| Title |
Study on Velocity Measurement and Numerical Computation in a Rectangular Duct with 90° Bend Elbow |
| Keywords |
90° Rectangular bend elbow ; 직사각 곡면 엘보우 ; Laser doppler velocity meter ; 레이저 도플러 유속계 ; Three dimensional numerical computation ; 삼차원 수치계산 ; Turbulent flow ; 난류유동 |
| Abstract |
Fluid flow in a rectangular duct for 90° bend elbow with the ratio of 1.5 between its curvature radius and width is measured by 5W laser doppler velocity meter. The fluid flow is also computed by commercial software of STAR-CD for comparison between measured and computed velocity profiles in the duct. Reynolds numbers for the comparison are 11,643, 19,746 and 24,260. From the comparison, computation of principal velocity components in the duct predicts the experimental data somewhat satisfactorily, even though those of minor velocity components and turbulent kinetic energy do not match with the experimental data quite well. K-factor for the bend elbow is computed to be average 0.086 while the equivalent ASHRAE data is 0.07. |