Table 1.

Characteristics of drip for different wire configurations.

Case	1	2	3	4	5	6
core material	No core		SS		Cu
core diameter, dc (mm)	3.5	5.5	3.5	5.5	3.5	5.5
outer diameter, do (mm)	8.0	9.0	8.0	9.0	8.0	9.0
thickness of PE tube, δp (mm)	2.25	1.75	2.25	1.75	2.25	1.75
mass of drip, ${\overline{M}}_{dr}$ (mg)	2.5 ± 0.2	2.6 ± 0.2	3.0 ± 0.2	4.1 ± 0.5	4.6 ± 0.4	5.0 ± 0.4
diameter of drip, $\overline{D}$ (mm)	1.9 ± 0.2	1.9 ± 0.2	2.1 ± 0.2	2.3 ± 0.2	2.5 ± 0.3	2.6 ± 0.3
bulk density, ρdr (kg/m3)	700	702	620	640	560	540
porosity, ψ = ρdr/ρPE (−)	0.73	0.75	0.64	0.67	0.59	0.57
extinction height, ${\overline{H}}_{ex}$ (cm)	20	22	33	38	40	42
probability of flame attachment, Pf	0%	0%	20%	39%	56%	67%
terminal velocity, VT,cal (m/s)	3.6	3.6	3.8	3.9	4.1	4.2