A new method was proposed in a cold riser experimental apparatus with height of about 18 m and inner diameter of 100 mm according to the result measured by PV-6D optical fiber to calculate the local particle flux and velocity based on all the sampling time. The new method was compared with the method used in the referring paper. The results showed that the values of local particle flux and velocity calculated by the two methods had a great discrepancy. The maximum

minimum and mean relative errors between the cross-sectional mean particle flux and the measured value calculated by this paper and the referring paper were 606.9%

241.3%; 221.4%

89.5% and 388.9%

145.6%

respectively. Thus

the value of particle flux measured by this paper was relatively low. The cross-sectional mean particle velocity calculated by the referring paper was higher than the operating gas velocity

and the gas-solid slip velocity and slip coefficient respectively varied from -1.6 to -4.7 m·s-1 and 0.56 to 0.90

respectively

and thus there was a great difference to the actual gas-solid flow in riser. The cross-sectional mean particle velocity calculated by this paper was lower than the operating gas velocity. The gas-solid slip velocity and slip coefficient varied from 0.6 to 9.6 m·s-1 and 1.11 to 2.14

respectively. There were some problems when using the reflecting optical fiber to measure the particle concentration and it was the main reason that resulted in the higher particle flux

slip velocity and slip coefficient measured by this paper. Furthermore

two fitting functions were come up with to calculate the particle circulation in the riser according to the measuring result by the optical fiber

substituting for the recent volumetric method.