Numerical simulation of interfacial evaporation system performance with plate substrate structure

doi:10.3785/j.issn.1008-973X.2024.07.019

Journal of ZheJiang University (Engineering Science)

2024, Vol. 58

Issue (7): 1498-1504 DOI: 10.3785/j.issn.1008-973X.2024.07.019

Numerical simulation of interfacial evaporation system performance with plate substrate structure

Sitong LI(

),Hongyu GE,Peisen KANG,Lin MU,Xiaohua LIU*(

)

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

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Abstract

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.

Key words： substrate structure interfacial evaporation slit width mass fraction of feed water evaporation rate

Received: 30 June 2023 Published: 01 July 2024

CLC:

TK 519

Fund: 大连市科技创新基金资助项目（2021JJ12GX024）；辽宁省中央引导地方科技发展专项（2021JH6/10500150）.

Corresponding Authors: Xiaohua LIU E-mail: lisitong0522@163.com;lxh723@dlut.edu.cn

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Cite this article:

Sitong LI,Hongyu GE,Peisen KANG,Lin MU,Xiaohua LIU. Numerical simulation of interfacial evaporation system performance with plate substrate structure. Journal of ZheJiang University (Engineering Science), 2024, 58(7): 1498-1504.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2024.07.019 OR https://www.zjujournals.com/eng/Y2024/V58/I7/1498

具有板式基底结构的界面蒸发系统性能模拟

针对具有板式基底结构的太阳能界面蒸发系统建立三维数学模型，利用Ansys Fluent软件求解该系统的蒸发过程，研究板缝宽度及料液质量分数对界面蒸发过程的影响. 结果表明：蒸发速率随板缝宽度和料液质量分数的增大而减小；当基底输水量小于蒸发需求时，蒸发界面出现干涸现象，干涸现象出现后蒸发速率显著降低；当板缝宽度为0.5 mm时，与最大蒸发速率对应的料液质量分数为3.5%~5.0%；当料液质量分数为3.5%时，与最大蒸发速率对应的板缝宽度为0.5~0.6 mm；系统能量利用率变化规律与蒸发速率基本一致. 蒸发过程中蒸发量与料液供给量的匹配是影响板式基底结构的太阳能界面蒸发系统性能的重要因素.

关键词： 基底结构, 界面蒸发, 板缝宽度, 料液质量分数, 蒸发速率

Fig.1 Physical model of interfacial evaporation system with plate substrate structure

Tab.1 Physical parameters of brine (T=300 K)

Fig.2 Evaporation rates for different grid counts

Fig.3 Evaporation experimental platform

Fig.4 Variation of evaporation rate with mass fraction of feed water

Fig.5 Changes in liquid film spreading during evaporation at slit width of 0.5 mm

Fig.6 Variation of evaporation rate with time at slit width of 0.5 mm

Fig.7 Pressure cloud over time near gas-liquid interface during evaporation

Fig.8 Changes in temperature distribution on evaporation platform

Fig.9 Changes in liquid film spreading during evaporation at slit width of 0.4 mm

Fig.10 Variation of evaporation rate with time at slit width of 0.8 mm

Fig.11 Dynamic characteristics of liquid film during evaporation at slit width of 0.8 mm

Fig.12 Effect of slit width on liquid film thickness （w_B=3.5%）

Fig.13 Effect of slit width on evaporation rate （w_B=3.5%）

Fig.14 Liquid film spreading during evaporation （w_B=0）

Fig.15 Variation of evaporation rate with time （w_B=0）

Fig.16 variation of evaporation rate with slit width for different mass fractions of feed water

Fig.17 variation of energy utilization with slit width for different mass fractions of feed water


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