct with Rectangular Cross Section

Effects of Rotation on Transient Fluid Flow and Heat Transfer Through a Curved Square Duct: The Case of Negative Rotation

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