scholarly journals Numerical modeling of air flow inside the human nose cavity

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
A.K. Manapova ◽  
A.A. Issakhov
Keyword(s):  
Numerical Modeling ◽  
Air Flow ◽  
Human Nose

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 NUMERICAL MODELING OF AN ASCENDING AIR FLOW WITH PARTICLES OF BIOFUEL

2017 ◽  
Vol 39 (5) ◽  
pp. 84-90
Author(s):  
B. I. Basok ◽  
B. V. Davydenko ◽  
V. G. Novikov ◽  
S. M. Goncharuk
Keyword(s):  
Numerical Modeling ◽  
Air Flow

В работе представлены результаты численного моделирования восходящего течения воздуха с твердыми частицами биотоплива в канале с переменным сечением. Определены особенности движения частиц и их динамические характеристики в зависимости от скорости воздушного потока на входе в канал.

Mathematical and Numerical Modeling of the Suspension of Particles Due to the Air Flow Between Two Rigid Walls

2018 ◽  
Vol 9 (1) ◽  
pp. 50
Author(s):  
H. Benbih ◽  
Kamal Gueraoui ◽  
H. Bensalah ◽  
A. Rtibi ◽  
Y. Belkasmi ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Air Flow ◽  
Rigid Walls ◽  
Mathematical And Numerical Modeling

Analysis of air flow patterns in the human nose

1993 ◽  
Vol 31 (6) ◽  
pp. 585-592 ◽  
Author(s):  
D. Elad ◽  
R. Liebenthal ◽  
B. L. Wenig ◽  
S. Einav
Keyword(s):  
Air Flow ◽  
Flow Patterns ◽  
Human Nose

scholarly journals Exhaled air speed measurements of respiratory air flow, generated by ten different human subjects, under uncontrolled conditions

2019 ◽  
Vol 111 ◽  
pp. 02074 ◽  
Author(s):  
Martin Ivanov
Keyword(s):  
Human Subjects ◽  
Air Flow ◽  
Flow Characteristics ◽  
Respiratory Cycle ◽  
Numerical Studies ◽  
Exponential Trend ◽  
Measured Speed ◽  
Air Speed ◽  
The One ◽  
Human Nose

The presented study reveals a multi-point experimental measurement of the airflow speed, generated in the exhalation phase from the human respiratory cycle, based on data from 10 real human subjects. The results obtained demonstrate the exceptional irregularity and the transient character of the human respiratory cycle, in terms of measured speed at different points of man-generated exhalation air flow. The presented exponential trend lines show as expected, that there is a reduction in the exhalation speed, with the increase of the distance from the nose. The summary analysis shows that at 10 cm distance from the nose the maximum as well as the average measured speeds are higher than the one, measured at 5 cm distance. This suggests that due to the physiology of the human nose, 5 cm distance is not enough to characterize the fully developed exhalation jet flow. It is suggested that at this distance the exhalation jets are still two, issuing from each nostril, with different flowrate ratio. The obtained flow characteristics can be used to compare, validate and verify data from conducted numerical studies of the breathing process, via virtual models or real breathing thermal mannikins.

Wind-Induced Air-Flow Patterns in an Urban Setting: Observations and Numerical Modeling

2018 ◽  
Vol 175 (8) ◽  
pp. 3051-3068 ◽  
Author(s):  
Ahmed M. A. Sattar ◽  
Mohamed Elhakeem ◽  
Bishoy N. Gerges ◽  
Bahram Gharabaghi ◽  
Ismail Gultepe
Keyword(s):  
Numerical Modeling ◽  
Air Flow ◽  
Flow Patterns ◽  
Urban Setting

scholarly journals Study of the optimal placement of exhaust ventilation equipment in a poultry house using numerical simulation

2020 ◽  
pp. 89-101
Author(s):  
V. Trokhaniak ◽  
Keyword(s):  
Mass Transfer ◽  
Numerical Modeling ◽  
Heat And Mass Transfer ◽  
Egg Production ◽  
Air Flow ◽  
Ventilation System ◽  
Optimal Placement ◽  
Feed Consumption ◽  
Poultry House ◽  
Exhaust Ventilation

Keeping poultry in damp and cold rooms with poor ventilation system reduces the weight gain of the bird, reduces its egg production and increases the incidence of young animals, as well as excessive feed consumption and exceeding the growing period established by technical regulations. The aim of the study was to determine the effective placement of exhaust ventilation equipment at the height of the end wall of the poultry house to improve the ventilation system, reduce stagnant air zones and improve the microclimate. The numerical modeling of hydrodynamics, heat and mass transfer processes during air ventilation in poultry buildings is carried out. The analysis of the conditions of heat and mass transfer in the poultry house, depending on the placement of fans along the height of the house, and the efficiency of the location of such equipment was determined. The system for maintaining the microclimate in poultry houses was considered in the presence of a system for cooling the outside air with water from an underground well. The ventilation system uses exhaust ventilation equipment with a fan wheel diameter of 1.25 m. In the simulation, the fans were installed at a height of 1.125, 1.5 and 1.875 m from the floor to the center of the fan axis. Simulation was performed for 2D CFD models using ANSYS Fluent software. The results of CFD analysis of the air flow pattern and the thermal state inside the house are presented. As a result of numerous studies, the geometry of the location of the ventilation equipment has been found. It is shown that it is advisable to install ventilation equipment at a height of 1.5 m. At the same time, the size of stagnant zones and the uneven distribution of air velocity near the bird are reduced. Numerical modeling was carried out in order to minimize the size of stagnant zones, equalize the air flow and improve the temperature indicators in the poultry house.

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