Study on the Radial and Axial Temperature Fields of Coal Roadway under Seasonal Fluctuation Boundary

Table 4

Calculation schemes.

Calculation Schemes	Velocity	Radius	Convective Heat Transfer Coefficient	Biot Number	Dimensionless Annual Period	Nusselt Number
	(m/s)	(m)	(W/(m^2•°C))	(Bi)	(Fo)	(Nu)
A1	0.5	3	4.46	4.12	4.56	535.44
A2	1	3	7.77	7.17	4.56	932.26
A3	3	3	18.71	17.27	4.56	2245.09
A4	5	3	28.15	25.99	4.56	3378.41
A5	7	3	36.85	34.02	4.56	4421.96
B1	3	1	23.31	7.17	41.00	932.26
B2	3	2	20.29	12.49	10.25	1623.16
B3	3	3	18.71	17.27	4.56	2245.09
B4	3	4	17.66	21.74	2.56	2826.08
B5	3	5	16.89	25.99	1.64	3378.41