Study of Compressible High Speed Gas Flow in Piping System : 3rd Report, Flow Characteristics in Junctions

New coefficient to characterize energy losses in compressible flow at T-junctions

“…Other loss coefficient definitions for compressible flow have also been proposed [4,31]. The most significant non-dimensional parameters that must be considered in this problem can be obtained through dimensional analysis (Appendix A).…”

“…To avoid the uncertainty amplification, only type K parameters will be retained. So, doing partial derivatives in (31) considering / constant, the uncertainty of Miller's coefficient definition can be related to the uncertainty of g(x) and h(x, y), according to Eq. (34),…”

“…In this range its influence in the loss coefficient is negligible, see for instance [9][10][11]17,28,31].…”

“…The only reliable data published in the open literature are the experimental data obtained for commercial T-and Y-junctions by Morimune et al [31] and the experimental investigations on Tand Y-junctions with different angles between branches accomplished by Abou-Haidar and Dixon [32]. In the first work, a graphical extrapolation procedure was used to subtract the friction losses and to obtain the extrapolated flow properties up to the junction departing from the measured static pressure at multiple locations in each branch.…”

New experimental correlations to characterize compressible flow losses at 90-degree T-junctions

“…The only reliable data published in the open literature are the experimental data obtained for commercial T-and Y-junctions by Morimune et al [17] and the most complete investigations accomplished by Abou-Haidar and Dixon [18]. In the first, a graphical extrapolation procedure was used to subtract the friction losses and to obtain the extrapolated flow properties up to the junction departing from the measured static pressure at multiple locations in each branch.…”