ABSTRACT

A new variant of the fluid dynamic gauging technique for determining the thickness of soft fouling layers in situ and in real time is reported. The sideways fluid dynamic gauging (SiDG) device allows measurements to be made shortly after a deposit layer contacts a solution, allowing processes such as swelling to be characterized accurately. Two applications of the device are reported: (i) in cleaning, monitoring the change of thickness of a complex food soil when it is contacted with aqueous solutions at different temperatures, pH and surfactant content, and (ii) in fouling, in determining the thickness, thermal conductivity and strength of deposits generated from whey protein solutions on heated stainless steel substrates. The evolution of fouling resistance for the whey protein deposits indicates that significant ageing takes place during the fouling test, which is confirmed by changes in the thermal properties and strength of the deposit layer as measured by the SiDG device.

摘要

报告了一种用于原位和实时确定软污垢层厚度的流体动力学测量技术的新变体。侧向流体动态测量 (SiDG) 设备允许在沉积层接触溶液后不久进行测量，从而可以准确表征溶胀等过程。报告了该装置的两个应用：（i）在清洁、监测复杂食物污垢与不同温度、pH 值和表面活性剂含量的水溶液接触时的厚度变化，以及（ii）) 在结垢方面，用于确定加热不锈钢基材上乳清蛋白溶液产生的沉积物的厚度、热导率和强度。乳清蛋白沉积物抗污染性的演变表明，在污染测试期间发生了显着的老化，这通过 SiDG 设备测量的沉积层的热性能和强度的变化得到证实。