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Transient Turbulent Flow and Heat Transfer Phenomena in Plate-Fin Type Cross-Flow Heat Exchanger

机译:板翅式错流换热器的瞬态湍流传热现象

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摘要

In this article, a transient performance of a plate-fin cross-flow heat exchanger with convergent-divergent longitudinal vortex generators is investigated. The effect of flow geometry is taken into account to analyze the transient forced convection heat transfer in a designed heat exchanger. The time-dependent Nusselt number and dissipation energy criterion are experimentally measured in 4- and 8-kW heater powers for various Reynolds numbers between 42,000 and 60,000 for the hot and cold fluids. In order to present the quality of the heat exchanger, the general empirical equations of the time-dependent Nusselt number and friction factor were derived as a function of the Reynolds number corresponding to fin geometry parameters. Following this, the transient behavior of the heat exchanger according to the change in the inlet and outlet temperatures of the hot and cold fluids was analyzed. The results showed that the variations of the time-dependent dissipation energy criterion increase with the increase in the Reynolds number. The appropriate correlations are proposed to predict the heat transfer and friction characteristics of the transient performance for the presented configuration, which indicates the designed heat exchanger has good heat conduction.
机译:在本文中,研究了具有收敛-发散纵向涡流发生器的板翅式错流热交换器的瞬态性能。考虑了流动几何形状的影响,以分析设计的热交换器中的瞬态强制对流传热。随时间变化的努塞尔数和耗散能量标准是通过在4kW和8kW加热器功率下对热流体和冷流体的雷诺数分别在42,000和60,000之间进行测量的。为了表示热交换器的质量,根据与翅片几何参数相对应的雷诺数,得出了随时间变化的努塞尔数和摩擦系数的一般经验方程式。此后,根据热流体和冷流体的入口和出口温度的变化,分析了热交换器的瞬态行为。结果表明,随时间的耗散能量准则的变化随雷诺数的增加而增加。提出了适当的相关性来预测所提出配置的瞬态性能的传热和摩擦特性,这表明所设计的热交换器具有良好的导热性。

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