Abstract
An experimental study is performed for dividing turbulent channel flow in 90 degree T-junction with sharp and various shape corners. Experiments are conducted for flow rate ratios of 0.2, 0.4, 0.6 and 0.8 (ratio between the flow rates in the branch and main channels) keeping the Reynolds number of the main flow at 4.0x10^4. The width of main channel H_1 is kept to 30mm, and the width of the branch channel H_2 is changed 15mm, 30mm and 45mm. The wall static pressure is measured and loss coefficient is evaluated. The velocity profiles are measured by a PIV system. The results show that rounding the corner reduces the pressure loss in the branch flow. As the ratio of width of the main channel to branch channel decreases, the reduction of pressure loss in the branch flow becomes large. It relates that the reattachment length is shorter compared with that of the sharp corner. Whereas the pressure loss in the main flow basically remains unaffected.
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