# A one-third scale model of a car is to be tested in a wind tunnel. The conditions of the actual

## Question:

A one-third scale model of a car is to be tested in a wind tunnel. The conditions of the actual car are V = 75 km/h and T = 0°C and the air temperature in the wind tunnel is 20°C.

The properties of air at 1 atm and 0°C: ρ = 1.292 kg/m^{3}, ν = 1.338 × 10^{–5} m^{2}/s.

The properties of air at 1 atm and 20°C: ρ = 1.204 kg/m^{3}, ν = 1.516 × 10^{–5} m^{2}/s.

In order to achieve similarity between the model and the prototype, the wind tunnel velocity should be

(a) 255 km/h

(b) 225 km/h

(c) 147 km/h

(d) 75 km/h

(e) 25 km/h

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**Related Book For**

## Fluid Mechanics Fundamentals And Applications

**ISBN:** 9780073380322

3rd Edition

**Authors:** Yunus Cengel, John Cimbala

**Question Details**

Chapter #

**7**- DIMENSIONAL ANALYSIS AND MODELINGSection: Problems

Problem: 131

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