Concept explainers
Whether the air flow through the trachea of human body is laminar or turbulent?
Explanation of Solution
Writ the formula for Reynolds number.
Here, the density is
When the Reynolds number is less than 2000, the flow is said as laminar flow. When it is greater than 4000, the flow is said as turbulent flow. When it is between 2000 and 4000, the flow is in transitional flow.
Consider that the air velocity through the human trachea is ranges from
The average velocity is
The diameter is
Refer Table B.4, “Physical Properties of Air at Standard Atmospheric Pressure (SI Units)”.
The kinematic viscosity
Substitute
The calculated Reynolds number lies in the range of 2000 to 4000. Thus, the flow of air through the trachea of human body is
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Chapter 8 Solutions
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