ABSTRACT

Due to external thermal and mechanical stress on proteinaceous fouling layer, a progressive material change, the so-called aging, occurs, which influences both the thermal and mechanical properties. This paper presents a systematic classification of morphological, thermal, and mechanical aging phenomena. The thermal aging of proteinaceous deposits is discussed based on the thermal characterization of fouling experiments. Therefore, differently aged food-based fouling layers from whey protein concentrate solutions are generated in a heated, laminar-operating flow channel. Both, a time dependency and a temperature dependency of the aging process become apparent. The impact of morphological aging and possible temperature-dependent reactions is discussed.

摘要

由于蛋白质污垢层上的外部热应力和机械应力，会发生渐进的材料变化，即所谓的老化，这会影响热性能和机械性能。本文对形态、热和机械老化现象进行了系统分类。基于结垢实验的热表征讨论了蛋白质沉积物的热老化。因此，在加热的层流操作流道中会产生来自浓缩乳清蛋白溶液的不同老化的基于食品的污垢层。老化过程的时间依赖性和温度依赖性都变得明显。讨论了形态老化和可能的温度依赖性反应的影响。