Air is flowing through a pipe with an internal Steve @The Saylor

Question 21 / 33: Air is flowing through a pipe with an internal diameter of 12 cm. It passes through an orifice of diameter 5 cm. The air density at the operating conditions is about 1.3 kg/m³. The observed pressure difference across the orifice is approximately 100 mm Hg, and the flow coefficient for the orifice is approximately 0.7. What is the mass flow rate of air in m³/s?

A $$2.0 m^3/s$$

B $$0.2 m^3/s$$

C $$0.4 m^3/s$$

D $$0.002 m^3/s$$

E $$4.0 m^3/s$$

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Explanation:

Please refer to the eFunda resource on the "Orifice Flowmeter Calculator" in Section 2.1.3. The form of the correlation is inspired by Bernoulli's equation, but the meaning of the flow coefficient is defined by the correlation. For the case here, we use Q = C_fA_o (2 Delta P / rho )^½ and solve for Q = 0.2 m³/s.

Quiz Home Page

https://www.jobilize.com/thermal-fluid-systems-mcq-quiz-by-dr-steve-gibbs

Thermal-Fluid Systems ME303

Author:

Dr.Steve GibbsProfessor

The Saylor Foundation

USA

Access: Public Instant Grading

Attribution: Dr. Steve Gibbs. Thermal-Fluid Systems. The Saylor Academy 2014, http://www.saylor.org/courses/me303/

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