Given: The drag characteristics of a torpedo are to be studied in a water tunnel using a 1:5 scale model. The tunnel operates wi th fresh water at 20°C, whereas the prototype torpedo is to be used in seawater at 15.6°C. To correctly simulate the behavior of the prototype moving with the velocity of 30 m/s, what velocity (in m/s) is required in the water tunnel?
1 answer:
Answer:
The velocity in the water tunnel is 128.717m/s
Explanation:
To find the result we need to Apply dynamic symiliraty, that is,
Where is the kinematic viscosity, V the velocity and I the lenght.
To find the kinematic viscosity it is necessary search in the table with this properties (I attached it)
To this kind of fluids, the properties to 15.6°c (Seawater) and 20°c (Water)are:
(Seawater)
(Water)
Replacing,
Solving to V_m
The velocity in the water tunnel is 128.717m/s
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