Film coefficient is defined as Inside diameter of tube

A Equivalent thickness of film
B Thermal conductivity Equivalent thickness of film Specific heat × Viscosity
C Thermal conductivity Molecular diffusivity of momentum Thermal diffusivity
D Film coefficient × Inside diameter Thermal conductivity

Correct Answer: Thermal conductivity Equivalent thickness of film Specific heat × Viscosity

Film coefficient is defined as Inside diameter of tube Thermal conductivity Equivalent thickness of film Specific heat × Viscosity
Bissoy MCQ
#Mechanical Engineering #Heat And Mass Transfer

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In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by
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B Radiation
C Conduction
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A Less than
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C 2.5 times
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A More
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A 1.25
B 1.75
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A More heating surface
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A d
B $$\frac{1}{{\text{d}}}$$
C $$\sigma $$
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In a shell and tube heat exchanger having square pitch, the shell side equivalent diameter is given by (where, P = pitch, d = outside diameter of the tube)
A $$\frac{{4\left( {{{\text{p}}^2} - \pi {{\text{d}}^2}/4} \right)}}{{\pi {\text{d}}}}$$
B $$\frac{{{{\text{p}}^2} - \pi {{\text{d}}^2}/4}}{{\pi {\text{d}}}}$$
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