土壤-犁壁界面毛细负压的形成和作用  

Formation of capillary negative air pressure on interface of soil-moldboard and its function

作　　者：邓石桥[1] 任露泉[1] 韩志武[1] 

机构地区：[1]吉林大学地面机械仿生教育部重点实验室,吉林长春130022

出　　处：《吉林大学学报（工学版）》2004年第3期517-520,共4页Journal of Jilin University:Engineering and Technology Edition

基　　金：教育部科学技术研究重点资助项目(02089);国家重大基础研究前期研究专项资助项目(2002CCA01200).

摘　　要：根据毛细现象的附加压强理论,解释了剪断毛细管后,管中剩余的水分处于悬浮状态这一现象;结合土壤含有丰富毛细管的事实和耕地时犁铧切断土壤毛细管的过程分析,证明了土壤 犁壁界面存在由弯月面的附加压强产生的毛细负压,同时给出了毛细负压产生的判定式。根据界面粘附功的Young Dupre方程,应用毛细负压的观点解释了水接触角大的材料和仿生非光滑表面的减粘机理。The phenomenon that the moisture in the remained capillary tube stands in suspension state after shearing off the lower capillary tube near the water surface of the basin caused by the added pressure from the capillary meniscus is explained by the theory of the capillary added pressure.According to the fact that there are plenty of capillaries in tillage soil and the plowshare cuts off the soil capillaries when cultivation, the capillary negative air pressure was produced on the interface of soil-moldboard,and its formulation was given. Based on the Young-Dupre equation on the interface adhesion work, the mechanism of reducing soil adhesion of the materials of big water contact angle and the bionic non-smooth surface could be explained from the effect of the capillary negative air pressure.

关 键 词：农业工程 界面 土壤粘附 毛细管 负压 

分 类 号：S222[农业科学—农业机械化工程]