Chinese Journal of Lasers, Volume. 49, Issue 5, 0507104(2022)
Investigation on Cooling Performance and Light Attenuation Characteristics During Transient Cryogen Spray in Laser Treatment of Ota’s Nevus
Figures & Tables(10)
Fig. 3. Time-resolved surface temperature during spray cooling with different cryogens
Fig. 4. Time-resolved surface heat flux during spray cooling with different cryogens
Fig. 5. Comparison of dimensionless surface heat flux correlation and experimental results during spray cooling with different cryogens
Fig. 7. Liquid film deposition and frost formation during R-134a spray cooling at different moments. (a) 50 ms; (b) 200 ms; (c) 750 ms; (d) 1500 ms
Fig. 8. Effect of cryogen type on time-resolved light transmittance during transient spray. (a) 755 nm laser; (b) 1064 nm laser
Fig. 9. Liquid film deposition and frost formation under different cryogens. (a) R-134a; (b) R-404A; (c) R-32
Table 1. Thermophysical properties of three cryogens under conditions of 25 ℃ and 101325 Pa
View tableTable 1. Thermophysical properties of three cryogens under conditions of 25 ℃ and 101325 Pa
Property R-134a R-404A R-32 Density ρ /(kg·m－3) 1206.7 1044.1 961.0 Specific heat cp/(J·kg－1·K－1) 1424.6 1542.3 1936.7 Thermal conductivity λ /(W·m－1·K－1) 0.0811 0.0646 0.1259 Surface tension σ /(N·m－1) 0.0081 0.0046 0.0067 Viscosity ηl/(Pa·s－1) 0.00020 0.00013 0.00011 Boiling point Tb/℃ －26.1 －46.5 －51.9 Latent heat hfg/(J·kg－1) 216000 230260 270910 Saturation pressure Psat/MPa 0.67 1.25 1.69
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Jiameng Tian, Bin Chen, Zhifu Zhou, Dong Li. Investigation on Cooling Performance and Light Attenuation Characteristics During Transient Cryogen Spray in Laser Treatment of Ota’s Nevus[J]. Chinese Journal of Lasers, 2022, 49(5): 0507104
Paper Information
Received: Dec. 2, 2021
Accepted: Jan. 11, 2022
Published Online: Mar. 9, 2022
The Author Email: Chen Bin (chenbin@mail.xjtu.edu.cn)
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