Consider steady-state conditions for one-dimensional conduction in a plane wall having a thermal conductivity k = 40 W/m-K and a thickness L= 0.35 m, with no internal heat generation. Case 1 Determine the heat flux, in kW/m2, and the unknown quantity for each case. 2 3 4 5 i 68 i -40 T₁ (°C) 50 -30 70 T₁ i 126 T₂(°C) -20 -10 40 L 30 -T₂ i dT/dx(k/m) -200 i 57.142 160 -80 200 i i i 8 q (kW/m²) -2.285 -6.4 i 3.2 i -8

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Q: and k =43 W/m-K, respectively. The time required for the rod to reach 300 °C is seconds.

A: Given data;   d=0.01mL=0.2mTi=7500cTa=1000Ch=250 W/m2Kρ=7801 kg/m3Cp=473 j/kgKk=43W/m/kt=300 0c

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.