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Artículos de revistas sobre el tema "Air velocity measuring"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 6 de febrero de 2022

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1

Joseph, Ron. "Measuring Air Velocity in Occupied vs. Unoccupied Spray Booths." Metal Finishing 105, no. 9 (2007): 46–48. http://dx.doi.org/10.1016/s0026-0576(07)80219-4.

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2

Lee, Chin H., and Jerry D. Ramsey. "Should Wet-Bulb Thermometers be Shielded when Measuring Heat Stress?" Proceedings of the Human Factors Society Annual Meeting 30, no. 10 (1986): 982–84. http://dx.doi.org/10.1177/154193128603001008.

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An experiment was performed in order to investigate the effect of radiant heat on wet bulb temperature measurement. It was found that the radiant heat affect the natural wet bulb temperature and this effect becomes larger as the radiant heat level becomes higher and air velocity becomes lower. This radiant heat and air velocity effect on natural wet bulb temperature is quantified. Also, a set of relationship between unshielded and shielded natural wet bulb temperatures under various radiant heat and air velocity was found.
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3

Veron, Fabrice, W. Kendall Melville, and Luc Lenain. "Infrared Techniques for Measuring Ocean Surface Processes." Journal of Atmospheric and Oceanic Technology 25, no. 2 (2008): 307–26. http://dx.doi.org/10.1175/2007jtecho524.1.

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Abstract Ocean surface processes, and air–sea interaction in general, have recently received increased attention because it is now accepted that small-scale surface phenomena can play a crucial role in the air–sea fluxes of heat, mass, and momentum, with important implications for weather and climate studies. Yet, despite good progress in recent years, the air–sea interface and the adjacent atmospheric and marine boundary layers have proven to be difficult to measure in all but the most benign conditions. This has led to the need for novel measurement techniques to quantify processes of air–se
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4

Yang, Xing Sen, and Jing Yin. "Flow Measurement of Primary Air Containing Pulverized Coal with Simple Venturi Tube." Advanced Materials Research 986-987 (July 2014): 1506–9. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.1506.

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The flow measurement of primary air is very important for thermal power plants to maintain the safe state of operation. For direct firing pulverizing system, the measuring is essentially affected by pulverized coal particles. Abrasion and occlusion would bring great trouble to the measurement. Many measuring methods are invalid under that circumstance. Lots of efforts have been made to find appropriate ways to measure the flow of primary air containing pulverized coal. Venturi tube had been successfully used to measure the flow of air. If a venturi tube is used to measure the flow velocity of
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5

Alongi, Andrea, Adriana Angelotti, and Livio Mazzarella. "Measuring a Breathing Wall's effectiveness and dynamic behaviour." Indoor and Built Environment 29, no. 6 (2019): 783–92. http://dx.doi.org/10.1177/1420326x19836457.

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Breathing Walls are building structures based on porous materials crossed by an airflow, which act both as building envelopes and ventilation system components. In climates where both heating and cooling are needed, a pro-flux configuration (heat and air mass both flowing in the same direction) might be alternated with a contra-flux configuration (heat and air mass flowing in opposite directions) during the year or even on a day. Understanding and modelling the Breathing Walls' stationary and dynamic behaviour is thus fundamental, in order to optimize their design and to fully exploit their en
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6

Yan, Ming De, Han Ping Mao, and Wei Dong Jia. "Experimental Study on the Gas-Liquid Two Phase Flow of Air-Assist Boom Spraying." Applied Mechanics and Materials 341-342 (July 2013): 371–74. http://dx.doi.org/10.4028/www.scientific.net/amm.341-342.371.

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The velocity and diameter distribution of the air-assist boom spraying is studied by a laser Phase Doppler Partic1e Analyzer when the operational parameters is changed, which including airflow velocity of air curtain and vertical relative position between the air curtain and the nozzle. From the experimental results, we find the as the air curtain velocity increases , the size distribution of the droplet is conducive to uniform . At the same air curtain velocity, droplet size decreases with increasing of nozzle pressure. On the right side of each measuring point, the number of droplets is grad
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7

Geng, Ling Xin, Li Jian Zhang, and Qing Xiang Shi. "Fluid Field Analysis for Cyclone Separator Used on Grain Cleaning." Advanced Materials Research 605-607 (December 2012): 1369–71. http://dx.doi.org/10.4028/www.scientific.net/amr.605-607.1369.

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Gas velocity in cyclone separator is measured by testing with laser Doppler velocimeter in this paper. The measuring results indicates that tangential velocity, axial velocity, radial velocity of air distribute following some certain rules, reasonable selected structure parameters can improve separating efficiency
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8

Arens, Edward, Ali Ghahramani, Richard Przybyla, et al. "Measuring 3D indoor air velocity via an inexpensive low-power ultrasonic anemometer." Energy and Buildings 211 (March 2020): 109805. http://dx.doi.org/10.1016/j.enbuild.2020.109805.

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9

Zasukhin, I. N., and V. G. Bernadskii. "Instruments for measuring air velocity in ventilation systems meant for different functions." Measurement Techniques 34, no. 10 (1991): 1035–38. http://dx.doi.org/10.1007/bf00981061.

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10

Zhou, Yun Long, and Ning Yang. "Riser Pipe Pressure Pulsation Standard Deviation Fast Forecast Spouted Bed Granular Poly Group." Applied Mechanics and Materials 448-453 (October 2013): 3397–402. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.3397.

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At the different elevation of the spouted bed riser pipe layout pressure measuring point, each point below is equipped with purge air, avoid the granular poly group on the pressure measuring point, by adjusting the frequency of the bandpass filter, guarantee the accuracy of pressure measurement. Through experimental study, under the low superficial air velocity, riser pipe pressure pulsation standard deviation has a linear relationship with the superficial air velocity and obey the chi-square distribution, based on the above found , rising pipe pressure pulsation standard deviation forecast th
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11

Zhang, Jing Zhao, Yong Sheng Yan, Zhen Guo Yan, and Feng Liang Wu. "Numerical Analysis of Air Measuring Station Location Optimization in Underground Mine Airway." Advanced Materials Research 960-961 (June 2014): 621–24. http://dx.doi.org/10.4028/www.scientific.net/amr.960-961.621.

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The optimized air measuring station location of mine airway based on air fully developed was proposed and numerical tests were conducted with six models. The independence of air fully development and inlet velocity was analyzed which validated the models and the numerical methods. The results show that optimized air measuring station location in head entry is 132m-198m after the airway turning while 5.0m-10.1m before the airway turning in tail entry.
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12

Chusni, Muhammad Minan, Khoirun Nisa, Muhammad Haidir, and Rismaya Fitriyani. "Penerapan Diferensial untuk Mengukur Laju Perubahan Volume Air Galon." JIPFRI (Jurnal Inovasi Pendidikan Fisika dan Riset Ilmiah) 2, no. 1 (2018): 8–13. http://dx.doi.org/10.30599/jipfri.v2i1.136.

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The aim of this research is to apply Torricelli law in order to determine flow velocity of fluid by calculating the rate of change of gallon bottled water volume by using the derived equation and measuring the time required until the water in the gallon is exhausted. This research used experimental method by varying the height of liquid in gallons so that the variation of fluid velocity and the rate of volume change are obtained. The results show that the maximum fluid velocity was 0.22 m/s with a rate of change of volume of 0,010 m3/s, and the minimum fluid velocity of 0.063 m/s with a rate o
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13

Cascione, Valeria, Eugenio Cavone, Daniel Maskell, Andy Shea, and Pete Walker. "The effect of air velocity on moisture buffering." MATEC Web of Conferences 282 (2019): 02007. http://dx.doi.org/10.1051/matecconf/201928202007.

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Hygoscopic finishing materials improve the indoor hygrothermal comfort and air quality, as they reduce the extremes of variation in relative humidity. This property, known as moisture buffering, is related to the capacity of hygroscopic materials to adsorb and desorb moisture from the air. Air velocity plays an important role on the sorption performances of materials: increasing the air speed leads to increased moisture buffering capacity. In order to obtain comparable results, several moisture buffering protocols require the air speed to be constant and around 0.1 m/s during tests. However, t
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14

Ren, X., J. E. Sanders, A. Rajendran, et al. "A relaxed eddy accumulation system for measuring vertical fluxes of nitrous acid." Atmospheric Measurement Techniques 4, no. 10 (2011): 2093–103. http://dx.doi.org/10.5194/amt-4-2093-2011.

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Abstract. A relaxed eddy accumulation (REA) system combined with a nitrous acid (HONO) analyzer was developed to measure atmospheric HONO vertical fluxes. The system consists of three major components: (1) a fast-response sonic anemometer measuring both vertical wind velocity and air temperature, (2) a fast-response controlling unit separating air motions into updraft and downdraft samplers by the sign of vertical wind velocity, and (3) a highly sensitive HONO analyzer based on aqueous long path absorption photometry that measures HONO concentrations in the updrafts and downdrafts. A dynamic v
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15

Ren, X., J. E. Sanders, A. Rajendran, et al. "A relaxed eddy accumulation system for measuring vertical fluxes of nitrous acid." Atmospheric Measurement Techniques Discussions 4, no. 3 (2011): 4105–30. http://dx.doi.org/10.5194/amtd-4-4105-2011.

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Abstract. A relaxed eddy accumulation (REA) system combined with a nitrous acid (HONO) analyzer was developed to measure atmosperhic HONO vertical fluxes. The system consists of three major components: (1) a fast-response sonic anemometer measuring vertical wind velocity and air temperature, (2) a fast-response controlling unit separating air motions into updraft and downdraft samplers by the sign of vertical wind velocity, and (3) a highly sensitive HONO analyzer based on aqueous long path absorption photometry measuring HONO concentations in these updrafts and downdrafts. A dynamic velocity
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16

Briels, T. M. P., J. Kos, G. J. J. Winands, E. M. van Veldhuizen, and U. Ebert. "Positive and negative streamers in ambient air: measuring diameter, velocity and dissipated energy." Journal of Physics D: Applied Physics 41, no. 23 (2008): 234004. http://dx.doi.org/10.1088/0022-3727/41/23/234004.

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17

Elia, M., M. Ulinski, and M. Metghalchi. "Laminar Burning Velocity of Methane–Air–Diluent Mixtures." Journal of Engineering for Gas Turbines and Power 123, no. 1 (2000): 190–96. http://dx.doi.org/10.1115/1.1339984.

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An experimental facility for measuring burning velocity has been designed and built. It consists of a spherical constant volume vessel equipped with a dynamic pressure transducer, ionization probes, thermocouple, and data acquisition system. The constant volume combustion vessel allows for the determination of the burning velocity over a wide range of temperatures and pressures from a single run. A new model has been developed to calculate the laminar burning velocity using the pressure data of the combustion process. The model solves conservation of mass and energy equations to determine the
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18

Dong, Chensong, Chuck Zhang, Ben Wang, and Guoxiong Zhang. "Reducing the Dynamic Errors of Coordinate Measuring Machines." Journal of Mechanical Design 125, no. 4 (2003): 831–39. http://dx.doi.org/10.1115/1.1623185.

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Coordinate measuring machines (CMMs) are already widely utilized as measuring tools in the modern manufacturing industry. Fast and accurate probing is the current trend for the next generation of CMMs. However, measuring velocity of CMM applications are limited by dynamic errors that occur in CMMs. In this paper, the dynamic errors of coordinate measuring machines are analyzed theoretically and experimentally. The limited stiffness of air bearings were found to cause dynamic errors due to the existence of Abbe’s offsets. The characteristics of the air bearings used on CMMs were modeled by the
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19

Dinh, T. Bui. "Taylor bubble velocity measurements in two-phase air/water vertical flow." Vietnam Journal of Mechanics 23, no. 3 (2001): 183–92. http://dx.doi.org/10.15625/0866-7136/9951.

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An experimental technique for the measurement of the instantaneous rising velocity of a single Taylor bubble in two-phase air/water vertical flow is proposed. Measurements are based on the multiple successive digital images and binary image processing techniques. The instantaneous velocity of a bubble is expressed as a function separation distance between the two consecutive bubble nose tips (or the position of the center of the bubble). This experimental technique allows studying and measuring with high accuracy both types of flow: full developed and developing slug flows. The major part of t
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20

Krach, Andrzej, and Janusz Kruczkowski. "Calibration of a system for measuring low air flow velocity in a wind tunnel." Metrologia 53, no. 4 (2016): 1012–23. http://dx.doi.org/10.1088/0026-1394/53/4/1012.

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21

Shkundin, S. Z., V. V. Lashin, and A. V. Likhachev. "Acoustic phase method of measuring the gas flow velocity in a cylindrical air duct." Measurement Techniques 34, no. 11 (1991): 1155–58. http://dx.doi.org/10.1007/bf00979699.

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22

Xie, Sheng, Wanli Han, Xufan Xu, Guojun Jiang, and Baoqing Shentu. "Lateral Diffusion of a Free Air Jet in Slot-Die Melt Blowing for Microfiber Whipping." Polymers 11, no. 5 (2019): 788. http://dx.doi.org/10.3390/polym11050788.

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In melt blowing, microfibrous nonwoven material is manufactured by using high-speed air to attenuate polymer melt. The melt-blown air jet determines the process of polymer attenuation and fiber formation. In this work, the importance of lateral velocity on the fiber was first theoretical verified. The lateral diffused characteristic of the air flow field in slot-die melt blowing was researched by measuring the velocity direction using a dual-wire probe hot-wire anemometer. Meanwhile, the fiber path was captured by high-speed photography. Results showed that there existed a critical boundary of
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23

Bony, Sandrine, and Bjorn Stevens. "Measuring Area-Averaged Vertical Motions with Dropsondes." Journal of the Atmospheric Sciences 76, no. 3 (2019): 767–83. http://dx.doi.org/10.1175/jas-d-18-0141.1.

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Abstract Measurements of vertical profiles of areal-mean mass divergence, vorticity, and vertical velocity, based on dropsondes distributed over an area of 25 000 km2, are presented. The dropsondes were released with high frequency along circular flight patterns during an airborne field campaign taking place over the tropical Atlantic near Barbados. Vertical profiles of the area-averaged mass divergence and vorticity were computed from the horizontal wind profiles, and the area-averaged vertical velocity was then inferred from the divergence. The consistency of measurements over pairs of circl
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24

Liu, Yong Ping, Jia Peng Nie, and Jun Gong. "The Optimization Design for Protection Plate Structure of Honing Measuring Head." Advanced Materials Research 628 (December 2012): 107–10. http://dx.doi.org/10.4028/www.scientific.net/amr.628.107.

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In order to improve the pneumatic gauging precision of honing process, according to the pneumatic gauging characteristic of honing machine, the mathematical model of air current state in measurement process is established with oblique shock wave theory. Through setting up different fillet on protection plate, the air flow state of measurement process could be improved. The change of gas velocity, temperature and pressure was analyzed for different protection plate structure by fluid simulation software, the validity of the theoretical analysis was verified, which can provide the theory basis f
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25

Chae, Je Wook, and Eui Jung Choi. "A Study on the Measuring Device of Muzzle Velocity Using Magnetic Field Gradient Sensor." Key Engineering Materials 345-346 (August 2007): 1173–76. http://dx.doi.org/10.4028/www.scientific.net/kem.345-346.1173.

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In the conventional weapon system, such as gun and small arms, it is a general trend that for maximization of its performance and enhancement of its effectiveness, the fire control system; FCS is developed and applied with the guns and small arms in the world. The FCS of the small arms for infantry man is composed of a few of sensors for acquisition of input data of FCS, such as range measurement, position sensing of weapon, temperature, etc., computer, displayer and power pack, and also the air burst ammunition is developed in parallel for the maximization of effectiveness. Since setting fuse
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26

Zou, Lin Tao, Song Zhang, and Qing Zhang. "Computer Fluid Dynamics Analysis of Cryogenic Oil Mist and Structural Optimization of Spraying Nozzle." Applied Mechanics and Materials 241-244 (December 2012): 1310–15. http://dx.doi.org/10.4028/www.scientific.net/amm.241-244.1310.

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An investigation of the cryogenic oil mist flow field of nozzle was carried out in this study. A domain of the nozzle jet area was modeled with Pro/ENGINEER. CFD (Computational Fluid Dynamics) analysis was used to state the velocity field of different distances from the outlet of nozzle. The simulating velocity field was verified with the experimental results. Experimental results on velocity were measured by SYT-2000 digital multipurpose wind speed gage. The orthogonal experiment was designed to investigate the main effects parameters on velocity and temperature. It indicates that higher flow
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27

Rahman, Ismail Abdul, Jouvan Chandra Pratama Putra, and Ade Asmi. "Assessment of Toilet’s Indoor Air Quality in Relation to Asthmatic People." Modern Applied Science 8, no. 5 (2014): 289. http://dx.doi.org/10.5539/mas.v8n5p289.

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This paper presents an assessment on toilet’s indoor air quality on asthmatic people. The assessment was carried out by measuring temperature, relative humidity, air velocity and SO2 in the 4 selected toilets which are naturally ventilated. The measurements used two equipments that are Yes Plus LGA meter and Anemometer. It was done in early morning and break hours for 10 minutes within three (3) days consecutively. This study found that SO2 concentration in toilet 1 exceeded the threshold limit value of SO2 for 10 minutes exposure which means this toilet potentially trigger asthmatic symptom f
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28

Khovanskyi, Serhii, Ivan Pavlenko, Jan Pitel, Jana Mizakova, Marek Ochowiak, and Irina Grechka. "Solving the Coupled Aerodynamic and Thermal Problem for Modeling the Air Distribution Devices with Perforated Plates." Energies 12, no. 18 (2019): 3488. http://dx.doi.org/10.3390/en12183488.

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The article is focused on the comprehensive analysis of the aerodynamics of air distribution devices with the combined heat and mass exchange, with the aim to improve the following hydro- and thermodynamic parameters of ventilation systems: flow rate, air velocity, hydraulic losses, and temperature. The inadequacy of the previously obtained characteristics has confirmed the need for more rational designs of air distribution systems. Consequently, the use of perforated plates was proposed to increase hydraulic losses for reducing the average velocity and ensuring a uniform distribution of the v
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29

Pereira, Valdir Moraes, and Gladis Camarini. "Air Permeability of Concrete by Thenoz Method." Advanced Materials Research 224 (April 2011): 132–36. http://dx.doi.org/10.4028/www.scientific.net/amr.224.132.

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Permeability of cement-based materials is the principal factor that provides its durability. Thus, several methodologies have been developed for measuring this property. Discrepancies in results can be generated due to large number of methods, mathematics equations and methodologies employed. Thenoz method is one method developed for measuring air permeability of porous media and have demonstrated good and satisfactory results, in accordance to several scientific researches. The aim of this work was to study the flow mechanism in a porous media, in particular a concrete media, evaluating Reyno
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30

Mesarchaki, E., C. Kräuter, K. E. Krall, et al. "Measuring air–sea gas-exchange velocities in a large-scale annular wind–wave tank." Ocean Science 11, no. 1 (2015): 121–38. http://dx.doi.org/10.5194/os-11-121-2015.

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Abstract. In this study we present gas-exchange measurements conducted in a large-scale wind–wave tank. Fourteen chemical species spanning a wide range of solubility (dimensionless solubility, α = 0.4 to 5470) and diffusivity (Schmidt number in water, Scw = 594 to 1194) were examined under various turbulent (u10 = 0.73 to 13.2 m s−1) conditions. Additional experiments were performed under different surfactant modulated (two different concentration levels of Triton X-100) surface states. This paper details the complete methodology, experimental procedure and instrumentation used to derive the t
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31

Mesarchaki, E., C. Kräuter, K. E. Krall, et al. "Measuring air–sea gas exchange velocities in a large scale annular wind-wave tank." Ocean Science Discussions 11, no. 3 (2014): 1643–89. http://dx.doi.org/10.5194/osd-11-1643-2014.

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Abstract. In this study we present gas exchange measurements conducted in a large scale wind-wave tank. Fourteen chemical species spanning a wide range of solubility (dimensionless solubility, α = 0.4 to 5470) and diffusivity (Schmidt number in water, Scw = 594 to 1194) were examined under various turbulent (u10 = 0.8 to 15 m s−1 conditions. Additional experiments were performed under different surfactant modulated (two different concentration levels of Triton X-100) surface states. This paper details the complete methodology, experimental procedure and instrumentation used to derive the total
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32

Shkundin, S. Z., and D. S. Belikov. "Ways to improve the accuracy of measuring the air flow velocity of the acoustic anemometer." Mining informational and analytical bulletin 5, no. 14 (2019): 3–12. http://dx.doi.org/10.25018/0236-1493-2019-5-14-3-12.

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33

Tarasenko, V. F., G. V. Naidis, D. V. Beloplotov, D. A. Sorokin, M. I. Lomaev, and N. Yu Babaeva. "Measuring and Modeling Streamer Velocity at an Air Discharge in a Highly Inhomogeneous Electric Field." Plasma Physics Reports 46, no. 3 (2020): 320–27. http://dx.doi.org/10.1134/s1063780x20030113.

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34

You, Jang Youl, Sun Young Paek, Doo Kie Kim, and Ki Pyo You. "The Wind Flow Characteristics Measuring Simulations of Soundproof Tunnels on Expressways." Applied Mechanics and Materials 878 (February 2018): 70–75. http://dx.doi.org/10.4028/www.scientific.net/amm.878.70.

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Soundproof tunnels and soundproof walls constructed on expressways are designed to prevent noise for the nearby surrounding residential areas. These soundproof walls and tunnels feature excellent noise prevention for residential areas nearby, but they hamper the dispersion of air pollutants generated, thus promoting the creation of heat islands during summer and cold islands during winter.The computational fluid dynamics (CFD) analysis method was used to investigate the wind flow around soundproof tunnels. The wind angle and the size of the wind velocity were determined using data from weather
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35

Chai, Min-Lun, Yu-Hsuan Chang, Chih-Hung Lin, Jin-Cyuan Tsai, Jhen-You Chin, and Ratna Nur Inten. "Investigations on Predictions and Characteristics of Flow Field in the Pipelines of Chillers for Measured Locations of Ultrasonic Flowmeters by CFD Approach." International Journal of Air-Conditioning and Refrigeration 29, no. 02 (2021): 2150014. http://dx.doi.org/10.1142/s2010132521500140.

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The flow velocity profiles in most of the central air-conditioning pipelines are, in general, not fully developed flow and difficult to obtain the accurate flow rates by flowmeters, which are used for measuring average velocity. Especially for being at the outlet of an elbow, the accuracy of flow rate by measurement is quite low. Therefore, there are some limitations for measurements of flow rate and velocity profile by the present flow measuring technologies. The objective of this study was to establish an approach on accurate predictions of velocity profiles at different measured locations o
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36

Kruczkowski, Janusz, Jerzy Krawczyk, and Piotr Ostrogórski. "Laboratory Investigations of Stationary Methane Anemometer." Archives of Mining Sciences 62, no. 4 (2017): 893–909. http://dx.doi.org/10.1515/amsc-2017-0061.

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Abstract This paper presents a new stationary device that can perform simultaneous measurements of air flow velocity and methane concentration in a mine heading (stationary methane anemometer). The test station is designed to use the instrument to test the effect of various parameters on the air-methane stream. The air velocities and methane concentrations were fed to the measuring area via an injector and recorded. The results present numerical simulations of flow phenomena that occurred during measurement experiments.
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37

Friso, Dario. "An Approximate Analytic Solution to a Non-Linear ODE for Air Jet Velocity Decay through Tree Crops Using Piecewise Linear Emulations and Rectangle Functions." Applied Sciences 9, no. 24 (2019): 5440. http://dx.doi.org/10.3390/app9245440.

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The velocity of air that crosses the canopy of tree crops when using orchard sprayers is a variable that affects pesticide dispersion in the environment. Therefore, having an equation to describe air velocity decay through the canopy is of interest. It was necessary to start from a more general non-linear ordinary differential equation (ODE) obtained from the momentum theorem. After approximating the non-linearity with some piecewise linear terms, analytic solutions were found. Subsequently, to obtain a single equation for velocity decay, a combination of these solutions was proposed by using
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38

YAMASAKI, Yudai, and Norimasa IIDA. "Study of Measuring Burning Velocity of Fuel-Air Mixture under Compression by Using Double Kernel Method." Transactions of the Japan Society of Mechanical Engineers Series B 66, no. 649 (2000): 2485–92. http://dx.doi.org/10.1299/kikaib.66.649_2485.

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39

Harion, J. L., M. Favre-Marinet, and B. Camano. "An improved method for measuring velocity and concentration by thermo-anemometry in turbulent helium-air mixtures." Experiments in Fluids 22, no. 2 (1996): 174–82. http://dx.doi.org/10.1007/s003480050035.

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40

Papadopoulos, K. H., A. T. Soilemes, C. G. Helmis, et al. "A Triple Hot-Wire System for Indoor Air Flow Measurements." Journal of Solar Energy Engineering 118, no. 3 (1996): 168–76. http://dx.doi.org/10.1115/1.2870908.

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The application of a home made, triple hot-wire system in indoor air flow measurements is presented. Both the anemometer and sensor have been developed at Athens University with the aim to provide a reliable, research tool of reasonable cost, simple construction, and satisfactory performance. All three velocity components above a threshold of 10 cm s−1 can be measured. The system is also equipped with two thermometers for measuring the mean and fluctuating air temperature and for providing a means of temperature compensation of the hot wires’ signal. After evaluation of the system in the labor
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41

Soldatkin, V. M., and E. S. Efremova. "Features of Construction and Analysis of Static Accuracy of the Vortex Air Data System of Subsonic Aircraft." Mekhatronika, Avtomatizatsiya, Upravlenie 20, no. 7 (2019): 443–48. http://dx.doi.org/10.17587/mau.20.443-448.

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The importance of information is noted and the defects of traditional air data systems are described, implementing aerometric, aerodynamic and directional methods using straddled in the fuselage of the air pressure receiver, temperature braking receivers, sensors aerodynamic angles of attack and slip. The features of construction and advantages of the original vortex air data system with one stationary receiver of primary information and frequency-time primary informative signals based on the original vortex sensor of aerodynamic angle and true air velocity with a hole-receiver of static press
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42

Breesch, Hilde, Bart Merema, and Alexis Versele. "Ventilative Cooling in a School Building: Evaluation of the Measured Performances." Fluids 3, no. 4 (2018): 68. http://dx.doi.org/10.3390/fluids3040068.

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The test lecture rooms on Katholieke Universiteit Leuven (KU Leuven) Ghent Technology Campus (Belgium) are a demonstration case of Annex 62: Ventilative Cooling of the International Energy Agency’s Energy in Buildings and Communities programme (IEA EBC). The building is cooled by natural night ventilation and indirect evaporative cooling (IEC). Thermal comfort and the performances of ventilative cooling are evaluated. Long-term measurements of internal temperatures, occupancy, opening of windows and IEC were carried out in the cooling season of 2017. The airflow rates through the windows in cr
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43

Huang, Chao, Fang Wang, Zhi Min Wu, and Chao Guo. "Air-Flow Distribution Simulation and Experimental Analysis of a New Testing Room for Refrigerated Display Cabinet." Advanced Materials Research 614-615 (December 2012): 701–6. http://dx.doi.org/10.4028/www.scientific.net/amr.614-615.701.

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Based on European Standard EN441-2, an experiment system for measuring the thermal properties of refrigerated display cabinet is designed and constructed. Considering the practice requirements from user, the air distribution analysis is doing under various air-flow form in the testing room. This paper uses the FLUENT, which is one of the CFD simulation software, to verify the design method of air movement. Finally a series of tests required for laboratory quality regulation have been done and the data of velocity or temperature is under the new requirement.
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44

Wang, Li Hui, Jia Ni Liu, Dao Fa Tang, Li Shen, and Cheng Luo. "Research on the Coupling Airflows between Subway Piston Wind and Platform Jet with Liquid Scale Model Test." Advanced Materials Research 374-377 (October 2011): 626–29. http://dx.doi.org/10.4028/www.scientific.net/amr.374-377.626.

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The liquid scale model test is set up to research on the velocity characteristics of coupling airflows between subway piston wind and platform air jet. Model test and prototype meet the dynamic similarity. Piston wind variation rules on the test are validated with previous conclusions. The coupling airflows trajectory is closer to the horizontal direction with increasing piston wind. Under the constant air supply, the coupling velocities of measuring points increase with piston wind growing. The piston wind has more obvious influence on the coupling airflows than air jet.
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45

Jamróz, Paweł. "Effect of the Continuous Traverse Trajectory and Dynamic Error of the Vane Anemometer on the Accuracy of Average Velocity Measurements at the Cross-Section of the Mine Heading – Model-Based Testing." Archives of Mining Sciences 59, no. 4 (2014): 1051–60. http://dx.doi.org/10.2478/amsc-2014-0072.

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Abstract This paper discusses the problem of measuring the average velocity at the cross-section of mine heading with the use of the continuous traverse method. Based on model testing, it has been shown that measurement signals, obtained along the traversing trajectory, belong to the group of non-stationary signals. The methodology of the traversing method measurements, with the aspect of capabilities of measuring instruments used for that purpose, has been analysed. Results of simulation tests concerning the dynamic response of a vane anemometer to the measurement signal for selected trajecto
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46

Ziolkowski, Anton. "Measurement of air‐gun bubble oscillations." GEOPHYSICS 63, no. 6 (1998): 2009–24. http://dx.doi.org/10.1190/1.1444494.

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In this paper, I provide a theoretical basis for a practical approach to measuring the pressure field of an air gun array and present an algorithm for computing its wavefield from pressure measurements made at known positions in the vicinity of the gun ports. The theory for the oscillations of a single bubble is essentially a straight‐forward extension of Lamb’s original paper and provides a continuous, smooth transition from the oscillating wall of the bubble to the far‐field, preserving both the fluid flow and the acoustic radiation, all to the same accuracy and valid for bubbles with initia
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47

Sutherland, Peter, and W. Kendall Melville. "Measuring Turbulent Kinetic Energy Dissipation at a Wavy Sea Surface." Journal of Atmospheric and Oceanic Technology 32, no. 8 (2015): 1498–514. http://dx.doi.org/10.1175/jtech-d-14-00227.1.

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AbstractWave breaking is thought to be the dominant mechanism for energy loss by the surface wave field. Breaking results in energetic and highly turbulent velocity fields, concentrated within approximately one wave height of the surface. To make meaningful estimates of wave energy dissipation in the upper ocean, it is then necessary to make accurate measurements of turbulent kinetic energy (TKE) dissipation very near the surface. However, the surface wave field makes measurements of turbulence at the air–sea interface challenging since the energy spectrum contains energy from both waves and t
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48

Petrov, Victor, and Alexandra Starnikova. "The Study of the Structure Based on the Array of ZnO-Nanorods as a Sensor of the Gas Flow Rate." Proceedings 42, no. 1 (2020): 42. http://dx.doi.org/10.3390/ecsa-6-06643.

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This work shows the possibility of using arrays of ZnO nanorods grown on a glass substrate as a sensitive element for measuring air flow velocity. Since oxide semiconductors have a temperature dependence of resistance, a theoretical and experimental assessment was made of the influence of air velocity on the increase in resistance of a sensitive element. It has been theoretically shown that when air is blown through, the temperature of the free end of the ZnO nanorod can decrease by several degrees. An experimental evaluation showed that when gas is blown at a speed of 12.5 cm/s, the resistanc
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49

Dudnyk, Mykhailo, Viktor Veretennyk, Serhii Enhel, Vadym Krytskyi, and Vadym Myroshnychenko. "Ground parameters of working standard of reproduction of small speeds of air stream." E3S Web of Conferences 109 (2019): 00021. http://dx.doi.org/10.1051/e3sconf/201910900021.

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As a working standard for research in the area the lowest air velocity can be used a rotary stand. In Ukraine it was not standard measuring instruments of low speeds of air flow. Used Ukrmetrteststandart the Pito-Prandl model pressure tube has a precision class of 0.5, but the range of measurements start only with 5 m/s. In the Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine was developed, created and perfected the standard stand RESVP-1, which allowed the creation of small air velocities. The considered method of aeromechanical measurements
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50

Gao, Bing Guang, Hai Xia Li, Xia Ping Wen, and Fa Hui Wang. "Automatic Monitoring System of Centrifugal Fan Performance." Applied Mechanics and Materials 42 (November 2010): 417–20. http://dx.doi.org/10.4028/www.scientific.net/amm.42.417.

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The centrifugal fan performance experiment system was introduced. The structure, function, measuring principle of the system is analyzed. The experimental system consists of centrifugal fan, air hose, computer and test software. The experiment system can automatically measure and process centrifugal fan performance parameters. The distribution of gas velocity at fan outlet can be measured by five hole probe device.
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