吉林大学学报(工学版) ›› 2004, Vol. ›› Issue (3): 517-520.

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

DENG Shiqiao, REN Luquan, HAN Zhiwu   

  1. Key Laboratory for Terrain-Machine Bionics Engineering, Ministry of Education, Jilin University, Changchun 130022, China
  • Received:2004-01-14 Online:2004-07-01

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Abstract: 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.

Key words: agricultural engineering, interface, soil adhesion, capillary

CLC Number: 

  • S222
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