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多相流测量技术简介 Introduction of measuring techniques for multiphase flow

多相流测量技术简介 Introduction of measuring techniques for multiphase flow. 吴昌宁 (Hardson) Fluidization Laboratory of Tsinghua University wuchn98@flotu.org. MedImaging@smth 版聚 2004.12.26. 实验室简介. 流态化科研基地 & 纳米技术产业化研究中心 工业界和学术界的合作伙伴 SINOPEC, PetroChina, etc.; PetroBras, GE, Air Products, etc.

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多相流测量技术简介 Introduction of measuring techniques for multiphase flow

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  1. 多相流测量技术简介Introduction of measuring techniques for multiphase flow 吴昌宁 (Hardson) Fluidization Laboratory of Tsinghua University wuchn98@flotu.org MedImaging@smth版聚 2004.12.26

  2. 实验室简介 • 流态化科研基地 & 纳米技术产业化研究中心 • 工业界和学术界的合作伙伴 SINOPEC, PetroChina, etc.; PetroBras, GE, Air Products, etc. Ohio State University, Delft University, Tokyo University, West Ontario University, etc. 反应器内 流场示意图 石油催化裂化和 催化裂解反应器 包括： 浓度场 速度场

  3. 多相流流体力学性质的主要研究方法 • 实验测量Particle Imaging Velocimetry (PIV) Laser Doppler Velocimetry (LDV) Ultrasonic Doppler Velocimetry (UDV) Optical Fiber Probe Flash X-ray Imaging System Process Tomography (PT) (developing) X-CT, ECT, UCT… • 数值模拟 Computational Fluid Dynamics (CFD)

  4. 多相流测量技术发展概览 X、γ射线衰减 非侵入式 线测量 发现X光 和放射性 CT算法 新型探测源高速探测器 传统测量 技术 PT、 PIV … 场测量 PT: 发展中 LDV … 非侵入式 点测量 发明Laser 高速CCD机 互相关算法 将 来 ？ 各有所长 互相结合 传感器技术的革 新 光纤探头技术等，侵入式，点测量

  5. PT技术(如X-CT) vs.其他测量技术 • non-invasive vs. probe • field information vs. probe/LDV • penetrability vs. LDV/PIV • temporal resolution limited by data acquisition employed in dense-phase

  6. X/γ射线在多相流测量中的早期应用 • Bartholomew et al. (1957), Shell Oil Co. • reconstructed suspension density in a riser Path layout for gamma ray measurements and reconstructed suspension density in a 518 mm ID riser

  7. Medical-CT应用于多相流测量 • Medical CT was applied to industrial process in 1980s. • Banholzer et al. (1987) fluidized bed:43-mm-diameter 150-mm-tall • a medical X-CT scanner • 9 s/slice, spatial resolution = 0.24*0.24*1.5 mm3 density resolution better than 30 kg/m3

  8. 改进Medical-CT应用于多相流测量 • Kantzas et al. (1994, 1996, 1997) • used a modified medical X-CT scanner to determine the holdup in fluidized and trickle beds • 3 s/slice, spatial resolution = 0.4*0.4*3 mm3 Medical-CT is often hard to be directly used in the industrial process because of its fixed X-ray, high price, huge volume…

  9. ICT应用于多相流测量(1) • Grassler and Wirth (1999) • a 60 keV X-ray source, 128angle, 200 times/angle (15s) • a linear detector with 1024 sensitive elements • 256 x 256, spatial resolution = 0.8 mm • 20~40 min/slice,the scanning time is too long… Grassler and Wirth (1999), Computerized Tomography for Industrial Applications and Image Processing in Radiology ,March 15~17

  10. ICT应用于多相流测量(2) • Kai et al. (2000) • eight election guns ,128detectors • 129*129, spatial resolution = 0.387 mm • 3.6 ms/slice inner diameter of measuring area is 50mm

  11. SkyScan micro-CT (版主吩咐偶介绍一下，其实偶也不懂，) • 采用同步加速器结构中的专用束线技术，降低了X射线的噪声 http://www.skyscan.be spatial resolution = 0.15~0.4m scan time = 10min spatial resolution = 48 m, scan time = 50s

  12. Thank you for your attention!

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