2013년 전문지식 오전 28번 문제
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28. 대류열전달에서, 열전달 추동력 △tm이 두 배로 증가할 경우, 원형 직관의 강제 난류 조건 하에서(전체 열전달 계수와 물성의 영향은 고려하지 않음), 열전달 속도가 증가하는 배수는 다음 중 어떤 값인가?A.2 B.1 C.4 D.8 어떻게 풀까요?？
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