A non-dimensional oscillation parameter describing interactive influence of oscillation frequency and velocity amplitude ratio for use in pulsatile flows
•The interactive influences of ω′ and A1 on Reta,crit and Reos,crit.•A new non-dimensional interactive oscillation number, Ios=ω′/A1.•Flow regime classification at onset of transition in pulsatile pipe flows by Ios=ω′/A1. The interactive influences of oscillation frequency and velocity amplitude rat...
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description | •The interactive influences of ω′ and A1 on Reta,crit and Reos,crit.•A new non-dimensional interactive oscillation number, Ios=ω′/A1.•Flow regime classification at onset of transition in pulsatile pipe flows by Ios=ω′/A1.
The interactive influences of oscillation frequency and velocity amplitude ratio on onset of transition in pulsatile pipe flow are investigated experimentally in the ranges of time-averaged and oscillating Reynolds numbers of 1019±35⩽Reta⩽4817±164 and 107±4⩽Reos⩽4261±145 with velocity amplitude ratio of 0.05±0.0017⩽A1⩽0.96±0.03 for 227 runs. Oscillation frequency is in the range of 0.1Hz⩽f⩽14Hz corresponding to Womersley number range of 2.72⩽ω′⩽32.21 covering quasi-steady, intermediate and beginning of inertia dominant regimes of pulsatile laminar flow.
The onset of transition in laminar pulsatile pipe flow can be retarded up to Reta,crit=4817 at ω′=3.85 in the covered experimental range. No more effect of A1 on Reta,crit is seen for ω′>8.61 although there is a considerable effect of A1 on Reos,crit. The effect of ω′ on Reta,crit and Reos,crit is not observed for A18.61. This shows that the time-periodicity (ω′, A1) does not affect significantly the onset of transition at the beginning of inertia dominant region of pulsatile laminar flow (ω′>8.61) when compared with their interactive effects in the quasi-steady and intermediate regions (ω′⩽8.61). For flow classification of pulsatile flow at the onset of transition, a new non-dimensional interactive oscillation number, Ios=ω′/A1 is proposed. According to this non-dimensional number, the pulsatile flow at the onset of transition can be subclassified such as quasi-steady for Ios30 considering the effects of both ω′ and A1 on contrary to the classifications available in the literature. |
doi_str_mv | 10.1016/j.measurement.2016.12.018 |
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The interactive influences of oscillation frequency and velocity amplitude ratio on onset of transition in pulsatile pipe flow are investigated experimentally in the ranges of time-averaged and oscillating Reynolds numbers of 1019±35⩽Reta⩽4817±164 and 107±4⩽Reos⩽4261±145 with velocity amplitude ratio of 0.05±0.0017⩽A1⩽0.96±0.03 for 227 runs. Oscillation frequency is in the range of 0.1Hz⩽f⩽14Hz corresponding to Womersley number range of 2.72⩽ω′⩽32.21 covering quasi-steady, intermediate and beginning of inertia dominant regimes of pulsatile laminar flow.
The onset of transition in laminar pulsatile pipe flow can be retarded up to Reta,crit=4817 at ω′=3.85 in the covered experimental range. No more effect of A1 on Reta,crit is seen for ω′>8.61 although there is a considerable effect of A1 on Reos,crit. The effect of ω′ on Reta,crit and Reos,crit is not observed for A1<0.30. The interactive influences of ω′ and A1 are also investigated on Reta,crit as functions of Reta,crit=Reta,crit (A1ω′) and Reta,crit=Reta,crit (ω′/A1). The interactive influences of ω′ and A1 are not seen on Reta,crit for ω′>8.61. This shows that the time-periodicity (ω′, A1) does not affect significantly the onset of transition at the beginning of inertia dominant region of pulsatile laminar flow (ω′>8.61) when compared with their interactive effects in the quasi-steady and intermediate regions (ω′⩽8.61). For flow classification of pulsatile flow at the onset of transition, a new non-dimensional interactive oscillation number, Ios=ω′/A1 is proposed. According to this non-dimensional number, the pulsatile flow at the onset of transition can be subclassified such as quasi-steady for Ios<5, intermediate for 5⩽Ios⩽30 and inertia dominant regions of pulsatile pipe flows for Ios>30 considering the effects of both ω′ and A1 on contrary to the classifications available in the literature.</description><identifier>ISSN: 0263-2241</identifier><identifier>EISSN: 1873-412X</identifier><identifier>DOI: 10.1016/j.measurement.2016.12.018</identifier><language>eng</language><publisher>London: Elsevier Ltd</publisher><subject>Amplitudes ; Dimensionless numbers ; Inertia ; Laminar flow ; Measurement ; Oscillating Reynolds number ; Periodic variations ; Pipe flow ; Pulsatile pipe flow ; Reynolds number ; Time-averaged Reynolds number ; Velocity ; Velocity amplitude ratio ; Womersley number</subject><ispartof>Measurement : journal of the International Measurement Confederation, 2017-03, Vol.99, p.36-43</ispartof><rights>2016 Elsevier Ltd</rights><rights>Copyright Elsevier Science Ltd. Mar 2017</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c349t-d9aeea93c5c784101c444f29577c77e6309e9953d3654da97861b9718cca18dc3</citedby><cites>FETCH-LOGICAL-c349t-d9aeea93c5c784101c444f29577c77e6309e9953d3654da97861b9718cca18dc3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.measurement.2016.12.018$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids></links><search><creatorcontrib>Özahi, Emrah</creatorcontrib><creatorcontrib>Çarpınlıoğlu, Melda Özdinç</creatorcontrib><title>A non-dimensional oscillation parameter describing interactive influence of oscillation frequency and velocity amplitude ratio for use in pulsatile flows</title><title>Measurement : journal of the International Measurement Confederation</title><description>•The interactive influences of ω′ and A1 on Reta,crit and Reos,crit.•A new non-dimensional interactive oscillation number, Ios=ω′/A1.•Flow regime classification at onset of transition in pulsatile pipe flows by Ios=ω′/A1.
The interactive influences of oscillation frequency and velocity amplitude ratio on onset of transition in pulsatile pipe flow are investigated experimentally in the ranges of time-averaged and oscillating Reynolds numbers of 1019±35⩽Reta⩽4817±164 and 107±4⩽Reos⩽4261±145 with velocity amplitude ratio of 0.05±0.0017⩽A1⩽0.96±0.03 for 227 runs. Oscillation frequency is in the range of 0.1Hz⩽f⩽14Hz corresponding to Womersley number range of 2.72⩽ω′⩽32.21 covering quasi-steady, intermediate and beginning of inertia dominant regimes of pulsatile laminar flow.
The onset of transition in laminar pulsatile pipe flow can be retarded up to Reta,crit=4817 at ω′=3.85 in the covered experimental range. No more effect of A1 on Reta,crit is seen for ω′>8.61 although there is a considerable effect of A1 on Reos,crit. The effect of ω′ on Reta,crit and Reos,crit is not observed for A1<0.30. The interactive influences of ω′ and A1 are also investigated on Reta,crit as functions of Reta,crit=Reta,crit (A1ω′) and Reta,crit=Reta,crit (ω′/A1). The interactive influences of ω′ and A1 are not seen on Reta,crit for ω′>8.61. This shows that the time-periodicity (ω′, A1) does not affect significantly the onset of transition at the beginning of inertia dominant region of pulsatile laminar flow (ω′>8.61) when compared with their interactive effects in the quasi-steady and intermediate regions (ω′⩽8.61). For flow classification of pulsatile flow at the onset of transition, a new non-dimensional interactive oscillation number, Ios=ω′/A1 is proposed. According to this non-dimensional number, the pulsatile flow at the onset of transition can be subclassified such as quasi-steady for Ios<5, intermediate for 5⩽Ios⩽30 and inertia dominant regions of pulsatile pipe flows for Ios>30 considering the effects of both ω′ and A1 on contrary to the classifications available in the literature.</description><subject>Amplitudes</subject><subject>Dimensionless numbers</subject><subject>Inertia</subject><subject>Laminar flow</subject><subject>Measurement</subject><subject>Oscillating Reynolds number</subject><subject>Periodic variations</subject><subject>Pipe flow</subject><subject>Pulsatile pipe flow</subject><subject>Reynolds number</subject><subject>Time-averaged Reynolds number</subject><subject>Velocity</subject><subject>Velocity amplitude ratio</subject><subject>Womersley number</subject><issn>0263-2241</issn><issn>1873-412X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNqNUclOBCEUJEYTx9F_wHjulqU3jmbilph40cQbQXhtmNBNC_QYP8W_lc540JsneEVV5VGF0DklJSW0udyWA6g4BxhgTCXLUElZSWh3gFa0a3lRUfZyiFaENbxgrKLH6CTGLSGk4aJZoa8rPPqxMDbro_WjcthHbZ1TKU94UkENkCBgA1EH-2rHN2zHDCid7A7yvXczjBqw7_8o-wDvy8MnVqPBO3Be25SHYXI2zQZwWHi49wHPcfHB0-xixhzg3vmPeIqOeuUinP2ca_R8c_20uSseHm_vN1cPheaVSIURCkAJrmvddlXORFdV1TNRt61uW2g4ESBEzQ1v6soo0XYNfRUt7bRWtDOar9HF3ncKPm8ck9z6OeQgomSkYZlaU55ZYs_SwccYoJdTsIMKn5ISuTQht_JXE3JpQlImcxNZu9lrIX9jZyHInNOSmbEBdJLG23-4fAPyx5zA</recordid><startdate>201703</startdate><enddate>201703</enddate><creator>Özahi, Emrah</creator><creator>Çarpınlıoğlu, Melda Özdinç</creator><general>Elsevier Ltd</general><general>Elsevier Science Ltd</general><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>201703</creationdate><title>A non-dimensional oscillation parameter describing interactive influence of oscillation frequency and velocity amplitude ratio for use in pulsatile flows</title><author>Özahi, Emrah ; Çarpınlıoğlu, Melda Özdinç</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c349t-d9aeea93c5c784101c444f29577c77e6309e9953d3654da97861b9718cca18dc3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Amplitudes</topic><topic>Dimensionless numbers</topic><topic>Inertia</topic><topic>Laminar flow</topic><topic>Measurement</topic><topic>Oscillating Reynolds number</topic><topic>Periodic variations</topic><topic>Pipe flow</topic><topic>Pulsatile pipe flow</topic><topic>Reynolds number</topic><topic>Time-averaged Reynolds number</topic><topic>Velocity</topic><topic>Velocity amplitude ratio</topic><topic>Womersley number</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Özahi, Emrah</creatorcontrib><creatorcontrib>Çarpınlıoğlu, Melda Özdinç</creatorcontrib><collection>CrossRef</collection><jtitle>Measurement : journal of the International Measurement Confederation</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Özahi, Emrah</au><au>Çarpınlıoğlu, Melda Özdinç</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A non-dimensional oscillation parameter describing interactive influence of oscillation frequency and velocity amplitude ratio for use in pulsatile flows</atitle><jtitle>Measurement : journal of the International Measurement Confederation</jtitle><date>2017-03</date><risdate>2017</risdate><volume>99</volume><spage>36</spage><epage>43</epage><pages>36-43</pages><issn>0263-2241</issn><eissn>1873-412X</eissn><abstract>•The interactive influences of ω′ and A1 on Reta,crit and Reos,crit.•A new non-dimensional interactive oscillation number, Ios=ω′/A1.•Flow regime classification at onset of transition in pulsatile pipe flows by Ios=ω′/A1.
The interactive influences of oscillation frequency and velocity amplitude ratio on onset of transition in pulsatile pipe flow are investigated experimentally in the ranges of time-averaged and oscillating Reynolds numbers of 1019±35⩽Reta⩽4817±164 and 107±4⩽Reos⩽4261±145 with velocity amplitude ratio of 0.05±0.0017⩽A1⩽0.96±0.03 for 227 runs. Oscillation frequency is in the range of 0.1Hz⩽f⩽14Hz corresponding to Womersley number range of 2.72⩽ω′⩽32.21 covering quasi-steady, intermediate and beginning of inertia dominant regimes of pulsatile laminar flow.
The onset of transition in laminar pulsatile pipe flow can be retarded up to Reta,crit=4817 at ω′=3.85 in the covered experimental range. No more effect of A1 on Reta,crit is seen for ω′>8.61 although there is a considerable effect of A1 on Reos,crit. The effect of ω′ on Reta,crit and Reos,crit is not observed for A1<0.30. The interactive influences of ω′ and A1 are also investigated on Reta,crit as functions of Reta,crit=Reta,crit (A1ω′) and Reta,crit=Reta,crit (ω′/A1). The interactive influences of ω′ and A1 are not seen on Reta,crit for ω′>8.61. This shows that the time-periodicity (ω′, A1) does not affect significantly the onset of transition at the beginning of inertia dominant region of pulsatile laminar flow (ω′>8.61) when compared with their interactive effects in the quasi-steady and intermediate regions (ω′⩽8.61). For flow classification of pulsatile flow at the onset of transition, a new non-dimensional interactive oscillation number, Ios=ω′/A1 is proposed. According to this non-dimensional number, the pulsatile flow at the onset of transition can be subclassified such as quasi-steady for Ios<5, intermediate for 5⩽Ios⩽30 and inertia dominant regions of pulsatile pipe flows for Ios>30 considering the effects of both ω′ and A1 on contrary to the classifications available in the literature.</abstract><cop>London</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.measurement.2016.12.018</doi><tpages>8</tpages></addata></record> |
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subjects | Amplitudes Dimensionless numbers Inertia Laminar flow Measurement Oscillating Reynolds number Periodic variations Pipe flow Pulsatile pipe flow Reynolds number Time-averaged Reynolds number Velocity Velocity amplitude ratio Womersley number |
title | A non-dimensional oscillation parameter describing interactive influence of oscillation frequency and velocity amplitude ratio for use in pulsatile flows |
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