TY - JOUR ID - 85422 TI - Experimental Investigation on the Effect of Curvature of Bend on Secondary Flow in 90 Degree Bend under Equilibrium Bed Condition JO - Journal of Hydraulics JA - JHYD LA - en SN - 2345-4237 AU - Vaghefi, M. AU - Ghodsian, M. AD - Y1 - 2010 PY - 2010 VL - 5 IS - 1 SP - 91 EP - 99 DO - 10.30482/jhyd.2010.85422 N2 - Flow pattern in the bend channels is different from that in the straight channels. Flow is affected byboth pressure gradient and centrifugal forces in the bend of rivers and their interaction leads to formsecondary flow. In the channel bend, radius of curvatures of the bend cause changes in the formationof secondary flow and consequently the flow pattern in the bend. This paper presents variation of flowthrough measurement of three dimensional velocities of the flow in the layers and different sections ofa 90 degree bend under equilibrium bed condition. Experiments were conducted in an experimentalchannel with three different radius of curvature, i.e. mild, moderate and sharp. Vecterino, a threedimensionalvelocity meter, is used to measure the three dimensional velocity of the flow. Formationand changes of secondary flow pattern in the three bends with different radius of curvature isdiscussed. The results indicate that power of secondary flow and vorticity in the second half of thebend increase with decrease in the radius of curvature of the bend. Also, a flow called secondsecondary flow forms near the outer bank and in the opposite direction of the main secondary flow.This flow is evident in the middle sections of first half of bend up to the end of the bend. UR - https://jhyd.iha.ir/article_85422.html L1 - https://jhyd.iha.ir/article_85422_d41db9b4710028abec534f384896c95c.pdf ER -