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首页> 外文期刊>International Journal of Heat and Mass Transfer >Hydrodynamic and thermal oscillations in a non-isothermal laminar jet
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Hydrodynamic and thermal oscillations in a non-isothermal laminar jet

机译：非等温层流射流中的流体动力学和热振荡

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摘要

Oscillations in two-dimensional laminar jets have been studied numerically over a wide range of Reynolds and Grashof numbers. A finite volume approach based on primitive variables has been adopted. The numerical scheme is first validated using available experimental data for both the mean flow and the oscillatory behavior of isothermal jets, and then it is used to simulate results of the present study. The results indicate a strong spatial dependence of amplitude and existence of a broad band of frequencies, particularly in non-isothermal jets. High frequency oscillations are observed for forced convection dominated situations, while low frequency oscillations occur when buoyancy effects are predominant. With increasing buoyancy effect, the amplitudes are significantly modified and the oscillations become non-periodic even at low Reynolds number. The jet orientation is also found to influence the spectral distribution of oscillations. The predicted results can be significant in practical applications to devices in which mixing of non-isothermal jets occurs.
机译：二维层流射流的振荡已经在广泛的雷诺数和Grashof数上进行了数值研究。采用了基于原始变量的有限体积方法。首先使用等温射流的平均流量和振荡行为的可用实验数据对数值方案进行验证，然后将其用于模拟本研究的结果。结果表明，振幅的强空间依赖性和宽频带的存在，特别是在非等温射流中。对于强制对流占主导的情况，观察到高频振荡，而当浮力作用占主导时，则发生低频振荡。随着浮力效应的增加，振幅被显着改变，并且即使在低雷诺数下，振荡也变得非周期性。还发现喷射方向会影响振荡的频谱分布。预测结果在实际应用中会发生非等温射流混合的设备，这可能是重要的。

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