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<p>In the present work, factors affecting fog water harvesting efficiency are studied using computational fluid dynamics (CFD) and ANSYS Fluent software. Three geometries including cylindrical, ribbon, and conical (inverted and upright) wires with the harp pattern were examined. The results showed higher efficiency in cylindrical wires (13.2%) followed by ribbon, and conical (inverted and upright) wires. Next, fog droplet size distribution (5, 10, 20, and 40&#xa0;μm and two size distributions of 1–20&#xa0;μm and 1–40&#xa0;μm), shadow coefficient (0.25, 0.40, 0.50, 0.60, and 0.75), cylindrical wire diameter (0.25, 0.5, 0.8, 1.2, 1.6 and 2&#xa0;mm), and air velocity (1, 3, 5 and 10&#xa0;m/s) were investigated. The results demonstrate that while an increase in fog droplet diameter from 5 to 40&#xa0;μm and a decrease in wire diameter from 2 to 0.5&#xa0;mm generally lead to enhanced fog water harvesting efficiency, the maximum efficiency is not necessarily achieved at the minimum wire diameter and shadow coefficient plays a key role. At a constant wire diameter and under identical environmental conditions-including fog droplet size and air velocity-maximum fog water harvesting efficiency is achieved at a shadow coefficient of approximately 0.5–0.6. Furthermore, the optimal efficiency is observed within the middle range of the laminar flow regime, i.e. Re ~ 1000.</p>

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Enhancing fog harvesting efficiency in harp collectors: a numerical investigation

  • 期刊论文

  • 发表日期：

    2026年6月25日

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  • Hamid Reza Ghorbani,
  • Seyed Farshid Chini,
  • Aliyar Javadi

摘要

In the present work, factors affecting fog water harvesting efficiency are studied using computational fluid dynamics (CFD) and ANSYS Fluent software. Three geometries including cylindrical, ribbon, and conical (inverted and upright) wires with the harp pattern were examined. The results showed higher efficiency in cylindrical wires (13.2%) followed by ribbon, and conical (inverted and upright) wires. Next, fog droplet size distribution (5, 10, 20, and 40 μm and two size distributions of 1–20 μm and 1–40 μm), shadow coefficient (0.25, 0.40, 0.50, 0.60, and 0.75), cylindrical wire diameter (0.25, 0.5, 0.8, 1.2, 1.6 and 2 mm), and air velocity (1, 3, 5 and 10 m/s) were investigated. The results demonstrate that while an increase in fog droplet diameter from 5 to 40 μm and a decrease in wire diameter from 2 to 0.5 mm generally lead to enhanced fog water harvesting efficiency, the maximum efficiency is not necessarily achieved at the minimum wire diameter and shadow coefficient plays a key role. At a constant wire diameter and under identical environmental conditions-including fog droplet size and air velocity-maximum fog water harvesting efficiency is achieved at a shadow coefficient of approximately 0.5–0.6. Furthermore, the optimal efficiency is observed within the middle range of the laminar flow regime, i.e. Re ~ 1000.