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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Application of fluid dynamic gauging to annular test apparatuses for studying fouling and cleaning
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Application of fluid dynamic gauging to annular test apparatuses for studying fouling and cleaning

机译：流体动力学测量在环形测试设备中研究结垢和清洁的应用

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摘要

Fluid dynamic gauging (FDG) is a non-contact technique for measuring the thickness and strength of fouling layers immersed in liquid in situ. Its application to an annular geometry across a range of possible flow conditions, from stagnant to turbulent flow regimes (annulus Reynolds number ～29,000), is demonstrated. Two modes of measurement are demonstrated: in the first, the pressure drop across the nozzle is fixed and the mass flow rate of liquid withdrawn through the gauge is measured. In the second, the mass flow rate of liquid is fixed and the pressure drop measured: the latter is a new mode of measurement and it is shown to perform equally well, with advantages for particular applications. The results were not affected significantly by the surface under study being heated, indicating that the technique is suitable for measuring deposit thicknesses in situ during fouling and cleaning experiments in annular devices which are commonly used in deposition studies. Computational fluid dynamics (CFD) simulations, which afford detailed information about the flow patterns and shear stresses imposed on the surface, showed good agreement with experimental data for tests in the laminar regime: simulation of the transitional and turbulent regimes was not attempted. A short study of whey protein fouling recorded mixed success owing to the softness of the deposit, but demonstrated the scope for FDG to monitor the development of fouling layers in these geometries.
机译：流体动态计量（FDG）是一种非接触式技术，用于测量原位浸入液体中的污垢层的厚度和强度。证明了其在从停滞到湍流状态（环雷诺数〜29,000）的各种可能的流动条件下应用于环形几何形状的应用。演示了两种测量模式：第一种是固定喷嘴两端的压降，并测量通过压力表抽取的液体的质量流量。在第二种方法中，液体的质量流量是固定的，并且要测量压降：后者是一种新的测量模式，并且表现出同样出色的性能，对于特定应用具有优势。结果并未受到被加热表面的明显影响，表明该技术适用于在沉积研究中常用的环形设备的结垢和清洁实验过程中现场测量沉积物厚度。计算流体动力学（CFD）仿真提供了有关流型和施加在表面上的切应力的详细信息，与层流状态下的试验数据吻合良好：未尝试模拟过渡状态和湍流状态。一项简短的乳清蛋白结垢研究表明，由于沉积物的柔软性，取得了不同的成功，但证明了FDG可以监控这些几何结构中结垢层的发展。

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