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首页> 外文会议>American Society of Mechanical Engineers(ASME) Summer Heat Transfer Conference(HT2005) vol.2; 20050717-22; San Francisco,CA(UA) >COMPUTATIONAL AND EXPERIMENTAL STUDY OF THE FLOW IN EVAPORATIVE CRYSTALLIZERS
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COMPUTATIONAL AND EXPERIMENTAL STUDY OF THE FLOW IN EVAPORATIVE CRYSTALLIZERS

机译：蒸发结晶器内流动的计算与实验研究

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摘要

Various evaporative-crystallization systems rely on the natural circulation generated by boiling as the only driving force for the fluid flow. The circulation resulting from the balance between the buoyancy forces of the vapor bubbles and the frictional resistance plays an important role in the convective-boiling heat transfer, and it is desired that this circulation be as high as practically possible to maximize the capacity of the equipment and to lead to high-quality product yield. Although the basic mechanisms that govern the individual processes of boiling, buoyancy, and two-phase interactions have been extensively studied in simpler geometries, their combined behavior in the complex geometry of evaporative-crystallizers and the interaction of numerous physical and chemical variables make it difficult to understand and optimize the key parameters leading to improved product yield. In the present study measurements and computations have been reported both in a lab-scale test rig and in a full-scale crystallizer in order to obtain a better understanding of the physical processes. It is observed that one of the key physical parameters that influence the circulation rate is the drag coefficient, and that, existing correlations have to be corrected for flow contamination and high void fractions to obtain reasonable agreement with measurements.
机译：各种蒸发结晶系统依靠沸腾产生的自然循环作为流体流动的唯一驱动力。由气泡的浮力与摩擦阻力之间的平衡引起的循环在对流沸腾传热中起着重要作用，并且希望这种循环尽可能地高以最大化设备的能力并导致高质量的产品产量。尽管已经在更简单的几何形状中广泛研究了控制沸腾，浮力和两相相互作用的各个过程的基本机理，但它们在蒸发结晶器的复杂几何形状中的组合行为以及众多物理和化学变量的相互作用使它很难了解和优化可提高产品产量的关键参数。在本研究中，已经在实验室规模的试验台和全尺寸结晶器中报告了测量和计算结果，以便对物理过程有更好的了解。可以观察到，影响循环速率的关键物理参数之一是阻力系数，并且必须对现有的相关性进行校正，以实现流量污染和高空隙率，从而获得与测量值的合理一致性。

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