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Air at 20 degree Celsius flows over a flat surface maintained at 80 degree Celsius. Estimate the value of local heat transfer coefficient if the local heat flow at a point was measured as 1250 W/m2. Take thermal conductivity of air as 0.028 W/m K
  • a)
    23.83 W/m 2 K
  • b)
    22.83 W/m 2 K
  • c)
    21.83 W/m 2 K
  • d)
    20.83 W/m 2 K
Correct answer is option 'D'. Can you explain this answer?
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Air at 20 degree Celsius flows over a flat surface maintained at 80 de...
Q = h A (t s – t infinity).
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Air at 20 degree Celsius flows over a flat surface maintained at 80 de...
Calculation of Local Heat Transfer Coefficient

Given data:
- Air temperature, T∞ = 20°C
- Surface temperature, Ts = 80°C
- Local heat flow, q'' = 1250 W/m²
- Thermal conductivity of air, k = 0.028 W/mK

We can use the following equation to estimate the local heat transfer coefficient, h:

q'' = h × (Ts - T∞)

Rearranging the equation, we get:

h = q'' / (Ts - T∞)

Substituting the given values:

h = 1250 / (80 - 20)
h = 20.83 W/m²K

Therefore, the estimated value of local heat transfer coefficient is 20.83 W/m²K.

Answer: Option D (20.83 W/m²K)
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