Dynamic Analysis of Airflow in Air-Jet Filling Insertion: Part II — Air Velocity Measurements

2002 ◽  
Author(s):  
Sabit Adanur ◽  
Sayavur I. Bakhtiyarov ◽  
Tacibaht Turel
Keyword(s):  
Dynamic Analysis ◽  
Air Flow ◽  
Flow Characteristics ◽  
Experimental System ◽  
Velocity Measurements ◽  
Air Velocity ◽  
Auburn University ◽  
Air Jet

Air-jet filling insertion is the most popular way of insertion systems in weaving. The heart of the air-jet filling insertion is the air flow, which provides the necessary propelling force for the yarn. In this work, the characteristics of airflow in air-jet filling insertion are discussed. The procedure and experimental system that is developed at Auburn University to measure the air flow characteristics is described.

scholarly journals Air flow in a tube composed of numerous ring plates. (Flow characteristics in air-guide of air jet loom).

1988 ◽  
Vol 54 (504) ◽  
pp. 1913-1919
Author(s):  
Kazunori YOSHIDA ◽  
Yutaka YAMADA
Keyword(s):  
Air Flow ◽  
Flow Characteristics ◽  
Air Jet ◽  
Air Jet Loom

scholarly journals Airflow and air velocity measurements while playing wind instruments, with respect to risk assessment of a SARS-CoV-2 infection

2020 ◽  
Author(s):  
Claudia Spahn ◽  
Anna Hipp ◽  
Bernd Schubert ◽  
Marcus Rudolf Axt ◽  
Markus Stratmann ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Wind Instruments ◽  
Velocity Measurements ◽  
Air Velocity ◽  
Airborne Transmission ◽  
Wind Instrumentalists ◽  
Alto Flute ◽  
Brass Instruments ◽  
Wind Instrument ◽  
Air Jet

AbstractDue to airborne transmission of infection with the coronavirus, the question arose as to how high the risk of spreading infectious particles can be while playing a wind instrument.To contribute to this question and to help clarify the possible risks, we analyzed 14 wind instruments, first qualitative by making airflows visible while playing and second quantitative by measuring air velocities at three distances (1m, 1.5m and 2m) in direction of the instrument’s bell.Measurements took place with wind instrumentalists of the Bamberg Symphony in their concert hall.Our findings highlight that while playing all wind instruments no airflow escaping from the instruments – from the bell with brass instruments, from the mouthpiece, keyholes and bell with woodwinds – was measured beyond a distance of 1.5m from the instruments’ bell, regardless of volume, pitch or what was played. With that, air velocity while playing corresponded to the usual value of hall-like rooms, of 0.1 m/s. For air-jet woodwinds, alto flute and piccolo, significant air movements were seen close to their mouthpieces, which escaped directly into the room without passing through the instrument and therefore generating directed air movements.

scholarly journals Air flow characteristics of a room with air vortex diffuser

2018 ◽  
Vol 240 ◽  
pp. 02002 ◽  
Author(s):  
Marek Borowski ◽  
Marek Jaszczur ◽  
Daniel Satoła ◽  
Michał Karch
Keyword(s):  
Air Flow ◽  
Ventilation System ◽  
Flow Characteristics ◽  
Comfort Level ◽  
Translational Velocity ◽  
Comfort Zone ◽  
Air Velocity ◽  
Velocity Decay ◽  
Different Diameters ◽  
Comfort Criteria

The air diffuser is a very important component of any ventilation system, and the comfort level of ventilated space occupants depend among many other factors on properly designed and choice of diffusers. At present a large number of diffusers are produced to meet a different kind of requirements. One of the most efficient and very popular types of the diffuser is the vortex diffuser in which air flow has angular as well as translational velocity components. This paper investigates experimentally airflow characteristics of vortex ceiling diffuser and its effect on airflow in a ventilated space. Two thermal comfort criteria namely: mean age of the air and ventilation effectiveness have been used to predict the comfort zone inside the room. Effect of supply air velocity on the flow field is investigated and hence the on comfort and energy consumption. The results show that significant amount of energy can be saved by using vortex diffuser in reference to the other diffusers type. The values of the velocity decay coefficient were compared for different diameters of vortex diffuser.

Air-flow characteristics and yarn whipping during start-up stage of air-jet weft insertion

2016 ◽  
Vol 86 (18) ◽  
pp. 1988-1999 ◽  
Author(s):  
Zhenyu Wu ◽  
Shenyang Chen ◽  
Yisheng Liu ◽  
Xudong Hu
Keyword(s):  
Air Flow ◽  
Flow Characteristics ◽  
Air Jet ◽  
Start Up

scholarly journals Airflow and Air Velocity Measurements While Playing Wind Instruments, with Respect to Risk Assessment of a SARS-CoV-2 Infection

2021 ◽  
Vol 18 (10) ◽  
pp. 5413
Author(s):  
Claudia Spahn ◽  
Anna Maria Hipp ◽  
Bernd Schubert ◽  
Marcus Rudolf Axt ◽  
Markus Stratmann ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Wind Instruments ◽  
Velocity Measurements ◽  
Air Velocity ◽  
Airborne Transmission ◽  
Wind Instrumentalists ◽  
Alto Flute ◽  
Brass Instruments ◽  
Wind Instrument ◽  
Air Jet

Due to airborne transmission of the coronavirus, the question arose as to how high the risk of spreading infectious particles can be while playing a wind instrument. To examine this question and to help clarify the possible risk, we analyzed 14 wind instruments, first qualitatively by making airflows visible while playing, and second quantitatively by measuring air velocity at three distances (1, 1.5, 2 m) in the direction of the instruments’ bells. Measurements took place with wind instrumentalists of the Bamberg Symphony in their concert hall. Our findings highlight that while playing, no airflows escaping from any of the wind instruments—from the bell with brass instruments or from the mouthpiece, keyholes or bell with woodwinds—were measurable beyond a distance of 1.5 m, regardless of volume, pitch or what was played. With that, air velocity while playing corresponded to the usual value of 1 m/s in hall-like rooms. For air-jet woodwinds, alto flute and piccolo, significant air movements were seen close to the mouthpiece, which escaped directly into the room.

scholarly journals EXPERIMENTAL RESEARCH ON THE DISTRIBUTION OF AIR STREAM VELOCITY USING THE TWO-LEVEL CYCLONE / EKSPERIMENTINIAI ORO SRAUTO GREIČIŲ PASISKIRSTYMO DVIEJŲ LYGIŲ CIKLONE TYRIMAI

2013 ◽  
Vol 5 (4) ◽  
pp. 330-336 ◽  
Author(s):  
Egidijus Baliukas ◽  
Pranas Baltrėnas
Keyword(s):  
Air Flow ◽  
Solid Particles ◽  
Maximum Speed ◽  
Stream Velocity ◽  
Velocity Measurements ◽  
Air Velocity ◽  
Air Volume ◽  
Air Stream ◽  
Before And After ◽  
Air Speed

In order to properly analysethe operation of a two-level multichannel cyclone,a studyon how air flow moves inside the cyclone is necessary. The two-level multichannel cyclone is designed to separate solid particles from the air stream andhas been built in the Environmental Protection Laboratory at Vilnius Gediminas Technical University. Researches on findinghow theair flow distributes withintwo levels and channels of the six-channel cyclone were made. Air velocity was measured using multimeter Testo–400 and dynamic Pito tube. Air velocity measurements in ducts before and after thedevice were done using an anemometer. The results showed that the air volume at both cyclone levels wereequal, and air velocity inthe channels that werethe same at both levels was also distributed equally. The highest air speed was measured at the end of the last IV channel and reached 13 m/s. Minimum air velocity can be observed when the rings are arranged in such way that 75% of the air flow returns to the previous channel, and the maximum speed is when the previous channel returns 25% of the air flow. Article in Lithuanian. Santrauka Siekiant tinkamai išanalizuoti dviejų lygių daugiakanalio ciklono veikimą būtina išnagrinėti valomo oro srauto judėjimą. Šis įrenginys skirtas kietosioms dalelėms iš oro srauto valyti. Daugiakanalis dviejų lygių ciklonas sukurtas ir pastatytas Vilniaus Gedimino technikos universiteto Aplinkos apsaugos laboratorijoje. Tyrimais siekiama nustatyti oro srauto pasiskirstymą dviejuose šešiakanalio ciklono lygiuose bei kanaluose. Oro greičiams kanaluose nustatyti naudojamas daugiafunkcis matuoklis Testo-400 ir dinaminis Pito vamzdelis. Oro srauto greičiams matuoti ortakiuose prieš ir už įrenginio naudojamas sparninis anemometras. Rezultatai rodė, kad į abu ciklone įrengtus lygius patenka vienodas oro tūris, ir greičiai šių lygių kanaluose pasiskirsto vienodai. Didžiausias greitis – 13 m/s užfiksuotas paskutiniojo kanalo pabaigoje. Mažiausi oro greičiai kanaluose esti, kai žiedai sudėti taip, kad 75 % oro srauto grįžtų į ankstesnį kanalą, o didžiausias greitis yra tada, kai į ankstesnį kanalą grįžta 25 % oro srauto.

scholarly journals AIR VELOCITY PROFILES IN AIR BLAST FREEZERS FILLED WITH BOXES OF FRUIT PULP MODELS

2004 ◽  
Vol 3 (2) ◽  
pp. 127
Author(s):  
J.V. Resende ◽  
V. Silveira Jr.
Keyword(s):  
Flow Rate ◽  
Air Flow ◽  
Freezing Process ◽  
Fruit Pulp ◽  
Air Flow Rate ◽  
Velocity Measurements ◽  
Air Velocity ◽  
Operation Conditions ◽  
Air Stream ◽  
Pass Through

The changes in the air velocities caused by the resistance for the air flow due to fruit pulp model packaged (100 grams) and conditioned in multi layers boxes during freezing process were evaluated and air flow rate were estimated using a method of treatment of the experimental data. The air velocities were measured before the air pass through the pillage of multi layer boxes in the air stream. For the measurements processing was used a non linear regression routine. Air flow rate measured by the present method resulted of the numerical integration of air velocities adjusted profile. Results presented a relative difference 10 % higher than the standard average procedure, which consists in averaging the air velocity measurements performed at each point of the section. In the same fan operation conditions, the results shown for the 7 layers arrays of product in the boxes which the air velocity was 62% lower than the 3 layers arrays and 50.9 % lower than the 5 layers arrays of product. These results were proportional to the bulk area for the air flow.

Dynamic Analysis of Airflow in Air-Jet Filling Insertion: Part I — Air Pressure Measurements

2002 ◽  
Author(s):  
Sayavur I. Bakhtiyarov ◽  
Sabit Adanur ◽  
Tacibaht Turel
Keyword(s):  
Dynamic Analysis ◽  
Textile Industry ◽  
Air Flow ◽  
Air Pressure ◽  
Experimental Measurements ◽  
Pressure Measurements ◽  
Pressure Losses ◽  
Air Jet

Air-jet filling insertion is the most used techniques in the textile industry. In this process the air flow provides the necessary propelling force to the yarn. Dynamic analysis of air flow in this process was studied experimentally in this work. In Part I we present the results of experimental measurements of pressure losses both in the tube-guided and in the profiled reed simulators.

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