Fluid-induced vibration evolution mechanism of multiphase free sink vortex and the multi-source vibration sensing method

Li, Lin; Wei-xin, Xu; Tan, Yunfeng; Yang, Yue; Yang, Jianguo; Tan, Dapeng

doi:10.1016/j.ymssp.2022.110058

Cited by 71 publications

(49 citation statements)

References 51 publications

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“…The physical scales of the mixed spaces are larger than that of the materials. The complex cyclic and turbulent flow provides critical technical challenges to the optimal design of the mixed actuator and boundary condition control of the mixing process [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Material Transport and Flow Pattern Characteristics of Gas–Liquid–Solid Mixed Flows

Chen

et al. 2023

Processes

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Flow pattern monitoring of gas–liquid–solid mixed flow has great significance to enhance the quality and efficiency of material mixing, and the material transport mechanism and dynamic control strategy are faced with significant challenges. To solve these problems, a computational fluid mechanics and discrete element method (CFD-DEM) coupling modeling and solving approach based on soft sphere and porous models is presented to explore material transport mechanisms. The user-defined function (UDF) is adopted to perform data communication, and the porosity of the porous model is calculated to achieve the bidirectional calculation of Eulerian fluid and Lagrange particle phases. Material transport processes of gas–liquid–solid mixed flows are discussed to explore material transport mechanisms of particle flow and the flow pattern evolution laws under the inflation control are obtained. The results show that the particles are not evenly distributed under the synergistic action of impeller rotation and inflation. The particles in the upper and lower impeller have similar characteristics along the radial direction, and there is an aggregation phenomenon in the impeller center. A certain degree of inflation enhances the macroscopic mixing process of turbulent vortices, promotes the particle suspension effect inside the container, and improves the material transport efficiency inside the mixing space. Relevant research results can provide theoretical references for the material transport mechanism, flow pattern tracking models, and energy transfer and can also provide technical support for chemical process separation, food processing, battery homogenate mixing, and other production processes.

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Section: Introductionmentioning

confidence: 99%

Material Transport and Flow Pattern Characteristics of Gas–Liquid–Solid Mixed Flows

Chen

et al. 2023

Processes

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“…To obtain higher thermal efficiency and reduce the emission of carbon dioxide, the most advanced generation‐IV nuclear reactor is aiming to operate stably at higher temperature 1–5 . In this operating condition, the accumulations of creep and creep‐fatigue (CF) interactive damages inevitably threaten the structural integrity of the generation‐IV nuclear reactors 6,7 .…”

Section: Introductionmentioning

confidence: 99%

“…To obtain higher thermal efficiency and reduce the emission of carbon dioxide, the most advanced generation-IV nuclear reactor is aiming to operate stably at higher temperature. [1][2][3][4][5] In this operating condition, the accumulations of creep and creep-fatigue (CF) interactive damages inevitably threaten the structural integrity of the generation-IV nuclear reactors. 6,7 Traditionally, martensitic steel and austenitic stainless steels are widely used for manufacture of critical components, which are operating in nuclear reactors.…”

Section: Introductionmentioning

confidence: 99%

Nanoindentation characterization on competing propagation between the transgranular and intergranular cracking of 316H steel under creep‐fatigue loading

Song

Pan

et al. 2023

Fatigue Fract Eng Mat Struct

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316H austenitic stainless is regarded as an excellent candidate in the most advanced generation of nuclear reactor at elevated temperature. The effects of dwell times and strain amplitudes on the creep‐fatigue (CF) fracture mechanism of 316H steel were studied by using nanoindentation. The cyclic lives are observed to decrease with increasing strain amplitudes, while they are insensitive to the variation in dwell times. In comparison to the as‐received specimen, the nano‐hardness was evidently enhanced in both the fracture and interior regions for the CF‐tested one, whereas elastic modulus was little changed. As related to the creep resistance, creep flow could be suppressed with increasing strain amplitudes and dwell times, especially for the fracture edge. And the correlation between strain rate sensitivity (m) during creep flow and CF testing conditions was obtained. Based on the morphologies of fracture surface and variation in H, E, and m, a normalized damage indicator ln(H/E)/m is proposed to characterize the competing propagation of the transgranular (fatigue damage) and intergranular (creep damage) cracking in the CF fracture.

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“…25,26 Moreover, it is necessary to consider the accurate solution process of the dynamic coupling between the structural wall and the strong turbulence model near the submarine. [28][29][30] In addition, the studied object is not a pure shell, which means the influence of ringstiffeners on the structure should be considered. Bai et al compares and analyzes the influence of ringstiffeners on the bearing capacity and steadiness of submerged shell structures.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the dynamic behavior of the ring-stiffened double-shell structure due to subsea collisions

Wang,

Zhang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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The ring-stiffened double-shell structure is currently widely utilized in the equipment for ocean engineering, of which the response analysis under subsea impact is important to accomplish the safety and highly difficult Marine missions. However, due to the complex characteristics of the research object including fluid-solid coupling contact, large deformation, short response time, and multiplet structure, the dynamic behavior of the impacted ring-stiffened double-shell structure is hard to analyze accurately by traditional numerical methods. To overcome challenges, a fresh modeling and solving approach for the impacting mechanism of the structure body is put forward by this paper. The method is based on the Arbitrary Lagrange-Euler and Fluid-Structure-Interaction (ALE-FSI) theory. A stiffness matrix of a penalty function and steady outer pressure setting is presented to build the underwater interaction model. Then, the ALE-based description method is proposed to simulate the collision process. The results indicate that the adopted modeling and solving methods for the subsea structural collision have better revealed the dynamic response process of subsea structure to impact. There isn’t any evident damage spreading to the surrounding region, and the structural damage is primarily contained in the collision area. When an underwater impact is applied to the double shell structure, the non-pressure shell provides better protection. The core academic achievement of this work is providing an effective approach for subsea impacting mechanism and nonlinear dynamic response of ring-stiffened double-shell structure which can be used in different scenarios. It can offer universal references to optimize the construction of underwater equipment and determine the level of impact damage to submarines.

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Fluid-induced vibration evolution mechanism of multiphase free sink vortex and the multi-source vibration sensing method

Cited by 71 publications

References 51 publications

Material Transport and Flow Pattern Characteristics of Gas–Liquid–Solid Mixed Flows

Material Transport and Flow Pattern Characteristics of Gas–Liquid–Solid Mixed Flows

Nanoindentation characterization on competing propagation between the transgranular and intergranular cracking of 316H steel under creep‐fatigue loading

Investigation on the dynamic behavior of the ring-stiffened double-shell structure due to subsea collisions

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