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For film wise condensation on a vertical plane, the film thickness δ and heat transfer coefficient h vary with distance x from the leading edge as
  • a)
    δ decreases, h increases
  • b)
    Both δ and h increases
  • c)
    δ increases, h decreases
  • d)
    Both δ and h decreases
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
For film wise condensation on a vertical plane, the film thickness &de...
Thickness increases and heat transfer coefficient decreases.
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For film wise condensation on a vertical plane, the film thickness &de...
Decreases as the liquid flows downwards due to gravity. This results in an increase in the film velocity and a decrease in the film surface area, leading to an increase in the heat transfer coefficient. The film thickness can be calculated using the governing equations of film condensation, which are based on the conservation of mass, momentum, and energy. The film thickness is also affected by the properties of the fluid and the surface, including surface tension, viscosity, and surface roughness. In general, thinner films result in faster heat transfer rates, but there is a limit to how thin the film can become before it breaks up or becomes unstable.
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For film wise condensation on a vertical plane, the film thickness δ and heat transfer coefficient h vary with distance x from the leading edge asa)δ decreases, h increasesb)Both δ and h increasesc)δ increases, h decreasesd)Both δ and h decreasesCorrect answer is option 'C'. Can you explain this answer?
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