Question

In the given figure of Entry with rounded corner type of changes in flow geometry, the value of friction loss factor (eғ) is_____

(a) 0.33eғs

(b) 0.5eғs

(c) 2eғs

(d) eғs

I have been asked this question during an interview.

The origin of the question is Effects of Friction and Velocity Distribution topic in division Pouring – Gating Design, Melting Furnaces, Melting and Casting Quality of Casting-Forming-Welding I

Answer 1

Right answer is (a) 0.33eғs

The best explanation: eғ = 0.33 eғs, where eғ is the friction loss factor. The value of eғ depends on whether the flow is enlarging or contracting in the direction of flow. And eғs refers to the value corresponding to a sharp change of geometry with identical initial and final dimensions.