Abstract Density-wave fronts in a vibrofluidized wet granular layer undergoing a gas-liquid-like transition are investigated experimentally. The threshold of the instability is governed by the amplitude of the vertical vibrations. Fronts. which are curved into a spiral shape. https://www.bekindtopets.com/mega-choice-Nutri-Vet-Uri-Ease-Paw-Gel-for-Cats-hot-buy/