A novel mechanism of the formation of electron-positron outflow from hot accretion disks AIP Conf. Abstract.We suggest that an additional spiral density wave can exist in the inner parts of the cool accretion disk, where gas-dynamical perturbations are negligible. This spiral wave is due to the retrograde precession of the streamlines in the binary system. The results of a three-dimensional gas-dynamical simulation have shown that a considerable increase in the accretion rate (by an order of magnitude) is associated with the formation of the "precessional" spiral wave. Basing on this fact we suggest a new mechanism for the superoutbursts and superhumps in binaries.

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