He was, effectively, setting the clock back in order, and all that Cronus had devoured was restored, including Rhea’s other children.Īll this marked a new era in the universe, and the gods that followed Cronus were the gods of humankind. He challenged his father, Cronus, forcing him to regurgitate the past. When Zeus grew to manhood, he knew that order had to be restored. She hid him from the clutches of his father, suspended him, as legend goes, between the earth and sky, where Cronus would not see him. His name was Zeus, and Rhea was determined he would live. Desperate, he took away her children and devoured them. Foiled by nature, Cronus watched in horror as Rhea gave birth to the future.
Things went well, at first, until Rhea decided that she too wanted children. With his head now firmly buried in the sand, Cronus took a wife, Rhea, and founded a new Kingdom. But he had overlooked the reality of his own existence, and his own potential progeny.
Intrigue and entropy cracked#
No light meant no sun, and no sun meant no time, so Cronus thought he’d cracked it. When she did, Cronus imprisoned her children in Tartarus, the abyss of perpetual darkness. So he castrated his father (understandably, one of the Greek’s most heinous acts), and sat back, satisfied that he was the sole descendant but forgetting that Gaia, the ancestral mother, would continue to give birth. If he could prevent his father from bringing forth children, the cycle of birth and rebirth would be stopped. First, he looked towards his Father, Uranus. The task of stopping Time was taken up by Cronus. Entropy informs us that Time only goes one way, and that it can’t be halted, but like many of the Greek and Roman gods, Cronus incarnated human aspirations, and one of those aspirations was the wish to gain power over Time - perhaps to even stop it altogether. The God Cronus was identified with Saturn, hence the Roman harvest feast of Saturnalia, and he gave us the word chronology, which relates to the order of Time. Nevertheless, Uranus, which was discovered and named only in 18th century when telescopes became powerful enough for the job, still mysteriously appears in the cosmological myths as the Father of the Sky. The Ancient Romans saw the wandering stars or planets as gods, although apparently only five planets were known to them at the time: Mercury, Venus, Mars, Jupiter and Saturn. Furthermore, at large Re, Model C is superior to others, because the significant improvement of TP is achieved herein with acceptable S/S 0.The Greek and Roman God of Time was Cronus. The temperature uniformity of Model D is inferior to that of Model C due to hot spots exist at the narrow split passage. Therefore, the temperature uniformity of MCHS is improved significantly with the increase of Re. However, the secondary flow generated by flow control device is not intense enough to cool down side walls when Re is small.
The varied geometry of flow control devices pushes main flow towards to side walls, and the sequential contraction and expansion area of split passage enhance the fluid exchange. As Re is larger than 500, the TP and S/S 0 of Model D both become the largest. When Re is small ( Re = 50–250), the largest TP is obtained by Model B with the smallest S/S 0. And, the S/S 0 of all MCHS maintain low at small Re, which increases quickly as Re further increases. Results show that the variation trends of TP for different MCHS increase as Re increases, and the TP of all cases ranges from 1.1 to 3.1. Then, the flow structures and heat transfer characteristics of water-cooled microchannel heat sink (MCHS) modified by the proposed devices (Model A, Model B, Model C and Model D) are investigated in laminar flow regime ( Re = 50–700).
Inspired by the shark-skin bionic concept, four novel flow control devices are proposed in this study to further enhance thermal performance ( TP) with low entropy generation ( S/S 0), as well as to improve temperature uniformity.