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["【每日一题】이론적 기초2

2019-03-21View Original

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选择题:螺旋形管内比直管管内流体的对流表面传热系数大是因为。( ) A. 流速提高 B. 管长增加 C. 对边界层扰动加强 D.惯性大增大 答案:C 提示:答案回复可见
Reply #22019-03-21
C. 对边界层扰动加强 
Reply #32019-03-21
因为螺旋管表面的构造可以增大流体的湍流程度,湍流程度的增大,使得传热系数增大。 所以选C. 对边界层扰动加强
Reply #42019-03-21
C. 对边界层扰动加强 
Reply #52019-03-22
C. 对边界层扰动加强
Reply #62019-03-22
C. 对边界层扰动加强

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