Abstract
Flow development in a porous tube with mass injection or suction was experimentally studied under the conditions of entrance Reynolds number of 2.1 × 104 and entrance injection or suction ratio from -4.97×10-3 to 2.77 ×lO-3. From the variations of friction factor, axial velocity component, radial velocity component and local shear stress in the flow direction, it was revealed that the flow at x/D>13 was fully affected up to the tube center by mass injection or suction, being well approximated as a self-similar flow. In addition, a simple expression of defect law is proposed for the velocity distribution in the core region. It is applicable to flows at Re>1.5× 104, including the entrance region.
