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Modeling of the impact of fluid velocities on heat exchanger dynamics

机译:流体速度对热交换器动力学影响的建模

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The dynamic behaviour of one-dimensional flow (co-current and counter-current) heat exchangers is studied. The main purpose of this paper is modelling of tubular heat exchanger temperature dynamic dependence on the two fluids velocities. An important property of convexity of the ratio of temperatures time constants at the outputs of the process was highlighted. Thus, the fluids dynamics are bounded by linear relationship τ~*_(c,out) = (αV~* + β)τ~*_(h,out). Analytical expression of α and β are given for counter-current heat exchanger. The sum α + β is sensibly constant for the two configurations (co-current and counter-current). Numerical investigations show that this results are valid for different characteristics of fluid and for the heat exchanger material characteristics.
机译:研究了一维流动(并流和逆流)热交换器的动态行为。本文的主要目的是根据两种流体的速度对管式换热器的温度动态依赖性进行建模。突出了该过程的输出处的温度时间常数之比的凸性的重要性质。因此,流体动力学受线性关系τ〜* _(c,out)=(αV〜* +β)τ〜* _(h,out)限制。给出了逆流热交换器的α和β的解析表达式。对于两种配置(并流和逆流),α+β的总和是合理恒定的。数值研究表明,该结果对于流体的不同特性和热交换器材料特性都是有效的。

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