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Water friction in pipes, hot vs cold?

  1. Jul 7, 2006 #1
    I usually use an average number of 2 kPa friction loss for normal tap water in pipes. Does anyone know if this number changes significantly up or down for water which is around 80 degrees C instead of 5?
  2. jcsd
  3. Jul 7, 2006 #2


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    Well, you're looking at only a 3% change in density but a factor of 4 change in the viscosity. Looking at Reynolds numbers (with a constant velocity and ID), this results in a very similar friction factor. I get about .01 vs. .012 for a smooth pipe. I didn't really go any further with the numbers. It looks though like you're not going to see anything noticible. You might do a couple of quick calcs adjusting your density and viscosity to match the two temps.
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