The method according to the invention for evaporating a predeterminable volume of a fluid comprises the following steps: a) successive addition of at least one first partial volume at a first volume adding rate (17) and at least one predeterminable second partial volume that is different from the first partial volume, at a second volume adding rate (17) to a supply line (3); b) at least partial evaporating of the partial volumes such that a vapor film is formed between the partial volumes and a wall of the supply line (3); c) conveying the partial volumes through the supply line (3) to an evaporator surface (5); and d) applying the partial volumes to a region of the evaporator surface (5), the position of which is varied as a function of at least one of the following parameters: i) the mass of the corresponding partial volume and ii) the volume adding rate (17) of the corresponding partial volume. The method according to the invention and the device (1) according to the invention advantageously permit an evaporation of a fluid, particularly of a urea/water solution, in a manner that is as effective as possible. The utilization of the highest possible proportion of evaporator surfaces is achieved by the mass and/or volume addition rate-dependent distribution of the impingement surfaces on the evaporator surface (5). For this purpose, a heating strategy is advantageously employed in the region of the supply line (3) that ensures that the Leidenfrost effect occurs when the individual partial volumes are added. In this manner, a distribution that is as even as possible can be achieved using a corresponding configuration of the geometry of the evaporator channel (4).