Investigation of the hydrodynamic behavior of diatom aggregates using particle image velocimetry

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境水质学国家重点实验室

	Investigation of the hydrodynamic behavior of diatom aggregates using particle image velocimetry
	Xiao, Feng
刊名	JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA
	2012
卷号	24 期号:7 页码:1157－1164
关键词	diatom aggregate fluid collection efficiency fractal particle image velocimetry
ISSN号	1001-0742
中文摘要	The hydrodynamic behavior of diatom aggregates has a significant influence on the interactions and flocculation kinetics of algae. However, characterization of the hydrodynamics of diatoms and diatom aggregates in water is rather difficult. In this laboratory study, an advanced visualization technique in particle image velocimetry (PIV) was employed to investigate the hydrodynamic properties of settling diatom aggregates. The experiments were conducted in a settling column filled with a suspension of fluorescent polymeric beads as seed tracers. A laser light sheet was generated by the PIV setup to illuminate a thin vertical planar region in the settling column, while the motions of particles were recorded by a high speed charge-coupled device (CCD) camera. This technique was able to capture the trajectories of the tracers when a diatom aggregate settled through the tracer suspension. The PIV results indicated directly the curvilinear feature of the streamlines around diatom aggregates. The rectilinear collision model largely overestimated the collision areas of the settling particles. Algae aggregates appeared to be highly porous and fractal, which allowed streamlines to penetrate into the aggregate interior. The diatom aggregates have a fluid collection efficiency of 10%-40%. The permeable feature of aggregates can significantly enhance the collisions and flocculation between the aggregates and other small particles including algal cells in water.
WOS记录号	WOS:000306581100001
公开日期	2014-11-04
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/7848]
专题	生态环境研究中心_环境水质学国家重点实验室
推荐引用方式 GB/T 7714	Xiao, Feng. Investigation of the hydrodynamic behavior of diatom aggregates using particle image velocimetry[J]. JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA,2012,24(7):1157－1164.
APA	Xiao, Feng.(2012).Investigation of the hydrodynamic behavior of diatom aggregates using particle image velocimetry.JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA,24(7),1157－1164.
MLA	Xiao, Feng."Investigation of the hydrodynamic behavior of diatom aggregates using particle image velocimetry".JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA 24.7(2012):1157－1164.