Numerical study of a shell-and-tube heat exchanger for heating rich monoethanolamine using hot flue gases. Part II: Tube-side heat transfer enhancement

Autor/autori: Dumitru CEBRUCEAN, Viorica CEBRUCEAN

Rezumat: The heat transfer and pressure drop characteristics of the tube-side of a shell-and-tube heat exchanger fitted with full-length twisted tape inserts were numerically investigated. There were analyzed four different twist ratios (y = 3, 4, 5 and 6) of twisted tape. The flue gas was used as the tube-side working fluid. Uniform wall temperature conditions were applied to the surface of the tube. The numerical results obtained for the case with twisted tape ratio y = 3 were compared with those from the studies in literature for validation of numerical method. It was found that the average heat transfer coefficient and pressure drop, respectively, for tubes with twisted tape inserts is 2.1-2.6 and 4.1-5.6 times higher than that of the plain tube. The effect of twist ratio on the heat transfer and pressure drop becomes more visible as the flue gas mass flow rate increases.

Cuvinte cheie: twisted tape, tube inserts, heat transfer enhancement, shell-and-tube heat exchanger, CFD