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  1. doctorsundar

    How much force to wrap spring around pipe?

    I am trying to compute the surface stress on a steel tube when a spring (made of steel wire) is wrapped around the outside of this tube. The steel wire wraps itself around this tube as the tube spins at about 50 rpm. I suppose that I first need to compute the tension in the steel wire. When...
  2. doctorsundar

    Shell and tube heat exchanger maximum temperature and pressure

    Would it be possible to heat CO2 which is at 20 - 40 psia pressure to a final temperature of 400 deg C, in a heat exchanger of the shell and tube type? I suppose that the heating medium (hot air, for example) should have an entry temperature of 500 deg C. I seem to recall reading somewhere...
  3. doctorsundar

    aqueous amonia properties

    I have a computer program which has the properties of ammonia-water mixtures. Write to me at doctorsundar@hotmail.com. I will send it to you for free. Sundar Narayan, Ph.D
  4. doctorsundar

    Head loss at Entrance

    You had better use a flared inlet if you are concerned about pressure loss. For air ducts, conical intake has 0.25VP entry loss, plain pipe has 1.0VP entry loss. VP = velocity pressure. Sorry I don't have data on water pipes. Sundar Narayan

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