N2 - The recently developed special unity Mach number dispersion model prescribes the corrections to heat transfer coefficients which are simple functions of the dispersive Peclet numbers. They can be determined through the residence time measurements. An evaluation method is described in which the measured input and response concentration profiles are numerically Laplace transformed and evaluated in the frequency domain. A characteristic mean Peclet number is defined. The method is also applied to the parabolic dispersion model and the cascade model. A calculated example of a tube bundle with maldistribution and backflow demonstrates the suitability of the evaluation method. L1 - http://journals.pan.pl/Content/94553/PDF/07_paper.pdf L2 - http://journals.pan.pl/Content/94553 PY - 2014 IS - No 2 June EP - 115 DO - 10.2478/aoter-2014-0016 KW - heat exchanger KW - dispersion model KW - transient tracer experiment KW - evaluation method A1 - Roetzel, Wilfried A1 - Chakkrit Na Ranong PB - The Committee of Thermodynamics and Combustion of the Polish Academy of Sciences and The Institute of Fluid-Flow Machinery Polish Academy of Sciences DA - 2014 T1 - Evaluation of resisdence time measurements on heat exchangers for the determination of dispersive Peclet numbers SP - 103 UR - http://journals.pan.pl/dlibra/publication/edition/94553 T2 - Archives of Thermodynamics