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Journal of Zhejiang University SCIENCE A 2006 Vol.7 No.3 P.347~351

http://doi.org/10.1631/jzus.2006.A0347


Coaxial liquid-liquid flows in tubes with limited length


Author(s):  Hu Ying-ying, Huang Zheng-ming

Affiliation(s):  School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China

Corresponding email(s):   huyingying@mail.tongji.edu.cn

Key Words:  Coaxial liquid-liquid flow, Exit-length, Instability, Die swell


Hu Ying-ying, Huang Zheng-ming. Coaxial liquid-liquid flows in tubes with limited length[J]. Journal of Zhejiang University Science A, 2006, 7(3): 347~351.

@article{title="Coaxial liquid-liquid flows in tubes with limited length",
author="Hu Ying-ying, Huang Zheng-ming",
journal="Journal of Zhejiang University Science A",
volume="7",
number="3",
pages="347~351",
year="2006",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.2006.A0347"
}

%0 Journal Article
%T Coaxial liquid-liquid flows in tubes with limited length
%A Hu Ying-ying
%A Huang Zheng-ming
%J Journal of Zhejiang University SCIENCE A
%V 7
%N 3
%P 347~351
%@ 1673-565X
%D 2006
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.2006.A0347

TY - JOUR
T1 - Coaxial liquid-liquid flows in tubes with limited length
A1 - Hu Ying-ying
A1 - Huang Zheng-ming
J0 - Journal of Zhejiang University Science A
VL - 7
IS - 3
SP - 347
EP - 351
%@ 1673-565X
Y1 - 2006
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.2006.A0347


Abstract: 
coaxial liquid-liquid flows were numerically studied in a nesting two-tube system. Calculations were carried out when various exit-lengths (meaning length differences between the two tubes) were used. Numerical results indicated that there exists a certain range of exit-length for the liquid-liquid flows to form stable and smooth interfaces, which requires that the exit-length should roughly be less than 5.6 times the outer tube diameter. In this range, interface instability is effectively restrained and the core fluid shows a phenomenon of die swell. When the exit-length is about 1.6 times the outer tube diameter, the core fluid has the greatest diameter size in the shell fluid. Velocity distributions at the outer tube exit favor formation of a continuous and stable core-shell structure.

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