School of Energy and Power Engineering, Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian 116024, China
A three-dimensional mathematical model was established for a solar interfacial evaporation system with a plate substrate structure, and the evaporation process of the system was solved using Ansys Fluent software. The effects of the slit width and mass fraction of feed water on the interfacial evaporation process were investigated. Results show that the evaporation rate decreases with the increase of slit width and mass fraction of feed water. The evaporation interface dries up, and the evaporation rate decreases significantly when the substrate water delivery is less than the evaporation demand. When the slit width is 0.5 mm, the mass fraction of feed water corresponds to the maximum evaporation rate is 3.5% to 5.0%. When the mass fraction of feed water is 3.5%, the slit width corresponds to the maximum evaporation rate is 0.5 mm to 0.6 mm. The pattern of change in the energy utilization of the system is basically the same as the evaporation rate. The matching of evaporation rate and feed water supply during the evaporation process is one of the important factors affecting the performance of solar interfacial evaporation systems with plate substrate structure.
Fig.1Physical model of interfacial evaporation system with plate substrate structure
wB/%
ρ/(kg?m?3)
λ/(W?m?1?K?1)
μ/(kg?m?1?s?1)
Cp/(J?kg?1?K?1)
σ/(N?m?1)
0
996.4
0.613
0.854×10?3
4 185.6
71.686×10?3
3.5
1 023.0
0.611
0.920×10?3
4 001.5
72.789×10?3
5.0
1 034.4
0.610
0.953×10?3
3 928.1
73.262×10?3
7.0
1 049.6
0.609
1.000×10?3
3 835.3
73.892×10?3
13.0
1 095.2
0.606
1.168×10?3
3 592.1
75.783×10?3
Tab.1Physical parameters of brine (T=300 K)
Fig.2Evaporation rates for different grid counts
Fig.3Evaporation experimental platform
Fig.4Variation of evaporation rate with mass fraction of feed water
Fig.5Changes in liquid film spreading during evaporation at slit width of 0.5 mm
Fig.6Variation of evaporation rate with time at slit width of 0.5 mm
Fig.7Pressure cloud over time near gas-liquid interface during evaporation
Fig.8Changes in temperature distribution on evaporation platform
Fig.9Changes in liquid film spreading during evaporation at slit width of 0.4 mm
Fig.10Variation of evaporation rate with time at slit width of 0.8 mm
Fig.11Dynamic characteristics of liquid film during evaporation at slit width of 0.8 mm
Fig.12Effect of slit width on liquid film thickness （wB=3.5%）
Fig.13Effect of slit width on evaporation rate （wB=3.5%）
Fig.14Liquid film spreading during evaporation （wB=0）
Fig.15Variation of evaporation rate with time （wB=0）
Fig.16variation of evaporation rate with slit width for different mass fractions of feed water
Fig.17variation of energy utilization with slit width for different mass fractions of feed water
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