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    • 15. 发明授权
    • Method for measuring the rate of a fouling reaction induced by heat transfer using a piezoelectric microbalance
    • 使用压电微量天平测量由热传导引起的结垢反应速率的方法
    • US06250140B1
    • 2001-06-26
    • US09338669
    • 1999-06-22
    • Dmitri KouznetsovLouis DiSantoDonald JohnsonPaul R. KrausBarbara E. Moriarty
    • Dmitri KouznetsovLouis DiSantoDonald JohnsonPaul R. KrausBarbara E. Moriarty
    • G01N1702
    • G01N29/036G01N17/008G01N2291/0256
    • A method measuring a rate of fouling caused by a heat flux through the surface subjected to electrochemical polarization. The method includes the steps of: providing a piezoelectric microbalance comprising a piezoelectric material with electrodes disposed thereon; exposing the working electrode of the microbalance to a flowing liquid, the liquid containing at least one fouling forming species; maintaining the liquid at a constant first temperature; maintaining the liquid at required hydrodynamic conditions; applying either a constant heat flux through the microbalance resulting in its working electrode having a variable second temperature or applying a variable heat flux through the microbalance resulting in its working electrode having a constant second temperature; and measuring a rate of fouling on the microbalance surface. The method also comprises measuring the surface density and heat transfer resistance of the deposit independently, thereby the corresponding ratio can be determined contributing to the deposit identification. The working electrode of the microbalance can be subjected to an electrochemical polarization in a wide range to systematically simulate the conditions of heat exchange surface produced by corrosion or other electrochemical processes. The possibility to apply electrochemical polarization, cooling or heating flux in the direction opposite to that causing fouling can be used to clean the immersed microbalance surface in-situ.
    • 测量由经过电化学极化的表面的热通量引起的结垢速率的方法。 该方法包括以下步骤:提供包括其上布置有电极的压电材料的压电微量天平; 将微量天平的工作电极暴露于流动的液体中,该液体含有至少一种结垢形成物质; 将液体保持在恒定的第一温度; 将液体保持在所需的流体动力学条件下; 施加恒定的热通量通过微量天平,导致其工作电极具有可变的第二温度或者通过微量天平施加可变的热通量,导致其工作电极具有恒定的第二温度; 并测量微量平衡表面上的结垢率。 该方法还包括独立地测量沉积物的表面密度和传热阻力,从而可以确定相应的比例有助于沉积物识别。 微量天平的工作电极可以在宽范围内进行电化学极化,以系统地模拟由腐蚀或其他电化学过程产生的热交换表面的条件。 在与引起结垢的方向相反的方向上施加电化学极化,冷却或加热助焊剂的可能性可用于原位清洁浸没的微量平衡表面。