1. Finite volume analysis of airflow field in the dual-feed and conventional rotor spinning unit
Presenter: Nicholus Tayari Akankwasa
Ph.D. Fellow, College of Textiles, Donghua University
 ORCID: 

2. Introduction Conventional Rotor spinning The dual-feed concept
Related Works
Proposed Approach
Experimental Details
Results and Analysis
Conclusions
Introduction
Conventional Rotor spinning
The dual-feed concept
Over 4 decades existence
High production
Cost effective
low strength yarns compared other spinning methods
Costly blending
One decade invention
Modified notion
Improved yarn properties
Effective blending
Not commercialized 2

3. Related Works The dual-feed unit research 3 Conventional unit
Introduction
Related Works
Proposed Approach
Experimental Details
Results and Analysis
Conclusions
Related Works
The dual-feed unit research
Conventional unit
M. Hajilari et al, 2007
A.Peyvari et al et al, 2014
Trash removal was achieved
Fibers opened by a single opening roller
Prototype achieved spinning synthetic fibers
Challenge with trash removal
2/7 3

4. Proposed Approach 4 Rotor Introduction Related Works Proposed Approach
Experimental Details
Results and Analysis
Conclusions
Proposed Approach
Rotor
D= 40mm h= 15mm
d1 = 4mm d= 1mm
L = 2mm β = 25.3 ͦ
Φ = 2mm θ = 66 ͦ 4

5. Our Goal Evaluate 3-D airflow in two models
Introduction
Related Works
Proposed Approach
Experimental Details
Results and Analysis
Conclusions
Our Goal
Evaluate 3-D airflow in two models
Develop a computational model
Analyze the flow domain based on FVM
Study the interior flow characteristics
Evaluate the yarn properties 5 5

6. Experimental Details Model construction Grid independency test Meshing
Introduction
Related Works
Proposed Approach
Experimental Details
Results and Analysis
Conclusions
Experimental Details
Model construction
Grid independency test
Meshing
Solidworks
Ansys Fluent
Turbulent k-ɛ model
Size 1,030,182 tetrahedron cells
SIMPLE- discretization
Simulation runs and CFD visualization
Analyze CFD results
Yarn properties comparison 6

7. Experimental Details Mesh and boundary conditions Geometrical model 7
Introduction
Related Works
Proposed Approach
Experimental Details
Results and Analysis
Conclusions
Experimental Details
Mesh and boundary conditions
Geometrical model 7

9. Experimental Details Parameters specification 8 Parameter Value
Introduction
Related Works
Proposed Approach
Experimental Details
Results and Analysis
Conclusions
Experimental Details
Parameters specification
Parameter
Value
Velocity inlet, m/s 20
Pressure inlet, Pa
-7000
Pressure outlet, Pa
1.01 x 105
Rotor speed, rpm
100,000
Iterations
6000 8

10. Introduction
Related Works
Proposed Approach
Experimental Details
Results and Analysis
Conclusions
Experimental Details
Grid independence test velocity variation at x-z plane at y=2mm along x-axis:
(a, b) Conventional rotor spinning unit; (c,d) novel dual-feed rotor spinning unit. 9

11. Introduction
Related Works
Proposed Approach
Experimental Details
Results and Analysis
Conclusions
Results and Analysis
Flow Visualization: Velocity magnitude Iso-surfaces
Iso-surfaces of velocity magnitude (a, c) a dual-feed model, (b, d) conventional model(FVM)
Extraction of the velocity profiles in the two models was achieved in Tecplot CFD 10

12. Results and Analysis Flow Visualization: Negative pressure comparison
Introduction
Related Works
Proposed Approach
Experimental Details
Results and Analysis
Conclusions
Results and Analysis
Flow Visualization: Negative pressure comparison
At z=0.228mm (a) Conventional rotor spinning unit, (b) dual-feed rotor spinning unit; z=0.468mm (c) conventional rotor spinning unit, (d) dual-feed rotor spinning unit. 11

13. Results and Analysis Vortices visualization along rotor vertical axis
Introduction
Related Works
Proposed Approach
Experimental Details
Results and Analysis
Conclusions
Results and Analysis
Vortices visualization along rotor vertical axis
Vortices visualization along rotor vertical axis(y=2-6, 8mm): 12

14. Introduction
Related Works
Proposed Approach
Experimental Details
Results and Analysis
Conclusions
Results and Analysis
Comparison of yarn properties 55/45 Polyester cotton
Yarn sample
Dual-feed model
Conventional model
Tenacity (cN/tex)
14.321
12.633
Elongation (%)
11.026
10.162
Yarn evenness and
imperfections
/km
CVm (%)
15.4
17.03
Thin (-35%)
12.4
16.2
Thick (+35%)
9.33
9.96
Hairiness
3 mm
4.2
4.3 13

15. Introduction
Related Works
Proposed Approach
Experimental Details
Results and Analysis
Conclusions
Conclusions
The second channel improves the way fibers are aligned in the yarn structure leading to improved yarn properties.
Computational model adopted clearly represents the flow behavior in the rotor interior.
Even distribution of velocity and pressure in a dual-feed model 14

16. Introduction
Related Works
Proposed Approach
Experimental Details
Results and Analysis
Conclusions
Conclusions
Stream traces and vortices attain an orderly path in the new model
Dual-feed spun yarns have better tenacity, elongation at break, hairiness, and less thick and thin places. 15

17. References [1] Kong LX and Platfoot RA. 2007 Text. Res. J. 67 269
Introduction
Related Works
Proposed Approach
Experimental Details
Results and Analysis
Conclusions
References
[1] Kong LX and Platfoot RA Text. Res. J
[2] Akankwasa NT, Lin H, Zhang Y and Wang J Text. Res. J.
[3] Lin HT, Zeng YC and Wang J Text. Res. J
[4] Hajilari, M., Eskandarnejad S. , Behzadan H. , and M. B. Moghadam Fibers and Polymers 8(5):543–49.
[5] Peyravi, A., Eskandarnejad S. , and Mohammad B The J. of Tex. Instit.105(4):377–82. 16

18. Introduction
Related Works
Proposed Approach
Experimental Details
Results and Analysis
Conclusions
Our related works
Akankwasa NT, Lin H, Zhang Y, et al. Numerical simulation of three-dimensional airflow in a novel dual-feed rotor spinning box. Text Res J 2016
Akankwasa Nicholus Tayari, Lin Huiting , Wang Jun, Evaluation of the dual-feed rotor spinning unit based on airflow dynamics and blended yarn properties Journal of the Textile Institute, In press p 1-12, March 25, 2017
Huiting Lin, Josep M Bergadà, Yongchun Zeng, Akankwasa Nicholus Tayari, Yuze Zhang, Jun Wang,2017 Rotor spinning transfer channel design optimization via Computational Fluid Dynamics Textile Research Journal 2017
Nicholus Tayari Akankwasa, Lin H, Wang J. Evaluation of drag and lift in the internal flow field of a dual rotor spinning unit via CFD. In: 2nd International Conference on Mechanical, Manufacturing, Modeling and Mechatronics, University of Gent. Matec Web of Conferences, 2017, p. 1-6
Lin Huiting, Akankwasa Nicholus Tayari and Wang Jun Simulating fiber motion in the airflow in a rotor spinning unit MATEC Web Conference; 2017 volume: 104, DOI: /matecconf/
More details:  ORCID:  17

19. Thank you Questions & comments
Contact