Numerical study on three-dimensional flow field of continuously rotating detonation in a toroidal chamber

AbstractTo investigate the distribution characteristics of the three-dimensional flow field under the slot die, an online measurement of the airflow velocity was performed using a hot wire anemometer. The experimental results show that the air-slot end faces have a great influence on the airflow distribution in its vicinity. Compared with the air velocity in the center area, the velocity below the slot end face is much lower. The distribution characteristics of the three-dimensional flow field under the slot die would cause the fibers at different positions to bear inconsistent air force. The air velocity of the spinning centerline is higher than that around it, which is more conducive to fiber diameter attenuation. The violent fluctuation of the instantaneous velocity of the airflow could easily cause the meltblowing fiber to whip in the area close to the die.

Download Full-text

Transient Three-Dimensional Flow Field Measurements by Means of 3D µPTV in Drying Poly(Vinyl Acetate)-Methanol Thin Films Subject to Short-Scale Marangoni Instabilities

Polymers ◽

10.3390/polym13081223 ◽

2021 ◽

Vol 13 (8) ◽

pp. 1223

Author(s):

Max Tönsmann ◽

Philip Scharfer ◽

Wilhelm Schabel

Keyword(s):

Flow Field ◽

Vinyl Acetate ◽

Three Dimensional ◽

Field Measurements ◽

Initial Assessment ◽

Ambient Conditions ◽

Three Dimensional Flow ◽

Dimensional Flow ◽

Short Scale ◽

Dry Film

Convective Marangoni instabilities in drying polymer films may induce surface deformations, which persist in the dry film, deteriorating product performance. While theoretic stability analyses are abundantly available, experimental data are scarce. We report transient three-dimensional flow field measurements in thin poly(vinyl acetate)-methanol films, drying under ambient conditions with several films exhibiting short-scale Marangoni convection cells. An initial assessment of the upper limit of thermal and solutal Marangoni numbers reveals that the solutal effect is likely to be the dominant cause for the observed instabilities.

Download Full-text

Three-dimensional flow-field measurements in multistage turbomachinery using a computer-aided system

10.1117/12.266687 ◽

1997 ◽

Author(s):

Antoni Smolny ◽

Jaroslaw Blaszczak ◽

Ryszard Pawlak

Keyword(s):

Flow Field ◽

Three Dimensional ◽

Field Measurements ◽

Three Dimensional Flow ◽

Dimensional Flow ◽

Computer Aided

Download Full-text

Study of Flow Field in Compact Spinning with Pneumatic Groove

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.332-334.260 ◽

2011 ◽

Vol 332-334 ◽

pp. 260-263

Author(s):

Shi Rui Liu

Keyword(s):

Flow Field ◽

Negative Pressure ◽

Static Pressure ◽

Three Dimensional ◽

Three Dimensional Flow ◽

Dimensional Flow ◽

Compact Zone ◽

Air Flows ◽

Compact Spinning

In the paper the structure of the compact spinning with pneumatic groove is introduced and the characteristics of three-dimensional flow field of the compact spinning with pneumatic groove are also investigated. Results from this research confirmed that In the compact zone, the air flows to the groove and enters the inner hollow of the slot-roller through the round holes, and the air on both sides of the groove condenses to the center of it and flows to the round holes; It is beneficial to compact the fiber and make the fiber slip to the bottom of the groove with shrink shape; the velocity and negative pressure are both not homogeneous, as the round holes are not continual, and the gradient of static pressure and velocity in compact zones are also perceptible.

Download Full-text