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Head Loss in Thin-Walled Drip Tapes with Continuous Labyrinth.

Verônica G M L Melo1, Ana C S Araújo1, Antonio P Camargo2

  • 1Biosystems Engineering Department, College of Agriculture "Luiz de Queiroz" (ESALQ), University of São Paulo (USP), Piracicaba, SP, CEP 13418-900, Brazil.

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This study investigated head loss in thin-walled drip tapes, finding that operating pressure has minimal impact on diameter. Accurate head loss prediction is achievable using optimized average diameters, with 95% of models showing less than 5% error.

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Area of Science:

  • Agricultural Engineering
  • Fluid Mechanics
  • Irrigation Technology

Background:

  • Thin-walled drip tapes with continuous labyrinths are cost-effective for irrigating short-cycle crops.
  • Internal labyrinth structures and operating pressure influence head loss in these irrigation systems.
  • Accurate head loss prediction is crucial for efficient water management in drip irrigation.

Purpose of the Study:

  • To experimentally determine the friction factor and head loss in thin-walled drip tapes under varying pressures.
  • To develop and validate mathematical models for predicting head loss in continuous labyrinth drip tapes.
  • To assess the influence of operating pressure on the effective diameter of drip tapes.

Main Methods:

  • Evaluation of two commercial thin-walled drip tape models using nonperforated samples.
  • Determination of head-loss equations adjusted for flow rate and inlet pressure head.
  • Application and analysis of the Darcy-Weisbach equation, including adjustments for diameter variations and optimal average diameter.

Main Results:

  • Friction factors were accurately described by power-law models with unique coefficients for each tape type (Turbo Tape: a=0.3442, Silver Tape: a=0.3225).
  • The impact of operating pressure on the pipe diameter was found to be negligible for head loss calculations.
  • Models using an optimized average diameter provided accurate head loss predictions, with 95% of results showing <5% relative error.

Conclusions:

  • The study provides reliable mathematical models for predicting head loss in thin-walled drip tapes.
  • Neglecting the effect of operating pressure on diameter simplifies head loss calculations without significant loss of accuracy.
  • Optimized average diameters are effective for Darcy-Weisbach calculations, improving irrigation system design and performance.