| Title |
Estimation of Head Loss Coefficient Empirical Formulas Using Model Experimental Results in a 90° Angle Dividing Channel Junction |
| Authors |
박인환(Park, Inhwan) ; 성호제(Seong, Hoje) ; 김형준(Kim, Hyung-Jun) ; 이동섭(Rhee, Dong Sop) |
| DOI |
https://doi.org/10.12652/Ksce.2017.37.6.989 |
| Keywords |
분기수로;에너지손실;손실계수;유량비;Froude 수 Dividing channel junction;Energy loss;Head loss coefficient;Flowrate ratio;Froude number |
| Abstract |
In this study, hydraulic experimental studies were conducted to estimate the empirical formulas of loss coefficient, which is necessary to calculate the energy loss occurred in the dividing channel junction of sewer system. The experimental apparatus was consisted of two outflow conduit with a $90^{\circ}$ angle to the inlet conduit, and the pressure and velocity heads are measured to analyze the energy losses in the branch. The measurements of the hydraulic grade line show that the hydraulic grade line was steeply descended at the dividing point due to the head loss, and the decreasing amount of velocity head increased with the increase of flowrate ratio. The head loss exponentially increased in the outlet with larger runoff as the increase of flowrate ratio and Froude number, and the head loss coefficient also increased. On the other hands, the head loss coefficients decreased in the outlet with smaller runoff as the increase of the flowrate ratio and Froude number. Using the experimental results, the empirical formulas of loss coefficient was suggested for each outlet, and the error of empirical formula was 3.91 and 5.19%, respectively. Furthermore, the total head loss coefficient calculated by the two empirical formulas was compared with the experimental results, and the error was 3.62%. |