Heat Transfer Characteristics of Rifled Tubes in the Near Critical Pressure Region

Experimental study on heat transfer to the supercritical water upward flow in a vertical tube with internal helical ribs

“…Here the present experimental data are marked by solid points and the data of other researchers by hollow points. The data of Iwabuchi [25,26] and Wang [31] were excluded from consideration due to their lack, and because their test parameters rather differed from those for the current experiment.…”

“…The heat transfer to supercritical water (SCW) flow in ribbed tubes with specific tube structures was experimentally investigated separately [24][25][26][27][28][29][30][31][32][33], as listed in Table 1.…”

Heat transfer characteristics of water flowing in a vertical upward rifled tube with low mass flux

“…Nishikawa et al [3] detected that rifled tube significantly enhanced heat transfer and heat transfer coefficient was four times higher than that of smooth tube. Whereas, Iwabuchi et al [4] found that at near critical pressure, heat transfer enhancement due to rotational flow caused by the ribs disappeared and heat transfer deterioration even occurred in sub-cooled region. According to Bringer and Smith [5], heat transfer in near critical pressure region was very complicated and the conventional correlation gave a maximum 30% error in predicting heat transfer coefficient.…”