EFFECT OF TORSION ON HEAT-TRANSFER IN THE CURVED ANNULAR SECTOR DUCT

The effect of torsion on convective heat transfer in a curved annular sector duct with a finite pitch is numerically studied. Seven parameters are identified as major variables describing the flow pattern. The results indicate that torsion will rotate the temperature contours to one side and distort their symmetry. Increasing the Prandtl number will significantly enhance the effect of torsion on the temperature distribution. The torsion effect may also be considerably enhanced by increasing the curvature, the axial pressure gradient, and decreasing the radius ratio. Furthermore, the predicted results are compared with the experimental data and excellent agreement is achieved.