000			01833nas a2200313 4500
001			BR0807224
003			BR-BrBNA
005			20231130135527.0
007			ta
008			230509b bl.|||p| |||| 00| 00por d
040			_aBR-BrBNA _bpor _cBiblioteca Nacional de Agricultura
041			_a(Pt)
072			_aN20
100	1		_aCardoso, G.G.G.
100	1		_aFrizzone, J.A.
100	1		_aRezende, R.
245	1		_aFator de atrito em tubos de polietileno de pequenos diâmetros
246	1		_aFriction factor for small diameter polyethylene pipes
520	3		_aOn this paper, the results of an experimental study on the hydraulic friction loss for small-diameter polyethylene pipes are reported. The experiment was carried out using a range of Reynolds number between 6000 to 72000, obtained by varying discharge at 20oC water temperature, with internal pipe diameters of 10.0 mm, 12.9 mm, 16.1 mm, 17.4 mm and 19.7 mm. According to the analysis results and experimental conditions, the friction factor (f)of the Darcy-Weisbach equation can be estimated with c = 0.300 and m = 0.25. The Blasius equation (c = 0.316 and m = 0.25)gives an overestimate of friction loss, although this fact is non-restrictive for micro-irrigation system designs. The analysis shows that both the Blasius and the adjusted equation parameters allow for accurate friction factor estimates, characterized by low mean error (5.1%).
650			_aEQUIPAMENTO AGRÍCOLA
650			_aMODELO MATEMÁTICO
650			_aIRRIGAÇÃO
650			_aPOLIETILENO
650			_aPERFORMANCE
773	0		_tActa Scientiarum. Agronomy (Brazil) _xISSN 1679-9275 _g(Jul-Sep 2008), v. 30(3) p. 299-305 _wBR0807224
856	4	0	_uhttp://www.periodicos.uem.br/ojs/index.php/ActaSciAgron^fpdf^lPt
909			_a56 _bSergio Santos _c56 _dSergio Santos
942			_2AGRIS _n0 _cANA
999			_c284366 _d284366