Effects of rib geometries and property variations on heat transfer to supercritical water in internally ribbed tubes

Comparison of tubeside condensation and evaporation characteristics of smooth and enhanced heat transfer 1EHT tubes

“…Recently, Li et al [14] discussed how internal surface enhancement can efficiently improve heat transfer under conditions of mixed convection. Grauso et al [15] found that the local evaporation heat transfer coefficient of smooth tubes using R-134a is approximately 15% higher than those of R-1234ze(E) (low global warming potential (GWP) refrigerant), at low vapor qualities for smooth tubes.…”

Comparison of condensation and evaporation heat transfer on the outside of smooth and enhanced 1EHT tubes

“…Li et al [4] found that rib geometries play only a small role in both average and local heat transfer under forced convection, while for the mixed convection case, rib geometry has a significant effect on heat transfer. Guo et al [5] evaluated convective condensation and evaporation inside a smooth tube, herringbone tube and the 1EHT enhanced surface tube.…”

“…Recently, Li et al [26] discussed how internal surface enhancement can efficiently improve heat transfer under conditions of mixed convection. Grauso et al [27] found that the local evaporation heat transfer coefficient of smooth tubes using R-134a is approximately 15% higher than that of R-1234ze(E) (low global warming potential (GWP) refrigerant), at low vapor qualities for smooth tubes.…”

Evaporation heat transfer and pressure drop characteristics of R-600a in horizontal smooth and helically dimpled tubes

“…Moreover, tubes with inside roughness can reduce size and cost of the equipment and are successfully used in practical applications. In this regard, Li et al [2] discussed how internal surface enhancement can efficiently improve heat transfer under conditions of mixed convection. However, they didn't investigate the influence of internal surface enhancement on two-phase flow.…”