In the tracer impulse method using only a conductivity probe, the more recommendable calculation method for the circulation liquid velocity was suggested, which decreased the errors resulted from the response time. The effects of the horizontal connection length (0.1≤Lc≤0.5 m), the cross-sectional area ratio of downcomer-to riser (0.11≤Ad/Ar≤ 0.53), and the superficial gas velocity (0.02≤UG≤0.18 m s-1) on the circulation liquid velocity were studied. The horizontal connection length as well as UG and Ad/Ar had a significant effect on the circulation liquid velocity. The circulation liquid velocity increased with increasing Lc.
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