Abstract <p>With the development of alternative energy sources, an important task is the design and improvement of hydrogen generators for fuel cells. A promising approach is the reaction of nanodispersed aluminum with water, which produces a large amount of hydrogen within a short time. The interaction of highly dispersed aluminum with water must be controlled to prevent sharp increases in pressure and temperature. For this purpose, we propose metered powder injection into water using a pulsed disperser powered by explosive magnetic energy. The advantage of pulsed powder injection is the fragmentation of particle agglomerates and the disruption of the oxide shell, which is also an important technological challenge. To ensure the reaction proceeds in an optimal mode, it is necessary to study the propagation of particles in water during pulsed injection. To estimate the time required for particle distribution in the reaction volume, we propose a mathematical model of dispersion of highly dispersed powder in a liquid using a pulsed (explosive) disperser. The model takes into account the specific features of this method of dispersion, including rapid expansion of explosive magnetic reaction products, collapse of the gas bubble containing particles, and diffusion-driven particle propagation in the volume. A parametric study of the model was performed. Experimental results are presented on pulsed dispersion of a nanodispersed model powder (aluminum oxide) into water. The calculated dependences and order of magnitude of the studied parameters agree with experimental observations. The identified regularities of particle propagation in liquid during pulsed injection can be further applied to calculating the technical parameters of hydrogen generation systems based on the reaction of nanodispersed aluminum with water.</p>