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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Flow visualization and free surface length scales measurements in a horizontal jet beneath a free surface
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Flow visualization and free surface length scales measurements in a horizontal jet beneath a free surface

机译：流动可视化和自由表面长度在自由表面下方的水平射流中缩放测量

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In the context of the recent studies on turbulence/free surface interactions of Brocchini and Peregrine [M. Brocchini, D.H. Peregrine, The dynamics of strong turbulence at free surfaces. Part 1. Description, J. Fluid Mech. 449 (2001) 225-254; M. Brocchini, D.H. Peregrine, The dynamics of strong turbulence at free surfaces. Part 2. The boundary conditions, J. Fluid Mech. 449 (2001) 255-290] and Murzyn et al. [F. Murzyn, D. Mouaze, J.R. Chaplin, Optical fibre probe measurements of bubbly flow in hydraulic jumps, Int. J. Multiphase Flow 31(1) (2005) 141-154], this paper presents flow visualizations and free surface measurements of the flow generated at the free surface by a horizontal jet beneath this air/water interface. The main goal is focused on the free surface motion. The shadowgraph technique is used for the first part of this study and two wire gauges have been built to describe the free surface oscillations. Description of typical free surface length scales and frequencies are also obtained and shown through a correlation technique for different positions of the jet beneath the air/water interface. Comparisons of the flow visualizations with free surface length scales confirm that this shadowgraph technique is well defined for this kind of flows and very promising. Front velocity of the jet is deduced from the pictures taken with a digital camera and a comparison is made with theoretical work of Brocchini and Peregrine [M. Brocchini, D.H. Peregrine, The dynamics of strong turbulence at free surfaces. Part 1. Description, J. Fluid Mech. 449 (2001) 225-254; M. Brocchini, D.H. Peregrine, The dynamics of strong turbulence at free surfaces. Part 2. The boundary conditions, J. Fluid Mech. 449 (2001) 255-290] to define the nature of the flow. (C) 2006 Elsevier Inc. All rights reserved.
机译：在最近的研究中Brocchini和百富勤的湍流/自由表面相互作用[M. Brocchini，D.H. Peregrine，自由表面的强湍流动力学。第1部分。说明，J。流体机械。 449（2001）225-254; M. Brocchini，D.H。Peregrine，自由表面上的强湍流动力学。第2部分。边界条件，流体力学。 449（2001）255-290]和Murzyn等人。 [F。 Murzyn，D.Mouaze，J.R.Chaplin，《水力跃迁中气泡流的光纤探针测量》，Int。 J. Multiphase Flow 31（1）（2005）141-154]，本文介绍了在空气/水界面下方通过水平射流在自由表面产生的流动的流动可视化和自由表面测量。主要目标集中在自由表面运动上。阴影图技术用于本研究的第一部分，并且已经建立了两个线规来描述自由表面的振荡。还获得了典型自由表面长度尺度和频率的描述，并通过相关技术显示了空气/水界面下方射流的不同位置。与自由表面长度尺度的流动可视化的比较证实，这种阴影图技术已针对此类流动进行了很好的定义，并且非常有前途。从数码相机拍摄的照片中可以推断出射流的前速度，并与Brocchini和Peregrine [M. Brocchini，D.H. Peregrine，自由表面的强湍流动力学。第1部分。说明，J。流体机械。 449（2001）225-254; M. Brocchini，D.H。Peregrine，自由表面上的强湍流动力学。第2部分。边界条件，流体力学。 449（2001）255-290]来定义流的性质。 （C）2006 Elsevier Inc.保留所有权利。

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