At equal mass velocities, the values of film co-efficients for gases as compared to that for liquids are generally ?
Correct answer: B. Lower
- A. Higher
- B. Lower
- C. Same
- D. Unpredictable
Explanation
At equal mass velocity, gases generally have much lower film coefficients because their thermal conductivity and density are far lower than those of liquids. Consequently, gas-side heat or mass films offer greater resistance and have lower coefficients.
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