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Case of injection molding

2009-03-11View Original

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If anyone here has exam examples, please share them
Reply #22009-03-11
It seems it wasn’t found on the forum for case study questions related to injection molding; could it be because there are so many questions, and the seniors who took the exam can no longer remember them? I wonder if the moderator can provide us with the following assistance. I have a question from a chemistry tutoring class here; I’d like to share it with everyone. A liquid is transferred from an open container using a IS65-50-160 type centrifugal pump, with a flow rate of 25 m3/h. The suction pipe of the centrifugal pump is 10 meters long and has a diameter of 68 mm. If the flow within the suction pipe has entered the resistance-square region, with a friction coefficient for straight pipes of 0.03, a total local resistance coefficient of ∑ζ=2, and a local atmospheric pressure of 1.013*105 Pa, what is the maximum installation height allowed for this pump when transporting various fluids? (1) Transporting water at 20°C. (2) Transporting oil at 20°C (pv=2.67 Pa, density=740 kg/m3). (3) Transporting boiling water. If there are any latest lecture materials, I will share them with you later; however, I don’t have the necessary permissions to upload them, so I have to type each character manually, which is quite tedious.

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