Viscous liquid films on a porous vertical cylinder: Dynamics and stability

	Viscous liquid films on a porous vertical cylinder: Dynamics and stability
	Ding ZJ(丁子敬); Wong TN; Liu R(刘荣); Liu QS(刘秋生)
刊名	PHYSICS OF FLUIDS
	2013-06-01
通讯作者邮箱	mtnwong@ntu.edu.sg; liu@imech.ac.cn
卷号	25 期号:6 页码:064101-18
关键词	Boundary layers Cylinders (shapes) Liquid films Navier Stokes equations Porous materials Reynolds number Boundary layer models Cut-off wave numbers Harmonic disturbances Moderate Reynolds numbers Nonlinear evolutions Permeability of the porous mediums Vertical cylinders
ISSN号	1070-6631
通讯作者	Wong, TN (reprint author), Nanyang Technol Univ, Sch Mech & Aerosp Engn, Singapore 639798, Singapore.
产权排序	[Ding, Zijing; Wong, Teck Neng] Nanyang Technol Univ, Sch Mech & Aerosp Engn, Singapore 639798, Singapore; [Liu, Rong; Liu, Qiusheng] Chinese Acad Sci, Inst Mech, Key Lab Micrograv, Natl Micrograv Lab, Beijing 100190, Peoples R China
合作状况	国际
中文摘要	In this paper, liquid films flowing down a porous vertical cylinder were investigated by an integral boundary layer model. Linear stability and nonlinear evolution were studied. Linear stability results of the integral boundary layer model were in good agreement with the linearized Navier-Stokes equations which indicated that the permeability of the porous medium enhanced the instability of the flow system. The growth rate and cut-off wave number increased with increasing the permeability and the Reynolds number. Linear stability analysis showed that the system was more unstable for a larger Reynolds number Re. Nonlinear studies showed that, for a very small Re, the film evolved with time while a saturated state was not observed. In addition, it was observed that the film ruptured when the permeability parameter beta > 0, and the rupture time decreased with increasing beta. However, for a moderate Reynolds number, a small finite harmonic disturbance evolved to a saturated traveling wave. Further investigation was conducted on the droplet-like wave solution. Results showed that the wave speed increased as the permeability parameter increased.
学科主题	流体力学
分类号	一类/力学重要期刊
收录类别	SCI ; EI
资助信息	National Natural Science Foundation of China [11102211]
原文出处	http://dx.doi.org/10.1063/1.4808112
语种	英语
WOS记录号	WOS:000321272600021
公开日期	2013-08-21
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/47360]
专题	力学研究所_国家微重力实验室
推荐引用方式 GB/T 7714	Ding ZJ,Wong TN,Liu R,et al. Viscous liquid films on a porous vertical cylinder: Dynamics and stability[J]. PHYSICS OF FLUIDS,2013,25(6):064101-18.
APA	丁子敬,Wong TN,刘荣,&刘秋生.(2013).Viscous liquid films on a porous vertical cylinder: Dynamics and stability.PHYSICS OF FLUIDS,25(6),064101-18.
MLA	丁子敬,et al."Viscous liquid films on a porous vertical cylinder: Dynamics and stability".PHYSICS OF FLUIDS 25.6(2013):064101-18.