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A Novel Approach for Measurement of Peak Expiratory Velocity
It is well known that behind the orifice in a pipe, flow velocity increases and pressure decreases simultaneously. The generated sound appears that is caused by the pressure fluctuations that occur as the flow passes through the orifice. Then the flow velocity is averaged over a pipe cross-section a...
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Published in: | Journal of Applied Fluid Mechanics 2017-01, Vol.10 (1), p.379-387 |
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description | It is well known that behind the orifice in a pipe, flow velocity increases and pressure decreases simultaneously. The generated sound appears that is caused by the pressure fluctuations that occur as the flow passes through the orifice. Then the flow velocity is averaged over a pipe cross-section and is considered as a constant, it can be seen that the amplitude of sound increases with increases in the expiratory velocity. An experimental study of the quantitative analysis of sound pressure level correlated with expiratory velocity in a pipe was conducted using an apparatus that includes an air pump in conjunction with a pipe, a microphone, and an orifice plate, among other instruments. The regression and analysis of the results shows that the pressure fluctuation of sound spectra can be correlated to the expiratory velocity of a pipe. The experiment is conducted under conditions where the air passing through the orifice has an averaged expiratory velocity ranging from 0.88 m/sec to 1.35 m/sec, an inlet temperature of 298.15 K, and where the outlet pressure is that of the atmosphere. In this experiment, the Mach number is very low, and the compressibility effects can be ignored. The obstacle orifice plate was placed in the center of the pipe, and a microphone was mounted flush downstream to acquire the sound pressure data on the pipe wall. The measured results show that the approach for measuring the expiratory velocity using a microphone can be justified, and there exists a good correlation between the Power Spectral Density (PSD) of sound pressure fluctuation and the peak expiratory velocity. |
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The generated sound appears that is caused by the pressure fluctuations that occur as the flow passes through the orifice. Then the flow velocity is averaged over a pipe cross-section and is considered as a constant, it can be seen that the amplitude of sound increases with increases in the expiratory velocity. An experimental study of the quantitative analysis of sound pressure level correlated with expiratory velocity in a pipe was conducted using an apparatus that includes an air pump in conjunction with a pipe, a microphone, and an orifice plate, among other instruments. The regression and analysis of the results shows that the pressure fluctuation of sound spectra can be correlated to the expiratory velocity of a pipe. The experiment is conducted under conditions where the air passing through the orifice has an averaged expiratory velocity ranging from 0.88 m/sec to 1.35 m/sec, an inlet temperature of 298.15 K, and where the outlet pressure is that of the atmosphere. In this experiment, the Mach number is very low, and the compressibility effects can be ignored. The obstacle orifice plate was placed in the center of the pipe, and a microphone was mounted flush downstream to acquire the sound pressure data on the pipe wall. The measured results show that the approach for measuring the expiratory velocity using a microphone can be justified, and there exists a good correlation between the Power Spectral Density (PSD) of sound pressure fluctuation and the peak expiratory velocity.</description><identifier>ISSN: 1735-3572</identifier><identifier>EISSN: 1735-3645</identifier><identifier>DOI: 10.18869/acadpub.jafm.73.238.25515</identifier><language>eng</language><publisher>Isfahan: Isfahan University of Technology</publisher><subject>Compressibility ; Compressibility effects ; Correlation analysis ; Flow velocity ; Fluctuation ; Inlet temperature ; Mach number ; Measuring instruments ; Microphones ; Orifice meters ; Orifices ; Peak expiratory velocity; Wall-pressure spectra; pipe flow; PSD ; Pipe ; Pipes ; Power spectral density ; Pressure ; Regression analysis ; Sound ; Sound pressure ; Spectra</subject><ispartof>Journal of Applied Fluid Mechanics, 2017-01, Vol.10 (1), p.379-387</ispartof><rights>2017. This work is published under http://creativecommons.org/licenses/by-nc-nd/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.proquest.com/docview/2477277421?pq-origsite=primo$$EHTML$$P50$$Gproquest$$Hfree_for_read</linktohtml><link.rule.ids>314,780,784,25753,27924,27925,37012,37013,44590</link.rule.ids></links><search><creatorcontrib>Wu, Chung-Ching</creatorcontrib><creatorcontrib>Yu, Fan-Ming</creatorcontrib><creatorcontrib>NCKU</creatorcontrib><creatorcontrib>National Cheng Kung University</creatorcontrib><title>A Novel Approach for Measurement of Peak Expiratory Velocity</title><title>Journal of Applied Fluid Mechanics</title><description>It is well known that behind the orifice in a pipe, flow velocity increases and pressure decreases simultaneously. The generated sound appears that is caused by the pressure fluctuations that occur as the flow passes through the orifice. Then the flow velocity is averaged over a pipe cross-section and is considered as a constant, it can be seen that the amplitude of sound increases with increases in the expiratory velocity. An experimental study of the quantitative analysis of sound pressure level correlated with expiratory velocity in a pipe was conducted using an apparatus that includes an air pump in conjunction with a pipe, a microphone, and an orifice plate, among other instruments. The regression and analysis of the results shows that the pressure fluctuation of sound spectra can be correlated to the expiratory velocity of a pipe. The experiment is conducted under conditions where the air passing through the orifice has an averaged expiratory velocity ranging from 0.88 m/sec to 1.35 m/sec, an inlet temperature of 298.15 K, and where the outlet pressure is that of the atmosphere. In this experiment, the Mach number is very low, and the compressibility effects can be ignored. The obstacle orifice plate was placed in the center of the pipe, and a microphone was mounted flush downstream to acquire the sound pressure data on the pipe wall. The measured results show that the approach for measuring the expiratory velocity using a microphone can be justified, and there exists a good correlation between the Power Spectral Density (PSD) of sound pressure fluctuation and the peak expiratory velocity.</description><subject>Compressibility</subject><subject>Compressibility effects</subject><subject>Correlation analysis</subject><subject>Flow velocity</subject><subject>Fluctuation</subject><subject>Inlet temperature</subject><subject>Mach number</subject><subject>Measuring instruments</subject><subject>Microphones</subject><subject>Orifice meters</subject><subject>Orifices</subject><subject>Peak expiratory velocity; Wall-pressure spectra; pipe flow; PSD</subject><subject>Pipe</subject><subject>Pipes</subject><subject>Power spectral density</subject><subject>Pressure</subject><subject>Regression analysis</subject><subject>Sound</subject><subject>Sound pressure</subject><subject>Spectra</subject><issn>1735-3572</issn><issn>1735-3645</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><sourceid>PIMPY</sourceid><sourceid>DOA</sourceid><recordid>eNqNkU1P3DAQhiPUSiDgP0T00suG-HPsqpcVAopECwfgak2cMc02u07tpOr--6a70ENPnGY0evRK8z5Fccbqihmj7Tl6bIepqVYY1hWIigtTcaWYOiiOGAi1EFqqd6-7An5YnObcNbWUIIUAe1R8Xpbf4i_qy-UwpIj-exliKr8S5inRmjZjGUN5T_ijvPw9dAnHmLblE_XRd-P2pHgfsM90-jKPi8ery4eLL4vbu-ubi-XtwktmxoXXniPjpCQLPlAAACXR1q0FDcFrxqhRxE3LubcBLQnrm7blirxBLVtxXNzsc9uIKzekbo1p6yJ2bneI6dlhGjvfk8PGWqVti4IzaUgjbzyRCELPjXkt56yP-6z53Z8T5dGtu-yp73FDccpublYypqwWb0ABTG2NNDP64T90Fae0mUtxXAJwAMnZTH3aUz7FnBOFf7-w2u2Uuhel7q9SB8LNSt1OqfgD1bmW8g</recordid><startdate>20170101</startdate><enddate>20170101</enddate><creator>Wu, Chung-Ching</creator><creator>Yu, Fan-Ming</creator><general>Isfahan University of Technology</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7QH</scope><scope>7TB</scope><scope>7U5</scope><scope>7UA</scope><scope>8FD</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>C1K</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>FR3</scope><scope>H8D</scope><scope>KR7</scope><scope>L7M</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>F1W</scope><scope>H96</scope><scope>L.G</scope><scope>DOA</scope></search><sort><creationdate>20170101</creationdate><title>A Novel Approach for Measurement of Peak Expiratory Velocity</title><author>Wu, Chung-Ching ; Yu, Fan-Ming</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c418t-c6c2a12e541fcfef77754a90d9767fc611eb5e28d22c9fa9e39cbdd25ec8a64d3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Compressibility</topic><topic>Compressibility effects</topic><topic>Correlation analysis</topic><topic>Flow velocity</topic><topic>Fluctuation</topic><topic>Inlet temperature</topic><topic>Mach number</topic><topic>Measuring instruments</topic><topic>Microphones</topic><topic>Orifice meters</topic><topic>Orifices</topic><topic>Peak expiratory velocity; Wall-pressure spectra; pipe flow; PSD</topic><topic>Pipe</topic><topic>Pipes</topic><topic>Power spectral density</topic><topic>Pressure</topic><topic>Regression analysis</topic><topic>Sound</topic><topic>Sound pressure</topic><topic>Spectra</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Wu, Chung-Ching</creatorcontrib><creatorcontrib>Yu, Fan-Ming</creatorcontrib><creatorcontrib>NCKU</creatorcontrib><creatorcontrib>National Cheng Kung University</creatorcontrib><collection>CrossRef</collection><collection>Aqualine</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Water Resources Abstracts</collection><collection>Technology Research Database</collection><collection>ProQuest Central (Alumni)</collection><collection>ProQuest Central</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Civil Engineering Abstracts</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Publicly Available Content Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>DOAJ Directory of Open Access Journals</collection><jtitle>Journal of Applied Fluid Mechanics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Wu, Chung-Ching</au><au>Yu, Fan-Ming</au><aucorp>NCKU</aucorp><aucorp>National Cheng Kung University</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A Novel Approach for Measurement of Peak Expiratory Velocity</atitle><jtitle>Journal of Applied Fluid Mechanics</jtitle><date>2017-01-01</date><risdate>2017</risdate><volume>10</volume><issue>1</issue><spage>379</spage><epage>387</epage><pages>379-387</pages><issn>1735-3572</issn><eissn>1735-3645</eissn><abstract>It is well known that behind the orifice in a pipe, flow velocity increases and pressure decreases simultaneously. The generated sound appears that is caused by the pressure fluctuations that occur as the flow passes through the orifice. Then the flow velocity is averaged over a pipe cross-section and is considered as a constant, it can be seen that the amplitude of sound increases with increases in the expiratory velocity. An experimental study of the quantitative analysis of sound pressure level correlated with expiratory velocity in a pipe was conducted using an apparatus that includes an air pump in conjunction with a pipe, a microphone, and an orifice plate, among other instruments. The regression and analysis of the results shows that the pressure fluctuation of sound spectra can be correlated to the expiratory velocity of a pipe. The experiment is conducted under conditions where the air passing through the orifice has an averaged expiratory velocity ranging from 0.88 m/sec to 1.35 m/sec, an inlet temperature of 298.15 K, and where the outlet pressure is that of the atmosphere. In this experiment, the Mach number is very low, and the compressibility effects can be ignored. The obstacle orifice plate was placed in the center of the pipe, and a microphone was mounted flush downstream to acquire the sound pressure data on the pipe wall. The measured results show that the approach for measuring the expiratory velocity using a microphone can be justified, and there exists a good correlation between the Power Spectral Density (PSD) of sound pressure fluctuation and the peak expiratory velocity.</abstract><cop>Isfahan</cop><pub>Isfahan University of Technology</pub><doi>10.18869/acadpub.jafm.73.238.25515</doi><tpages>9</tpages><oa>free_for_read</oa></addata></record> |
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subjects | Compressibility Compressibility effects Correlation analysis Flow velocity Fluctuation Inlet temperature Mach number Measuring instruments Microphones Orifice meters Orifices Peak expiratory velocity Wall-pressure spectra pipe flow PSD Pipe Pipes Power spectral density Pressure Regression analysis Sound Sound pressure Spectra |
title | A Novel Approach for Measurement of Peak Expiratory Velocity |
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