Abstract :
Fully-developed turbulent flow for the inner side
in "TWISTED TUBES" with different cross sections
geometries are experimentally and numerically investigated
in the case of constant wall temperature. Two different
geometries are considered. The tubes are helically twisted
along the axis perpendicular to their cross-section .The
helical twist geometry is described by the 360? twist. The
results are comparing with tube without twisting
"SMOOTH TUBE" in order to point out the heat transfer
enhancement and the friction factor increase in the
turbulent flow field . Numerical simulations are performed
for three - dimensional and fully – developed flow by using
RNG k-? turbulence model. Both experimental and
numerical results show that the enhancement in the heat
transfer decrease as the Reynolds number increase and the
values of friction factor decrease as the Reynolds number
increase
Keyword :
numerical method, Numerical simulations, turbulent flow