Sudden Expansion Because the cross-sectional area is widened, the two sections do not have the same speed ... This number is related to the Reynolds number and surface roughness ratio (e/D). ... Head Loss Head loss is a measure of the reduction in the total head (sum of elevation head, velocity
Fig. 2 Velocity components in axial and radial directions, as functions of radiallead, reductionratio ... material Table 1 Experimental conditions in axisymmetric extrusion using model materials ram speed 1.0 ... 반경 r인 단면을 통과하는 체적유동률(rate of volume flow)로 정의된 유동함수(flow function)는 식 (14)와 같다. (14) 식 (14)를 축방향 속도 u에