Numerical Study of Turbulent Helical Pipe Flow With Comparison to the Experimental Results

Datta, Anup Kumer; Hayamizu, Yasutaka; Kouchi, Toshinori; Nagata, Yasunori; Yamamoto, Kazuomi; Yanase, Shinichiro

doi:10.1115/1.4036477

Cited by 13 publications

(4 citation statements)

References 21 publications

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“…Recently, with the improvement of computer hardware, CFD technology has been rapidly developed. Tang et al [31], Nobari et al [32], Datta et al [33] and Cheng et al [34] carried out numerical simulations to explore the velocity distribution, pressure field, etc.…”

Section: Quasi-static Modelmentioning

confidence: 99%

“…Thus, with the help of CFD solvers, Tang et al [31] and Nobari et al [32] carried out numerical simulations to explore the velocity distribution, pressure field, and secondary flow in a helical tube by varying the coil parameters, such as the coil pitch, curvature radius and Dean number. Datta et al [33] explored the turbulent helical duct flow by experiment and simulation. Cheng et al [34] investigated the flow characteristics in helical ducts with varying Reynolds numbers and geometric parameters, including the coil radius, pipe diameter and coil pitch.…”

Section: Introductionmentioning

confidence: 99%

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Numerical and experimental study of a novel GER fluid damper based on helical duct flow

Zhao¹,

Cao²,

Jing³

et al. 2022

Smart Mater. Struct.

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The beneﬁts of giant electrorheological ﬂuids (GER ﬂuids) have been harnessed to enhance their eﬀect in damping force generation. However, few results have been reported on the issue of taking advantage of a helical duct ﬂow in improving the performance of a GER-based damper in generating and tuning damping eﬀects. In this study, an innovative GER ﬂuid-based damper with helical ﬂow ducts is proposed. The proposed ﬂow mode can achieve a greater pressure gradient during operation, and, thus, improve the damping performance by enlargement of the length of the active region with more compact dimensions. A mathematical model aiming to explain the mechanical properties of the damper is investigated based on the continuity equation and Navier–Stokes equations. Then, simulation studies based on computational ﬂuid dynamics (CFD) solvers are conducted to verify the eﬀectiveness of the mathematical model. Additionally, an experimental prototype of the GER ﬂuid damper is fabricated, and damping force measurements under diﬀerent excitations are carried out. The experimental results agree well with the results obtained from theoretical analysis and CFD solvers. The regulation coeﬃcient that illustrates the tunable range of the damping force is found to reach a value of 8 times under an electric ﬁeld ranging from 0 to 1 kV/mm.

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Section: Quasi-static Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical and experimental study of a novel GER fluid damper based on helical duct flow

Zhao¹,

Cao²,

Jing³

et al. 2022

Smart Mater. Struct.

View full text Add to dashboard Cite

show abstract

“…Hayamizu 15 and Yi and Liu 16 performed the flow and heat transfer of water in a spiral bend pipe with an inner diameter of 20 mm, and it was found that the Dean vortex core of the secondary flow moved toward the elbow with the increase of the fluid Reynolds number at the inlet. When the curvature ratio of the spiral elbow was within 0.1–0.15 and the fluid Reynolds number was within 2280–6000, the heat transfer performance of the spiral elbow was the best.…”

Section: Introductionmentioning

confidence: 99%

Study on Continuous Hydrolysis in a Microchannel Reactor for the Production of Titanium Dioxide by a Sulfuric Acid Process

Chang

Chen²,

Dou³

et al. 2022

ACS Omega

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The development of a continuous hydrolysis process of titanium sulfate is an innovation to the traditional production process of titanium dioxide by the sulfuric acid process. In the experiment, a microchannel reactor was designed, and the hydrolysis rate of titanium sulfate, the particle size, and particle size distribution of metatitanic acid agglomerates were used as indicators to investigate the effect of operating conditions on the continuous hydrolysis of titanium sulfate. The results have shown that as the amount of dilution water increased, the hydrolysis rate of titanium sulfate decreased, and the particle size of primary aggregates of metatitanic acid increased from 39 to 54 nm. As the alkali mass concentration of dilution water increased, the hydrolysis rate of titanyl sulfate increased, and the particle size of primary aggregates of metastatic acid first decreased and then increased, and the particle size range was 40–48 nm. As the flow rate increased, the hydrolysis rate of titanyl sulfate increased, and the particle size of primary aggregates of metatitanic acid dropped from 59 to 43 nm. Compared with the batch hydrolysis operation, the continuous process has stronger anti-disturbance ability, significantly shorter operation time of the reaction section, and narrower particle size distribution of the product metatitanic acid.

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“…Mondal et al [29,30] compared their numerical results with the experimental data of Chandratilleke et al [31] and visualized the stream functions and the isotherms for different Dean, Grashof, and Taylor numbers. Datta et al [32] studied the helical curved duct numerically as well as experimentally. The buoyancy forces in the curved duct are converted into the driving force for the secondary flow which was obtained by Wang et al [33].…”

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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Numerical Study of Turbulent Helical Pipe Flow With Comparison to the Experimental Results

Cited by 13 publications

References 21 publications

Numerical and experimental study of a novel GER fluid damper based on helical duct flow

Numerical and experimental study of a novel GER fluid damper based on helical duct flow

Study on Continuous Hydrolysis in a Microchannel Reactor for the Production of Titanium Dioxide by a Sulfuric Acid Process

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

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