| Title |
A Study on Flow Characteristics of Branch Type Sparger in Drain Tank for Depressurization |
| Keywords |
Sparger ; 증기분사기 ; Flow resistance coefficient ; 유동저항계수 ; Flow ratio ; 유량비 ; Design factor ; 설계인자 ; Surface roughness ; 표면거칠기 |
| Abstract |
A numerical analysis on branch type sparger in drain tank for depressurization is performed to investigate the flow characteristics due to the change of design factor. As the result of this study, sparger's flow resistance coefficient is 3.53 at the present design condition when engineering margin for surface roughness is considered as 20%, and flow ratio into branch pipe is 0.41. The correlation for calculating flow resistance coefficients as design factor is presented. Flow resistance coefficient is increased as section area ratio of branch pipe for main pipe and outlet nozzle diameter of main pipe decreasing, but the effects of branch angle and inlet flow rate of main pipe are small. As the change rate of becomes larger, the change rate of flow resistance coefficient increases. The rate of pressure loss has the largest change as section area ratio changing. The condition of maximum flow resistance in sparger is when the outlet nozzle diameter ratio of main pipe is 0.167, the section area ratio is 0.1 and the branch angle is 55 . |