Over what distance must there be heat flow by conduction from the blood capillaries beneath the skin to the surface if the temperature difference is 0.50°C? Assume 200 W must be transferred through th

Question

Over what distance must there be heat flow by conduction from the blood capillaries beneath the skin to the surface if the temperature difference is 0.50°C? Assume 200 W must be transferred through the whole body\'s surface area of 1.5 m². Given that thermal conductivity of blood cells is 0.2 W/mK.

Answer:

0.75

Solution:

$P = \frac{k A Δ T}{d}$ , so $d = \frac{k A Δ T}{P} = \frac{0.2 \times 1.5 \times 0.5}{200} = 0.75$ mm.

TestHub · Accepted Answer

P = d k A Δ T ​ , so d = P k A Δ T ​ = 200 0.2 × 1.5 × 0.5 ​ = 0.75 mm.

Physics - Heat & Thermo Question with Solution | TestHub

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