Numerical Investigation On Conjugate Heat Transfer In Helical Coiled Tube Under Vertical Placement

Conjugate heat transfer of supercritical CO2 inside helical coiled tube under vertical placement was investigated numerically in the present study. It can be concluded that the flow field of supercritical fluid is affected by both the buoyancy force and centrifugal force in conjugate heat transfer process. The dual effects of buoyancy force and centrifugal force lead to the deflection of second flow direction for the vertical placement, and further results in the heat transfer deterioration region on top generatrix wall for the downward flow larger than that for the upward flow. However, the overall heat transfer performance is slightly better than that in the upward flow in tube side.