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Mechanical Engineering

mehlam hamid

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  1. Right .... friction, heat and viscosity!! think i'll find my answer.. thankyou
  2. Thankyou DrD for replying, well let me describe you the procedure : i)The process department defines the tip velocity & OD of the rotor required to process a substance. ii)So, Well get the required RPM of the rotor (v=rω) ,and we need the rotor to run steadily at this rpm iii)Rotor Design is Confirmed, and say I find a rough MMOI ....................................................................................................................... Now, How do I find the Power Required to run the rotor steadily at say 1400 RPM?? And I do know that a high initial torque is required to get the rotor from 0 to 1400 RPM, How to find this initial Torque?? I did try using T=I(moment of inertia) x α(angular acceleration) I know the MMOI , and α = dω / t where dω will be 2*pi*(1400-0)/60 Now here's the problem HOW ON EARTH WILL I BE ABLE TO GET THE TIME 't' ??!
  3. I need to select a vertical motor which drives a vertical Rotor weighing approximately 1000 kgs & 6 m in length. I know the basic power equation P(power)=T(torque) x ω(Angular velocity) But how to find the torque?? - Given- RPM(revs. per min) & M(mass) Also, I do know that T=I(moment of inertia) x α(angular acceleration) But, again how to know Inertia and Acceleration before even manufacturing the rotor??!! the rotor looks somthing like this: https://www.process-worldwide.com/gig-karasek-gmbh/photos-videos/company/235606/500966/#1 PS - Im an intern at a company that manufactures ATFEs(agitated thin fill evaporator), reactors ,ATFDs(agitated thin film dryer)....etc for chemical processes
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