Effect of Twisted Tape Ratio on the Solar Generator Half-length Pipe

Abstract

The effect of twisted tape ratio has been studied numerically to promoting a swirl effects inside a long half-length pipe. A constant wall temperature demonstrates solar collector at average temperature conditions for the receiver pipe. The flow simulation adjusted at different range of Reynolds number 1500-7000 and varied twisted tape ratio y=2, 3.3, and 5. The results showed that; when the twisted tape pipe increases (for example at 3.4), the average outlet temperature, heat transfer coefficient, Nusselt number, friction factor, and power losses increases to 64, 65, 28, 14.1, 31 % respectively compared with plain pipe, also the average outlet fluid temperature is maximum from 305 K-322 K at low Reynolds number 1500 for all cases and then will be decreasing with increasing Reynolds number .The results presented in contours of temperature distribution and flow trajectory by axial velocity were accomplished to exam the low Reynolds number in solar applications. It showed that, when the swirl geometry used, which would be effect on the axial velocity for the flow by 10 % more than the cases without twist tape.

Heat Transfer Enhancement by Turbulence Generator inside Heat Receiver

“…Solid work is used to investigate fluid and HT problems by solving the governing equations over a particular region of interest. [13] Viscous flow is administrated by the conservation of mass, energy, and momentum equations as follows: Many grid sensitivity tests to ensure that the results are grid independent and 3350,000 cells number was selected for all the computations done in the present work.…”