1. Pump에서의 Cavitation (공동현상) 에 대하여 기술하고 이로 생길 수 있는 문제점과 그 방지책에 대해 논하시오
- Cavitation이란
유체가 넓은 유로에서 좁을 곳으로 고속 유입하거나 벽면의 요철, 만곡부 등으로 흐름이 직선적이지 못할 때 유체는 저압이 되고 포화증기압보다 낮아지면 기화되어 기포가
■ 소결부품의 적용 이력
주로 오일레스 베어링과 간단한 기계부품을 생산하던 국내 분말업계는 1970 년대의 산업의 발전과 1980 년 대 자동차 공업의 발전으로 비약적인 발전을 거듭한 결과 현재는 20,000 ton 정도를 생산하고 있으며 , 응용분 야의 적용비율도 수송기계 78%, 전기기기 12%, 산업기계 8%, 기
Steam escapes upwards. The machine immediately
slows down. Da Vinci oh-so-gently coughs and moves for-
ward with tongs.
A LITTLE TROUGH - IN THE MACHINES INNARDS
comes to a trembling, mystical halt. Right behind this
trough is a CONPLEX POLYHEDRON CRYSTAL as intricately
modulated as any Rubik stocking stuffer, but much more
dazzling in beauty. It gleams like a jewel in the yellow
glow which pours
SEDAN fishtails into a parked Toyota. Utah bounces
forward, slamming into the asphalt. Glass shards and
crushed steel are strewn everywhere, as radiator steam
whistles hot.
Pig Nose #2, riding shotgun, is trapped. Cant get his
crushed door open. The DRIVER pushes open her door.
Gropes for her pistol. Utah springs -- no respect for a
lady. He slams the door, pins her arm and slams again and
steam vents in Italy, and large quantities of ammonia were produced from Chile saltpeter (sodium nitrate, or NaNO3), which is mined in South American deserts. Around the turn of the twentieth century, Sir William Crookes predicted that the world would soon run short of Chile saltpeter. Scientists feared that without nitrogen-based fertilizers to increase crop yields, the growing world population