Electrical Capacitance Tomography Measurement of Flow Patterns and Film Thickness in a Thermosyphon

查看全文 作　　者：[1]JingtaoLI;[2]QiCHEN;[1]XiangyuanDONG;[1]ShiLIU

机构地区：[1]InstituteofEngineeringThermophysics,ChineseAcademyofSciences,Beijing100080,China;[2]SchoolofMechanics,ElectronicsandControl,BeijingJiaotongUniversity,Beijing100044,China

出　　处：《Journal of Thermal Science》索引2005年第14卷第1期,共6页

摘　　要：An experimental study was performed to evaluate the suitability of using an electrical capacitance tomography (ECT) system to visualize the flow patterns, and to measure the film thickness of the annular flow in a two-phase closed thermosyphon (TPCT). The performance of the ECT system was examined over a range of flow conditions.The experimental data were compared with the visual observations and existing correlations. Results indicated that the ECT system, with the linear back projection (LBP) algorithm, could be used to give an on-line qualitative image of the flow patterns. The Landweber iteration algorithm with optimal step length was implemented off-line to reconstruct high-resolution images. Then, the images were analyzed to obtain the film thickness of the annular flow. The experimental data compared well with the Nusselt's equation in low vapor velocity range, but showed an increasing deficiency with the increase of vapor velocity. 关键词：热虹吸器电子电容X线断层摄影薄膜厚度流动模式二相流

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Electrical Capacitance Tomography Measurement of Flow Patterns and Film Thickness in a Thermosyphon

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