任意系统中局部微小体积内的熵改变由两部分组成：dS=deS+diS，deS称为熵流（entropy flux），它是由于系统与周围环境间的物质流和能量流而引起的熵变。视流的方向，其值可正可负。
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entropy-entropy flux 熵熵流对
entropy-entropy flux pairs 熵熵流对
The air flux was then thought equal entropy flux, therefore the mathematical model was obtained.
此时把空气流看作等熵流动，从而得出数学模型。
The relationship between the properties of double singularities, noise correlation time and dissipative parameter and their effects on entropy flux and entropy production are discussed.
分析（非平衡约束下）所引入的奇异性强度参数、噪声相关时间与耗散参数的相互作用以及对熵流、熵产生的显著影响。
The effects of the heat flux, wall temperature and flow resistance on the nondimensional entropy generation density have been discussed.
讨论了壁面热流、壁面温度及流动阻力对无因次熵产强度的影响。
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