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JET MIXING OF CRYOGEN AND WATER

Jan Dahlsveen
Department of Mechanics, Thermo- and Fluid Dynamics Norwegian University of Science and Technology, N-7491 Trondheim, Norway

Reidar Kristoffersen
Department of Mechanics, Thermo- and Fluid Dynamics Norwegian University of Science and Technology, N-7491 Trondheim, Norway

Lars R. Saetran
Department of Mechanics, Thermo and Fluid Dynamics Norwegian University of Science and Technology N-7034 Trondheim, Norway

Abstract

This paper contains description of experiments with liquefied nitrogen jets injecting into water, where the jet penetration depth below the water surface is measured. The results are compared with numerical simulations by a axis-symmetric premixing code. Experiments and simulations show that the penetration depth is dependant on the jet buoyancy and momentum flux, but that there is little mixing of cryogen with water. Comparisons are made with experiments with small scale and industrial scale releases, and good agreement with penetration depth and plume geometry is found.