Example (cont.)

(a) The centerline temperature: Bi-1=2, t=1.2, from figure 9-14(a),

(TO-T?)/(Ti-T?)=0.38, (Ti-T?)=400-50=350

Center line Temp. TO(t=20 min.)=(0.38)(350)+50=183? C.

t=1.2

qo=0.38