Đang chuẩn bị liên kết để tải về tài liệu:
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 0.2 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: 25.07.2003 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 0.2 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 98.7% 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 0.2 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 0.2 - 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, .