A Mathematical Model for Pressure Compensating Emitters

Katherine A. Taylor, Pulkit Shamshery, Ruo-Qian Wang, Amos G. Winter V

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This paper presents a mathematical model investigating the physics behind pressure-compensating (PC) drip irrigation emitters. A network of PC emitters, commonly known as drip irrigation, is an efficient way to deliver water to crops while increasing yield. Irrigation can provide a means for farmer to grow more sensitive, and profitable crops and help billions of small-holder farmers lift themselves out of poverty. Making drip irrigation accessible and economically viable is important for developing farmers as most face the challenges of water scarcity, declining water tables and lack of access to an electrical grid. One of the main reasons for the low adoption rate of drip irrigation in the developing world is the relatively high cost of the pumping power. It is possible to reduce this cost by reducing the required activation pressure of the emitters, while maintaining the PC behavior. The work presented here provides a guide of how design changes in the emitter could allow for a reduction in the activation pressure from 1 bar to approximately 0.1 bar. This decrease in the activation pressure of each emitter in turn decreases the system driving pressure. This reduction of driving pressure will decrease the energy need of pumping, making a solar-powered system affordable for small-acreage farmers.

This paper develops a mathematical model to describe the PC behavior in a commercially available emitter. It is a 2D model that explains the relationship between the pressure, structural deformation and fluid flow within a PC emitter. A parametric study has been performed to understand the effects of geometric and material parameters with regards to the activation pressure and PC behavior. This knowledge will help guide the designs and prototypes of optimized emitters with a lower activation pressure, while also providing the PC behavior.
Original languageEnglish
Title of host publicationASME Proceedings
Subtitle of host publication41st Design Automation Conference
PublisherAmerican Society of Mechanical Engineers
Number of pages10
ISBN (Print)9780791857076
Publication statusPublished - 2015
EventASME 2015 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference - Boston, United States
Duration: 2 Aug 20155 Aug 2015


ConferenceASME 2015 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference
Abbreviated titleIDETC/CIE 2015
Country/TerritoryUnited States
Internet address


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