Direction: Heat is being transferred by convection from water at 48°C to a glass plate whose surface temp. is exposed to the water is at 40°C. The thermal conductivity of water is 0.6 W/mK and the thermal conductivity of glass is 1.2 W/mK. The spatial gradient of temperature in the water at the water-glass interface is dT/dy = 1 × 104 K/m.
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The heat transfer coefficient h in w/m2K is
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- 0.0
- 4.8
- 6
- 750
- 0.0
Correct Option: D
For convection Heat flux, q = h(Tf – Ti)
| q = kw |  |  | ||
| dy | w |
= 0.6 × 1 × 104 = 6000 W/m
| ∴ h = | = | = 750 W /m2K | ||
| (Tf – Ti) | 8 |
