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Academic literature on the topic 'Airflow patterns'

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Published: 4 June 2021
Last updated: 10 February 2022

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Journal articles on the topic "Airflow patterns"

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Hutchison, A. A., J. A. Wozniak, H. G. Choi, M. Conlon, R. A. Otto, R. M. Abrams, and P. C. Kosch. "Laryngeal and diaphragmatic muscle activities and airflow patterns after birth in premature lambs." Journal of Applied Physiology 75, no. 1 (July 1, 1993): 121–31. http://dx.doi.org/10.1152/jappl.1993.75.1.121.

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The nature and control of early neonatal respiratory patterns were determined in 10 premature, asphyxiated lambs. Severe retardation of early expiratory airflow (braking) characterized an initial pattern (A), but was absent in a final one (B). During a transition pattern (pattern T), pattern A and B airflow types occurred. Close temporal relationships between the airflow patterns and posterior cricoarytenoid (PCA), thyroarytenoid (TA), and diaphragm (D) integrated muscle activities were demonstrated quantitatively. Specifically, in pattern A, the duration of braked expiratory airflow was related to the durations of TA burst activity and the absence of PCA burst activity (r2 = 0.99). In pattern A, pH, but not arterial PCO2 or arterial PO2, differed from that in patterns T and B [7.01 +/- 0.14 (A), 7.11 +/- 0.12 (T), 7.19 +/- 0.08 (B) (P < 0.03)]. Within-breath airflow and respiratory muscle activity relationships and differences in neural and mechanical respiratory timing intervals between patterns suggested that neural feedback was important in the control of central pattern generation. Thus activities of PCA, TA, and D shape the early neonatal airflow patterns and are influenced mainly by neuromechanical, and not chemical, feedback.
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Huang, Hanyao, Heng Yin, Yang Wang, Nan Chen, Dantong Huang, Xiangyou Luo, Xing Yin, Qian Zheng, Bing Shi, and Jingtao Li. "Computational Fluid Dynamic Analysis of Different Velopharyngeal Closure Patterns." Annals of Otology, Rhinology & Laryngology 129, no. 2 (September 30, 2019): 157–63. http://dx.doi.org/10.1177/0003489419879176.

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Objective: Velopharyngeal (VP) closure has high impact on the quality of life, especially in patients with cleft palate. For better understanding the VP closure, it is important to understand the airflow dynamics of different closure patterns, including circular, coronal, sagittal, and circular with a Passavant’s ridge. The purpose of this study was to demonstrate the airflow characteristics of different velopharyngeal closure patterns. Methods: Sixteen adults with no notable upper airway abnormality who needed multislice spiral computed tomography scans as part of their clinical care. Airways were reconstructed. A cylinder and a cuboid were used to replace the VP port in three models of VP port patterns. Flow simulations were carried using computational fluid dynamics. Airflow pressures in the VP orifice, oral cavity and nasal cavity, as well as airflow velocity through the velopharyngeal orifice, were calculated. Results: The airflow dynamics at the velopharynx were different among different velopharyngeal patterns as the area of the velopharyngeal port increased from 0 to 25 mm2. The orifice areas of different closure conditions in four velopharyngeal closure patterns were significantly different. The maximal orifice area for adequate velopharyngeal closure was 7.57 mm2 in the coronal pattern and 6.21 mm2 in the sagittal pattern. Conclusions: Airflow dynamics of the velopharynx were correlated to the velopharyngeal closure patterns. Different closure patterns had different largest permitted orifice areas for getting the appropriate oral pressures for normal speech.
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Alipour, Fariborz, and Douglas Montequin. "Airflow patterns in hemilarynx models." Journal of the Acoustical Society of America 108, no. 5 (November 2000): 2530. http://dx.doi.org/10.1121/1.4743365.

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Li, Hancao, and Wassim M. Haddad. "Optimal Determination of Respiratory Airflow Patterns Using a Nonlinear Multicompartment Model for a Lung Mechanics System." Computational and Mathematical Methods in Medicine 2012 (2012): 1–11. http://dx.doi.org/10.1155/2012/165946.

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We develop optimal respiratory airflow patterns using a nonlinear multicompartment model for a lung mechanics system. Specifically, we use classical calculus of variations minimization techniques to derive an optimal airflow pattern for inspiratory and expiratory breathing cycles. The physiological interpretation of the optimality criteria used involves the minimization of work of breathing and lung volume acceleration for the inspiratory phase, and the minimization of the elastic potential energy and rapid airflow rate changes for the expiratory phase. Finally, we numerically integrate the resulting nonlinear two-point boundary value problems to determine the optimal airflow patterns over the inspiratory and expiratory breathing cycles.
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Mennella, Julie A., and Gary K. Beauchamp. "Developmental Changes in Nasal Airflow Patterns." Acta Oto-Laryngologica 112, no. 6 (January 1992): 1025–31. http://dx.doi.org/10.3109/00016489209137505.

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Xing, Jin Cheng, Yun Ping Wang, Ji Hong Ling, Yong Pan Li, and Yun Zhe Ji. "The Effect of Airflow Patterns on the Purification Efficiency of the Operating Room." Advanced Materials Research 340 (September 2011): 444–50. http://dx.doi.org/10.4028/www.scientific.net/amr.340.444.

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There are two unidirectional patterns in OR: horizontal unidirectional airflow and vertical unidirectional airflow. In order to compare their purification effect, computational fluid dynamics (CFD) was applied to simulate the two airflow patterns and the results are as following: Firstly, the number of the particles that hit the surgical key areas in the case of the horizontal unidirectional airflow is obviously less than that in the case of the vertical unidirectional airflow in the condition of the same air volume. Secondly, the number of the particles that hit the incisions will be satisfactory at a velocity of 0.25~0.3m/s in the case of the vertical unidirectional airflow while a velocity of 0.28~0.37m∕s in the case of the horizontal unidirectional airflow. Thirdly, the number of indoor residual particles in the case of the horizontal airflow is obviously less than that in the case of the vertical airflow in the case of the same air volume.
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Wang, Huan, Maohui Luo, Guijin Wang, and Xianting Li. "Airflow pattern induced by ceiling fan under different rotation speeds and blowing directions." Indoor and Built Environment 29, no. 10 (November 25, 2019): 1425–40. http://dx.doi.org/10.1177/1420326x19890054.

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Ceiling fans have been widely used as effective cooling and air mixing method for building environment conditioning. Understanding its airflow characteristics can be helpful to utilize ceiling fan or integrate it with background air conditioning system. However, the airflow induced by ceiling fan has different flow patterns under different rotating speeds and blowing directions. To date, it is still challenging to capture those complicated airflow fields in room scale. In this study, the airflow pattern induced by a ceiling fan was measured with a new technology, quad-view colour sequence particle streak velocimetry. A series of isothermal experiments were conducted under five rotation speed levels with downward and upward blowing directions in a room-size (4 m × 2.5 m × 3 m) chamber. Based on comprehensive three-dimensional three-component vector measurement results, the average velocity, turbulence intensity and vorticity on the middle section were calculated and used to analyse airflow patterns induced by ceiling fan. The results show that the blowing direction of the fan determines the indoor airflow pattern. When blowing downward, the flow will cause high diversion between jet core under the fan blades and surrounding region. While for upward blowing, the air speed in lower part of the room is much lower but pretty uniform. The detailed measured airflow fields can serve as reference for ceiling fan design and operation.
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Walker, Ian J., and William G. Nickling. "Dynamics of secondary airflow and sediment transport over and in the lee of transverse dunes." Progress in Physical Geography: Earth and Environment 26, no. 1 (March 2002): 47–75. http://dx.doi.org/10.1191/0309133302pp325ra.

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Recent research literature on secondary airflow and sediment transport patterns over flow-transverse dunes is reviewed. Various issues surrounding the behaviour, modelling and sedimentological implications of near-surface airflow dynamics over dunes are discussed, including: the Law of the Wall; the Jackson and Hunt airflow model; the effects of streamline compression, acceleration and curvature on stoss slope shear stress; and, in particular, recent efforts to characterize secondary lee-side airflow patterns. A revised conceptual model of lee-side airflow is presented and areas for further research are identified regarding the implications of such patterns for dune sedimentary dynamics, morphology, and migration.
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Khoukhi, Maatouk. "Investigation of Airflow Patterns Inside Tall Building." Recent Patents on Engineering 3, no. 1 (January 1, 2009): 65–70. http://dx.doi.org/10.2174/187221209787259901.

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J. E. Chapman, R. Vance Moray, H. A. Cloud, and J. L. Nieber. "Airflow Patterns in Flat Storage Aeration Systems." Transactions of the ASAE 32, no. 4 (1989): 1368–73. http://dx.doi.org/10.13031/2013.31158.

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Dissertations / Theses on the topic "Airflow patterns"

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Odewole, Gboyega Akindeji. "Airflow patterns in ventilated wall cavities." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/airflow-patterns-in-ventilated-wall-cavities(f67d5b52-af96-4784-a1ac-6d6c3c41812e).html.

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Though heating, insulation, wall claddings and cavity-wall construction are considered as measures for remediating moisture and condensation in buildings, ventilation of wall cavities has however become a mantra among architects and other building professionals. Holes of any size and shape are made and located on building facades based on the accepted wisdom that a little air movement will keep the wall cavities dry. Whilst ventilation has been found to be successful in the control of moisture and condensation in rooms and larger enclosures, there is however insufficient understanding of how it works in thin spaces with high aspect ratios, such as the wall cavities studied in this thesis.In order to put in place good control and management practices in the remediation of moisture and condensation in vertical wall cavities by natural ventilation, it is vital to understand the dynamics of airflow in these cavities. In this thesis therefore, different size and shape of slots were employed to numerically investigate the effects of size, spacing and number of the slots on the characteristics of the velocity fields (patterns of airflow and distributions of velocity) in different cavity models. The Reynolds-Averaged-Navier-Stokes (RANS) methodology was employed to simulate the cavity flows under different modelling conditions using FLUENT. The BS 5925 model, an empirical relation for predicting ventilation rates in rooms and other larger enclosures, was employed and modified to predict ventilation rates in these cavities. Experimentally, the mapping of the airstreams in these cavities was obtained under similar reference (inlet) wind speeds employed for the numerical investigations.The results of this study show that there exists a potential at higher wind speeds for natural ventilation in the remediation of moisture and condensation in the cavities of vertical walls. The steady state approach employed in the RANS-based computation of cavity flows in this thesis averages out the peak values of air velocities and therefore gives no information about regions of maxima or minima velocity values even at higher wind speeds. This makes the predicted air change rates insensitive to the inlet air velocities from the ventilation slots and therefore makes the results more applicable for long term control and management of moisture in these cavities. In order to therefore put in place short, medium and long term plans for remediation of moisture in these wall cavities, a time-dependent computation is required. This will also allow the efficiency of the cavity ventilation to be properly assessed. Using the modified BS 5925 model, reasonable predictions were obtained for the air change rates of the wall cavities with the different size of ventilation slots employed. Close agreements are also obtained at lower and higher wind speeds between the predicted ventilation rates from the modified BS 5925 model and the experimental results employed as benchmark for validating the results.
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Moloney, Kenneth W. "An analysis of airflow patterns in auxiliary ventilated drivages." Thesis, University of Nottingham, 1997. http://eprints.nottingham.ac.uk/12364/.

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In recent years the drivage advance rates achieved within the UK coal industry have increased. In the 1980's average drivage rates were 35m per week compared to the 100/150m per week possible today. These extended rates of advance have resulted in an increase in the potential methane, dust and heat generation within the vicinity of the drivage face. In order to effectively disperse this additional pollutant load a controlled increase in air quantity is required. Although advance rates have changed, current auxiliary ventilation practice has not. UK mining law requires that the fresh air must be delivered to within 5m of the face. This has lead to the wide spread adoption of the use of overlap auxiliary systems within mechanised drivages, since a pure forcing system set at this distance from the face would lead to excessive airborne dust. UK mining law does not at present consider on-board mounted exhaust scrubber fans to constitute an effective overlap fan within mechanised drivages. Consequently an additional overlap exhaust fan is required to be installed within such drivages. In an attempt to determine whether working conditions could be safely and economically improved within mechanised rapid development drivages utilising an on-board mounted exhaust fan, a series of preliminary full scale gallery trials were conducted. A summary of the principal findings of these trials is presented together with an outline of a series of representative CFD simulations. This thesis examines the accuracy of CFD simulations for auxiliary ventilated headings. This is achieved by utilising Laser Doppler Anenometry (LDA) in a scale model representative of an underground heading and a detailed underground measurement programme conducted in production headings. These measured airflow values are then compared with representative CFD simulations and conclusions
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Landolt, Scott David. "An analysis of airflow patterns inside precipitation gauge shielding." Connect to online resource, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1453573.

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Watkin, Sara Louise. "Cerebral haemodynamic effects of pauses in nasal airflow defined using near infrared spectroscopy." Thesis, Keele University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319025.

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Mayes, Julian C. "Regional airflow patterns in the British Isles and their influence on rainfall fluctuations." Thesis, Swansea University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260186.

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Cain, Melissa 1982. "Analysis of buoyancy driven airflow patterns in a model of a naturally ventilated building." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/32797.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2004.
Includes bibliographical references (leaf 22).
Models can help us understand the climate conditions inside naturally ventilated buildings in order to improve the efficiency of the design. Naturally ventilated buildings use temperature gradients to create buoyancy forces in the space and drive the airflow pathways in the space. One architectural design feature that facilitates natural ventilation is the presence of stack ventilation in the roof of the building, which facilitates the expulsion of heated air from the space. An architectural feature that changes the airflow pathways is the presence of railing on the upper floors where there is a danger of falling into the atrium. Using the model of a naturally ventilated building located in the Building Technology Department at MIT airflow visualization studies were carried out using incense to view the airflow patterns in the model. The variables of temperature, size of stack ventilation opening, and whether there were railings in the building or not were varied to determine their effects on the airflow. Temperature had the effect of increasing the velocity of the airflow, but did not significantly change the overall airflow profile. The size of the stack vent opening changed the airflow pathways significantly as did adding railings into the model. Comparing the results with a computational fluid dynamics model shows that there are some discrepancies.
by Melissa Cain.
S.B.
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Detaranto, Michael Francis. "CFD analysis of airflow patterns and heat transfer in small, medium, and large structures." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/50813.

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Designing buildings to use energy more efficiently can lead to lower energy costs, while maintaining comfort for occupants. Computational fluid dynamics (CFD) can be utilized to visualize and simulate expected flows in buildings and structures. CFD gives architects and designers the ability to calculate the velocity, pressure, and heat transfer within a building. Previous research has not modeled natural ventilation situations that challenge common design rules of thumb used for cross-ventilation and single-sided ventilation. The current study uses a commercial code (FLUENT) to simulate cross-ventilation in simple structures and analyzes the flow patterns and heat transfer in the rooms. In the Casa Giuliana apartment and the Affleck house, this study simulates passive cooling in spaces well-designed for natural ventilation. Heat loads, human models, and electronics are included in the apartment to expand on prior research into natural ventilation in a full-scale building. Two different cases were simulated. The first had a volume flow rate similar to the ambient conditions, while the second had a much lower flow rate that had an ACH of 5, near the minimum recommended value Passive cooling in the Affleck house is simulated and has an unorthodox ventilation method; a window in the floor that opens to an exterior basement is opened along with windows and doors of the main floor to create a pressure difference. In the Affleck house, two different combinations of window and door openings are simulated to model different scenarios. Temperature contours, flow patterns, and the air changes per hour (ACH) are explored to analyze the ventilation of these structures.
Master of Science
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Kantipudi, Rohini. "Computational Fluid Dynamics Modeling Of Airflow patterns around a Room-and-pillar mining face area." Available to subscribers only, 2009. http://proquest.umi.com/pqdweb?did=1968005101&sid=21&Fmt=2&clientId=1509&RQT=309&VName=PQD.

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Md, Azmi Ahmad Zharif. "CFD ANALYSIS OF AIRFLOW PATTERNS IN HIGH MINING AREAS OF ROOM-AND-PILLAR COAL MINING." OpenSIUC, 2014. https://opensiuc.lib.siu.edu/theses/1574.

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This thesis studies airflow patterns in the face area of a typical room-and-pillar mining area, using Computational Fluid Dynamics (CFD) modeling. This research is designed to develop a scientific understanding of airflow distribution in room-and-pillar mining areas that is fundamental to developing engineering controls. The overall goal of the study is to develop improved engineering controls to minimize dust exposure of mine workers in the face area. Dust exposure can be a health hazard in underground coal mining industry based on historical data of coal workers' pneumoconiosis among underground mine workers. Current regulatory dust exposure standards of 1.5 mg/m3, averaged over an 8-hour period, have been recently revised with approval of new MSHA standards in April of 2014. Mining companies are currently seeking new technologies in order to comply with the new dust standards. Since mining geometries are complex and do not lend themselves to closed-form analytical solutions, CFD numerical modeling approach was used to develop an understanding of airflow distribution in the face areas. Since previous studies had focused on some cuts in mining heights of less than 2.4 m (8-ft), this study was performed for high mining areas of 4.2 m (14-ft). Such mining heights are very common in longwall mine development areas, particularly in the State of Illinois. The primary goal was to identify major differences in airflow between the two mining heights and how they affect development of engineering controls for minimizing dust exposure. Simulations were done using ANSYS software such as DesignModeler for modeling and meshing and FLUENT for calculations. Recirculation (RC) and low air velocity (LAV) zones were located for straight deep cut, straight deepest cut, cross-cut right, cross-cut right mine through, left turn cross-cut, and left turn cross-cut mine through for low mining height (LMH) and high mining height (HMH) with varying air quantity at the end of the line curtain (ELC). Air at the ELC was adjusted to achieve a ratio of 0.85, 1.00 and 1.15 over the wet scrubber fan (WSF) discharge capacity. Results show that the air velocity in HMH case is much lower than for the LMH. In addition, the location of RC and LAV zones differ based on mining height and air quantity at the ELC. Furthermore, lower air quantity at the ELC causes the air exhausted by the WSF to recirculate back to the face area in order to satisfy the WSF requirement. Recommendations to deal with these differences are formulated.
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Madden, Michael Levi. "The effects of passenger loading and ventilation air on airflow patterns within an aircraft cabin." Thesis, Kansas State University, 2015. http://hdl.handle.net/2097/19107.

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Master of Science
Department of Mechanical and Nuclear Engineering
Mohammad H. Hosni
Byron W. Jones
With the increasing number of passengers traveling on commercial aircraft, it is important to mitigate the possibility of diseases and contaminants spreading throughout aircraft cabins and becoming harmful to the health of passengers. The ventilation system on a Boeing 767 aircraft is designed to create lateral flow to isolate contaminants to a single row of the cabin and remove the harmful air quickly. There are many variables that can influence the airflow patterns inside the cabin. The thermal plumes created by occupants are one of the variables investigated in this experimentation. Another special case investigated is the transport of gases in the cabin when the ventilation air is eliminated. Experimentation is performed in a mock-up Boeing 767 cabin. The mock-up enclosure consists of 11 rows and 7 columns of seats in each row. Ventilation apparatus, seating, and cabin dimensions used for testing are all representative of an actual aircraft. Thermal manikins are placed in the cabin seats to simulate the heat load from a seated person. A mixture of carbon dioxide (CO²) and helium (He) is injected into the cabin as a tracer gas to simulate the release of contaminants. The CO² concentration is measured by analyzers placed at the cabin inlet, exhaust, and seat of interest. The tracer gas can be injected and sampled at any of the 77 seats. In order to determine the effects of passenger density, testing is performed with maximum occupant load and repeated with half of the passenger load. Tracer gas is injected in three locations of the cabin and sampled in 32 seats for each injection seat. The testing revealed a significant effect of passenger load on airflow patterns. To determine the effects of removing the ventilation air, the cabin is supplied with 1400 cfm of outdoor air at 60°F for three hours to bring the cabin to a steady state temperature. Then, the supply air is shut off, and tracer gas is injected into the cabin and the CO² concentration is sampled at 12 locations throughout the cabin. It was found that contaminants are still transported throughout the cabin without the ventilation air.
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Books on the topic "Airflow patterns"

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

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Book chapters on the topic "Airflow patterns"

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Raman, S., and C. Druzgalski. "Mathematical assessment of variability in respiratory airflow patterns." In IFMBE Proceedings, 974–77. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19387-8_237.

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Lv, Xiangxiang, Xiaoping Liu, Mei Wu, and Zhen Peng. "Comparison of Airflow and Pollutant Dispersion in Multi-room Buildings under Different Cross-Ventilation Patterns." In Environmental Science and Engineering, 1383–91. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-13-9520-8_142.

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Wang, Xiaoli, and Angui Li. "Experimental Investigation of Airflow Pattern of Fabric Air Dispersion System." In Lecture Notes in Electrical Engineering, 429–38. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-39581-9_43.

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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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Sá, Paula M., Neilson F. Dantas, Hermano A. Castro, Agnaldo J. Lopes, and Pedro L. Melo. "Airflow Pattern Complexity in Asbestos-Exposed Workers: Effect of Smoking and Diagnostic Accuracy." In XXVI Brazilian Congress on Biomedical Engineering, 737–43. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-2517-5_113.

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Shepherd, Gordon M. "The Pathway for Retronasal Airflow." In Neuroenology, 38–47. Columbia University Press, 2016. http://dx.doi.org/10.7312/columbia/9780231177009.003.0005.

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Breathing out produces its own complex retronasal airflow patterns in the nose. We show how humans are adapted for retronasal smell compared with the dog and other animals. The nose pinch test proves that much of flavor comes from retronasal smell. Research suggests that the flow path for retronasal smell is enhanced in humans. We discuss tips for wine tasting.
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Moureh, Jean. "Airflow Patterns within a Refrigerated Truck Loaded with Slotted, Filled Boxes." In Mathematical Modeling of Food Processing, 511–34. CRC Press, 2010. http://dx.doi.org/10.1201/9781420053548-22.

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Moureh, Jean. "Airflow Patterns within a Refrigerated Truck Loaded with Slotted, Filled Boxes." In Mathematical Modeling of Food Processing, 511–34. CRC Press, 2010. http://dx.doi.org/10.1201/9781420053548-c18.

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Kaditis, Athanasios. "Sleep Apnea in Children and the Upper Airway." In Asthma, 49–62. Oxford University Press, 2014. http://dx.doi.org/10.1093/med/9780199918065.003.0005.

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Obstructive sleep apnea (OSA) is the most severe form of “obstructive sleep-disordered breathing,” a spectrum of abnormal respiratory patterns during sleep characterized by snoring and increased respiratory effort due to increased upper airway resistance and pharyngeal collapsibility. Adenotonsillar hypertrophy and obesity are the most frequent causes of OSA in children. The clinical manifestations of OSA include apneas (cessation of oronasal airflow) and hypopneas (reduction of airflow), accompanied by arousals from sleep, restless sleep, daytime symptoms (sleepiness, inattention, hyperactivity), and academic difficulties. Cysteinyl leukotrienes contribute to the pathogenesis of both asthma and OSA in childhood. Cysteinyl leukotrienes have also been implicated in the pathogenesis of adenotonsillar hypertrophy. Preliminary evidence suggests that treatment of sleep apnea with adenotonsillectomy results in improved control of coexisting asthma.
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Taylor, C. "Effect of scrubber operation on airflow and methane patterns at the mining face." In 11th US/North American Mine Ventilation Symposium 2006, 393–99. Taylor & Francis, 2006. http://dx.doi.org/10.1201/9781439833391.ch55.

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Conference papers on the topic "Airflow patterns"

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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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Hsieh, Yue-Lin, Yi-Chern Hsieh, Zhao Han, and Hui-Fang Lin. "Airflow Patterns in the Airway Passage of Nasal Obstruction Patients." In 2018 IEEE International Conference on Advanced Manufacturing (ICAM). IEEE, 2018. http://dx.doi.org/10.1109/amcon.2018.8615052.

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Moura, Daniella Jorge, and Vilmar Rodrigues Sousa. "Simulation to improve temperature and airflow patterns in tunnel ventilation systems." In 10th International Livestock Environment Symposium (ILES X). St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2018. http://dx.doi.org/10.13031/iles.18-032.

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Maves, D., K. Wisniewski, and D. Brown. "457. A Method for Determining Airflow Patterns in Chemical Warfare Agent Bunkers." In AIHce 1996 - Health Care Industries Papers. AIHA, 1999. http://dx.doi.org/10.3320/1.2765143.

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Khalil, Essam E. "Flow Regimes and Heat Transfer Patterns in Archeological Climatized Church of Christ, Cairo." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-85088.

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Airflow characteristics in ventilated and air-conditioned spaces play an important role to attain comfort and hygiene conditions. This paper utilizes a 3D Computational Fluid Dynamics (CFD) model to assess the airflow characteristics in ventilated and air-conditioned archaeological Church of Christ (hanging Church) in Cairo, Egypt. It is found that the optimum airside design system can be attained, if the airflow is directed to pass all the enclosure areas before the extraction with careful selection of near wall velocities to avoid any wear or aberration of the wall paintings. Still all commonly known factors and evaluation indices have the shortage to describe the influence of the recirculation zones on the occupancy zone of the visitors and also on the fresh supplied air. The mode of evaluation should assess the airflow characteristics in any passage according to its position in the enclosure and the thermal pattern and air quality. The paper ends with brief discussion and concluding remarks.
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Shafik, Mahmoud, and Anne Lechevretel. "Computer Simulation and Modelling of Passive Humidification Device Cavity for Intensive Care Patient Medical Applications." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36505.

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This paper presents the research that has been undertaken into the passive humidification device cavity airflow structures and patterns. This was aiming to improve the device airflow, Heat and Moisture Exchange (HME) materials performance, for a greater patient care. However the objectives were to assist in understanding the optimal cavity structural geometries, generating improved airflow patterns over target HME material structures and consequently leading to improved heat and moisture exchange properties. Airflow studies of the device have been undertaken using the Computational Fluid Dynamics (CFD) interface of the ANSYS. The CFD package enables analysis of fluid flow and heat transfer. This paper presents the results of the CFD simulations carried out on different passive humidification device cavity designs and materials arrangements. An optimised design leading to enhanced airflow structures and patterns, heat and moisture properties of the device is also presented in this paper.
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Khalil, Essam E., Muhammed Hassan, Mohamed Rashad, and Ahmed ElDegwy. "CFD simulation Analyses of airflow Patterns around chillers in a mechanically ventilated room." In AIAA Scitech 2021 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2021. http://dx.doi.org/10.2514/6.2021-2034.

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Yang, R., C. Lungu, and G. Ramachandran. "45. Airflow Patterns around a Mannequin: Determination of Critical Parameters for Indoor Air Modeling." In AIHce 2004. AIHA, 2004. http://dx.doi.org/10.3320/1.2758431.

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Amusa, G. A., B. I. Awokola, G. Z. Shut, M. Akanbi, A. S. Sagay, and B. N. Okeahialam. "Airflow Limitation in Adults with Heart Failure: Prevalence, Patterns and Influence on Clinical Outcomes." In American Thoracic Society 2020 International Conference, May 15-20, 2020 - Philadelphia, PA. American Thoracic Society, 2020. http://dx.doi.org/10.1164/ajrccm-conference.2020.201.1_meetingabstracts.a3603.

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Tang, Miao, Jing Li, and Jingfeng Tang. "The dynamic characteristics of dielectric barrier discharge patterns under Karman vortex on atmospheric airflow." In 2021 IEEE 4th International Electrical and Energy Conference (CIEEC). IEEE, 2021. http://dx.doi.org/10.1109/cieec50170.2021.9510826.

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Reports on the topic "Airflow patterns"

1

Harrje, D. (Airflow patterns within buildings). Office of Scientific and Technical Information (OSTI), November 1989. http://dx.doi.org/10.2172/5452864.

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2

DEROSA, D. C. Evaluation of airflow patterns in 2706-T and 2706-TA. Office of Scientific and Technical Information (OSTI), August 1999. http://dx.doi.org/10.2172/797733.

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3

Fritz, Brad G., Fenton Khan, and Donaldo P. Mendoza. Evaluation of Airflow Patterns in the Transfer Area of the 105 KE Basin. Office of Scientific and Technical Information (OSTI), March 2003. http://dx.doi.org/10.2172/15010112.

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