Analysis of heat transfer and flow characteristics in typical cambered ducts

Zhang, Xilong; Zhang, Yongliang; Liu, Zunmin; Liu, Jiang

doi:10.1016/j.ijthermalsci.2019.106226

Cited by 63 publications

(11 citation statements)

References 17 publications

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“…Furthermore, an incompressible steady-state solution method was adopted for the internal part, and a second-order upwind difference scheme was chosen to discretize the governing equations. The pressure-velocity coupling and SIMPLE solution algorithm were selected in order to predict incompressible flow [28]. Boundary conditions were set as follows: for the flow field calculation, the suction-inlet vent, blowing-inlet, expansion area, and other boundary conditions were set as the pressure outlet, velocity inlet, pressure inlet, and wall surface, respectively.…”

Section: Algorithm Selection and Model Parameter Settingmentioning

confidence: 99%

Enhancement of particle collection efficiency considering the structural interplay: particle motion characteristics analysis

Yuan

Zhang

et al. 2020

Mechanics & Industry

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The vacuum-blowing cleaning system, utilizing positive and negative pressure mixed-delivery theory, has been adopted for the road sweeper vehicle. To enhance the solid particle separation performance and to evaluate the motion characteristics of inhaled particles under different structural parameters, the gas-solid flow in the vacuum-blowing cleaning system was investigated by using computational fluid dynamics (CFD) technology. The influence of the main structural parameters on the grade dust collection efficiency and average detention time of the inhaled particles was determined, such as suction-inlet diameter, suction-inlet inclination angle, and front baffle inclination angle. And the interplay between them was also investigated. In addition, a dust collection efficiency model was built, based on uniform design (UD) and multiple regression analysis (MRA), and subsequently verified via experiments. The results revealed that the structural parameters have significant influence on the dust collection performance. The suction-inlet diameter, front baffle inclination angle, and suction-inlet inclination angle exerted the highest, second-highest, and lowest influence, respectively. Furthermore, the interaction among structural parameters also influenced the collection performance. The highest, second-highest, and lowest levels of influence were determined for the inlet diameter/baffle inclination angle, inlet inclination angle/baffle inclination angle, and inlet diameter/inlet inclination interactions, respectively. The highest dust collection efficiency (i.e., 96.10%) and a short average detention time of particles in the chamber were realized under the following conditions: suction-inlet diameter and inclination angle: 200 mm and 110°, respectively, and front baffle inclination angle: 105°.

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Section: Algorithm Selection and Model Parameter Settingmentioning

confidence: 99%

Enhancement of particle collection efficiency considering the structural interplay: particle motion characteristics analysis

Yuan

Zhang

et al. 2020

Mechanics & Industry

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“…The finite volume analysis software Ansys Fluent [18] is used to simulate the centrifugal fan, and the flow field model of the fan is shown in Figure 5. The flow field model of fan is divided into three parts, which include inlet extension area, rotating fluid area, and outlet extension area.…”

Section: Grid Division and Definition Of The Boundarymentioning

confidence: 99%

Flow and Noise Characteristics of Centrifugal Fan in Low Pressure Environment

Zhang

2020

Processes

Self Cite

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The influence of low-pressure environment on centrifugal fan’s flow and noise characteristics was studied experimentally and numerically. A testbed was established to conduct the experimental test on the performance of a centrifugal fan, and the characteristic curve and power consumption curve of the fan under different pressure were obtained. Then the simulation model of the centrifugal fan was established, which was used to simulate the working process of centrifugal fan under different negative pressures. The results showed that the total pressure and static pressure of the fan decrease with the decrease of the ambient pressure. The total and static pressures of the fan under 60 kPa pressure condition decreased by 42.3% and 38.3%, respectively, compared with those of fan under the normal pressure. The main reason for this phenomenon is that the decrease of the environmental pressure leads to the decrease of air density. Besides, with the drop of environmental pressure, the sound pressure and sound power of the fan noise decreases.

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“…It was found that this could help prioritize maintenance efforts and optimize the use of human resources and other resources. As for the transportation of natural gas through pipelines [6], the risk analysis work must consider the physical and operational characteristics of the product, the failure mode, and its consequences, depending on each unexpected situation considered.…”

Section: Introductionmentioning

confidence: 99%

Risk and Income Evaluation Decision Model of PPP Project Based on Fuzzy Borda Method

Jing

2021

Mathematical Problems in Engineering

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In order to effectively analyze the risk-return decision-making model of PPP project by Yuan et al., (2020) this paper, based on the fuzzy Borda method and synergy effect theory, considers the synergistic effect of PPP project, constructs the model of investment risk sharing, incentive, and supervision punishment, and determines the investment risk sharing, incentive, and PPP project investment. This paper also aims to supervise and punish the decision-making mechanism to achieve the goals of the PPP project. The research results show that the increased synergy of project participants not only reduces the impact of investment risk on project revenue but also promotes project participants to increase their willingness to undertake risks, actively undertake project risks, and achieve synergy effects of PPP projects. Through the cooperation of both parties, the total income of PPP projects is increased. The research results show that the government chooses social capital participants with complementary advantages to form synergy as shown by Jiang et al. (2016); with the increase of synergy, the government needs to increase the incentive intensity, improve the performance behavior of social capital participants as proposed by Junlong et al. (2020), curb their speculation, and promote the two sides. Due to the increased synergy and the willingness of social capital participants to increase cooperation and reduce speculation, the government should reduce the intensity of supervision and punishment.

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Analysis of heat transfer and flow characteristics in typical cambered ducts

Cited by 63 publications

References 17 publications

Enhancement of particle collection efficiency considering the structural interplay: particle motion characteristics analysis

Enhancement of particle collection efficiency considering the structural interplay: particle motion characteristics analysis

Flow and Noise Characteristics of Centrifugal Fan in Low Pressure Environment

Risk and Income Evaluation Decision Model of PPP Project Based on Fuzzy Borda Method

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