tailieunhanh - Development of a mathematical model using dimensional analysis for predicting the friction losses in drip irrigation laterals with cylindrical type in-line emitters

This paper presents a prediction model developed using dimensional analysis for friction losses in drip irrigation laterals. Drip irrigation laterals with cylindrical type in-line emitters placed at different spacings ranging from to 1 m were considered. | Turk J Agric For 28 (2004) 101-107 © TÜB‹TAK Development of a Mathematical Model Using Dimensional Analysis for Predicting the Friction Losses in Drip Irrigation Laterals with Cylindrical Type In-Line Emitters Vedat DEM‹R*, Hüseyin YÜRDEM, Adnan DE⁄‹RMENC‹O⁄LU Department of Agricultural Machinery, Faculty of Agriculture, Ege University, 35100, ‹zmir - TURKEY Received: Abstract: This paper presents a prediction model developed using dimensional analysis for friction losses in drip irrigation laterals. Drip irrigation laterals with cylindrical type in-line emitters placed at different spacings ranging from to 1 m were considered. The parameters affecting the variation in friction losses in laterals were defined as dimensionless terms using Buckingham’s pi theorem. In order to develop a model, experimental friction loss data from 14 different drip irrigation pipes, and some domestic and some imported ones with the above-mentioned spacings were used. The model developed in this study accounted for of the variation in the data. The results showed that the mathematical model may be used to determine friction losses in drip laterals with cylindrical type in-line emitters with spacings ranging from to 1 m. Key Words: Drip irrigation, emitters, friction loss, mathematical model, dimensional analysis ‹çine Geçik Silindirik Tip Damlat›c›l› Damla Sulama Borular›ndaki Sürtünme Kay›plar›n›n Kestiriminde Kullan›labilecek Bir Matematiksel Modelin Boyutsal Analiz Yöntemiyle Gelifltirilmesi Özet: Bu çal›flmada, damla sulama laterallerinde oluflan sürtünme kay›plar›n›n tahmininde kullan›labilecek bir matematiksel modelin gelifltirilmesi amaçlanm›flt›r. Matematiksel modelin gelifltirilmesinde boyutsal analiz yöntemi kullan›lm›flt›r. Çal›flmada, silindirik tip içine geçik damlat›c›lar›n - 1 m aras›nda de¤iflen aral›klarda yerlefltirildi¤i damla sulama borular› ele al›nm›flt›r. Borularda sürtünme kay›plar›n›n de¤iflimine neden olan parametreler, .

• Nông nghiệp
• Drip irrigation
• Friction loss
• Drip irrigation laterals
• Mathematical model
• Dimensional analysis
• Saline water
• Salt dynamics
• Cabbage (L Brassica oleracea var capitata)
• Drip irrigation in cabbage
• Irrigation on water dynamics
• Management of drip irrigation system
• Drip irrigation system
• Drip adopted farmers in management
• Suggestions offered
• Constraints faced
• Hydraulic performance
• Drip irrigation in tomato
• Economics of drip systems
• Paradigm shift towards modern irrigation systems
• Water use efficiency and economics
• Pigeon pea to drip irrigation
• Pigeon pea
• Bio fertilizers based fertigation schedule
• Varying levels of drip irrigation
• Drip irrigation on yield
• Quality parameters
• Economics of cucumber
• Tagetes erecta L
• African marigold (Tagetes erecta Linn)
• Fertigation through drip irrigation
• Irrigation scheduling
• Water use efficiency
• Water saving
• Drip irrigation in wheat
• Deficit irrigation
• Irrigation levels
• Planting layout
• Turmeric yield and economics
• Disc filter
• Head loss
• Drip irrigation systems
• Metal body disc filters
• Subsurface drip irrigation
• Air injection
• Sandy clay loam soil
• Nano solar pump
• Gravity based drip irrigation
• Vegetable cultivation
• Gravity based drip irrigation system
• Major problem in rainfed areas
• Farmers in Bikaner district
• Drip irrigation system were selected randomly
• Panchayat samities
• Proper economization of water
• Greenhouse grown tomato
• Drip irrigation levels
• Soilless media
• Productivity and economics
• Economics of greenhouse grown tomato
• Surface and subsurface drip irrigation method
• Lateral and emitter spacings
• Textile waste water
• Vegetable crop
• Vegetable crop under drip irrigation
• Physiological parameters
• Seed germination
• Drip irrigation levels on amaranthus
• Amaranthus (Amaranthus hybridus L)
• Yield and water
• Efficiency under shade net
• Sandy loam soil
• Characterize the moisture distribution pattern
• Drip irrigation under sandy loam soil
• Better crop response
• Frictional head loss
• Pressure drop
• On farm drip irrigation systems design
• Farmers’ fields
• Electrical conductivity
• GSM modem
• Sensors and Solenoid valve
• Automated drip irrigation system
• Field level investigation
• Bt cotton
• Nitrogen and seed cotton yield
• Seed cotton yield
• Drip irrigation in Bt cotton
• Different mulch materials
• Vegetative growth
• Yield of ginger
• Ginger (Zingiber officinale Rosc )
• Influence of spacing
• Drip irrigation on yield attributes
• Pigeonpea (Cajanus cajan L )
• Colour plastic mulch
• Okra (Abelmoschus esculentus)
• Different levels of drip irrigation
• Growing period
• Plastic mulching
• Drip irrigation regimes
• Mulching in Mango
• Mango cv Pant sinduri