The amount of heat per second conducted from the blood capillaries beneath the skin to the surface is 250 j/s. the energy is transferred a distance of 2.1 * 10-3 m through a body whose surface area is 1.9 m2. assuming that the thermal conductivity is that of body fat, determine the temperature difference between the capillaries and the surface of the skin.

Question

Physics

Laci Glover

29 July, 21:13

The amount of heat per second conducted from the blood capillaries beneath the skin to the surface is 250 j/s. the energy is transferred a distance of 2.1 * 10-3 m through a body whose surface area is 1.9 m2. assuming that the thermal conductivity is that of body fat, determine the temperature difference between the capillaries and the surface of the skin.

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Bronson Sawyer · Answer 1

Heat flux (i) = k. a. temp variation/d

i = 250 J/s or 250w; d = 2.1 x 10^-3m; A = 1.9m^2; K (Body Fat) = 0.2W/m. Kelvin; Temp. Var. (Delta T) = ?

-> 250 = 0.2 x 1.9 x deltaT/2.1 x 10^-3

-> 250 x 2.1 x 10^-3 = 0.38 x deltaT

-> 525 x 10^-3 = 38x10^-2 x deltaT

-> deltaT = 525 x 10^-3 / 38 x 10^-2

-> deltaT = 13.81 x 10^ (-3 - (-2))

-> deltaT = 13.81 x 10^-1

-> deltaT = 1.381 K