The need of experiments for validation of the computational tools to analyze the mixing of diluted slugs has been recognized in various countries. The test series performed at the UM2×4 loop test facility for the International Standard Problem ISP-43 provides a platform for experiences to be applied to the simulation of a well-defined test series. Test A was calculated with the CFD Code CFX-4.3. The results of the calculation show qualitatively good agreement with the experimental data. The structure of the flow field and the form of the propagating temperature perturbation front are well modeled by the CFD code. However, deviations occur at local positions. Comparative calculations with and without taking into account buoyancy have shown, that buoyancy effects are noticeable, but the mixing is mainly momentum controlled.

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