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## Summary:

- Determining dynamic viscosity for heat exchanger reynolds number/heat transfer coefficient calculation

## Main Question or Discussion Point

I am trying to run a calculation to work out the overall heat transfer coefficient of an arbitrary ten plate exchanger where the fluid is not determined using Re=puD/mu where mu is dynamic viscosity. When mu is such a strong function of temperature how should I determine which valye to use, say if I assumed it was water of certain temperatures flowing in and out. I'm a materials student so haven't done too much of this.

Many thanks

Many thanks