Numerical Modeling of Air Flow in a Cabinet Dryer Equipped by Deflector Plates

2019 ◽  
Vol 15 (10) ◽  
Author(s):  
Omid Reza Roustapour ◽  
Hamid Reza Gazor ◽  
Kazemi Farzin
Keyword(s):  
Fluid Dynamics ◽  
Numerical Modeling ◽  
Air Flow ◽  
Outlet Temperature ◽  
Governing Equations ◽  
Air Velocity ◽  
Drying Time ◽  
Elapsed Time ◽  
Quadrilateral Elements ◽  
Simulation Results

AbstractIn this study, air deflector plates were used in order to increase the air elapsed time in the chamber. The air flow pattern was simulated using computational fluid dynamics. The geometry of the chamber was produced in 2D and meshed by triangular and quadrilateral elements, boundary conditions were defined and the governing equations solved. Modeling of flow without any deflectors depicted the air flowed to the chamber conducted to the outlet without any distortion. Air vortices were generated when the deflectors defined in model. To evaluate the influence of deflectors on drying period, constructed plates installed in the dryer chamber and melon slices were dried when deflectors used or not. Simulation results showed magnitude of the air velocity was increased and temperature uniform distribution developed on the surface of trays. The outlet temperature was also decreased up to 10 % and drying time reduced to 22 % when the deflectors were employed.

scholarly journals Effects of cough-jet on airflow and contaminant transport in an airliner cabin section

2017 ◽  
Vol 10 (2) ◽  
pp. 72-82 ◽  
Author(s):  
Lin Yang ◽  
Xiangdong Li ◽  
Yihuan Yan ◽  
Jiyuan Tu
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Contaminant Transport ◽  
Air Flow ◽  
Numerical Results ◽  
Computational Domain ◽  
Short Period ◽  
Simulation Results ◽  
Precise Representation ◽  
Cabin Environment

The goals of this study were to investigate the effect of cough-jet on local airflow and contaminant transport in a typical cabin environment by using computational fluid dynamics. A fully occupied airliner cabin section was employed as the computational domain. Contaminants were released through coughing passengers from different locations inside the cabin. Numerical results in terms of contaminant transport characteristics were examined and compared. It can be concluded that cough-jet has significant effects on air flow in front of cough passenger in a short period of time. Also, it was found that, without considering the cough-jet model, the simulation results could not be a precise representation of the transport and distribution of cough-generated airborne contaminants.

scholarly journals Validation Study of Photovoltaic Thermal Nanofluid Based Coolant Using Computational Fluid Dynamics Approach

CFD letters ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 58-71
Author(s):  
Mohd Afzanizam Mohd Rosli ◽  
Yew Wai Loon ◽  
Muhammad Zaid Nawam ◽  
Suhaimi Misha ◽  
Aiman Roslizar ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Surface Temperature ◽  
Validation Study ◽  
Numerical Approach ◽  
Experimental Results ◽  
Thermal System ◽  
Outlet Temperature ◽  
Photovoltaic Thermal System ◽  
Simulation Results

In the study, the photovoltaic thermal system using nanofluid as coolant is validated using numerical approach by comparing the experimental results and simulation results. Due to high cost and difficulty in preparing nanofluid, it is more practical to perform the study using numerical approach which is convenient and saves plenty of time. The photovoltaic thermal system is investigated numerically through Computational Fluid Dynamics Approach using Ansys 19.0 Fluent Software. The numerical study is based on different solar irradiation at different hours. The coolant that is selected in the study is aluminum oxide () water nanofluid. The validation study between the experimental results and simulation results are achieved by examining the photovoltaic (PV) surface temperature and nanofluid outlet temperature. The maximum percentage of error between experimental and simulation results of PV surface temperature and nanofluid outlet temperature are 12.66% and 7.89%. Also, the mean average percentage error (MAPE) are computed for PV surface temperature and nanofluid outlet temperature. The results for PV surface temperature and nanofluid outlet temperature are 10.31% and 6.67%. Since the MAPE results are within 10% or error, it proved that there is good accuracy between the simulation and experimental results.

Effect of the Distance between Guided Needle and Cone Body on Properties of Vortex Spun Yarn

2014 ◽  
Vol 1048 ◽  
pp. 575-578
Author(s):  
Mei Ling Li ◽  
Chong Wen Yu ◽  
Shan Shan Shang
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Computational Fluid Dynamics ◽  
Pressure Distribution ◽  
Air Flow ◽  
Yarn Quality ◽  
Spun Yarn ◽  
Simulation Results ◽  
Dynamics Models

Effects of the distance between guided needle and cone body on properties of MVS yarns were investigated by numerical simulation. 5 groups of the distance are designed (0.5mm, 1mm, 1.5mm, 2mm and 2.5mm). The 3D computational fluid dynamics models are established to conduct the numerical simulation of the airflow in the nozzle. Through analysis of the characteristics of air flow inside the different nozzles, such as pressure distribution and velocity vectors, the motion of drafted fibers and performances of yarns are discussed. Simulation results show that when the distance is 1.5mm, the airflow state within the nozzle is beneficial to form more open-ends and twist, and the yarn quality would be better.

Exploring the Polymer Drawing of the Air Centrifugal Spinning

2020 ◽  
Vol 13 (3) ◽  
pp. 189-195
Author(s):  
Jia-Jia Liu ◽  
Ting Chen ◽  
Li-Li Wu
Keyword(s):  
Flow Field ◽  
Nozzle Exit ◽  
Field Model ◽  
Rotation Speed ◽  
Air Flow ◽  
Radius Vector ◽  
Air Velocity ◽  
Centrifugal Spinning ◽  
Simulation Results

Background and Objective: The air-flow field of the air centrifugal spinning is simulated and measured. The simulated air velocities coincide well with the measured ones, confirming the correctness of the air-flow field model. Methods: The polymer drawing in the air-flow field of the air centrifugal spinning is modeled and simulated. Effects of the rotation speed and initial air velocity on the diameter and radius vector of the threadline are investigated. Results: The air velocity is found to decrease with the increase of the distance away from the nozzle exit. Simulation results show that both larger rotation speed and higher initial air velocity can reduce the threadline diameter. Conclusion: The radius vector of the threadline increases rapidly with the increase of the initial air velocity, which is helpful to reduce the threadline diameter.

The Research on Influence of Different Forms of Window on Indoor Natural Ventilation in Residential Building

2013 ◽  
Vol 353-356 ◽  
pp. 3109-3113
Author(s):  
Xiao Ping Huo ◽  
Jia Yu Hu ◽  
Dan Li
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Temperature Field ◽  
Natural Ventilation ◽  
Residential Building ◽  
Measured Data ◽  
Air Velocity ◽  
Indoor Temperature ◽  
Simulation Results ◽  
Maximum Limit

The indoor temperature can be reduced by rationally using natural ventilation in summer. Based on the computational fluid dynamics software of AIRPAK, its convenient to simulate the air velocity field and temperature field of a house. Comparing software numerical simulation results with measured data, we conclude that under the maximum limit of window-wall ratio, the bigger the windows are, the greater the airflow effect is, the better the indoor ventilation effect is.

Two Phase Flow Modeling of the Interior Ballistics for a Naval Medium Caliber Gun with Guided Projectile

2013 ◽  
Vol 465-466 ◽  
pp. 531-535
Author(s):  
Hazem Elsadek ◽  
Xiao Bing Zhang ◽  
Mahmod M. Rashad ◽  
Cheng Cheny
Keyword(s):  
Fluid Dynamics ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Flow Modeling ◽  
Governing Equations ◽  
Ballistic Performance ◽  
Two Phase ◽  
Interior Ballistics ◽  
Simulation Results ◽  
Good Agreement

This paper discusses the two phase (gas/Particles) flow effect of interior ballistic performance in a 76 mm naval medium caliber gun with guided projectile, using granular seven-perforated propellant. The theoretical and numerical simulation of the two phase flow in the interior ballistic cycle is carried out by using MacCromack technique depending on the governing equations of the two phase flow. This simulation is considered to be helpful for the prediction of the interior ballistic parameters which are required for endurance of guided projectile. A good agreement between the simulation results compared to the experimental results is fulfilled. Keywords: Guided projectile, two phase flow modeling, Interior ballistic, Computational fluid dynamics.

scholarly journals Coupling Computational Fluid Dynamics Simulations and Statistical Moments for Designing Healthy Indoor Spaces

2019 ◽  
Vol 16 (5) ◽  
pp. 800 ◽  
Author(s):  
Shamia Hoque ◽  
Firoza Omar
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Air Flow ◽  
Particle Dispersion ◽  
Statistical Moments ◽  
Dispersion Pattern ◽  
Case Scenario ◽  
Worst Case ◽  
Site Specific ◽  
Indoor Spaces

Cross-contamination between occupants in an indoor space may occur due to transfer of infectious aerosols. Computational fluid dynamics (CFD) provides detailed insight into particle transport in indoor spaces. However, such simulations are site-specific. This study couples CFD with statistical moments and establishes a framework that transitions site-specific results to generating guidelines for designing “healthy” indoor spaces. Eighteen cases were simulated, and three parameters were assessed: inlet/outlet location, air changes per hour, and the presence/absence of desks. Aerosol release due to a simulated “sneeze” in a two-dimensional ventilated space was applied as a test case. Mean, standard deviation, and skewness of the velocity profiles and particle locations gave an overall picture of the spread and movement of the air flow in the domain. A parameter or configuration did not dominate the values, confirming the significance of considering the combined influence of multiple parameters for determining localized air-flow characteristics. Particle clustering occurred more when the inlet was positioned above the outlet. The particle dispersion pattern could be classified into two time zones: “near time”, <60 s, and “far time”, >120 s. Based on dosage, the 18 cases were classified into three groups ranging from worst case scenario to best case scenario.

Construction Ventilation Scheme Optimization of Underground Main Powerhouse Based on CFD

2013 ◽  
Vol 368-370 ◽  
pp. 619-623
Author(s):  
Zhen Liu ◽  
Xiao Ling Wang ◽  
Ai Li Zhang
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Flow Field ◽  
Air Flow ◽  
Scheme Optimization ◽  
Pressure Distributions ◽  
Air Volume ◽  
Computational Fluid Dynamics Cfd ◽  
Traditional Construction ◽  
Ventilation Scheme

For the purpose of avoiding the deficiency of the traditional construction ventilation, the ventilation of the underground main powerhouse is simulated by the computational fluid dynamics (CFD) to optimize ventilation parameters. A 3D unsteady RNG k-ε model is performed for construction ventilation in the underground main powerhouse. The air-flow field and CO diffusion in the main powerhouse are simulated and analyzed. The two construction ventilation schemes are modelled for the main powerhouse. The optimized ventilation scheme is obtained by comparing the air volume and pressure distributions of the different ventilation schemes.

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