Wall Stresses in Cylinder of Stationary Piped Carriage Using COMSOL Multiphysics

Yang, Xiaoni; Ma, Jun; Li, Yongye; Sun, Xihuan; Jia, Xiaomeng; Li, Yonggang

doi:10.3390/w11091910

Cited by 9 publications

(9 citation statements)

References 27 publications

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“…The experimental system was located in the Water Flow Test Hall of the Taiyuan University of Technology, as shown in Figure 2. It mainly consisted of conveying pipelines, power devices, testing devices, and recycling devices [15][16][17]. The dimensions of the conveying pipeline were: inner diameter 100 mm, wall thickness 5 mm, and length 15 m. The flow field testing area was 6.0 m away from the starting device and 5.5 m away from the outlet, meeting the conditions for a stable water flow operation [18,19].…”

Section: Experimental System and Methodsmentioning

confidence: 99%

The Dynamic Characteristics of a Piped Capsule Moving in a Straight Pipeline

Yang

et al. 2023

Water

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The hydraulic transportation of piped capsules is a new and energy-saving transportation mode, which is especially suitable for the long-distance and high-stability requirements of material transportation. In this paper, the COMSOL Multiphysics software was used to construct a mathematical model of the dynamic characteristics of a piped capsule moving in a straight pipeline, in which the boundary conditions were redeveloped, the inlet velocity distribution function was defined, and the physical experiment was carried out for verification. The dynamic characteristics were analyzed, and through the calculation of the energy consumption, the optimal piped capsule under the research conditions was obtained. The results show that the simulation results and experimental results for the piped capsule’s average moving velocity, axial velocity, and wall shear stress along the cylinder wall were basically consistent, with a maximum error of 14.22%, 2.62%, and 20.13%, respectively. With a decrease in the diameter-to-length ratio of the piped capsule, the axial velocity of the concentric annular gap flow decreased gradually. The area with a large shear stress was mainly concentrated at the front and rear ends of the cylinder wall, especially the rear area of the support feet of the piped capsule. With the increase in the diameter of the piped capsule, the wall shear stress of the capsule increased. Finally, the superior diameter-to-length ratio for the piped capsule under the research conditions was obtained and shown to be ε = 0.4. The research in this paper will provide a theoretical reference for the structural design and dynamic mechanism analysis of the piped capsule.

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Section: Experimental System and Methodsmentioning

confidence: 99%

The Dynamic Characteristics of a Piped Capsule Moving in a Straight Pipeline

Yang

et al. 2023

Water

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“…The model of the air outlet part of the riding-type tea plucking machine was meshed, and a reasonable turbulence model and solving parameters were selected. The three-dimensional numerical simulation [23,24] of the internal flow field of the air outlet part of the riding-type tea plucking machine was carried out. Through flow field analysis, the structure of the air outlet component is optimized.…”

Section: Numerical Calculationmentioning

confidence: 99%

CFD Simulation and Optimization of the Leaf Collecting Mechanism for the Riding-Type Tea Plucking Machine

Weng¹,

Tan

Wang³

et al. 2023

Agriculture

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In the process of tea plucking and leaf gathering, the structure optimization design of the leaf collecting mechanism is the key element responsible for collecting fresh leaves. The unreasonable design and manufacture of leaf collecting mechanisms will cause the smooth collection of fresh leaves, the quality of the collected fresh leaves will be damaged, and the commodity value will be reduced. In order to further study the structural characteristics of the leaf collecting mechanism, an air outlet model of the leaf collecting mechanism was established for the phenomena of internal vortex rotation and impact in the leaf collecting mechanism process. The internal flow field of the leaf collecting mechanism, the movement trajectory of fresh leaves, and the non-homogeneous flow are calculated using computational fluid dynamics (CFD). Based on Box-Behnken’s central combinatorial design theory, the velocity inlet and outlet air structure factors are taken as the influencing factors to carry out response surface test research. The effect of different parameters such as engine rotation, shape of the blowing cavity and air outlet parts, and velocity on the flow is determined. The optimal parameter combination is as follows: the height of the outlet end, the length of the inlet end, and the velocity inlet are 0.01 m, 0.03 m, and 25 m/s, respectively. Furthermore, it was found that when the number of plates increases from 1 to 4, the non-homogeneity decreases all the time, and the distribution of blowing air is improved without a sharp decrease in velocity. The average velocity outlet was larger than the velocity inlet, which meets the requirements of blade gathering. Considering comprehensively, the flow field simulation of the blade collecting mechanism with four baffles was consistent with the test results of the velocity outlet. The validation results showed that the model can successfully simulate the air flow inside the leaf-collecting mechanism, and the reasonable structure design was conducive to reducing the number of collisions between tea buds and improving the quality of tea buds. This research has certain theoretical and practical implications for the accurate plucking of high-quality tea.

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“…In order to verify the reliability of the numerical simulation results, an experimental study was conducted of the flow velocity characteristics in the pipe when the capsule was transported in the straight pipe section. The test device [35][36][37] was mainly composed of the centrifugal pump of the water supply device, the test pipeline, the capsule delivery device and receiving device, the turbine flow meter for measuring the flow discharge, the infrared sensor for measuring the capsule velocity, and the PDA (particle image velocimetry) for measuring the flow velocity in the pipeline. A schematic diagram of the test device is shown in Figure 4.…”

Section: Model Validationmentioning

confidence: 99%

Numerical Simulation of Flow Velocity Characteristics during Capsule Hydraulic Transportation in a Horizontal Pipe

Sun

et al. 2020

Water

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Capsule hydraulic transportation is a kind of low-carbon and environmentally friendly pipeline transportation technique. In this study, the flow velocity characteristics in the pipeline when the capsule is transported in a straight pipe section were simulated by adopting the RNG (Renormalization Group) k–ε turbulence model based on Fluent software and experimentally verified. The results showed that the simulated value of flow velocity in the pipeline was basically consistent with the experimental value during transportation of the material by the capsule, and the maximum relative error was no more than 6.7%, proving that it is feasible to use Fluent software to simulate the flow velocity characteristics in the pipeline when the capsule is transported in a straight pipe section. In the process of material transportation, the flow velocity distribution of the cross-section near the upstream and downstream sections of the capsule was basically the same, which increased with the increased length–diameter ratio of the capsule. The axial flow velocity was smaller in the middle of the pipe and larger near the inner wall of the pipe. From the inner wall to the center of the pipe, the radial flow velocity first increased and then decreased. The circumferential flow velocity was distributed in the vicinity of the support body of the capsule. The axial flow velocity of the annular gap section around the capsule first increased and then decreased from the inner wall of the pipe to the outer wall of the capsule. In the process of transporting materials, the influence of the capsule on the flow of its downstream section was greater than that of its upstream section. These results could provide a theoretical basis for optimizing the technical parameters of capsule hydraulic transportation.

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Wall Stresses in Cylinder of Stationary Piped Carriage Using COMSOL Multiphysics

Cited by 9 publications

References 27 publications

The Dynamic Characteristics of a Piped Capsule Moving in a Straight Pipeline

The Dynamic Characteristics of a Piped Capsule Moving in a Straight Pipeline

CFD Simulation and Optimization of the Leaf Collecting Mechanism for the Riding-Type Tea Plucking Machine

Numerical Simulation of Flow Velocity Characteristics during Capsule Hydraulic Transportation in a Horizontal Pipe

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