Relevant bibliographies by topics / Airflow measurements

Academic literature on the topic 'Airflow measurements'

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Published: 4 June 2021
Last updated: 2 February 2022

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Journal articles on the topic "Airflow measurements"

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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 building, detailed measurements were conducted in the vents. Linear regression was applied to velocity measurements taken in the vents and at a 10 m mast (meteomast) located 20 m away. The detailed airflow measurements were used to validate statistical models. Results showed that the velocity distribution in the ridge vent could be modeled accurately and precisely for all wind directions (R2 > 89%). Models for unidirectional airflows showed high predictability for the side vent (R2 > 92%). Models for bidirectional airflows showed good predictability for the windward side when the air flowed in the same direction as the outside wind (R2 > 88%) but showed less accurate results for the leeward side as well as for airflows moving in the opposite direction to the outside wind. For all models and wind directions, the most important input variable was the velocity component measured perpendicular to the vents at the meteomast. The importance of the velocity component measured parallel to the vents increased near the edges of the vent when the vent was on the windward side but did not reach the importance of the perpendicular component. The results confirmed the importance of using different models for unidirectional and bidirectional airflows to obtain accurate airflow assessments. Keywords: Airflow rate distribution, Mock-up building, Natural ventilation, Ultrasonic anemometer.
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Marano, Giuseppe. "Airflow measurements in small animals." Laboratory Animals 28, no. 3 (July 1, 1994): 239–43. http://dx.doi.org/10.1258/002367794780681624.

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Monitoring respiratory airflow is extremely important in pharmacological studies of the respiratory system. However, in mechanically ventilated small animals (e.g. rats and guinea pigs) the use of a commercial pneumotachometer, attached directly to the tracheal cannula, substantially increases the equipment dead space (the volume shared by inspired and expired gases). Since apparatus dead space must be added to the tidal volume (determined on the basis of ventilatory rate and animal body weight) necessary to meet the respiratory needs of the animal, the resulting stroke volume is greatly increased, specially in very small animals. This results in an increase in intrathoracic pressure which is potentially associated with a decrease in venous return, cardiac output, and arterial pressure. The author investigated the possibility of avoiding the potential problems of the added instrumental dead space by software-summing the separate flows measured on the inflation and deflation limbs of the breathing circuit. This study shows that the summation of the flow signals obtained from separate pneumotachometers on the inspiratory and expiratory arms of the breathing circuit is not dissimilar to the total flow as measured by a pneumotachometer directly attached to the tracheal cannula and that the method here described can be an advantageous alternative to the employment of a single pneumotachometer.
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Tang, Xiaoning, and Xiong Yan. "Airflow resistance of acoustical fibrous materials: Measurements, calculations and applications." Journal of Industrial Textiles 49, no. 8 (October 15, 2018): 981–1010. http://dx.doi.org/10.1177/1528083718805714.

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The acoustic performance of fibrous materials is mainly determined by its airflow resistance, and it is a parameter of the resistance that the airflow meets through the materials. This paper has summarized the recent advances on the measurements, calculations and applications of airflow resistance. Firstly, different methods for airflow resistance measurements are presented, mainly including the direct airflow method, alternating airflow method and acoustical method. We have summarized the development history, current status and industrial applications of these methods. Secondly, this paper has summarized the models of calculating airflow resistance. Most of these empirical models are based on the characteristic parameters of fibrous materials, for instance bulk density, fiber diameter, porosity and thickness. Thirdly, this review has gathered the applications of airflow resistance in sound absorption and noise control. It is a crucial parameter in the prediction of both normal incidence sound absorption and reverberation chamber sound absorption. In conclusion, this review has concluded with some perspectives for the measurements, calculations and applications of airflow resistance.
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M'zoughi, Fares, Izaskun Garrido, Aitor J. Garrido, and Manuel De La Sen. "ANN-Based Airflow Control for an Oscillating Water Column Using Surface Elevation Measurements." Sensors 20, no. 5 (February 29, 2020): 1352. http://dx.doi.org/10.3390/s20051352.

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Oscillating water column (OWC) plants face power generation limitations due to the stalling phenomenon. This behavior can be avoided by an airflow control strategy that can anticipate the incoming peak waves and reduce its airflow velocity within the turbine duct. In this sense, this work aims to use the power of artificial neural networks (ANN) to recognize the different incoming waves in order to distinguish the strong waves that provoke the stalling behavior and generate a suitable airflow speed reference for the airflow control scheme. The ANN is, therefore, trained using real surface elevation measurements of the waves. The ANN-based airflow control will control an air valve in the capture chamber to adjust the airflow speed as required. A comparative study has been carried out to compare the ANN-based airflow control to the uncontrolled OWC system in different sea conditions. Also, another study has been carried out using real measured wave input data and generated power of the NEREIDA wave power plant. Results show the effectiveness of the proposed ANN airflow control against the uncontrolled case ensuring power generation improvement.
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Miller, Creighton J., and Raymond Daniloff. "Airflow measurements: Theory and utility of findings." Journal of Voice 7, no. 1 (March 1993): 38–46. http://dx.doi.org/10.1016/s0892-1997(05)80110-9.

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Blonshine, Susan, and Michael D. Goldman. "Optimizing Performance of Respiratory Airflow Resistance Measurements." Chest 134, no. 6 (December 2008): 1304–9. http://dx.doi.org/10.1378/chest.06-2898.

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Wodziak, Waldemar, and Jacek Sobczyk. "PIV measurements of airflow past multiple cylinders." EPJ Web of Conferences 180 (2018): 02121. http://dx.doi.org/10.1051/epjconf/201817002121.

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Wodziak, Waldemar, and Jacek Sobczyk. "PIV measurements of airflow past multiple cylinders." EPJ Web of Conferences 180 (2018): 02121. http://dx.doi.org/10.1051/epjconf/201818002121.

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Flow characteristics in vicinity of six circular cylinders aligned inline was investigated experimentally by means of PIV method. Experiments were conducted in a low speed closed circuit wind tunnel. Inflow velocity was 1.2 m/s which corresponds to Re=1600 based on the cylinder diameter. Spacing ratio between cylinders L/D was 1.5. Instantaneous and averaged velocity fields were presented. Experiments were designed in order to use their results as a test case for future numerical calculations.
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Pesic, Radivoje, Aleksandar Davinic, Snezana Petkovic, Dragan Taranovic, and Danijela Miloradovic. "Aspects of volumetric efficiency measurement for reciprocating engines." Thermal Science 17, no. 1 (2013): 35–48. http://dx.doi.org/10.2298/tsci120531153p.

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The volumetric efficiency significantly influences engine output. Both design and dimensions of an intake and exhaust system have large impact on volumetric efficiency. Experimental equipment for measuring of airflow through the engine, which is placed in the intake system, may affect the results of measurements and distort the real picture of the impact of individual structural factors. This paper deals with the problems of experimental determination of intake airflow using orifice plates and the influence of orifice plate diameter on the results of the measurements. The problems of airflow measurements through a multi-process Otto/Diesel engine were analyzed. An original method for determining volumetric efficiency was developed based on in-cylinder pressure measurement during motored operation, and appropriate calibration of the experimental procedure was performed. Good correlation between the results of application of the original method for determination of volumetric efficiency and the results of theoretical model used in research of influence of the intake pipe length on volumetric efficiency was determined.
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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 (November 29, 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 and resulting heat demand was compared with the design values. The pros and cons of various methods for evaluation of natural ventilation are discussed. The real airflow was determined by measurements in a ventilation grille or by a tracer gas concentration decay method. The airtightness of the buildings’ envelope was evaluated based on the fan pressurization test. The last stage entailed computer simulations of air exchange in buildings using CONTAM software. The multizone models of the buildings were calibrated and verified with existing measured data. Measured airflow in a multifamily house was small and substantially deviated from the Polish standard. In case of a school, the air flow rate amounted to an average of 10% of the required value. Calculation of the heat demand for ventilation based on the standard value of the airflow led to a considerable overestimation of this value in relation to the real consumption. In the analyzed cases, the difference was 40% for the school and 30% for the residential building.
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Dissertations / Theses on the topic "Airflow measurements"

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Louka, Petroula. "Measurements of airflow in an urban environment." Thesis, University of Reading, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312298.

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Essah, Emmanuel Adu. "Modelling and measurements of airflow and ventilation within domestic pitched roofs." Thesis, Glasgow Caledonian University, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.517937.

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Wiggs, Giles F. S. "Airflow over Barchan dunes : field measurements, mathematical modelling and wind tunnel testing." Thesis, University College London (University of London), 1992. http://discovery.ucl.ac.uk/1317535/.

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There are few empirical measurements of velocity, shear velocity, sand transport, morphological change on the windward slopes of dunes.This thesis compares field measurements on a barchan dune in Oman with calculations using a mathematical model (FLOWSTAR) and measurements in a wind tunnel. All three techniques demonstrate similar patterns of velocity, confirming the acceleration of flow up the windward slope, deceleration between the crest and brink and significant flow deceleration upwind of and at the toe of the dune. The FLOWSTAR model is unable accurately to predict airflow at the brink and its predictions near the surface are highly susceptible to small-scale terrain irregularities. The measurements of shear velocity in the field and those predicted by the FLOWSTAR model reflect observations of previous studies including the widely reported upwind reduction in shear velocity. Such a reduction in shear velocity upwind of the dune should result in a reduction in sand transport and sand deposition. This is not observed in the field. Wind tunnel modelling using a near-surface pulse-wire probe suggests that the field and FLOWSTAR methods of shear velocity derivation are inadequate. The wind tunnel results exhibit no reduction in shear velocity upwind of or at the toe of the dune. This maintenance of upwind shear stress may be caused by concave (unstable) streamline curvature, which is not taken into account by the field and FLOWSTAR techniques. From this hypothesis, a new model of dune dynamics is developed relying on the establishment of an equilibrium between windward slope morphology, streamline curvature and streamwise acceleration.
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Garrison, Courtney Rollins. "Repeatability of Aerodynamic Measurements of Voice." Miami University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=miami1239309229.

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Holmberg, Eva. "Aerodynamic measurements of normal voice." Doctoral thesis, Stockholms universitet, Institutionen för lingvistik, 1993. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-40215.

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Vocal fold vibration results from an alternating balance between subglottal air pressure that drives the vocal folds apart and muscular, elastic, and restoring forces that draw them together. The aim of the present thesis is to present quantitative data of normal vocal function using a noninvasive method. Measurements are made on the inverse filtered airflow waveform, of estimated average trans glottal pressure and glottal airflow, and of sound pressure for productions of syllable sequences. Statistical results are used to infer mechanisms that underlie differences across ( 1 ) normal, loud, and soft voice, (2) normal, high, and low pitch, and (3) between female and male voices. Interspeaker variation in group data and intra speaker variation across repeated recordings is also investigated. The results showed no significant female-male differences in pressure, suggesting that differences in other measures were not primarily due to differences in the respiratory systems . Most glottal waveforms showed a DC flow offset, suggesting an air leakage through a posterior glottal opening. Results suggested (indirectly) that the males in comparison with the females had significantly higher vocal fold closing velocities (maximum flow declination rate), larger vocal fold oscillations (AC flow), and relatively longer closed portions of the cycle (open quotient) in normal and loud voice. In soft voice, female and male waveforms were more alike. In comparison with normal voice, both females and males produced loud voice with significantly higher values of pressure, vocal fold closing velocity, and AC flow. Soft voice was produced with significantly lower values of these measures and increased DC flow. Correlation analyses indicated that several of the airflow measures were more directly related to vocal intensity than to pitch. Interspeaker variation was large, emphasizing the importance of large subject groups to capture normal variation. Intraspeaker variation across recording sessions was less than 2 standard deviations of the group means. The results should contribute to the understanding of normal voice function, and should be useful as norms in studies of voices disorders as well.
Härtill 5 uppsatser.För att köpa boken skicka en beställning till exp@ling.su.se/ To order the book send an e-mail to exp@ling.su.se
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Moat, Bengamin I. "Quantifying the effects of airflow distortion on anemometer wind speed measurements from merchant ships." Thesis, University of Southampton, 2003. https://eprints.soton.ac.uk/207/.

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Anemometers on Voluntary Observing Ships (VOS) are usually located above the bridge in a region where the effects of air flow distortion, created by the presence of the ship, may be large. Until now it was not known whether measurements from such anemometers would be biased high or low, and the possible magnitude of any such bias was not known. Investigations into the airflow above merchant ships have been carried out experimentally using a low-speed wind tunnel and numerically using a commercial Computational Fluid Dynamics (CFD) code VECTIS. The investigations examined the airflow over simple block models of VOS shapes. The results of the investigations were compared to wind speed measurements made from the RRS Charles Darwin. Experimental and CFD techniques have been used to devise scaling rules that predict the effects of the flow distortion. Both techniques have shown that the pattern of the flow distortion above the bridge scales with the ‘step height’, H, of the model. In the case of a tanker, H is the ‘bridge to deck’ height, i.e. the height of the accommodation block above the deck, for bow-on flows. Close to the top of the bridge the flow is severely decelerated and may even reverse in direction. Using the upwind edge of the bridge as the origin of the scaled co-ordinate system, there is a definite line above the decelerated region along which the speed of the flow is equal to the undistorted wind speed. Above this ‘line of equality’ the wind speed increases to a maximum and then decreases with increased height to a free stream wind speed. Simple equations have been devised to predict the positions of the ‘line of equality’, the maximum wind speed and the minimum wind speed within the decelerated region. Comparisons of the results with wind speed data obtained from field measurements made using a number of anemometers located on the RRS Charles Darwin agreed well and have predicted a maximum wind speed increase of approximately 15 ±5 %. Comparisons with the field data have confirmed that CFD models can be used to predict the effects of airflow distortion above merchant ships. The investigation has demonstrated the ability of the wind tunnel and CFD approaches employed to provide a better understanding of the airflow over merchant ships. Both methods have contributed to improve the understanding of how the wind speed at anemometer sites on merchant ships is affected by the ships hull and superstructure.
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Glover, N. "Investigating the impact of trees on airflow within street canyons through the use of CFD and field measurements." Thesis, University College London (University of London), 2015. http://discovery.ucl.ac.uk/1472912/.

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The local wind climate within the urban environment plays a key role in the removal of heat and pollutants from pedestrian occupied areas as well as having an impact on pedestrian comfort and safety. One component of the urban landscape which is often neglected in the consideration of airflow is tree planting which can constitute a major component of the built environment. The aim of this research was therefore to gain a greater understanding into the effect of tree planting on airflow within street canyons and investigate the use of CFD modelling in predicting such effects. This aim was accomplished through the use of CFD modelling and field measurements of tree-lined and non tree-lined streets. Tree canopies were represented within the CFD model by porous subdomains containing momentum and turbulence sinks. This simple representation was found to offer favourable comparison against field measurements and would therefore provide a simple and effective method for the inclusion of trees within CFD models of the urban environment. Results of both the CFD models and field measurements found reduced wind speeds at pedestrian level as well as a significant reduction in vertical wind speeds at roof level within the tree-lined street. There was also seen to be a significant reduction in turbulence levels within the street containing trees. Based on these findings it can be concluded that trees are likely to be a useful aid in urban design helping to reduce high wind speeds and turbulence thus creating outdoor environments which are comfortable and safe for pedestrian use. However the results also indicate that the addition of trees to streets can reduce the amount of air exchange at roof top level that occurs and thus may lead to a reduction in natural ventilation and potential build-up of pollutants within pedestrian occupied areas.
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Stephens, Arthur William, and arthur stephens esb ie. "Aerodynamic Cooling of Automotive Disc Brakes." RMIT University. Aerospace, Mechanical and Manufacturing Engineering, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20070108.121737.

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Sufficient heat dissipation is crucial to the effective operation of friction based braking systems. Such cooling is generally provided by ensuring a sufficient supply of cooling air to the heated components, hence the aerodynamics in the region of the brake components is extremely important. The objective of the research was to develop an understanding of how aerodynamics could be used to improve the cooling of automotive disc brakes. Two separate sets of wind tunnel experiments were developed. Tests were performed on a vented disc (rotor) to measure the internal flow through the vents on a rotating vented disc under various conditions, including an isolated disc in still air, the disc in still air with the wheel on, the disc in moving air with the wheel on, and an on-road simulation using a ¼ car. On vehicle tests were also performed in a wind tunnel using a purpose built brake test rig. These tests measured the thermal performance of different brake discs under various operating parameters; including constant load braking, and cooling from high temperature under various speeds, wheels and disc types. It was found that airflow through vented rotors was significantly reduced during simulated on-road driving, compared to when measured in isolation, but not particularly affected by the vehicles speed. In the situations tested, vented discs offered a 40+% improvement in cooling over an equivalent sized solid rotors. However the research indicates that the greatest benefit of vented rotors over solid will be in vehicles where air entering the wheel cavity is limited, such as low drag vehicles. It was also found that the most significant improvements in brake thermal performance could be achieved by maximising the airflow into the region of the brake components; including increasing the open area of the wheel, and increasing the vehicle velocity. Other improvements can be achieved by using a wheel material with good conductive capability, and increasing the mass of the disc. Evidence of vortex shedding was also discovered in the airflow at the exit of an internal vented rotor, any reduction in this flow disturbance should lead to increased airflow with associated improvements in thermal performance.
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Lapáček, Milan. "Čištění vzduchotechnických systémů a dosažitelné energetické úspory." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232143.

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The main aim of this thesis is to explore fouling of air ducts and its influence on energy consumption of HVAC systems. The first part focuses on typical parts that create the IAQ in buildings and on evaluating energy consumption of air transportation. The following section deals with the theories of fluid flow, flow regimes and pressure losses that are created as a side effect. The thesis outlines possible methods of assessing the impact of pollution with an emphasis on pressure losses and their influence on the fan power consumption. The actual experimental measurement, conducted in a selected industrial plant, is focused on an influence of cleanness of textile diffuser on HVAC device power consumption. For the further research of this process, measuring equipment with suitable measurement method is designed and constructed.
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Church, Sally Georgina. "On the measurement of airflow obstruction in conscious man." Thesis, King's College London (University of London), 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309143.

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Books on the topic "Airflow measurements"

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Roulet, Claude-Alain. Airflow patterns within buildings: Measurement techniques... Coventry: Air Infiltration and Ventilation Centre, 1991.

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C, Smith Steven. Airflow calibration of a bellmouth inlet for measurement of compressor airflow in turbine-powered propulsion simulators. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1985.

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Vinson, Robert P. Airflow evaluations of four-flow-controlled personal sampling pumps. Pittsburgh, Pa: U.S. Dept. of the Interior, Bureau of Mines, 1985.

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G, Williams J. Estimating engine airflow in gas-turbine powered aircraft with clean and distorted inlet flows. Edwards, Calif: National Aeronautics and Space Administration, Dryden Flight Research Center, 1996.

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Nagda, N. L. Air infiltration and interzonal airflow measurements in research houses. Electric Power Research Institute, 1988.

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Standard Methods for Laboratory Airflow Measurement (Ashrae Standards, 41.2-1987). Amer Society of Heating, 1992.

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Roulet, Claude-Alain. Ventilation and Airflow in Buildings: Methods for Diagnosis and Evaluation. Taylor & Francis Group, 2016.

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Ventilation and Airflow in Buildings: Methods for Diagnosis and Evaluation (Buildings, Energy and Solar Technology Series). Earthscan Publications Ltd., 2008.

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Jeffrey, Andrew A. Wheeze. Edited by Patrick Davey and David Sprigings. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780199568741.003.0017.

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A wheeze is a high-pitched musical sound which reflects airflow obstruction. It may be monophonic or polyphonic, and may be heard during inspiration, expiration, or both phases of respiration. Stridor is the term used to describe wheeze which is louder over the neck than the chest, and may be audible without a stethoscope. Wheezing is typically associated with breathlessness, and may present as an acute or chronic problem. It is most often due to asthma or chronic obstructive pulmonary disease. In stable patients, a detailed history should be taken, with particular attention to the speed of onset of wheeze; trigger factors; and history of atopy. The clinical features, measurement of peak expiratory flow, and spirometry will usually differentiate between possible diagnoses. This chapter describes the approach to the diagnosis of patients with wheeze.
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Book chapters on the topic "Airflow measurements"

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Chapain, P., A. Johnson, J. Vossoughi, and S. Majd. "Respiratory Resistance Measurements during Exercise Using the Airflow Perturbation Device." In IFMBE Proceedings, 247–50. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-14998-6_63.

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Kaga, Akikazu, Yoshio Inoue, and Katsuhito Yamaguchi. "Application of a Fast Algorithm for Pattern Tracking on Airflow Measurements." In Flow Visualization VI, 853–57. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-84824-7_153.

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Ezzeddine, W., J. Schutz, and N. Rezg. "Pitot sensor airflow measurement accuracy." In Risk, Reliability and Safety: Innovating Theory and Practice, 1401–5. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315374987-210.

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Brellochs, F., M. Fertig, J. Algermissen, and D. Brüggemann. "Optical Measurements of Hydrogen Mixing in Supersonic Airflows." In Fluid Mechanics and Its Applications, 71–79. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5432-1_6.

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Shen, Chen, Junjie Liu, Wei Wang, and Nan Jiang. "Experimental Measurement of Airflow Turbulence Characteristics in a Full-Size Aircraft Cabin." In Lecture Notes in Electrical Engineering, 341–49. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-39581-9_35.

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Markov, A. "Model of Airflow Process Through Throttling Sections of Automated Deadweight Absolute Pressure Measurement System." In Lecture Notes in Mechanical Engineering, 1335–47. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-22063-1_141.

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Cao, Xiaodong, Junjie Liu, and Nan Jiang. "An Overview of the Applications of Particle Image Velocimetry for Indoor Airflow Field Measurement." In Lecture Notes in Electrical Engineering, 223–31. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-39578-9_24.

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Besse, L., G. Gottschalk, A. Moser, and P. Suter. "Measurement of the Spatial, Stationary and Time Variable Velocity Distribution of Airflow Using Tracer Particles and Still Video Techniques." In Flow Visualization VI, 223–27. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-84824-7_36.

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Kinnear, William J. M., and James H. Hull. "Additional respiratory measurements." In A Practical Guide to the Interpretation of Cardiopulmonary Exercise Tests, edited by William J. M. Kinnear and James H. Hull, 102–6. Oxford University Press, 2021. http://dx.doi.org/10.1093/med/9780198834397.003.0015.

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This chapter describes how additional information can be obtained during an exercise test to detect the airflow obstruction of exercise-induced asthma. The forced expiratory volume in one second (FEV1) may fall a few minutes after cessation of exercise, but this test is not particularly sensitive for detecting exercise-induced bronchoconstriction. The flow–volume loop during exercise can be compared with the pre-test maximal trace to detect expiratory airflow limitation. Addition of inspiratory capacity measurements can be helpful. The flow–volume loop may also suggest exercise-induced laryngeal obstruction, which can be confirmed by continuous fibreoptic laryngoscopy during exercise.
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Fox, Robert D., and Richard C. Derksen. "Airflow Measurement." In Encyclopedia of Agricultural, Food, and Biological Engineering, Second Edition, 34–37. CRC Press, 2010. http://dx.doi.org/10.1081/e-eafe2-120006897.

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Conference papers on the topic "Airflow measurements"

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Li, Lifu, and Fan Fan. "Self diagnosis for hot film airflow mass microsensors." In Fourth International Symposium on Precision Mechanical Measurements, edited by Yetai Fei, Kuang-Chao Fan, and Rongsheng Lu. SPIE, 2008. http://dx.doi.org/10.1117/12.819585.

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C. Vigneault, N.R. Markarian, B. Goyette, and L.R. de Castro. "Indirect Airflow Distribution Measurements in Horticultural Crop Packages." In 2004, Ottawa, Canada August 1 - 4, 2004. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2004. http://dx.doi.org/10.13031/2013.17707.

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Ikegawa, Masato, Hiroshi Mukai, Taisuke Sugii, and Masatoshi Watanabe. "Investigation of Polygonal Airflow Structure in Hard Disk Drives With and Without Spoiler by Using Fluid Simulations and Measurements." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-62408.

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The polygonal airflow patterns between disks in hard disk drives (HDDs) were investigated by using fluid simulations and pressure measurements. These patterns were found from the radial velocity distributions of airflows on the mid-plane between disks. Several peaks of pressure increases caused by rotating polygonal-airflow patterns with several modes were measured with a pressure sensor placed on the tip of the carriage arm and spoiler. Several modes of polygonal patterns were observed at the outer diameter (OD) and the middle diameter (MD) arm positions, but not at the inner diameter (ID) arm position. These peaks on the arm were weakened by the spoiler.
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Flammini, A., D. Marioli, E. Sardini, and M. Serpelloni. "An autonomous sensor with energy harvesting capability for airflow speed measurements." In 2010 IEEE Instrumentation & Measurement Technology Conference Proceedings. IEEE, 2010. http://dx.doi.org/10.1109/imtc.2010.5488264.

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Chouinard, E., F. Hamady, and H. Schock. "Airflow Visualization and LDV Measurements in a Motored Rotary Engine Assembly Part 2: LDV Measurements." In International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1990. http://dx.doi.org/10.4271/900031.

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Deslandes, Willy, Patrick Dumont, Alain Dupont, Xavier Baby, Georges Charnay, and Jacques Boree. "Airflow Cyclic Variations Analysis in Diesel Combustion Chamber by PIV Measurements." In SAE 2004 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2004. http://dx.doi.org/10.4271/2004-01-1410.

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Janssen, L., N. Anderson, R. Weber, P. Cassidy, and T. Nelson. "46. Interpretation of Inhalation Airflow Measurements for Respirator Design and Testing." In AIHce 2006. AIHA, 2006. http://dx.doi.org/10.3320/1.2753437.

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Souifi, Jihen, Yassine Bouslimani, Mohsen Ghribi, and Azeddine Kaddouri. "LoRaWAN-WiFi device semiconductor technology-based for airflow measurements in HVAC systems." In 2021 IEEE International Conference on Industry 4.0, Artificial Intelligence, and Communications Technology (IAICT). IEEE, 2021. http://dx.doi.org/10.1109/iaict52856.2021.9532528.

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Gorse, Ph, K. Willenborg, S. Busam, J. Ebner, K. Dullenkopf, and S. Wittig. "3D-LDA Measurements in an Aero-Engine Bearing Chamber." In ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/gt2003-38376.

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For future efficient and light aero-engines it is essential to develop optimized lubrication systems. These systems require increased temperature and pressure levels in combination with high rotational speeds without compromising the high level of safety and reliability. This applies especially to the bearing chamber as one of the most challenging components of the oil system. Due to the mixing of the sealing airflow and the lubrication oil a complex air- / oilflow is formed inside the chamber. In order to gain a deeper insight into the physical phenomena of the flow inside the bearing chamber a multiyear fundamental study has been initiated. This study focuses for the first time on detailed measurements of the local air- / oilflow field. In the first phase of the project experiments have been carried out to determine the rotating and swirling pure airflow. Hence a specially adapted three dimensional Laser Doppler Anemometry (LDA) system was used to resolve the complex flow. The results revealed that different flow patterns occurred depending on the ratio between the shaft speed and the airflow rate. In the near future it is aimed to resolve the droplet flow also to provide a complete knowledge of the air- / oilflow in bearing chambers.
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Junior, Rui, Wendel Chaves, Yung Lin, Pedro Silva, José Vitor Freitas da SIlva, and Danielle R. S. Guerra. "ESTABLISHMENT OF AN EXPERIMENTAL FACILITY AND VELOCITY MEASUREMENTS OF AIRFLOW OVER POROUS BED." In 25th International Congress of Mechanical Engineering. ABCM, 2019. http://dx.doi.org/10.26678/abcm.cobem2019.cob2019-0902.

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Reports on the topic "Airflow measurements"

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Hardcastle, S. G., M G Grenier, and K. C. Butler. Electronic anemometry - recommended instruments and methods for routine mine airflow measurements. Natural Resources Canada/CMSS/Information Management, 1993. http://dx.doi.org/10.4095/328717.

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Biermayer, Peter J., James Lutz, and Alex Lekov. Measurement of airflow in residential furnaces. Office of Scientific and Technical Information (OSTI), January 2004. http://dx.doi.org/10.2172/826106.

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Fisk, William J., David Faulkner, Douglas P. Sullivan, and Woody Delp. Outdoor airflow into HVAC systems: An evaluation of measurement technologies. Office of Scientific and Technical Information (OSTI), September 2003. http://dx.doi.org/10.2172/817252.

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Fisk, William J., Douglas P. Sullivan, and David Faulkner. Real-Time Measurement of Rates of Outdoor Airflow into HVACSystems: A Field Study of Three Technologies. Office of Scientific and Technical Information (OSTI), September 2005. http://dx.doi.org/10.2172/925417.

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Fisk, William J., David Faulkner, and Douglas P. Sullivan. An evaluation of technologies for real-time measurement of rates of outdoor airflow into HVAC systems. Office of Scientific and Technical Information (OSTI), September 2004. http://dx.doi.org/10.2172/838253.

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Klinowski, G. W., and A. W. Stokes. Field measurement of airflows induced through hollow shaft venturis on double ended ranging drum shearers in the Sydney Coalfield. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/304777.

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