Mathematical Model of a Flash Drying Process

Table 8

Heat transferred per second to a particle of diameter 𝑠, h(s), in a gas of temperature 618°C, and the corresponding surface thermal resistance, 𝑅_𝑠, and internal coal resistance, 𝑅_𝑐, as well as the ratio 𝑅_𝑠/𝑅_𝑐.

𝑠 (mm)	h(s) (W)	𝑅𝑠 (°C/W)	𝑅𝑐 (°C/W)	𝑅𝑠/𝑅𝑐
3	4.5913	85	83	1.02
1.5	1.6102	241	167	1.45
0.75	0.5534	703	333	2.11
0.375	0.1982	1962	667	2.94
0.1875	0.0734	5295	1333	3.97
0.09375	0.0274	14211	2667	5.33
0.046875	0.0107	36313	5333	6.81
0.023438	0.0046	84018	10666	7.88