We wish to perform wind tunnel tests on Stephanie Redfern @The Fluid

Question 20 / 40: We wish to perform wind tunnel tests on a 1/10 size model of an automobile. The model is geometrically similar to the full size automobile. If we wish our experiments to be dynamically similar to the full scale performance of the automobile we must have equivalent Re in addition to several other factors. If we wish to use air, then what should be the wind speed in the tunnel to mimic a full-scale automobile at 60 mph?

A 6 mph

B 36 mph

C 60 mph

D 600 mph

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Explanation:

Re = ρ v D/μ. ρ and μ are constant if air is used in the scale model. So if D is decreased by a factor of 10 then v must increase by a factor of ten. Note that only keeping the same value of Re is not sufficient for maintaining dynamic similarity, but it is a necessary condition.

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https://www.jobilize.com/fluid-mechanics-mcq-quiz-by-stephanie-redfern-tuan-dinh

Fluid Mechanics ME201

Author:

Stephanie Redfern

The Saylor Foundation

USA

Access: Public Instant Grading

Attribution: Stephanie Redfern and Tuan Dinh. Fluid Mechanics. The Saylor Academy 2014, http://www.saylor.org/courses/me201/

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