An Experimental and Numerical Investigation of Shellside Boiling in Horizontal Tube Bundles

该研究项目旨在研究热 水平管式炉壳侧沸腾水力学 在循环液体池中以及在一次- 通过饲料系统。 实验将在现有的 使用制冷剂R-113的流动回路。 半个切片的模型 一个正方形，一条直线和一个等边三角形水平 管束的设计和构造应确保 插入壳/束几何形状可以从 釜式重沸器到一次通过浸没式重沸器 蒸发器 束中的管将被电连接。 用热电偶加热和测量。 测量将 包括压力分布、空隙率和平均值 整个管束中的液体速度， 当作为一个独立的系统运行时， 釜式再沸器、试验段功率和壁温。 一 二维、双流体数值模型 将开发水力学来模拟实验 setup. 一旦通过比较验证了该模型， 实验和预测的数据，从这个实验和 将计算机模拟与来自全世界的行业数据进行比较 规模束，然后创新的流体到流体热交换器 将被研究。 这些后来的推测性研究将 研究各种几何和操作条件。 本研究旨在开发壳侧的新数据 沸腾和两相流，并整合的结果， 两个以前的项目，以获得整体管束 性能 它将为研究创新铺平道路 不受过去热交换器实践限制的设计 与壳侧沸腾，并将展示未来 研究工作要有方向。

This research project proposes to investigate the thermal hydraulics of shellside boiling in a horizontal tube heat exchanger in a recirculating liquid pool as well as in a once- through feed system. Experiments will be run in an existing flow loop using refrigerant R-113. A model of half of a slice of a square, inline and an equilateral triangular horizontal tube bundle will be designed and constructed such that with an insert the shell/bundle geometry can be changed from that of a kettle reboiler to that of a once-through submerged evaporator. The tubes in the bundle will be electrically heated and instrumented with thermocouples. Measurements will include the pressure distribution, void fraction and mean liquid velocity throughout the bundle, liquid velocities in the space between the shell and the bundle when operating as a kettle reboiler, test section power and wall temperatures. A two-dimensional, two-fluid numerical model of the thermal hydraulics will be developed to simulate the experimental setup. Once this model has been verified by comparing the experimental and predicted data from this experiment and by comparing computer simulations against industry data from full scale bundles, then innovative fluid-to-fluid heat exchangers will be studied. These latter speculative studies will investigate a variety of geometric and operating conditions. This research is intended to develop new data on shellside boiling and two-phase flow and to integrate the results from two previous projects to obtain overall tube bundle performance. It will pave the way for studying innovative designs unconstrained by past practice for heat exchangers with shellside boiling, and will demonstrate where future research activities should be directed.