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Recent content by aali94

  1. aali94

    Simultaneous Cathodic Protection and 4 Wire Resistance Measurement

    I am making an electrical resistance sensor for erosion rate measurement using the Arduino. Since my sensing element is a thin strip of carbon steel, I have to ensure that it is protected from corroding, so I can measure pure erosion. I am measuring the resistance using the 4 wire method, and...
  2. aali94

    Interfacial tension between crude oil and paraffin wax deposit

    I've carried out all my simulations this way and my dissertation is due in a few weeks. I don't think I can make changes now, considering that the simulations take more than 14 hours. But I think I can put that down as future work. Do you think my explanation of the wax being driven by pressure...
  3. aali94

    Interfacial tension between crude oil and paraffin wax deposit

    Thanks for your reply. It seems that my results show that the wax is driven by the difference in pressure between the wax free region and the wax deposit region, rather than shear stress. It seems that the shear rate at the oil-wax interface is zero. The wax is only displaced at the beginning...
  4. aali94

    Interfacial tension between crude oil and paraffin wax deposit

    Sour cream has a viscosity of around 100 kcP
  5. aali94

    Interfacial tension between crude oil and paraffin wax deposit

    I am modelling light crude oils. I found the 4 cP viscosity at a temperature of 100 deg F in a paper by Jessen and Howell (1958). I think they used WTI oil. Also Arabian Light has a viscosity of 9 cP at 20 deg C. I am using 100 kcP because according to Burger et al. (1981), the wax deposit can...
  6. aali94

    Interfacial tension between crude oil and paraffin wax deposit

    Hi, I am trying to model the sloughing of paraffin wax deposits from the walls of oil pipelines due to the flow of crude oil. One of the parameters I require is the interfacial tension between crude oil and the wax deposit. I have varied the interfacial tension in my CFD simulations from 10 to...
  7. aali94

    Shear Stress in Pipe Flow

    I was reading a paper on the strength of paraffin gels formed in pipelines, and I came across a part that said, "In a pipeline, a shear stress of 5 Pa would be exerted on the incipient gel deposit by an oil flow rate of approximately 16,000 barrels oil per day in a 10-in pipeline with an oil...
  8. aali94

    Flow in Pipes

    Thank you, that was really helpful.
  9. aali94

    Flow in Pipes

    U ̅U ̅ I'm trying to understand how fluid friction factor varies with Reynolds number. I do not understand why there is a sudden increase in friction factor at transition and why it then decreases gradually as the flow becomes turbulent? I have read that random fluctuations in velocity in...
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