Application of Sheath Flow Technique in Aerosol Particle Sensor

Parameter	Value
Carrier gas nozzle diameter d /mm	1
Sheath gas nozzle diameter d₂ /mm	3
Inclination angle θ /(°)	45
Wall thickness s /mm	0.3
Carrier gas velocityU₀(1 L/min) /(m·s^-1)	21.22
Sheath gas velocityU_sheath(3 L/min) /(m·s^-1)	9.88
Carrier and sheath gas	Air
Particle diameter d_m /μm	0.5
Particle density ρ /(kg·m^-3)	1040 (polystyrene)
Particle mass flow rate m /(kg·m^-3)	5×10^-5

Table 3. Calibration results of absolute concentration vale of 0.5 μm standard particles in calibration process

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Table 3. Calibration results of absolute concentration vale of 0.5 μm standard particles in calibration process

Type	Particlesize /μm	Concentration /(particle·L^-1)							$\begin{matrix} \frac{N_{0.5}}{N_{0.3}} \end{matrix}$ /%	>0.5 μm(PMS)
Type	Particlesize /μm			1	2	3	4	5	6	Average
1.0 mmsheath jet	>0.3	2119	2123	2277	2128	2073	2064	2130.67
	>0.5	1063	1038	1123	1088	1050	1041	1067.17	50.1	1089
ϕ0.5 mm jet	>0.3	2064	2177	2096	2284	2156	2203	2163.33
	>0.5	1076	1140	1156	1148	1075	1100	1115.83	51	1145
ϕ1.0 mm jet	>0.3	2241	2218	2347	2277	2413	2353	2308.16
	>0.5	1121	1120	1202	1145	1212	1189	1164.83	50.5	1194

Table 4. Calibration results of absolute concentration vale of 0.3 μm standard particles in calibration process

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Table 4. Calibration results of absolute concentration vale of 0.3 μm standard particles in calibration process

Type	Particlesize /μm	Concentration /(particle·L^-1)							$\begin{matrix} \frac{N_{0.5}}{N_{0.3}} \end{matrix}$ /%
Type	Particlesize /μm		1	2	3	4	5	6	Average
1.0 mm sheathflow jet	>0.3	1014	942	912	984	970	964	964.33
	>0.5	156	138	168	156	150	152	154.33	16
ϕ0.5 mm jet	>0.3	1056	1017	1120	1001	1098	1053	1057.5
	>0.5	200	190	182	176	200	189	189.5	17.9
ϕ1.0 mm jet	>0.3	1200	1014	1160	1108	1068	1014	1094
	>0.5	204	194	192	198	196	188	196	18.9

Table 5. Saturation measurement concentration ranges of three jets
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Table 5. Saturation measurement concentration ranges of three jets
Jet type Saturation measurementconcentration /(particle·L^-1)
ϕ1.0 mm jet 5000-10000
ϕ0.5 mm jet 10000-14000
ϕ1.0 mm sheath flow jet(core diameter 0.34 μm) 15000-23000

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Lu Chenyang, Zhang Pei, Wang Guanghui, Zhu Jing, Huang Huijie. Application of Sheath Flow Technique in Aerosol Particle Sensor[J]. Chinese Journal of Lasers, 2019, 46(1): 104006

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