TY - JOUR ID - 85473 TI - Experimental Study of 3D Flow Field and Scour in a 90 Degree Bend JO - Journal of Hydraulics JA - JHYD LA - en SN - 2345-4237 AU - Vaghefi, M. AU - Ghodsian, M. AU - Salehi Neyshabouri, S.A.A. AD - Y1 - 2008 PY - 2008 VL - 3 IS - 3 SP - 41 EP - 57 DO - 10.30482/jhyd.2008.85473 N2 - Flow is affected by both the pressure gradient and the centrifugal forces in the bend of rivers and theirinteraction leads to secondary flow. In this study the flow field and scour in a 90 degree bend wereexperimentally measured. Experiments were carried out in a channel with mild curvature. A threedimensionalAcoustic Doppler Velocimeter (ADV) was used for measuring the flow field. Also, alaser bed profiler was used for measuring the variation of bed topography. The results show formationof a main secondary flow in the bend and another second secondary flow near the outer bank. Thedirection of the second secondary flow is opposite to the direction of the main secondary flow. Thisflow pattern is evident from the middle sections of the first half of the bend up to the end of the bend.The results of flow pattern and bed scour were also addressed. In addition, the vortices in the bend, thechanges in the secondary flow and the vortices and the scour pattern at the outer bank andsedimentation at the inner bank are investigated. UR - https://jhyd.iha.ir/article_85473.html L1 - https://jhyd.iha.ir/article_85473_d9a24f4e004583aed12d01f22704c6d2.pdf ER -