Earticle

초록

영어

Effects of artificial holes on the cooling efficiency of single grain YBCO bulk superconductors were studied. Single grain YBCO bulk superconductors without artificial holes, with six 2.4 mm holes and six holes filled with Bi-Pb-Cd-Sn metal solder were fabricated by a top-seeded melt growth process for powder compacts with/without holes. Simulation for the cooling rate to a liquid nitrogen temperature (77 K) of YBCO samples was carried out using a finite element method (FEM) and the results are compared with the actual cooling rates of samples in liquid nitrogen. The simulated cooling times for the YBCO sample without holes, with six holes and with six holes filled with the metal solder were 80, 47 and 75 sec. respectively, which are similar to the actual cooling times of 84, 52 and 78 sec. estimated for the same samples cooled in liquid nitrogen. The shorter cooling time of the sample with artificial holes are attributed to the increased surface areas associated with the presence of artificial holes. The metal filling into the holes did not give any remarkable effect on the cooling efficiency.

목차

Abstract
 1. 서론
 2. 실험방법
  2.1. 단결정 YBCO 벌크 초전도시편
  2.2. FEM 을 이용한 냉각 시뮬레이션
 3. 실험결과
 4. 결론
 참고문헌

키워드

저자

• 김광모 [ Kwang Mo Kim | 학생회원, 연세대 대학원 전기공학과 석사과정 ]
• 박순동 [ Soon-Dong Park | 정회원, 한국원자력 연구원 책임연구원 ]
• 전병혁 [ Byung-Hyuk Jun | 정회원, 한국원자력 연구원 책임연구원 ]
• 고태국 [ Tae Kuk Ko | 정회원, 연세대 전기전자공학과 교수 ]
• 김찬중 [ Chan-Joong Kim | 정회원, 한국원자력 연구원 책임연구원 ] 교신저자

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  한국초전도·저온논문지 (구 한국초전도저온공학회논문지) [Progress in Superconductivity and Cryogenics]

• 간기

  계간

• pISSN

  1229-3008

• eISSN

  2287-6251

• 수록기간

  1999~2026

• 등재여부

  KCI 등재,SCOPUS

• 십진분류

  KDC 427 DDC 537