Influence of swirling flow on mass and momentum transfer downstream of a pipe with elbow and orifice

Takano, Tsuyoshi; Ikarashi, Yuya; Uchiyama, Kazuya; Yamagata, Takayuki; Fujisawa, Nobuyuki

doi:10.1016/j.ijheatmasstransfer.2015.08.087

Cited by 29 publications

(7 citation statements)

References 25 publications

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“…With the pipe rotation, the growth of the boundary layer on the pipe walls establishes an azimuthal velocity distribution corresponding to the solid-body rotation in the core. The rotary swirling allows the solid rotation of the small tubes in the peripheral direction, while the function generates the uniform axial velocity distribution [31]. Figure 20 represents the measurement result in swirling flow.…”

Section: Three-dimensional Measurement In Turbulent and Swirling Pipe...mentioning

confidence: 99%

Three-Dimensional Velocity Distribution Measurement Using Ultrasonic Velocity Profiler with Developed Transducer

Shoji¹,

Kikura²,

Takahashi³

et al. 2022

JFCMV

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This study describes an ultrasonic velocity profiler that uses a new ultrasonic array transducer with unique 5-element configuration, with all five elements acting as transmitters and four elements as receivers. The receivers are designed to reduce the amount of uncertainty. As the fluid moves through this setup, four Doppler frequencies are obtained. The multi-dimensional velocity information along the measurement line can be reconstructed. The transducer has a compact geometry suitable for a wide range of applications, including narrow flow areas. The transducer's basic frequency and sound pressure are selected and evaluated to be compatible with the application. First, to confirm the measurement ability, the measurement of the developed system in two-dimensional flow is validated by comparing it to the theoretical data. The uncertainty of measurement was within 15%. Second, the three-dimensional measurement in turbulent and swirling flow is proved experimentally to check the applicability of the proposed technique.

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Section: Three-dimensional Measurement In Turbulent and Swirling Pipe...mentioning

confidence: 99%

Three-Dimensional Velocity Distribution Measurement Using Ultrasonic Velocity Profiler with Developed Transducer

Shoji¹,

Kikura²,

Takahashi³

et al. 2022

JFCMV

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show abstract

“…Swirling flows are widely used in the practical applications such as separation, mixing, and flame stabilization, 13 to intensify the mass, momentum, and heat transfer process. Takano et al 14 found that the maximum mass‐transfer coefficient by adding swirling flow could reach six times larger than that of the straight pipe without swirling. Palsson et al 15 found adding swirling flow into the heat exchanger pipes could increase the shear stress and reduce the fouling rate.…”

Section: Introductionmentioning

confidence: 99%

Liquid mixing intensification by adding swirling flow in the transverse jet mixer

Zhang

et al. 2021

AIChE Journal

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In this study, effect of swirling addition on the liquid mixing behavior of multiorifice‐impinging transverse jet mixer has been investigated by planar laser‐induced fluorescence as well as large eddy simulation (LES). In the case of swirling addition into the jet flow, there exists an optimized swirling jet angle or optimized jet‐to‐cross velocity ratio for the fixed mixer configuration. A larger swirling jet angle will make the flow dominated by the swirling, resulting in a slower mixing process. Interaction of swirling crossflow with no‐swirling‐injected streams, or with swirling‐injected streams in the opposite direction is beneficial for the mixing. LES predictions show that many small vortices are produced homogenously due to intensified impingement in the case of opposite swirling directions, leading to a relative fast mixing process in few milliseconds. Whereas the mixing is restrained when the swirling directions of two flows are the same.

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“…The influence of pipes shape on dust explosion could not be neglected, especially the dust deposition and lifting caused by the deformation structure, of which 90°bend pipe has the greatest influence. 7 Affected by the sparse wave and compression wave of the wall, the front surface of detonation wave is distorted around the bend. [8][9][10] In addition, the risk assessment study of dust explosion in these complex pipes should not only consider the factors and their interaction, but also calculate the contribution level of factors to the explosion risk value.…”

Section: Introductionmentioning

confidence: 99%

A risk assessment methodology of aluminum dust explosion for polishing process based on laboratory tests

Xie

Wang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part O:

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The secondary dust explosion ignited by the primary explosion energy often causes greater damage to the just destroyed carrier. Therefore, the study of explosion risk as well as the risk reduction effect with suppression is key guard against the secondary and derivative explosions. A novel risk assessment methodology is presented based on Monte Carlo theory for numerically fitting pressure’s uncertainty changes and Crystal ball simulation for calculating explosion risk and its distribution probability of hazardous explosive dust. Taking the aluminum dust of a polishing process as an example, the fitted results show that the tested explosion pressure in laboratory presents the shape of lognormal distribution with average pressure of 0.27 MPa on the condition of 500 g/m3 aluminum dust with median particle diameter at 35 μm. The simulated results show that the risk possibility of myringorupture injury, pneumorrhagia injury, and structure damage all approaches 100% because of the high explosion pressure considering the potential percentage of injury or damage at 50%. However, the risk possibility reduces to 14.27%, 0.13%, and 42.05% with suppressants of ammonium dihydrogen phosphate at 10%, respectively. The proposed method of risk assessment for dust explosion and its suppression provides scientific basis for strategy optimization of dust explosion protection and safe production of fine explosive dust related industry.

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Influence of swirling flow on mass and momentum transfer downstream of a pipe with elbow and orifice

Cited by 29 publications

References 25 publications

Three-Dimensional Velocity Distribution Measurement Using Ultrasonic Velocity Profiler with Developed Transducer

Three-Dimensional Velocity Distribution Measurement Using Ultrasonic Velocity Profiler with Developed Transducer

Liquid mixing intensification by adding swirling flow in the transverse jet mixer

A risk assessment methodology of aluminum dust explosion for polishing process based on laboratory tests

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