The invention is a method and cyclonic separator for degassing a fluid mixture comprising a carrier liquid and gaseous or vaporizable components. In this method, the fluid mixture is accelerated in a throat section of a vortex tube such that the static pressure of the fluid mixture is decreased and vaporizable components evaporate into a gaseous phase and the fluid mixture flows as a substantially homogeneously dispersed gas-liquid mixture through the throat section; the accelerated fluid mixture is induced to swirl within a tubular mid section of the vortex tube such that the fluid mixture is separated by centrifugal forces into a degassed liquid fraction and a gas enriched fraction; the degassed liquid fraction is induced to flow into an annular liquid outlet conduit; and the gas enriched fraction is induced to flow into a central gas outlet conduit.