Measurements of Turbulent Flows in the $180^{\circ}$ Curved Duct by Hot-wire Anemometer

열선유속계를 이용한 $180^{\circ}$ 곡덕트 내 난류유동의 측정

This paper reports the characteristics of the three dimensional turbulent flow in the rectangular-sectioned 180 degree bends by Hot-wire anemometer. Grande and Kool proposed a cooling law for the measurements of the flow through the narrow passage. The authors noticed that the calibration coefficients of original method are not constant and fairly sensitive to the flow approaching angle. Measured voltages are converted to three velocity and six Reynolds stress components using the modified method in which the coefficients are treated as a function of approaching angle.