대조양 13번 김나래.pptx - 열전달 방법 201322572 김나래 01 열전달 02 전도 03 04 대류 열복사 열전달 방 법 01 열전달 02

대조양 13번 김나래.pptx - 열전달 방법 201322572...

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전달 방법 201322572 김나래
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01 열전달 02 전도 03 대류 04 열복사
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열전달 방 02 전도 03 대류 04 열복사 01 열전달 열전달 메커니즘 열전달의 구동력 = 온도구배 전도 , 대류 , 복사 의 세가지 방법으로 전달 높은 온도에서 낮은 온도로 이동 T 1 T 2 T 2 T 1 < 전도 T S T T S > T 대류 T 1 T 2 surface1 surface2 열복사
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열전달 방 01 열전달 02 전도 03 대류 04 열복사 전도 (conduction) ? : 열 에너지가 큰 입자로부터 에너지가 작은 입자로의 전달 액체 & 기체 고체 분자의 충돌과 확 진동과 자유전자의 이동 자유전
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열전달 방 01 열전달 02 전도 Fourier 법칙 물질 그래핀 유리 나무 공기 열전도도 (W/mK) 4800~ 5300 429 317 80 1.1 0.04~ 0.4 0.026 열전도도 (thermal conductivity)[W/mK] 순수 결정 & 금속 >>> 기체 & 단열재 열전도도는 온도에 따라 값이 변함 03 대류 04 열복사 Q = -kA con ( 면적 )( 도차 ) 두께 dT dx
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열전달 방 01 열전달 02 전도
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