Numerical Simulation of Magnetic Relaxation Induced by Flow

English version Previous studies on Nuclear Magnetic Relaxation (NMR) subjected to flow in a porous medium started from experimental observation of the phenomenon. These experiments failed to register the effect of the flow. In this work , in order to study the feasibility to observe the phenomena, Nuclear magnetic relaxation subjected to laminar flow in a porous medium is simulated using a Monte Carlo technique and treated analytically in terms of the Reorientation Mediated by Translational Displacements (RMTD)[KIM/02] formalism. Molecular diffusion is assumed to be superimposed by laminar flow in the sense of hydro-dynamic dispersion. Transport along rough or curved surfaces is then expected to lead to enhanced spin-lattice relaxation by the RMTD process. Different surface structures have been simulated. The modular architecture used resulted in a reusable/extendable program and aided in performance issues. Good agreement between the results of the simulation and the analytical theory was found. The spectral densities were obtained by Fourier transformation, so that predictions for relaxation experiments could be established. The conditions for observable relaxation effects appear to be quite realistic and preliminary experimental results agree with simulated results.