降落液膜传热特性的组合实验和计算研究

2019/07/23   下载量： 0 次

方案摘要

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应用领域 石油/化工
检测样本 其他
检测项目 老化性能>耐湿热性
参考标准 暂无

采用LaVisin公司DaVis软件平台为核心搭建了平面激光诱导荧光（PLIF), 粒子跟踪测速，以及红外测温平台。利用这一测量平台对降落液膜传热特性进行了实验和计算研究

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方案详情

      An optical technique that combines planar laser-induced fluorescence (PLIF), particle tracking velocimetry (PTV) and infrared thermography (IR) was applied for the investigation of the hydrodynamic and heat transfer characteristics of harmonically-excited liquid films falling under the action of gravity over an inclined, electrically heated glass-substrate. PLIF was used to recover film-height data, PTV to recover two-dimensional (2D) velocity-field data, and IR to recover the temperature of the gas-liquid interface. The experiments were complemented by direct numerical simulations (DNSs) that provide additional information on the liquid viscosity, temperature and velocity distributions between the flow inlet and the downstream location where the optical measurements were collected. By adoption of this synergistic approach we recover a wealth of information, including novel results on the spatiotemporal evolution of the interface topology, and the flow and temperature fields underneath the wavy interface. Based on this data we also deduce local and instantaneous
heat transfer coefficients (HTCs), and focus our efforts towards the investigation of two HTC-enhancement mechanisms; the observation of “hot-spots” as precursors to the formation of thermal rivulets, which can result in local enhancements in excess of 50%, and the presence of large velocity components in the crossstream direction of the flow, which promote mixing and are shown to improve heat transfer by up to  7% compared to flow regions of the same height.

上一篇 在一个双稳湍流涡旋火焰中，对间歇性动态的时间-频率定位
下一篇 醇类全局和局部湍流预混火焰特性的实验研究

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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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