Aaberg airflow near

The design of the axisymmetrical Aaberg exhaust hood is very similar to a traditional flanged hood. However, it is fitted with a flange through which air can be ejected radially from a narrow slot (see Fig. 10.77). The dramatic effect of the blowing jet on the hood s overall airflow can be explained as follows due to the friction developed at the radial jet/air interface an entrainment flow develops which, under the correct conditions, has the property of removing the clean air from in front of the hood (the recycled flow) as well as enhancing and concentrating the exhaust s suction in a zone along the hood s longitudinal axis (the efficient flow). The flow in front of the exhaust opening is now directional and the process is capable of creating a larger fluid flow toward the exhaust opening at greater distances along the axis of the exhaust hood. Further, although replacement air should still be supplied, the Aaberg exhaust works with sig-  [c.956]

Industrial ventilation design guidebook (2001) -- [ c.539 , c.540 , c.541 , c.542 , c.543 , c.544 , c.545 , c.546 , c.547 ]