For a fluid flow (with very high viscosity) in a pipe, how to estimate the entrance length? the Re number is less than 1. It seems that the entrance length is significantly long since the temperature increase I got from commercial software doesn't follow the fully developed region equation.
Thanks in advance.
Re: entrance length
You may find correlations for the entrance length in pipe flow in most textbooks (e.g., Ozisik, Heat Transfer - A Basic Aprrocah, 1985, Table 7-2).
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