1. Reference:
Bejan, Adrian. (2011, June.). Animals spinning their wheels. Mechanical Engineering 133, 2. Retrieved June 22, 2011, from Academic Search Premier.
Summary:
This article shows that the emergence of body organs is predictable as a part of the design for moving animal mass more easily on Earth, in accord with the constructal law of design in nature. For a finite-size open system to persist in time (to live), it must evolve such that it provides easier access to the imposed (global) currents that flow through it. Does the constructal theory then state that for a design (an animal, a river basin) to persist in time, it must evolve to move more freely through its environment? Yes. “The theory goes on to show us that forward-falling movement is dictated by the natural wheel phenomenon, which is required for the minimal amount of effort expended for a certain distance traveled,” Bejan said. The constructal law also accounts for animal design features for changing speeds. Skeletons (bones and legs) are solid organs that emerge in accordance with the constructal-law design of moving animal mass: More and stronger material emerges along the lines of highest stresses. What do I think? Well, I believe that flows evolve to reduce friction or other forms of resistance, so that they flow more easily with time. It is no surprise that animals and humans alike, must evolve to meet the growing and faster speeds of the world we live in. The main principle of the constructal theory is that every system is destined to remain imperfect. As a consequence, a perfect form is the least imperfect form possible and constitutes the best outcome available. Adrian Bejan believed that more and stronger material emerges along the lines of highest stresses. A connection, thus, between animal wheel movement and swimming, water waves, and tsunamis has been made. What’s next? Only time will tell.
Reaction:
I would like to compare this article with a piece of chocolate that has a good shape because this article makes me eager to read it all. In fact, this article gives me much information, which I hadn’t known about before. For example, it has a brief reminder of why the wheel was such a dramatic change in how human move which makes me understand it all. In addition, as I am planning to study mechanical engineering, I must know what the most important and the fundamental things to notice everything happens around me, such as A, Bejan, who has been researching for a long time. We can realize what he is studying for fast. In the world, many companies require the ambitious man who works not only for himself, but also for the word. For this reason, I would study hard, and work hard to be famous and well known in this world. In short, I am studying mechanical engineering because I like challenging, and complicated search like what A, Bejan has been doing.