热科学学报（英文版）2009，Vol.18Issue(1)：8-12,5.DOI:10.1007/s11630-009-0008-6
Measurement of Ice Movement in Water Using Electrical Capacitance Tomo-graphy
Measurement of Ice Movement in Water Using Electrical Capacitance Tomo-graphy
摘要
Abstract
The permafrost with the highest altitude and largest area in the mid and low latitude is located in the Qing-hai-Tibet Plateau. As most frozen soils contain ice particles which are very sensitive to temperature and other ex-ternal parameters, thus influencing the stability of the embankment in permafrost regions, it is very important to develop techniques to prevent damages to railway embankments due to thaw settlement. In this paper, the electri-cal capacitance sensors are designed to study the freezing front movement in a vessel and ice movement in water, which is the first step to apply the ECT system to the study of frozen soil. Two sensor arrangements are put into use. First, the traditional closed electrode sensors are put into use. In this arrangement, the electrodes are attached to the outside of the pipe or vessel, and the cross-sectional distribution of ice and water could be reconstructed from the capacitances measured. Also, the ice moving track at the cross section could be reflected thoroughly. Since the traditional closed electrode sensors can not meet the needs of measuring the ice freezing front move-ment, a new electrode sensors structure, that is, the unclosed electrode sensors are designed to satisfy the specific test of frozen soil. In this arrangement, several pairs of electrodes are arranged along the height of the vessel. A sudden decrease in the measured capacitance is observed when the freezing front advances past the electrodes. Therefore, according to the capacitance variation, the ice movement can be reflected. In summary, electrical ca-pacitance tomography has the advantages of being non-intrusive. With different electrode sensor arrangement, ice movement and ice freezing front can be obtained. The electrical capacitance sensor system can be applied to in-vestigate the complicated phenomena in frozen soil.关键词
Electrical Capacitance Tomography/Ice-Water Interface/Two-Phase Flows/Frozen SoilKey words
Electrical Capacitance Tomography/Ice-Water Interface/Two-Phase Flows/Frozen Soil分类
数理科学引用本文复制引用
JIANG Fan,LIU Shi,LIU Jing ,WANG Xueyao..Measurement of Ice Movement in Water Using Electrical Capacitance Tomo-graphy[J].热科学学报（英文版）,2009,18(1):8-12,5.基金项目
This work is supported by a grant of the Knowledge Innovation Program of the Chinese Qcademy of Sciences(grant no. KZCXI-SW-04)and the National Natural Science Fund (grant no. 40501017). （grant no. KZCXI-SW-04）
