Isentropic air flows at high stagnation pressures

1976 ◽  
Vol 9 (5) ◽  
pp. 827-831 ◽  
Author(s):  
L. M. Davydov ◽  
V. M. Zhiravov
Keyword(s):  
Air Flows

SPRAY BEHAVIOR IN NONSWIRUNG AND SWIRLING ANNULAR AIR FLOWS

1991 ◽  
Vol 1 (3) ◽  
pp. 319-336 ◽  
Author(s):  
Xianguo Li ◽  
R. S. Tankin
Keyword(s):  
Air Flows

Ozone Tagging Velocimetry for unseeded velocity measurements in air flows

1998 ◽  
Author(s):  
Robert Pita ◽  
Lubomir Ribarov ◽  
Joseph Wehrmeyer ◽  
Farrokh Batliwala ◽  
Peter DeBarber
Keyword(s):  
Velocity Measurements ◽  
Air Flows

scholarly journals Modeling of aerosol transmission of airborne pathogens in ICU rooms of COVID-19 patients with acute respiratory failure

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Cyril Crawford ◽  
Emmanuel Vanoli ◽  
Baptiste Decorde ◽  
Maxime Lancelot ◽  
Camille Duprat ◽  
...  
Keyword(s):  
Ventilation System ◽  
Medical Personnel ◽  
Airborne Particles ◽  
Proof Of Concept ◽  
Dynamics Model ◽  
Treatment Unit ◽  
Normal Breathing ◽  
Air Flows ◽  
Boltzmann Method ◽  
Number Of Particles

AbstractThe COVID-19 pandemic has generated many concerns about cross-contamination risks, particularly in hospital settings and Intensive Care Units (ICU). Virus-laden aerosols produced by infected patients can propagate throughout ventilated rooms and put medical personnel entering them at risk. Experimental results found with a schlieren optical method have shown that the air flows generated by a cough and normal breathing were modified by the oxygenation technique used, especially when using High Flow Nasal Canulae, increasing the shedding of potentially infectious airborne particles. This study also uses a 3D Computational Fluid Dynamics model based on a Lattice Boltzmann Method to simulate the air flows as well as the movement of numerous airborne particles produced by a patient’s cough within an ICU room under negative pressure. The effects of different mitigation scenarii on the amount of aerosols potentially containing SARS-CoV-2 that are extracted through the ventilation system are investigated. Numerical results indicate that adequate bed orientation and additional air treatment unit positioning can increase by 40% the number of particles extracted and decrease by 25% the amount of particles deposited on surfaces 45s after shedding. This approach could help lay the grounds for a more comprehensive way to tackle contamination risks in hospitals, as the model can be seen as a proof of concept and be adapted to any room configuration.

Comparison of computed and measured particle velocities and erosion in water and air flows

Wear ◽  
2007 ◽  
Vol 263 (1-6) ◽  
pp. 330-338 ◽  
Author(s):  
Y. Zhang ◽  
E.P. Reuterfors ◽  
B.S. McLaury ◽  
S.A. Shirazi ◽  
E.F. Rybicki
Keyword(s):  
Air Flows ◽  
Particle Velocities ◽  
Measured Particle

Ferrule-top cantilever optical fiber sensor for velocity measurements of low speed air flows

2011 ◽  
Author(s):  
A. Cipullo ◽  
G. Gruca ◽  
K. Heeck ◽  
F. De Filippis ◽  
D. Iannuzzi ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Fiber Sensor ◽  
Velocity Measurements ◽  
Low Speed ◽  
Air Flows

Study of Flow Field in Compact Spinning with Pneumatic Groove

2011 ◽  
Vol 332-334 ◽  
pp. 260-263
Author(s):  
Shi Rui Liu
Keyword(s):  
Flow Field ◽  
Negative Pressure ◽  
Static Pressure ◽  
Three Dimensional ◽  
Three Dimensional Flow ◽  
Dimensional Flow ◽  
Compact Zone ◽  
Air Flows ◽  
Compact Spinning

In the paper the structure of the compact spinning with pneumatic groove is introduced and the characteristics of three-dimensional flow field of the compact spinning with pneumatic groove are also investigated. Results from this research confirmed that In the compact zone, the air flows to the groove and enters the inner hollow of the slot-roller through the round holes, and the air on both sides of the groove condenses to the center of it and flows to the round holes; It is beneficial to compact the fiber and make the fiber slip to the bottom of the groove with shrink shape; the velocity and negative pressure are both not homogeneous, as the round holes are not continual, and the gradient of static pressure and velocity in compact zones are also perceptible.

Numerical simulation of air flows in the loading chute of an aspiration shelter with a multistage recirculating air seal

2021 ◽  
pp. 61-68
Author(s):  
A. B. Gol’tsov ◽  
K. I. Logachev ◽  
Yu. G. Ovsyannikov ◽  
V. M. Kireev
Keyword(s):  
Numerical Simulation ◽  
Air Flows

Рассмотрена многоступенчатая технологическая рециркуляция аспирационного воздуха в перегрузочные желоба ― возврат аспирируемого от укрытий технологического оборудования воздуха обратно в технологический процесс с целью снижения энергетических затрат за счет создания аэродинамического сопротивления на пути движения эжекционного воздуха и поддержания требуемых теплофизических параметров в оборудовании. Рекомендуется оснащать желоба одноступенчатыми рециркуляционными затворами с минимально возможным углом подачи воздуха навстречу потоку, эжектируемому перегружаемым сыпучим материалом, что повысит энергетическую эффективность систем вентиляции и сократит выбросы в атмосферу вредных веществ.

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