Bio-Inspired, Low-Cost, Self-Regulating Valves for Drip Irrigation in Developing Countries
Author(s)Joshi, Abhijit; Zimoch, Pawel Jerzy; Tixier, Eliott; Hosoi, Anette E; Winter, Amos G.
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We use nonlinear behavior of thin-walled structures - an approach inspired by biological systems (the human airway, for ex- ample) - to address one of the most important problems facing subsistence farmers in developing countries: lack of access to inexpensive, water-efficient irrigation systems. An effective way of delivering water to crops is through a network of emitters, with up to 85% of the water delivered being absorbed by plants. How- ever, of the 140 million hectares of cropped land in India alone, only 61 million are irrigated and just 5 million through drip irrigation. This is, in part, due to the relatively high cost of drip irrigation. The main cost comes from the requirement to pump the water at relatively high pressure ( > 1 bar), to minimize the effect of uneven terrain and viscous losses in the network, and to en- sure that each plant receives the same amount of water. Using a prototype, we demonstrate that the pressure required to drive the system can be reduced significantly by using thin-walled structures to design emitters with completely passive self-regulation that activates at approximately 0.1bar. This reduction in driving pressure could help bring the price of drip irrigation systems from several thousand dollars to approximately $300, which is within reach of small-scale farmers. Using order-of-magnitude calculations, we show that due to increased sensitivity of the proposed design to the applied pressure differential, a pressure compensating valve for drip irrigation could be built without using costly silicone membranes.
DepartmentMIT-SUTD Collaboration; Massachusetts Institute of Technology. Department of Mathematics; Massachusetts Institute of Technology. Department of Mechanical Engineering
Volume 5: 25th International Conference on Design Theory and Methodology; ASME 2013 Power Transmission and Gearing Conference
Zimoch, Pawel J., Eliott Tixier, Abhijit Joshi, A. E. Hosoi, and Amos G. Winter. “Bio-Inspired, Low-Cost, Self-Regulating Valves for Drip Irrigation in Developing Countries.” Volume 5: 25th International Conference on Design Theory and Methodology; ASME 2013 Power Transmission and Gearing Conference (August 4, 2013).
Final published version