کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5407856 | 1393239 | 2006 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Application of k- and q-space encoding NMR techniques on granular media in a 3D model fluidized bed reactor
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Application of k- and q-space encoding NMR techniques on granular media in a 3D model fluidized bed reactor Application of k- and q-space encoding NMR techniques on granular media in a 3D model fluidized bed reactor](/preview/png/5407856.png)
چکیده انگلیسی
A combination of PFG-NMR imaging and velocity encoding methods was applied to investigate the dynamic behavior of a bed of poppy seeds subjected to air flow, representing a model setup for fluidized bed reactors. The particle motion is described both from a statistical point of view, by determining propagators and dispersion coefficients representing an average over the whole bed volume, as well as combined with spatial resolution by generating velocity maps. Velocity images of different horizontal slices in the bed confirm the notion of a toroidal particle flow pattern inside the shallow granular bed. Despite the need of considerable averaging due to the random motion of the relatively few particles in the bed, quantitative velocity images and statistical information about the random particle motion can be obtained from monitoring the fluid component in the seeds by conventional spin-echo techniques.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetic Resonance - Volume 178, Issue 2, February 2006, Pages 308-317
Journal: Journal of Magnetic Resonance - Volume 178, Issue 2, February 2006, Pages 308-317
نویسندگان
Silke Harms, Siegfried Stapf, Bernhard Blümich,