Abstract

This article describes experimental and numerical investigations of the stability of a water jet with a rectangular cross section aligned with the gravity field. This work focuses on the individual physical phenomena influencing the stability of the free surface jet flow like the contraction of the planar jet as well as the generation of capillary waves. In order to investigate the interaction between these two effects a series of experiments using water as model fluid are conducted in the Karlsruhe Liquid metal Laboratory KALLA at the research centre Karlsruhe. For the measurement of the cross-sectional shape of free water jet the Laser Doppler Anemometer (LDA) has been applied. Complementary to the experiments the numerical simulations have been performed using the commercially available code STAR-CD. The simulations show a reasonable agreement with the experimental measurements within the investigated parameter range.

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