An aluminum cylinder bar ( 70 GPa E m = ) is instrumented with strain gauges and is subject to a tensile force of 5 kN. The diam
eter of the bar is 10 cm. The Poisson’s ratio of the bar is 0.33. A Wheatstone bridge is constructed to measure the axial strain. Gauge 1 measures the axial strain and gauge 2 measures the lateral strain.
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Answer:
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Explanation:
Given data:
Initial temperature of tank
Initial pressure of tank
Diameter of throat
Mach number at exit
In point a:
calculating the throat area:
Since, the Mach number at throat is approximately half the Mach number at exit.
Calculate the Mach number at throat.
Calculate the exit area using isentropic flow equation.
Here: is the specific heat ratio. Substitute the values in above equation.
exit diameter is 3.74 cm
In point b:
Calculate the temperature at throat.
Calculate the velocity at exit.
Here: R is the gas constant.
Calculate the density of air at inlet
Calculate the density of air at throat using isentropic flow equation.
Calculate the mass flow rate.