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The impact of air saturation on the flow structure beneath air-water interface during natural convection

机译：自然对流过程中空气饱和度对气水界面下方流动结构的影响

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摘要

We report on results from an experimental study conducted to investigate the impact of air saturation on the turbulent structure beneath air-water interface. Particle image velocimetry (PIV) was used to measure the two dimensional velocity fields beneath the water surface. The results show that air saturation has a significant impact on the waterside turbulent structure. As the air becomes saturated, the magnitudes of the horizontal and vertical turbulent velocities are decreased by factors of 5 and 2.5, respectively. It was argued that in addition to the surface heat flux, the waterside flow field is also influenced by the airside velocity via the air-water interface. The latent heat flux at the saturation state is not equal to zero. The film condensation on the tank walls at the saturation state is found to be responsible for the latent heat flux. The spectral analysis shows that both the horizontal and vertical turbulent motions are much weaker than that for the unsaturated case. For the saturated case, the range of the turbulent motions responsible for working against buoyancy forces is smaller than that for the unsaturated case. It was concluded that during natural convection, when the turbulence is relatively weak, in addition to the buoyancy subrange, another subrange exists within the inertial subrange, where the turbulent motions are simply con-vected by the buoyancy forces and that the energy interaction is highly dependent on the energy of the turbulent motions and the magnitude of the buoyancy forces.
机译：我们报告了一项旨在研究空气饱和度对空气-水界面下湍流结构的影响的实验结果。粒子图像测速仪（PIV）用于测量水面以下的二维速度场。结果表明，空气饱和度对水边湍流结构有重要影响。随着空气变得饱和，水平和垂直湍流速度的幅度分别减小了5倍和2.5倍。据认为，除表面热通量外，水侧流场还受空气侧速度通过空气-水界面的影响。饱和状态下的潜热通量不等于零。发现在罐壁上处于饱和状态的薄膜凝结是潜热通量的原因。频谱分析表明，水平和垂直湍流运动都比不饱和情况弱得多。对于饱和情况，负责抵抗浮力的湍流运动范围小于不饱和情况。结论是，在自然对流期间，当湍流相对较弱时，除了浮力子范围外，在惯性子范围内还存在另一个子范围，在该子范围中，湍流运动仅由浮力对流，并且能量相互作用非常强。取决于湍流运动的能量和浮力的大小。

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