Question

1. In the experiment of thermal conductivity measurements of unit 1, a group measured the heater power to be 272.37 W. At steady state, the temperatures along the metal bars were also measured. At the stainless-steel bar portion, temperatures at two points were Tsi = 553 K and Ts2 = 466 K at a distance of 0.0349 m. The cross-sectional area of the bar equals 0.0052 m . (10 points) Determine: A) Heat flux. B) Heat conductivity of stainless steel. A) How heat conductivity varies with solid materials, with the temperature of the solid and with changes in the cross-sectional area (the disk in unit 2). Refer to relevant equations. B) Possible errors during the experiment (qualitatively).

Answer 1

O=272.3 Wall Tsi=553K X=0.0349m 1 TS2 = 466K S2- © Heal plure (2) As=0.0052 m2 - 272.3. = 52365.384 W/m2 0.0052 1 g = TSI-TS2 52365. 384 = 553-466 0.0349 K S k= 21 W/m.k ox © we @- KARTE 1. kat ke 6 As Heat is not uniformely flow. These are many voids, air gasps in solids. Heat loss to surrounding.