Abstract
Complex flow analysis by gamma-radiotracer utilizes signals of detectors situated around the apparatus. In this case the problem of the relation between detected values and radiotracer concentration has to be solved. Analytical relation was already published for collimated scintillation detector (with several simplifying assumptions) which was used for analysis of parallel flows assuming uniform concentration in both streams. The suggested algorithms were used in parametrical analysis of residence time distribution (RTD) model by non-linear regression. For a general distribution of the tracer concentration another algorithms were suggested and tested by using MC code as well by experiments with point radioactive source. These algorithms are successfully used in verification of complex flow visualisation by computer fluid dynamic method. While the verification on the basis of measurement RTD is sufficient for simple flow structure, the verification on the basis of local responses should be used in the more complex flow structure. Application of suggested algorithms in the verification procedure is demonstrated on results of analysis of “parallel” flow realized on a test rig of the ohmic heater.
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