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nComputational fluid dynamic modeling of liquid-gas flow patterns and hydraulics in the cross-corrugated channel of a plate heat exchanger
International Journal of Multiphase Flow ( IF 3.8 ) Pub Date : 2020-01-01 , DOI: 10.1016/j.ijmultiphaseflow.2019.103163
Xiaowei Zhu , Fredrik Haglind

Abstract The morphology of liquid–gas flows in corrugated plate heat exchangers is complex due to the intricate channel geometry. To date, only a few experimental visualizations have been performed to study the two-phase flow characteristics in plate heat exchangers. In this paper, we perform pioneering computational fluid dynamics simulations of the adiabatic liquid–gas (water-air) flow in a cross-corrugated channel of a plate heat exchanger. The standard volume-of-fluid technique is used to capture the complex phase-interfaces constructed by the cross-corrugated walls. In order to reduce the computational cost, the computational domain is simplified by a series of assumptions. The bubbly flow, slug flow, churn flow and film flow are modeled by varying the superficial velocities of both phases, and the validity of these patterns is proved by comparison with experimental results. A flow regime map is developed based on the numerical results, and the transitions between the regimes are discussed. The predicted pressure drop shows good agreement with the experimental data. The two-phase multiplier for general prediction of the friction factor in the cross-corrugated channel is calibrated. The mean void fraction in the channel is quantified by the numerical simulation. The void fraction model from Zuber and Findlay is found to be applicable to the cross-corrugated channel, which is further modified for general use for these types of channel flows.

中文翻译:

n 板式换热器交叉波纹通道中液-气流动模式和水力学的计算流体动力学建模

摘要 由于复杂的通道几何形状,波纹板式换热器中液-气流动的形态很复杂。迄今为止,仅进行了少数实验可视化来研究板式换热器中的两相流动特性。在本文中,我们对板式换热器的交叉波纹通道中的绝热液-气(水-空气)流动进行了开创性的计算流体动力学模拟。标准的流体体积技术用于捕获由交叉波纹壁构成的复杂相界面。为了降低计算成本,通过一系列假设来简化计算域。通过改变两相的表观速度来模拟气泡流、段塞流、搅动流和薄膜流,并通过与实验结果的比较证明了这些模式的有效性。基于数值结果开发了流态图,并讨论了流态之间的转变。预测的压降与实验数据显示出良好的一致性。校准了用于交叉波纹通道中摩擦系数一般预测的两相乘法器。通道中的平均空隙率通过数值模拟量化。发现来自 Zuber 和 Findlay 的空隙率模型适用于交叉波纹通道,该模型经过进一步修改以用于这些类型的通道流的一般用途。预测的压降与实验数据显示出良好的一致性。校准了用于交叉波纹通道中摩擦系数一般预测的两相乘法器。通道中的平均空隙率通过数值模拟量化。发现来自 Zuber 和 Findlay 的空隙率模型适用于交叉波纹通道,该模型经过进一步修改以用于这些类型的通道流的一般用途。预测的压降与实验数据显示出良好的一致性。校准了用于交叉波纹通道中摩擦系数一般预测的两相乘法器。通道中的平均空隙率通过数值模拟量化。发现来自 Zuber 和 Findlay 的空隙率模型适用于交叉波纹通道,该模型经过进一步修改以用于这些类型的通道流的一般用途。
更新日期:2020-01-01
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