“…The figure that the volatility of the instantaneous velocity and temperature value obtained through experiments was relatively large, which may have been due to the impact of measurement accuracy. Overall, under different case conditions, the variation trend of the axial velocity and axial non-dimensional temperature obtained by the current numerical method was in good agreement with the experimental results of Huang et al 38 and the numerical simulation results of Zhuang et al 18 This method was further used to study the flow characteristics of gas–solid mixtures generated by the air gouging process.Figure 6.Comparison of experimental and simulation results for variation of axial velocity and temperature: (a) Variations in axial velocities with time; (b) Variations in the axial non-dimensional temperatures with time.…”
Section: Simulation Results and Analysissupporting
confidence: 88%
“…Some scholars have studied the buoyant jet generated by local pollution sources in industrial buildings. 37 The experiment results of Huang et al 38 and the simulation results of Zhuang et al 18 were used to verify the rationality of the simulation method that was adopted by this research. Amongst them, the room size of the experiment was 10.3(m) × 6.3(m) × 3.5(m) (length (X) × width (Y) × height (Z)), and the buoyant jet nozzle with a diameter d of 0.38 m was placed at 0.80 m from the ground.…”
Section: Simulation Results and Analysismentioning
The high-temperature particles produced by air gouging processes are common pollutants in cleaning workshops, which could endanger workers’ health. In this research, a two-way coupled Eulerian-Lagrangian method based on discrete phase modelling (DPM) was used to investigate the transport characteristics of high-temperature particles generated from air gouging processes. The particle group in the movement was divided into core zone and boundary zone, and the kinetic mechanism of particles in different zones was analysed. The results show particles in the boundary zone are more susceptible to the vortex entrainment effect than particles in the core zone, and some particles could be moved from the vortex diffusion zone to the vortex recirculation zone. The smaller the particle size, the better the followability to the hot airflow. The slower the temperature decay of particles, the more significant the thermophoresis effect, which could enhance the diffusion behaviour of the small particles. By analysing the average residence time of particles in the breathing zone, the influence of different factors on the average vertical diffusion height [Formula: see text] of particles is summarized, and a nonlinear regression prediction model of [Formula: see text] is established. The results can contribute to health risk assessment and industrial ventilation design.
“…The figure that the volatility of the instantaneous velocity and temperature value obtained through experiments was relatively large, which may have been due to the impact of measurement accuracy. Overall, under different case conditions, the variation trend of the axial velocity and axial non-dimensional temperature obtained by the current numerical method was in good agreement with the experimental results of Huang et al 38 and the numerical simulation results of Zhuang et al 18 This method was further used to study the flow characteristics of gas–solid mixtures generated by the air gouging process.Figure 6.Comparison of experimental and simulation results for variation of axial velocity and temperature: (a) Variations in axial velocities with time; (b) Variations in the axial non-dimensional temperatures with time.…”
Section: Simulation Results and Analysissupporting
confidence: 88%
“…Some scholars have studied the buoyant jet generated by local pollution sources in industrial buildings. 37 The experiment results of Huang et al 38 and the simulation results of Zhuang et al 18 were used to verify the rationality of the simulation method that was adopted by this research. Amongst them, the room size of the experiment was 10.3(m) × 6.3(m) × 3.5(m) (length (X) × width (Y) × height (Z)), and the buoyant jet nozzle with a diameter d of 0.38 m was placed at 0.80 m from the ground.…”
Section: Simulation Results and Analysismentioning
The high-temperature particles produced by air gouging processes are common pollutants in cleaning workshops, which could endanger workers’ health. In this research, a two-way coupled Eulerian-Lagrangian method based on discrete phase modelling (DPM) was used to investigate the transport characteristics of high-temperature particles generated from air gouging processes. The particle group in the movement was divided into core zone and boundary zone, and the kinetic mechanism of particles in different zones was analysed. The results show particles in the boundary zone are more susceptible to the vortex entrainment effect than particles in the core zone, and some particles could be moved from the vortex diffusion zone to the vortex recirculation zone. The smaller the particle size, the better the followability to the hot airflow. The slower the temperature decay of particles, the more significant the thermophoresis effect, which could enhance the diffusion behaviour of the small particles. By analysing the average residence time of particles in the breathing zone, the influence of different factors on the average vertical diffusion height [Formula: see text] of particles is summarized, and a nonlinear regression prediction model of [Formula: see text] is established. The results can contribute to health risk assessment and industrial ventilation design.
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