Adrian Bejan I How to make a drawing , from Design in Nature

Adrian Bejan discusses flow architectures, focusing on the transition from connecting points to connecting points with an infinity of locations, represented by tree-like structures in nature. He emphasizes the importance of understanding flow direction, the growth patterns in nature, and how to create drawings to visualize these concepts.

• The direction of flow, whether inbound or outbound, is not crucial to the design challenge; the focus is on understanding and predicting flow architectures.

• Observed flow architectures are often dendritic, seen in vascular design, and serve as a key example in discussing flow designs.

• Creating a drawing requires understanding both external and internal size constraints and the aspect ratios that define the dynamic of flow architectures in nature.

• Due to constraints on variable lengths and diameters, flow architectural design has two degrees of freedom, highlighting the balance between structure and design freedom.

• The pressure drop across flow systems is crucial for understanding the dynamics of flow in various architectures. It illustrates the relationship between flow paths and their efficiencies.

• Depending on its flow direction, the same flow architecture can be described in two ways: as bifurcating branches or tributaries feeding into a larger channel.

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Umit Gunes, Ph.D.
Assoc. Prof., Yildiz Technical University
umitgunes.com