Bulletin of the Society of Sea Water Science, Japan
Online ISSN : 2185-9213
Print ISSN : 0369-4550
ISSN-L : 0369-4550
Influence of Thermal Stratification on the Penetration Depth of Cool Water Jet
Shunji SAKURAZAWAYasuyuki IKEGAMIAkiyoshi BANDOMasayuki UMEKIMasanori MONDE
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2005 Volume 59 Issue 4 Pages 292-300

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Abstract

A cool water jet was discharged horizontally into a water channel with thermal stratification, in order to examine the influence of a discharging condition and thermal stratification on the penetration depth of the jet.
Major deciding factors in the penetration depth are the discharging temperature and temperature gradient. The influence of the discharging velocity on the penetration depth is minor. The velocity is influential in horizontal distance until the jet begins to sink down.
Large eddy simulations (LES) using a non-isotropic Dynamic Smagorinsky model were performed and the numerical results were compared with the experimental results. The numerical results correspond to experimental ones accurately in terms of the penetration depth. It is confirmed that this model is available for simulation of the behavior of a cool jet into thermal stratification.
Numerical experiments using this model were performed to examine the relation of each factor in detail. It turned out that both the penetration depth and temperature gradient are correlated with the exponential function. The approximation using this function was suggested to estimate the penetration depth. The approximation was compared with the experimental results. This comparison clarified the application range for practical use of the approximation.

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