AN IMPROVED INTEGRAL MODEL FOR A ROUND TURBULENT BUOYANT JET BASED ON THE TURBULENT MEASUREMENTS
The development of an improved integral model for a round turbulent buoyant jet discharged into a stagnant fluid is reported here, based on the published laboratory measurements of the turbulent quantities in recent years. In order to include turbulent terms into the integral model, instead of using the control volume method, the differential method that necessitates tedious mathematical procedures is used to derive the equations. The approach is as follows: The three-dimensional governing equations of fluid mechanics are firstly transformed to the partial differential forms in a natural coordinate system; Secondly, the solution variables in the instantaneous equations are decomposed into the mean and fluctuating components, and the Reynolds averaging operations are then performed; Finally, the Reynolds-averaged governing equations are integrated over the jet cross-section, based on the axisymmetrical assumption and the best-fit curves obtained from the experimental data. Since the fluxes of a passive tracer or momentum due to the turbulent transport were measured to be about 8～15% of the advective mean fluxes, incorporating the turbulent quantities into the integral model should improve the accuracy of the prediction.
orthogonal coordinate system plume jet, self-similarity Froude number
Hongxuan Yang Minjiao Lu Kumakura Toshirou Hayakawa Norio
Nagaoka Univ.of Tech.Nagaoka, Niigata, Japan
国际会议
第16届亚太地区国际水利学大会暨第3届水工水力学国际研讨会(16th IAHR-APD Congress and 3rd Symoposium of IAHR-ISHS)
南京
英文
574-579
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）