Review of Theories and a New Classification of Tortuosity Types

Abstract Many different definitions of tortuosity can be found in literature. In addition, also many methodologies are nowadays available to measure or calculate tortuosity. This leads confusion and misunderstanding scientific discussions the topic. this chapter, a thorough review all relevant types is presented. Thereby, underlying concepts, associated theories discussed detail for each type separately. total, more than 20 distinguished chapter. order avoid misinterpretation data misunderstandings discussions, we introduce new classification scheme tortuosity, as well systematic nomenclature, which helps address inherent differences clear efficient way. Basically, grouped into three main categories, (a) indirect physics-based tortuosities, (b) direct geometric tortuosities (c) mixed tortuosities. Significant among these detected, when applying methods concepts same material microstructure. The present involved shall serve basis better understanding differences. proposed nomenclature contribute precise unequivocal descriptions