The Nusselt number
in single or co-rotative twin-screw screw extruders is of the same order of magnitude [29-31].
Table compares the mean Nusselt number
of MACB scheme and experimental results.
The results of maximum Nusselt number
showed a developing near the side-wall, and it moves further downstream.
Comparing the Nusselt number
at Re = 1000 to Re = 3000 shows an increase of more than two times the convective heat transfer.
The condensation heat transfer coefficients were calculated from two-phase Nusselt number
Temperature gradient is approximated by the gas Nusselt number
, hydraulic diameter, and temperature difference between deposit surface temperature and gas temperature, as given in equation (12)
alpha]] is typically calculated by a Nusselt number
correlation for a circular cylinder in cross flow For this the authors propose the following correlation, which was derived from previous CFD LES investigations of wall mounted cylinders with low height/diameter ratio in steady-state flow:
1]: Navier slip coefficient Nu: Nusselt number
Pr: Prandtl number Q: Heat generation/absorption Rd: Thermal radiation parameter [Re.
7) The local data obtained with the TLCs were averaged over the rectangular sensor area for comparison with the Nusselt numbers
obtained by measurements with the heat flux sensor.
The Gnielinski factor is used to calculate the Nusselt number
using the Reynolds and Prandtl numbers.
Nu Nusselt number
based on outside diameter of smooth tube d / k
7, 8]) claim that the presence of nanoparticles in a fluid alters the flow structure and increases the natural convection mean Nusselt number
for any given characteristic (i.