Abstract
Nuclear magnetic resonance (NMR) experiments are described for gas-fluidized granular beds, which are important systems for many materials-processing operations. Using pulsed field gradient, magnetic resonance imaging, and hyperpolarized gas NMR, detailed information is obtained for the density and motions of both grains and interstitial gas. In particular, dynamic correlations in the grain density are used to measure the bubble velocity and hyperpolarized xenon gas NMR is used to measure the bubble-emulsion exchange rate. A goal of these measurements is to verify in earth gravity first-principles theories of granular flows.
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References
Abragam A. (1961). The Principles of Nuclear Magnetism. Clarendon, Oxford
Callaghan P.T. (1991). Principles of Nuclear Magnetic Resonance Microscopy. Clarendon, Oxford
Caprihan A., Fukushima E., Rosato A. and Kos M. (1997). Magnetic resonance imaging of vibrating granular beds by spatial scanning. Rev. Sci. Instrum. 68: 4217–4220
Davidson J.F. and Harrison D. (1963). Fluidized Particles. Cambridge University Press, Cambridge
Fennell P.S., Davidson J.F., Dennis J.S., Gladden L.F., Hayhurst A.N., Mantle M.D., Müller C.R., Rees A.C., Scott S.A. and Sederman A.J. (2005). A study of the mixing of solids in gas-fluidized beds, using ultra-fast MRI. Chem. Eng. Sci. 60: 2085–2088
Geldart D. (1986). Gas Fluidization Technology. Wiley, New York
Huan, C., Yang, X., Candela, D., Mair, R.W., Walsworth, R.L.: NMR experiments on a three-dimensional granular medium. Phys. Rev. E 69(041), 302–1–13 (2004)
Jackson R. (2000). The Dynamics of Fluidized Particles. Cambridge University Press, Cambridge
Knight J.B., Ehrichs E.E., Kuperman V.Y., Flint J.K., Jaeger H.M. and Nagel S.R. (1996). Experimental study of granular convection. Phys Rev E 54: 5726–5738
Kunii D. and Levenspiel O. (1991). Fluidization Engineering. Butterworth-Heinemann, Boston
Kwauk M., Li J. and Yang W. (2001). Fluidization X. United Engineering Foundation, New York
Mair R.W., Wang R., Rosen M.S., Candela D., Cory D.G. and Walsworth R.L. (2003). Applications of controlled-flow laser-polarized xenon gas to porous and granular media study. Magn. Resonance Imaging 21: 287–292
Müller, C.R., Davidson, J.F., Fennell, P.S., Gladden, L.F., Hayhurst, A.N., Mantle, M.D., Rees, A.C., Sederman, A.J.: Real-time measurement of bubbling phenomena in a three-dimensional gas-fluidized bed using ultrafast magnetic resonance imaging. Phys. Rev. Lett. 96, 154,504–1–4 (2006)
Rees A.C., Davidson J.F., Dennis J.S., Fennell P.S., Gladden L.F., Hayhurst A.N., Mantle M.D., Müller C.R. and Sederman A.J. (2006). The nature of the flow just above the perforated plate distributor of a gas-fluidised bed, as imaged using magnetic resonance. Chem. Eng. Sci. 61: 5702–5715
Savelsberg, R., Demco, D.E., Blümich, B., Stapf, S.: Particle motion in gas-fluidized granular systems by pulsed-field gradient nuclear magnetic resonance. Phys Rev E 65, 020,301–1–4 (2002)
Walker T.G. and Happer W. (1997). Spin-exchange optical pumping of noble-gas nuclei. Rev. Mod. Phys. 69: 629–642
Wang, R.: Study of gas flow dynamics in porous and granular media with laser-polarized 129Xe NMR. Ph.D. Thesis, Massachusetts Institute of Technology (2005)
Wang R., Rosen M.S., Candela D., Mair R.W. and Walsworth R.L. (2005). Study of gas-fluidization dynamics with laser-polarized 129Xe. Magn. Resonance Imaging 23: 203–207
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This work was supported by US National Science Foundation Grant No. CTS-0310006.
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Candela, D., Huan, C., Facto, K. et al. NMR measurements of grain and gas motion in a gas-fluidized granular bed. Granular Matter 9, 331–335 (2007). https://doi.org/10.1007/s10035-007-0045-3
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DOI: https://doi.org/10.1007/s10035-007-0045-3