Consider a large dirigible (like the Goodyear blimp) with length L = 240 m, and average diameter D = 40 m moving at a speed U = 135 km/hr at high altitude where the air density is p = 0.9 kg/m³ and the dynamic viscosity is µ = 1.8 × 10-5 N – s/m². Because of the large size of the blimp and its large radius of curvature the primary forces acting on it are due to shear stresses at the surface, and the entire surface area can be approximated by its layout as a flat plate. Determine the drag force acting on the dirigible due to shear stresses, and the power required for the engine.

Consider a large dirigible (like the Goodyear blimp) with length L = 240 m, and average diameter D = 40 m moving at a speed U = 135 km/hr at high altitude where the air density is p = 0.9 kg/m³ and the dynamic viscosity is µ = 1.8 × 10-5 N – s/m². Because of the large size of the blimp and its large radius of curvature the primary forces acting on it are due to shear stresses at the surface, and the entire surface area can be approximated by its layout as a flat plate. Determine the drag force acting on the dirigible due to shear stresses, and the power required for the engine.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Properties of Fluids

The term fluid represents a type of substance that can easily change its shape under any external pressure/force and can flow. Fluids can acquire any shape in which it is stored and can resist normal stresses but cannot resist shear stress in rest condition. Whenever external shear stress is applied to fluids, it starts to flow. The fluids may be liquid or gas. Example- water, air, etc.

Question

Consider a large dirigible (like the Goodyear blimp) with length L = 240 m, and average
diameter D = 40 m moving at a speed U = 135 km/hr at high altitude where the air
density is p = 0.9 kg/m³ and the dynamic viscosity is u = 1.8 x 10-5 N – s/m².
Because of the large size of the blimp and its large radius of curvature the primary forces
acting on it are due to shear stresses at the surface, and the entire surface area can be
approximated by its layout as a flat plate. Determine the drag force acting on the dirigible
due to shear stresses, and the power required for the engine.

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