Fig. 2 Transient dimensionless temperature difference between the downstream and upstream sensors (Eq. [18]) for a range of heat pulse velocities with 
= 6.0 x 10-7 m2 s-1, xd = xu = 0.006 m, and t0 = 15 s
Fig. 2 Transient dimensionless temperature difference between the downstream and upstream sensors (Eq. [18]) for a range of heat pulse velocities with = 6.0 x 10-7 m2 s-1, xd = xu = 0.006 m, and t0 = 15 s