以风送静电喷雾系统为研究对象,通过在三维坐标系下建立雾滴沉降运动及黏附受力模型,分析了静电喷雾中的荷电特征因素对雾滴沉降、沉积和黏附靶标的影响。通过开展室内树木靶标模拟喷雾试验及雾滴静态接触角和表面张力测试,分析对比了静电喷雾和非静电喷雾条件下雾滴的沉积分布效果及黏附特性。结果表明:雾滴荷电可以增加雾滴的沉降速度,并定向向着靶标运动沉降,靶标正面沉积覆盖率较非静电喷雾平均提高了24个/cm2,而且在靶标背面也有一定数量的沉积,同时静电作用可以减小雾滴与叶片的接触角,减小液滴表面张力,提高雾滴在植株表面的有效沉积率。
Abstract
The wind electrostatic spraying system was as the study object, and the settlement movement of droplets and adhesion force model were established using three-dimensional coordinate system in this paper. Mechanism on electrostatic spray effecting droplet moving, droplet deposition and droplet adhesion characteristics were discussed. Through spraying of simulation of trees target test, surface contact angle and tension of droplets tests, droplet distribution and charged droplet effect on adhesion characteristics under electrostatic spraying or non-static effects of spray were analyzed. According to the results, charged droplet could increase the settling velocity of droplets, and the droplets would run and deposited towards the target, average deposit cover rate on the front of target increased by 24 /cm2, and there was a considerable number of deposits on the back of the target. Electrostatic spray could reduce the contact angle between the droplet and leaves, decrease gas-liquid interfacial surface tension. So it could improve effect of the droplet depositing on plant surface.
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基金
收稿日期:2013-05-19 修回日期:2013-12-06
基金项目:江苏省自然科学基金面上项目(BK20131422); “十二五”农村领域国家科技计划(2012BAD19B08); 江苏省高校优秀中青年教师和校长境外研修项目; 江苏高校优势学科建设工程资助项目(PAPD)
第一作者:茹煜,副教授,博士。E-mail: superchry@163.com。
引文格式:茹煜,金兰,周宏平,等. 雾滴荷电特性对其沉积分布及黏附靶标的影响[J]. 南京林业大学学报:自然科学版,2014,38(3):129-133.
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