The Pipe Flow and nozzle Apparatus is designed to enable the flow of gas through nozzles,
pipes and other forms to be studied experimentally at Reynolds Numbers up to 200,000. Air is the medium
and this is drawn through the apparatus by means of a centrifugal fan, the characteristics of which may also
be studied
The apparatus is shown in Fig.1, the principal component being the length of smooth-walled circular
brass pipe, into which air is drawn at the left and from which it is discharged by the fan at the right. At entry
the air passes through a parabolic nozzle, in which the pressures are observed by an axial probe. The
pressures at one point in the nozzle and several points in the pipe are observed by means of series of
piezometer rings in the wall. The pressures in the pipe cover three regimes: the pressure recovery after the
nozzle, a setting length, and a length in which the flow of air is turbulent but steady for observation of pipe
friction. Following this part, a perspex block is provided in which is mounted a total head tube which, with
the aid of a micromoter screw, may be traversed across the tube. Between this block and the fan it is possible
to insert for investigation venturi tubes and orifices of various forms, which their pressure tappings. The
pressure tappings are all led to an inclined water manometer.
With the parabolic nozzle, which has a throat diameter of 2 in, Reynolds