This video discusses a new quieter and more efficient CPU fan developed by engineers at Sandia National Labs. As the impeller spins, it draws ambient air down the center of the impeller while the shape of the fins forces air past the fins and out radially. As the air flows over the fins, it draws heat from the CPU away. In a sense, the design combines a heat sink with a fan. (Video credit: Sandia National Labs; submitted by Adam L)
Tag: heat transfer
The Leidenfrost Effect
The Leidenfrost effect occurs when a liquid comes in contact with a mass significantly hotter than the liquid’s boiling point. Upon contact, a thin layer of the liquid will be vaporized, forming a lubricating gas layer that temporarily insulates the hot mass from the cold liquid. This effect is responsible for water skittering across a hot plate as well as protecting the hands of many a professor from a dunk in liquid nitrogen at the front of a classroom.
reblogged from fyeahchemistry:
(Thanks for the submission, singbird-sing!)