N2 - An evaluation method is developed for single blow experiments with liquids on heat exchangers. The method is based on the unity Mach number dispersion model. The evaluation of one experiment yields merely one equation for the two unknowns, the number of transfer units and the dispersive Peclet number. Calculations on an example confirm that one single blow test alone cannot provide reliable values of the unknowns. A second test with a liquid of differing heat capacity is required, or a tracer experiment for the measurement of the Peclet number. A modified method is developed for gases. One experiment yields the effective number of transfer units and approximate values of the two unknowns. The numerical evaluation of calculated experiments demonstrates the applicability of the evaluation methods. L1 - http://www.czasopisma.pan.pl/Content/94794/PDF/01_paper.pdf L2 - http://www.czasopisma.pan.pl/Content/94794 PY - 2015 IS - No 4 December EP - 24 DO - 10.1515/aoter-2015-0029 KW - heat exchanger KW - single blow experiment KW - evaluation method KW - dispersion model 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 - 2015[2015.01.01 AD - 2015.12.31 AD] T1 - Evaluation method of single blow experiment for the determination of heat transfer coefficient and dispersive Peclet number SP - 3 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/94794 T2 - Archives of Thermodynamics