【Daily Question】Theoretical Foundation 2019.3.21

2019-03-21View Original

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Multiple-choice question: The convective surface heat transfer coefficient of the fluid inside a spiral tube is greater than that inside a straight tube because. ( ) A. Increased flow velocity B. Increased pipe length C. Enhanced disturbance of the boundary layer D. Greatly increased inertia Answer: C Hint: The answer can be seen upon response

Reply #22019-03-21

C. Enhancement of boundary layer perturbations

Reply #32019-03-21

This is because the structure of the spiral tube surface can increase the turbulence level of the fluid, and an increased turbulence level leads to a higher heat transfer coefficient. So choose C. Strengthen the boundary layer perturbations

Reply #42019-03-21

C. Enhancement of boundary layer perturbations

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【Daily Question】Theoretical Foundation 2019.3.21

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