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Journal of Porous Media
IF: 1.49 5-Year IF: 1.159 SJR: 0.43 SNIP: 0.671 CiteScore™: 1.58

ISSN Print: 1091-028X
ISSN Online: 1934-0508

Volumes:
Volume 22, 2019 Volume 21, 2018 Volume 20, 2017 Volume 19, 2016 Volume 18, 2015 Volume 17, 2014 Volume 16, 2013 Volume 15, 2012 Volume 14, 2011 Volume 13, 2010 Volume 12, 2009 Volume 11, 2008 Volume 10, 2007 Volume 9, 2006 Volume 8, 2005 Volume 7, 2004 Volume 6, 2003 Volume 5, 2002 Volume 4, 2001 Volume 3, 2000 Volume 2, 1999 Volume 1, 1998

Journal of Porous Media

DOI: 10.1615/JPorMedia.2019026774
pages 1627-1638

INVESTIGATION ON CAPILLARY FLOW IN TUBES WITH VARIABLE DIAMETERS

Xu Cheng
School of Energy and Power Engineering, Shandong University, Jinan 250061, China
Yan Chen
School of Energy and Power Engineering, Shandong University, Jinan 250061, China
Hongru Li
School of Energy and Power Engineering, Shandong University, Jinan 250061, China
Baixue Li
School of Energy and Power Engineering, Shandong University, Jinan 250061, China
Xi Han
School of Energy and Power Engineering, Shandong University, Jinan 250061, China
Gongming Xin
School of Energy and Power Engineering, Shandong University, Jinan 250061, China

ABSTRACT

Capillary flow in single cylindrical tubes with constant diameters (0.2 and 0.4 mm) was investigated experimentally, using alcohol as working fluid. The flow behavior was recorded by a high-speed camera in terms of height-time relationship and compared with an existing theoretical model. The experimental results illustrated good consistency with the model. Next, experiments were conducted in variable diameter tubes (expanding from 0.2 to 0.4 mm and contracting from 0.4 to 0.2 mm) and the capillary flow characteristics were analyzed. Before reaching the change point the flow showed a similar trend as that in constant diameter tubes, but it demonstrated different features after passing the change point. It was also found that the location of change point had great influence on the flow behavior.

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