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Journal articles on the topic 'Airflow'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Jing, Jiajun, Dong-Seok Lee, Jaewan Joe, Eui-Jong Kim, Young-Hum Cho, and Jae-Hun Jo. "A Visualized Method of Airflow between Adjacent Zones inside a Multizone Building Based on Pressure Difference Frequency: Airflow Mapping." Indoor Air 2023 (July 3, 2023): 1–19. http://dx.doi.org/10.1155/2023/5433093.

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The airflow movement inside a multizone building has a significant impact on pollutant transfer, thermal comfort, and indoor air quality. However, there are difficulties in visualizing the airflow movement with existing methods. This study proposes a visualization method for evaluating airflows between adjacent internal zones inside a multizone building based on the analysis of pressure difference frequency. After the distribution of absolute pressure is measured and the wind pressures on the surfaces of the building are calculated, the variation of pressure differences between each couple of

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Shirozu, Kazuhiro, Tetsuya Kai, Hidekazu Setoguchi, Nobuyasu Ayagaki, and Sumio Hoka. "Effects of Forced Air Warming on Airflow around the Operating Table." Anesthesiology 128, no. 1 (2018): 79–84. http://dx.doi.org/10.1097/aln.0000000000001929.

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Abstract Background Forced air warming systems are used to maintain body temperature during surgery. Benefits of forced air warming have been established, but the possibility that it may disturb the operating room environment and contribute to surgical site contamination is debated. The direction and speed of forced air warming airflow and the influence of laminar airflow in the operating room have not been reported. Methods In one institutional operating room, we examined changes in airflow speed and direction from a lower-body forced air warming device with sterile drapes mimicking abdominal

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Wang, Ping, Kai Gu, Jinyi Hou, and Bingjie Dou. "An Automatic Recognition Method for Airflow Field Structures of Convective Systems Based on Single Doppler Radar Data." Atmosphere 11, no. 2 (2020): 142. http://dx.doi.org/10.3390/atmos11020142.

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Airflow structures within convective systems are important predictors of damaging convective disasters. To automatically recognize different kinds of airflow structures (the convergence, divergence, cyclonic rotation, and anticyclonic rotation) within convective systems, an airflow structure recognition method is proposed, in this paper, based on a regular hexagonal template. On the basis of single Doppler radar data, the template is designed according to the appearance model of airflows in radial velocity maps. The proposed method is able to output types and intensities of airflow structures

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Lestinen, Sami, Mark Wesseling, Risto Kosonen, Hannu Koskela, and Dirk Müller. "Airflow characteristics under planar opposed ventilation jets in a controlled indoor environment." E3S Web of Conferences 111 (2019): 01029. http://dx.doi.org/10.1051/e3sconf/201911101029.

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Healthy, comfortable and intelligent indoor environment is a key objective in comprehensive well-being. This is also a main target of advanced HVAC-technology. In indoor environments, air distribution plays a major role while providing clean air to occupants. Therefore, investigating ventilation jets is an essential matter. In this study, the main objective was to improve knowledge on numerical modeling and airflow characteristics. In addition, the reliability of modeling methods were investigated. The experiments were carried out in a test room by using omnidirectional anemometers. The planar

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De Vogeleer, Gerlinde, Peter Demeyer, Philippe Van Overbeke, and Jan G. Pieters. "Assessing Airflow Distribution in Vents of a Naturally Ventilated Test Facility Using Reference Air Velocity Measurements." Transactions of the ASABE 61, no. 3 (2018): 1065–76. http://dx.doi.org/10.13031/trans.12458.

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Abstract. Emission measurement in naturally ventilated buildings is a complex task because wind conditions can change quickly, inducing high spatial and temporal variations in the air velocity and pollutant concentration at the vent level. Simply taking the product of differential pollutant concentration and airflow rate may generate inaccurate results because the limited number of measurement locations usually fails to correctly reflect the velocity and concentration distributions in the vents. To assess the predictability of the airflow distribution in the vents of a naturally ventilated bui

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Jia, Tong, Heng Ma, and Ke Gao. "Decision on optimal airflow regulation solution set based on heat and airflow coupling characteristics of mine airflow in time series." PLOS One 20, no. 5 (2025): e0320326. https://doi.org/10.1371/journal.pone.0320326.

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Addressing the issue where traditional airflow regulation models, which treat natural ventilation pressure and ventilation resistance as constant values, fail to determine the optimal solution set for airflow regulation based on real-time dynamic mine environments, this research proposes a model based on the characteristics of airflow’s aerodynamic coupling with heat flow in an actual mine. A density-pressure-temperature characteristic equation is introduced to describe the variation laws of airflow state properties, forming a transient heat and airflow flow characteristics model in time serie

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Yamamoto, Toshiaki, Robert Donovan, and David Ensor. "Model Study for Optimization of Cleanroom Airflows." Journal of the IEST 31, no. 6 (1988): 24–29. http://dx.doi.org/10.17764/jiet.1.31.6.et0013l4g2678g46.

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A menu-driven numerical simulation was developed to model the airflow in a typical industrial process cleanroom. The effects of changing entry velocity, isolating curtain height, and return airflow are evaluated. Theoretical guidelines for minimizing the strength of recirculation zones and optimizing the airflows in the cleanroom are discussed. These simulations help identify cleanroom designs that minimize the transport of particle contamination.

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8

Liu, Mingsheng. "Variable Speed Drive Volumetric Tracking for Airflow Control in Variable Air Volume Systems." Journal of Solar Energy Engineering 125, no. 3 (2003): 318–23. http://dx.doi.org/10.1115/1.1559168.

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An airflow control method has been developed for variable air volume (VAV) systems. This airflow control method is termed VSD volumetric tracking (VSDVT) since both the supply and return airflows are determined using signals of variable speed drives (VSD) instead of flow stations. Its performance is studied and compared with the fan tracking (FT) method using model simulations. For the simulation considered, the VSDVT maintains a constant building pressure and the required outside airflow under all load conditions, and reduces the annual supply and return air fan energy significantly. This pap

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9

Bulińska, Anna, and Zbigniew Buliński. "Determination of the Interzonal Airflows in Naturally Ventilated Dwellings Based on Concentration Measurements of the Metabolic Carbon Dioxide." Energies 16, no. 1 (2022): 95. http://dx.doi.org/10.3390/en16010095.

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The role of interzonal airflows is especially pronounced in naturally ventilated buildings. In such buildings, reversed airflows in the ventilation stacks might occur as well. This affects the air exchange rate and contaminant distribution in buildings. A significant increase in carbon dioxide concentration is a characteristic phenomenon for poorly ventilated rooms. This paper demonstrates the application of metabolic carbon dioxide concentration measurements for interzonal airflow estimation in naturally ventilated buildings. The presented method is based on the continuous measurements of CO2

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Ståhl, Magnus, and Jonas Berghel. "Impact of cooling air temperature and airflow on wood fuel pellet durability, hardness, and off-gassing during industrial storage." BioResources 20, no. 2 (2025): 3286–98. https://doi.org/10.15376/biores.20.2.3286-3298.

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The cooling of pellets is necessary because pellets reach 70 to 90 °C after the pellet press. The reduction in temperature solidifies the pellets, which increases the pellet quality and reduces the risk of self-heating during storage. Industrially, pellet plants use outdoor air in counterflow coolers and cooling ends when the pellet temperature is approximately 5 °C above ambient temperature. Cooling performed in the summer could result in high temperatures in the pellet stacks during storage, and cooling at low temperatures and high airflows in the winter could cause quality problems. Therefo

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Cao, Yingxue, Keke Li, Yi Wang, et al. "The Influence of the Outdoor Atmospheric Environment on the Airflow Pattern in a Multi-Layer Plant with Vertically Connected Space and Heat Sources." Buildings 15, no. 10 (2025): 1739. https://doi.org/10.3390/buildings15101739.

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The airflow within industrial buildings under natural ventilation is influenced by both internal conditions and external environments. Multi-layer vertically connected plants include a vertically connected space and multiple heat sources distributed on different floors. Due to its complex internal conditions, airflow patterns under natural ventilation in this type of plant are not clear. In this work, we numerically investigate the influence of outdoor wind and thermal pressure on the airflow patterns within this type of plant. The findings indicate that with no outdoor thermal and wind pressu

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Wang, Yuanchen, Christian Lodroner, Michael Müller, and Konstantinos Stergiaropoulos. "Monitoring of Indoor Airflows with a New Two-Dimensional Airflow Sensor." E3S Web of Conferences 111 (2019): 05005. http://dx.doi.org/10.1051/e3sconf/201911105005.

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Although airflow is invisible, it has a big influence on the indoor environment. An incorrectly planned HVAC systems can lead to draught and thermal discomfort in occupied zones. Since the commissioning tests required after the installation of HVAC systems are generally performed without occupancy, the tests results do not always accurately represent the airflow that occurs during ordinary usage. The airflow needs to be continuously monitored and controlled by an intelligent HVAC system. The aim of this study is to develop a new two-dimensional airflow sensor for the monitoring of indoor airfl

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Lei, Yao, and Mingxin Cheng. "Aerodynamic Performance of Hex-Rotor UAV Considering the Horizontal Airflow." Applied Sciences 9, no. 22 (2019): 4797. http://dx.doi.org/10.3390/app9224797.

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In this paper, the aerodynamic performance of a Hex-rotor unmanned aerial vehicle (UAV) with different rotational speeds (1500–2300 RPM) considering the horizontal airflow conditions is analyzed by both simulations and experiments. A low-speed wind tunnel experiments platform is applied to measure the thrust, torque, and power consumption of a Hex-rotor UAV with different rotational speeds in horizontal airflow, which varied from 0 m/s–4 m/s. First, this paper introduces the effect of horizontal airflow on a UAV. Then, the low-speed wind tunnel experiments were carried out on a Hex-rotor UAV (

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Zhao, Wanying, Christopher Choi, Dapeng Li, Geqi Yan, Hao Li, and Zhengxiang Shi. "Effects of Airspeed on the Respiratory Rate, Rectal Temperature, and Immunity Parameters of Dairy Calves Housed Individually in an Axial-Fan-Ventilated Barn." Animals 11, no. 2 (2021): 354. http://dx.doi.org/10.3390/ani11020354.

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At many modern dairy farms, calves raised in barns are kept in individual stalls separated by solid partitions, which act as barriers. Ventilation fans blowing air perpendicular to these stalls only provide the optimal airflow to the first few calves, while those further away receive a slower airflow. To ascertain whatever effects different airflow speeds may have on the health of animals kept in stalls located at increasing distances from ventilation fans, we divided a select group of 43 Holstein dairy calves into six subgroups based on age, and each subgroup was subjected to either a specifi

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15

Fu, Xiu Zhang, and Jian Dong. "Numerical Analysis on the Impact of Windows and Interior Doors on Indoor Airflow of Rural Residence." Applied Mechanics and Materials 548-549 (April 2014): 1683–88. http://dx.doi.org/10.4028/www.scientific.net/amm.548-549.1683.

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There are several factors impacting on the indoor airflows, such as building openings, ambient wind speed, occupants’ behavior and so forth. This paper concentrates on the impact of windows and interior doors on airflows in a rural multi-storey residential building. The indoor airflow simulation was carried out by using the CFD software. 3 states of interior doors were set, and 60 regions were arrayed in bedroom to observe the variation of airflows. According to data of regions, the uniformity of airflow and the thermal comfort were analyzed. Simulation results identified that closing interior

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Zhu, Jialiang, Lihui Wang, Zhiling Li, Jianan Ma, Changjiang Ma, and Xinwei Yang. "Simulation study on the dynamic velocity field of the supplying jet coupled with the platform piston wind in non-screen door subway stations." E3S Web of Conferences 356 (2022): 02037. http://dx.doi.org/10.1051/e3sconf/202235602037.

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The coupling airflows of platform piston wind and station air-conditioning supply air is the most typical airflow organization of non-screen door subway station platform. By establishing a CFD software model of the coupling process between piston wind and air-conditioning supply air in subway station platform, the velocity field of the coupled airflow in the platform under different vehicle conditions is numerically simulated. It has been found that: when the train enters the station, the maximal piston wind velocity can reach 8 m/s with the air-conditioning supply air near the approach end si

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VENCKUS, Žilvinas, Albertas VENSLOVAS, and Mantas PRANSKEVIČIUS. "EXPERIMENTAL RESEARCH INTO AERODYNAMIC PARAMETERS OF A CYLINDRICAL ONE-LEVEL 8-CHANNEL CYCLONE." JOURNAL OF ENVIRONMENTAL ENGINEERING AND LANDSCAPE MANAGEMENT 22, no. 4 (2014): 284–91. http://dx.doi.org/10.3846/16486897.2014.973415.

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The Environmental Protection Laboratory of Vilnius Gediminas Technical University has developed and installed a one-level 8-channel cyclone with different internal structure, which is used for separation of particulate matter from air streams. Airflow velocity was measured in five points of each channel: at the end and the beginning of the channel, in the middle of the channel and in points arranged at 45° angle from the channel's end and beginning. The highest airflow velocity determined in 8-channel device by regulating volumes of peripheral and transit airflows with curvilinear semi-rings w

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Güldiken Sarıkaya, İpek Necla, Alperen Tekin, Fatih Suda, Zeynep Gülen Çukurova Yilmaz, and Mutlu Özcan. "Modelling Intra-Sinus Fluid Movements and Drainage Through Computational Fluid Dynamics Before and After Maxillary Sinus Augmentation: A Simulation-Based Pilot Study." Journal of Clinical Medicine 14, no. 1 (2024): 60. https://doi.org/10.3390/jcm14010060.

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Objectives: Sinus lifting, a procedure to augment bone in the maxilla, may cause complications such as sinusitis due to impaired drainage. This study aimed to assess how sinus lifting impacts airflow in the sinus cavity, which is essential for patients undergoing dental implants. Using computational fluid dynamics (CFD), this research analyzed airflow changes after sinus floor elevation, offering insights into the aerodynamic consequences of the procedure. Methods: Digital modeling and CFD analysis were performed using patient cone-beam computed tomography data. Three different sinus elevation

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Chen, Jinyan, Van-Thai Tran, Hejun Du, Junshan Wang, and Chao Chen. "A Direct-Writing Approach for Fabrication of CNT/Paper-Based Piezoresistive Pressure Sensors for Airflow Sensing." Micromachines 12, no. 5 (2021): 504. http://dx.doi.org/10.3390/mi12050504.

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Airflow sensor is a crucial component for monitoring environmental airflow conditions in many engineering fields, especially in the field of aerospace engineering. However, conventional airflow sensors have been suffering from issues such as complexity and bulk in structures, high cost in fabrication and maintenance, and low stability and durability. In this work, we developed a facile direct-writing method for fabricating a low-cost piezoresistive element aiming at high-performance airflow sensing, in which a commercial pen was utilized to drop solutions of single-walled carbon nanotubes onto

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Kravchenko, Ilia, Risto Kosonen, and Simo Kilpeläinen. "Performance Analysis of the Demand-Based Ventilation in a Nordic Apartment Building." Applied Sciences 11, no. 1 (2020): 176. http://dx.doi.org/10.3390/app11010176.

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In general, new Finnish apartment buildings are equipped with mechanical balanced demand-based ventilation. The airflow rate in the kitchen hood is boosted on demand to improve pollutant extraction during cooking. However, in practice, it has been found that the system does not work as desired. The focus of the paper was to present the simulation results from a case building equipped with a ventilation system that is commonly used in Finland. In the analysis, the airflow rates are calculated for the room, apartment, and air handling unit (AHU) levels for various ventilation mode scenarios. A s

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Kelemenová, Tatiana. "AIRFLOW MEASUREMENT TEST DEVICE FOR AIRFLOW SENSORS." Acta Mechatronica 4, no. 4 (2019): 17–21. http://dx.doi.org/10.22306/am.v4i4.52.

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Basset, Patricia, Angélique Amelot, Jacqueline Vaissière, and Bernard Roubeau. "Nasal airflow in French spontaneous speech." Journal of the International Phonetic Association 31, no. 1 (2001): 87–99. http://dx.doi.org/10.1017/s0025100301001074.

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The goal of this paper is to compare the degree of anticipatory and carryover phenomena in the behaviour of the velum during the production of French spontaneous speech, and to compare the data with the same speech material, but read. Airflows through the nose and the mouth were taken as an indirect indication of the velum behaviour. French is a language of special interest because there is a phonological contrast between oral and nasal vowels. The results show a tendency for nasal airflow to start before the nasal and a strong propensity to spread after the nasal. No differences could be esta

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Soriano, Noelle Cielito, Kevin A. Janni, Baitong Chen, Melissa Wilson, and Erin L. Cortus. "A Multi-Airspace Model to Investigate Airflow Patterns and Carbon Dioxide Emission Sources in Deep-pit Beef Cattle Finishing Facilities." Journal of the ASABE 67, no. 5 (2024): 1295–308. http://dx.doi.org/10.13031/ja.15956.

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HighlightsA multi-control volume mass balance approach tested with data from cattle finishing barns.Airflow estimates were highest in the barn airspace, compared to the animal-occupied zone and manure pit headspace.Slurry CO2 emission calculations were sensitive to gas concentration differences between zones and animal numbers.Abstract. An increasing number of cattle finishing barns in the Midwest are naturally ventilated (NV) with slatted floors over deep-pit manure storages. However, there is limited gas emission data currently available for this type of cattle housing and manure storage. Em

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Xing, Xiao, and Guo Ming Ye. "Numerical Simulation of Yarn Untwisting Mechanism in a Pneumatic Splicer Process." Applied Mechanics and Materials 229-231 (November 2012): 1721–24. http://dx.doi.org/10.4028/www.scientific.net/amm.229-231.1721.

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For better study of the airflow movement in the untwisting chamber of a pneumatic splicer, this paper uses a commercial computational fluid dynamics software FLUENT to realize the three dimensional numerical simulation for the characteristic of the airflows in the untwisting chamber. A three-dimensional grid and the realizable k- ε tur¬bulence model are used in this simulation. The characteristics of the air flows in different parts of the chamber are analysed according to the computed result. The airflow in the untwisting chamber can be divided into three regions in longitudinal section and t

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Yu, Fengjiao, Hongbing Chen, Wenqian Wang, and Jingjing An. "Optimization Strategies for Underfloor Air Distribution in a Small-Scale Data Center." Buildings 15, no. 3 (2025): 428. https://doi.org/10.3390/buildings15030428.

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Abstract: The development of 5G application technology has led to a rapid expansion in the scale of internet data center rooms and the number of servers. Due to the high heat generation of data center server equipment and the mixing of hot and cold airflows within the rooms, the thermal environment of these rooms fails to meet operational requirements with increasing energy consumption and thermal density. This study utilized the 6SigmaDC software to simulate and analyze the characteristics and existing problems of airflow distribution in a small-scale data center. Based on identified issues w

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Brownlie, Len, Collin Bailey, Jorge Carbo, et al. "Measurement and Visualization of Airflow through Sports Textiles." Proceedings 49, no. 1 (2020): 21. http://dx.doi.org/10.3390/proceedings2020049021.

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In marathon running, maintenance of body temperature is critical for peak performance. Race apparel should maximize ventilation yet current fabric permeability standards are based on airflow rates that are not generated during running. A novel flow measurement device was used to measure airflow through textiles and the effects of fabric hole size, coverage area and standoff distance between a simulated torso and fabric at velocities of 3.3, 5.3 and 10 m.s−1. Fluorescent dye injection in a tow tank or flume permitted visualization of flow through fabrics. Ventilation is constrained by the low f

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Doyle, Lex William, Louis Irving, Anjali Haikerwal, Katherine Lee, Sarath Ranganathan, and Jeanie Cheong. "Airway obstruction in young adults born extremely preterm or extremely low birth weight in the postsurfactant era." Thorax 74, no. 12 (2019): 1147–53. http://dx.doi.org/10.1136/thoraxjnl-2019-213757.

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BackgroundIt is unknown if adults born <28 weeks or <1000 g since surfactant has been available are reaching their full airway growth potential.ObjectiveTo compare expiratory airflow at 25 years and from 8 to 25 years of participants born <28 weeks or <1000 g with controls, and within the preterm group to compare those who had bronchopulmonary dysplasia with those who did not.MethodsAll survivors born <28 weeks or <1000 g in 1991–1992 in Victoria, Australia, were eligible. Controls were born contemporaneously, weighing >2499 g. At 8, 18 and 25 years, expiratory airflows we

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Osabutey, Augustina, Brady Cromer, Alexander Davids, et al. "Distribution of Airflow and Media Moisture Content across Two Vertical Bed Biofilters." AgriEngineering 4, no. 1 (2022): 179–89. http://dx.doi.org/10.3390/agriengineering4010013.

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For its small square footage, a vertical bed biofilter was developed for odor emission mitigation for livestock facilities with limited area available for biofilter installation. However, a concern about the design is that airflow and moisture may be poorly distributed across the biofilter due to the effects of gravity. Relevant data are sporadic in the literature. To fill the knowledge gap, two vertical bed biofilters were constructed at a university swine facility and monitored for two months. The monitoring was taken at 27 grid points on each biofilter per field visit. Results revealed that

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Wang, Junshi, Simon Mendez, Haibo Dong, and Howard A. Stone. "Links between language, fluid dynamics, and the airflows that transport pathogens." Journal of the Acoustical Society of America 152, no. 4 (2022): A287—A288. http://dx.doi.org/10.1121/10.0016300.

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Growing evidence shows that the airflows that accompany speech during social interactions contribute to the transport of pathogens, such as the SARS-CoV-2 virus. However, it is still elusive how the manners of articulation during speaking, such as time-varying airflow rate, and instantaneous teeth and lip movements, may affect the transport features of airflow exiting the mouth. We combine experimental and numerical approaches to investigate the flow patterns produced by representative vowels, such as /a/, /o/, and /i/, and consonants, such as /p/, /k/, /s/, and /h/, that have distinct articul

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Han, Wenqi, Yaqing Peng, Xunmei Wu, and Mengtao Han. "Spatiotemporal distribution prediction of coughing airflow at mouth based on machine learning—Part II: Boundary inference using neural network." E3S Web of Conferences 396 (2023): 01009. http://dx.doi.org/10.1051/e3sconf/202339601009.

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In the post-epidemic era, the trajectory of pathogenic airflows and droplets generated by coughing have been widely studied. However, owing to the limitations of measurement methods, there is a lack of detailed data on their spatiotemporal distribution at the mouth during coughing, which are the basis of research and the critical boundary conditions for computational simulation. Previous experiments have determined the velocity distribution of coughing airflow in spaces located far from the mouth. This study aims to collect detailed data at the mouth for use as the Computational Fluid Dynamics

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Pan, Jin, and Feng Jin. "Design and performance analysis of a discontinuous spiral baffle heat exchanger." Journal of Physics: Conference Series 2709, no. 1 (2024): 012006. http://dx.doi.org/10.1088/1742-6596/2709/1/012006.

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Abstract In this paper, a new type of heat exchanger with discontinuous spiral baffles is designed, and its performance on heat transfer is analyzed by numerical simulation. The research results show that the airflow in shell-side flows by a similar helical way, “Flow dead zone” is not found. The high enthalpy airflow’s temperature decreases about 38% of the inlet air temperature by cooling down with a convective heat transfer coefficient of 344.4 W/(m2·K), while the decrease of the airflow pressure is 30%.

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Lampret, Žiga, Gorazd Krese, and Matjaž Prek. "Enhancing cooling performance via airflow temperature fluctuations." E3S Web of Conferences 111 (2019): 02072. http://dx.doi.org/10.1051/e3sconf/201911102072.

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In ventilated and air-conditioned indoor environment, air movement substantially impacts thermal sensation and comfort of occupants from the point of view of whole body and local thermal sensation. Skin temperature and its rate of change are important factors for thermal sensation. Both are affected by the airflow velocity and temperature changes around the body which causes skin temperature fluctuations and changes in convective heat transfer. In this study the impact of temperature fluctuations in airflow on human thermal sensation was examined. For the purposes of the study, an air handling

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Ferdyn-Grygierek, Joanna, Andrzej Baranowski, Monika Blaszczok, and Jan Kaczmarczyk. "Thermal Diagnostics of Natural Ventilation in Buildings: An Integrated Approach." Energies 12, no. 23 (2019): 4556. http://dx.doi.org/10.3390/en12234556.

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Diagnostics of natural ventilation in buildings is problematic, as the airflow rate changes considerably over time. One constant average airflow is usually assumed when calculating energy demand for a building, however, such a simplification could be fraught with considerable error. The paper describes a comprehensive methodology for the diagnostics of a natural ventilation system in a building and its practical application. Based on in situ measurements and simulations in two existing buildings (dwelling house and school) in Poland, the real values of the ventilating airflows were analyzed an

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Przydrozny, Edward, and Aleksandra Przydrozna. "Temperature and airflow setting in dual-duct ventilation systems." E3S Web of Conferences 116 (2019): 00063. http://dx.doi.org/10.1051/e3sconf/201911600063.

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Past experiences of excess energy consumption and malfunctioning controls introduced prejudice when considering dual-duct ventilation systems during design stages. Modern technologies, however, can be used to improve performance and control of dual-duct systems, thus making these a sensible and safe design option. In the paper, we discuss challenges associated with setting the warm and cold supply air temperatures and how these set-points affect the airflows. We present limitations in temperature settings, due to instantaneous room thermal conditions and the individual design temperature requi

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Yamamoto, Toshiaki, Andrew Viner, Robert Donovan, and David Ensor. "Model Study of Contaminant Flow in the Vicinity of Semiconductor Processing Equipment." Journal of the IEST 33, no. 4 (1990): 25–31. http://dx.doi.org/10.17764/jiet.2.33.4.g31703341581611q.

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A continuous particle monitoring system was set up to. identify short-term particle bursts that reflect equipment operation and personnel activity within the photolithography bay of a cleanroom. The frequency and magnitude of the bursts vary with location and strongly depend on airflow, especially departures from vertical laminar flow introduced by equipment placement and/or human traffic. For example, the particle concentration above a stepper electronics cabinet was significantly reduced by moving the cabinet away from the cleanroom wall. Also, the particle concentration above the photoresis

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Deng, Tian, Wei Chen, Xing-ming Ren, Shuai Jiang, and Chao-hua Yuan. "Experiment on the Breakup of Liquid Jets in Different Cross-Airflows." International Journal of Aerospace Engineering 2019 (July 1, 2019): 1–13. http://dx.doi.org/10.1155/2019/2576568.

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The experiment is conducted with a high-speed camera to investigate the breakup processes of liquid jets in uniform, shear-laden, and swirling cross-airflows. The liquid used in the test is water, the nozzle diameter is 2 mm, and the liquid-to-air momentum flux ratio q ranges from 5 to 3408.5. The results indicate that liquid jets break up to form small droplets in the uniform cross-airflow. There is an exponential relation between the broken position and q. In the shear-laden cross-airflow, the penetration depth of the jet is similar to that of the uniform case, both of which increase with th

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Mahmud, Md Sultan, Azlan Zahid, Long He, et al. "Development of an Automatic Airflow Control System for Precision Sprayers Based on Tree Canopy Density." Journal of the ASABE 65, no. 6 (2022): 1225–40. http://dx.doi.org/10.13031/ja.14972.

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HighlightsA LiDAR-guided automatic airflow control system for precision sprayers was developed.Three models were built to measure the amount of airflow required for apple trees.The study confirmed that adjusting the fan inlet could control airflow penetration into tree canopies.Results suggest that the system can reduce spray drift and off-target losses. Abstract. The airflow discharged from orchard airblast sprayers is a primary component for successfully carrying spray droplets to the target trees. Because of the variation in orchard tree canopies, control of the airflow to minimize off-targ

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Alsved, M., A. Civilis, P. Ekolind, et al. "Temperature-controlled airflow ventilation in operating rooms compared with laminar airflow and turbulent mixed airflow." Journal of Hospital Infection 98, no. 2 (2018): 181–90. http://dx.doi.org/10.1016/j.jhin.2017.10.013.

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Lee, Linda D., Matthew Berkheiser, Ying Jiang, et al. "Risk of Bioaerosol Contamination With Aspergillus Species Before and After Cleaning in Rooms Filtered With High-Efficiency Particulate Air Filters That House Patients With Hematologic Malignancy." Infection Control & Hospital Epidemiology 28, no. 9 (2007): 1066–70. http://dx.doi.org/10.1086/519866.

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Objective.To examine the impact of cleaning and directional airflow on environmental contamination with Aspergillus species in hospital rooms filtered with high-efficiency particulate air (HEPA) filters that house patients with hematologic malignancy.Design.Detailed environmental assessment.Setting.A 475-bed tertiary cancer center in the southern United States.Methods.From April to October 2004, 1,258 surface samples and 627 bioaerosol samples were obtained from 74 HEPA-filtered rooms (in addition, 88 outdoor bioaerosol samples were obtained). Samples were collected from rooms cleaned within 1

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Leopold, Donald A. "Perception of Airflow Is More Important Than Actual Airflow." Archives of Otolaryngology–Head & Neck Surgery 132, no. 6 (2006): 597. http://dx.doi.org/10.1001/archotol.132.6.597.

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Zeng, Jie, Zhi Yan Hou, and Hao Zeng Jiang. "The Numerical Simulation of Swirling Airflow Field for Different Swirling Airflow Head in Swirling Airflow Finishing." Applied Mechanics and Materials 678 (October 2014): 582–86. http://dx.doi.org/10.4028/www.scientific.net/amm.678.582.

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The key of swirling airflow finishing is how to generate the swirling airflow. In the paper, three swirling airflow head are discussed according the manners of tangential inflow. By means of FLUENT, the general software of CFD, the swirling airflow field from different airflow head is simulated. The simulation results are shown by the flow line graphs, tangential velocity, radial distribution graphs, etc. All we have studied is as the basis for the determination of the application scope of each swirling airflow head.

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Latif, Haider, Samira Rahnama, Alessandro Maccarini, Goran Hultmark, Peter V. Nielsen, and Alireza Afshari. "Precision Ventilation in an Open-Plan Office: A New Application of Active Chilled Beam (ACB) with a JetCone Feature." Sustainability 14, no. 7 (2022): 4242. http://dx.doi.org/10.3390/su14074242.

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Mixing ventilation systems effectively improves thermal comfort in open-spaces due to adequate turbulent mixing of the cold stream with ambient air. This study introduces the concept of precision ventilation for achieving local thermal comfort in a mixing ventilation system. This precision ventilation system provides asymmetrical airflows from an active chilled beam (ACB) to each of the office occupants. These ACBs provide air velocities with different magnitudes and directions. To achieve different magnitudes and directions, JetCones are used to vary the airflow in different parts of the ACB.

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Li, Jiaying, Wei You, and Wowo Ding. "The potential of the height-to-width ratio as an indicator to characterize the ventilation performance of a canyon in the urban context." Journal of Physics: Conference Series 2600, no. 10 (2023): 102021. http://dx.doi.org/10.1088/1742-6596/2600/10/102021.

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Abstract The height-to-width ratio (H/W) of canyons has been proven to be a significant indicator related to ventilation performance (airflow status and ventilation efficiency), which can help designers assess urban ventilation performance and guide the design quickly. However, previous research focused on the canyons in ideal geometric settings rather than in the urban context. This study explores whether the relationships between H/W, airflow status, and ventilation efficiency of ideal form studies apply to canyons in the urban context. Firstly, the relationship between the three in ideal ge

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Hou, Min, Jiheng Ni, and Hanping Mao. "Effects of Airflow Disturbance on the Content of Biochemical Components and Mechanical Properties of Cucumber Seedling Stems." Agriculture 13, no. 6 (2023): 1125. http://dx.doi.org/10.3390/agriculture13061125.

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In order to explore the changes in biochemical components and mechanical properties of cucumber seedlings with dwarfing characteristics under airflow disturbance treatment, ‘Jinyou No. 1’ cucumber seedlings were used as experimental materials and the split-plot design was used. The cucumber seedlings were treated with airflow disturbance with two airflow temperatures of 25 ± 5 °C and 35 ± 5 °C as the main factors and four airflow velocities of 1, 3, 6 and 9 m/s as the secondary factors. At the same time, cucumber seedlings without airflow disturbance were used as controls to study the effects

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Shang, Shanshan, Chongwen Yu, and Meiling Li. "Numerical simulation of swirling airflow dynamics in vortex spinning." Textile Research Journal 88, no. 7 (2017): 833–43. http://dx.doi.org/10.1177/0040517517690631.

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In this paper, a computational fluid dynamics model has been established and a three-dimensional numerical simulation of the flow characteristics of airflow in a vortex spinning nozzle has been carried out. A realizable k-ɛ model is used to simulate the turbulence of airflow in the nozzle. Unstructured tetrahedral grids which have good adaptability to complex boundaries are used in this paper to mesh the computational region. The computational model of the airflow field is solved and the characteristics of airflow in a vortex spinning nozzle are obtained. The results show that the flow princip

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Sun, Wangsheng, Haiqing Si, Yao Li, Haibo Wang, Jingxuan Qiu, and Gen Li. "Fuzzy Control Algorithm Applied on Constant Airflow Controlling of Fans." Energies 16, no. 11 (2023): 4425. http://dx.doi.org/10.3390/en16114425.

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Keeping a certain constant airflow in a lot of applications is critical, such as certain airflow volumes in the cabin of an aircraft, submarines, tunnels, and buildings. All fans change their output airflow and air pressure by changing motor speed in real applications. In order to achieve the target airflow volume, normal operation detects the data first, then provides orders to engineers to adjust manually. Extra airflow volume sensors are equipped to measure the airflow so that people know what the current airflow is and how much needs to be adjusted. Based on normal technology, airflow volu

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Wang, Yu. "Experimental Investigations on Effect of Particles Removal in Cleanroom with Non-Unidirectional Airflow." Applied Mechanics and Materials 580-583 (July 2014): 2428–31. http://dx.doi.org/10.4028/www.scientific.net/amm.580-583.2428.

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Efficient airflow delivery is key to achieve effective contamination control for a high-performance cleanroom. The influence of airflow organization on effect of particles removal in cleanroom with non-unidirectional airflow was investigated in this paper. A series of experiments were conducted on a cleanroom experimental platform with different airflow organization modes and supply air volume variation by frequency converter ( 40 to 50 Hz, 5Hz interval) on air-supply fan unit. The results showed that higher cleanliness could be gained at local area in cleanroom with radial airflow organizatio

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Szlązak, Nikodem, Dariusz Obracaj, and Marek Korzec. "Influence of Applying Additional Forcing Fans for the Air Distribution in Ventilation Network." Management Systems in Production Engineering 23, no. 3 (2016): 163–71. http://dx.doi.org/10.2478/mspe-04-03-2016.

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Abstract Mining progress in underground mines cause the ongoing movement of working areas. Consequently, it becomes necessary to adapt the ventilation network of a mine to direct airflow into newly-opened districts. For economic reasons, opening new fields is often achieved via underground workings. Length of primary intake and return routes increases and also increases the total resistance of a complex ventilation network. The development of a subsurface structure can make it necessary to change the air distribution in a ventilation network. Increasing airflow into newly-opened districts is n

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Liu, Qiuyi. "Density and Small Disturbance Equation-Based Simulation of Designed Bipalne Airfoil Under Supersonic Flow." Highlights in Science, Engineering and Technology 37 (March 18, 2023): 291–98. http://dx.doi.org/10.54097/hset.v37i.6084.

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For inviscid airflows, the small disturbance equation (SDE), as a condensed form of the full potential equation, is an effective approach for characterising the behaviour of this type of airflow in the presence of thin obstacles in its path. Density-based solutions (DBS) are frequently used by ANSYS to model the airflow behavior under the same environment. Through the impact of shock interference between the target wings, special Bussemann-type supersonic biplane designs can be effective in restricting sonic booms and wave drags in particular supersonic conditions. The modeling investigations

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Vasiutynska, Kateryna, Vasyl Arsirii, Sergiy Smyk, and Olena Makovetska. "Determination of the design features of roadside air protection barriers of urban motorways using visual diagnostics and computational modelling." Eastern-European Journal of Enterprise Technologies 2, no. 10 (134) (2025): 25–34. https://doi.org/10.15587/1729-4061.2025.326375.

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This study considers the aerodynamic characteristics of airflows on highways with protective roadside barriers. The task to optimize roadside barriers was addressed by analyzing airflow aerodynamic patterns using physical modeling and computational simulation. A flow structure visual diagnostics method (FSVD) was employed to analyze the kinematic features of airflow formation in the roadside barrier zone. It was established that the use of discrete-type barriers leads to the formation of stable air structures that enhance active flow mixing and dilution through external air entrainment. Each d

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