5. A sprue is 200 mm long. The velocity of the molten metal at the top of the sprue is 0.1 mm/sec. The sprue has a diameter of 10 mm at the bottom. The total cavity of the "runner system mold" is 1.2 liters. The viscosity of the molten metal is 0.002 Pa. s and density 2000 kg/m^3. a) What is the velocity of the molten metal at the bottom of the sprue in [mm/s]? b) What is the flow rate in [mm3/s]? c) How much time does it take to fill the mold? d) For a proper design, what should be the diameter of the sprue at the middle (coresponding to z= 200/2 mm) of the sprue? e) Is the flow laminar, mixed, or turbulent at the bottom of the sprue?

5. A sprue is 200 mm long. The velocity of the molten metal at the top of the sprue is 0.1 mm/sec. The sprue has a diameter of 10 mm at the bottom. The total cavity of the "runner system mold" is 1.2 liters. The viscosity of the molten metal is 0.002 Pa. s and density 2000 kg/m^3. a) What is the velocity of the molten metal at the bottom of the sprue in [mm/s]? b) What is the flow rate in [mm3/s]? c) How much time does it take to fill the mold? d) For a proper design, what should be the diameter of the sprue at the middle (coresponding to z= 200/2 mm) of the sprue? e) Is the flow laminar, mixed, or turbulent at the bottom of the sprue?

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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Question

5. A sprue is 200 mm long. The velocity of the molten metal at the top of the sprue is 0.1 mm/sec.
The sprue has a diameter of 10 mm at the bottom. The total cavity of the "runner system +
mold" is 1.2 liters. The viscosity of the molten metal is 0.002 Pa. s and density 2000 kg/m 3.
a) What is the velocity of the molten metal at the bottom of the sprue in [mm/s]?
b) What is the flow rate in [mm3/s]?
c) How much time does it take to fill the mold?
d) For a proper design, what should be the diameter of the sprue at the middle (corresponding
to z= 200/2 mm) of the sprue?
e) Is the flow laminar, mixed, or turbulent at the bottom of the sprue?
h++
Pg Zg constant
2 = Av = Av.
Re =
TST = C"
%3D

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