Q1.

A) A 3.0 inch diameter pipeline carries benzene flowing at a volumetric flow rate of 16 gal/s. Determine: a) The mass flow rate (in kg/sec) b) The molar flow rate (in lbmol/sec)

B) An instrument for determining the velocity of a fluid is known as a pitot tube. This instrument is used in many applications, including measuring the air speed velocity of planes and determining the fluid velocity in process pipe lines. A schematic of a pitot tube used to measure the flow rate in process pipelines is shown in Figure 1. As the fluid impacts the pitot tube the pressure at point Pt increases relative to point Ps (please note that there is no flow in the pitot tube). The larger the pressure differential between Pt and Ps the faster the fluid flow. After calibrating the pitot tube the pressure differential can be used to estimate the fluid velocity.

A pitot tube, with carbon tetrachloride as the operating fluid, will be used to measure the flow rate of n-heptane through a pipeline. At the desired flow rate h1 = 52 cm and h2 = 5.8 cm. Determine the pressure differential (in kPa) for this flow rate.