• Flow systems have two basic features (properties). There is the current that is flowing (for example, fluid, heat, mass, or information) and the design through which it flows.

    Adrian Bejan: Flow systems have two basic features (properties). There is the current that is flowing (for example, fluid, heat, mass, or information) and the design through which it flows.
    Adrian Bejan, J. Peder Zane (2012). “Design in Nature: How the Constructal Law Governs Evolution in Biology, Physics, Technology, and Social Organization”, p.9, Anchor