A comparison of magnetic resonance, X-ray and positron emission particle tracking measurements of a single jet of gas entering a bed of particles
A comparison of magnetic resonance, X-ray and positron emission particle tracking measurements of a single jet of gas entering a bed of particles
复制标题
进入粒子床的单股气体射流的磁共振、X 射线和正电子发射粒子跟踪测量的比较
DOI:
10.1016/j.ces.2014.09.029
复制
发表时间:
2015
影响因子:
4.7
通讯作者:
Pore M
中科院分区:
文献类型:
--
作者:
Pore M
Measurements of the lengths of a single jet of gas entering a packed bed were made using magnetic resonance imaging (MRI), positron emission particle tracking (PEPT) and X-ray radiography and the results compared. The experiments were performed using a Perspex bed (50 mm i.d.) of poppy seeds: air at 298 K was admitted to the base of the bed through a single, central orifice, 2 mm in diameter. Poppy seeds (Geldart Group B, measured minimum fluidisation velocity with air at 298 K and 1 atm of 0.13 m/s and particle density ~1060 kg/m3) were used because of their high content of oil, which contains mobile protons and hence is suitable for MRI examination. The lengths of jet measured using the three techniques were in agreement between 50 m/s<Uo<100 m/s, whereUois the superficial velocity through the orifice. BelowUo=50 m/s, X-ray measurements of jet lengths were shorter than those measured using MRI. This was attributed to the minimum diameter of void, found to be 5 mm, detectable in a 50 mm bed using ultra-fast X-ray measurements. PEPT is most commonly used to calculate particle velocities, whilst jet lengths are usually calculated from determinations of voidage. However, the particle locations determined in this work by PEPT were used to calculate a fractional occupancy count, from which a jet length could be inferred.
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DOI:
--
发表时间:
2000
期刊:
影响因子:
--
作者:
C. Zhu;Xiaohua Wang;L. Fan
通讯作者:
L. Fan
DOI:
--
发表时间:
1990
期刊:
影响因子:
--
作者:
T. Blake;H. Webb;P. Sunderland
通讯作者:
P. Sunderland
影响因子:
2.4
作者:
Wildman R
通讯作者:
Wildman R
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3.7
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Z. Yang;X. Fan;P. Fryer;D. Parker;S. Bakalis
通讯作者:
S. Bakalis
影响因子:
2.1
作者:
C. Müller;D. Holland;J. Davidson;J. S. Dennis;L. Gladden;A. Hayhurst;M. Mantle;A. Sederman
通讯作者:
A. Sederman