... pipe walls and decreases with the radius of the pipe. Contents Introduction Page 2 Background and Theory Page 3 Apparatus Page 6 Raw Results Page 7 Calculations Page 8 Analysed Results Page 11 Discussion Page 14 Conclusions Page 15 References Page 16 Introduction An experiment was performed in the aerospace laboratory to investigate air flow through a pipe. Air was moved through the pipe at an unknown constant speed using a vacuum pump and the calculation of mass flow rate of the moving air was to be performed by two different methods. The first method was to measure the pressure difference across a venturi - a narrowing of the pipe. The diameter of the pipe before and after the venturi was known. From this the velocity of the fluid could be calculated from which the mass flow rate can be easily calculated. The second method was to traverse a pitot tube across the pipe and calculate the pressure difference at varying diameters from the ...

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