%0 Journal Article %1 Das1998 %A Das, Sarit Kumar %A Roetzel, Wilfried %D 1998 %J Cryogenics %K 1998 plate-heat-exchanger transient SLA %N 8 %P 791 - 798 %R 10.1016/S0011-2275(98)00074-5 %T Second law analysis of a plate heat exchanger with an axial dispersive wave %U http://dx.doi.org/10.1016/S0011-2275(98)00074-5 %V 38 %X A second law analysis is presented for thermally dispersive flow through a plate heat exchanger. It is well known that in plate or plate fin type heat exchangers the backmixing and other deviations from plug flow contribute significantly to the inefficiency of the heat exchanger, which is of importance to heat exchangers working in the cryogenic regime. The conventional axial heat dispersion model which is used so far is found to be better than `plug flow' model but still unsatisfactory where the timescale related to heat transfer is comparable with the thermal relaxation time for the propagation of dispersion. The present work therefore considers dispersion as a wave phenomenon propagating with a finite velocity. The study discusses the nature of variation of different contributions to total exergy loss in the heat exchanger with respect to dispersion parameters of the Peclet number and propagation velocity of the dispersive wave. The practical example of the single-pass plate heat exchanger demonstrates how a second law optimization can be carried out for heat transfer equipment under such conditions.

@article{Das1998, abstract = {A second law analysis is presented for thermally dispersive flow through a plate heat exchanger. It is well known that in plate or plate fin type heat exchangers the backmixing and other deviations from plug flow contribute significantly to the inefficiency of the heat exchanger, which is of importance to heat exchangers working in the cryogenic regime. The conventional axial heat dispersion model which is used so far is found to be better than [`]plug flow' model but still unsatisfactory where the timescale related to heat transfer is comparable with the thermal relaxation time for the propagation of dispersion. The present work therefore considers dispersion as a wave phenomenon propagating with a finite velocity. The study discusses the nature of variation of different contributions to total exergy loss in the heat exchanger with respect to dispersion parameters of the Peclet number and propagation velocity of the dispersive wave. The practical example of the single-pass plate heat exchanger demonstrates how a second law optimization can be carried out for heat transfer equipment under such conditions.}, added-at = {2011-01-19T18:05:43.000+0100}, author = {Das, Sarit Kumar and Roetzel, Wilfried}, biburl = {https://www.bibsonomy.org/bibtex/222f3756220c01b33ef4fe2c36036dae2/thorade}, description = {ScienceDirect - Cryogenics : Second law analysis of a plate heat exchanger with an axial dispersive wave}, doi = {10.1016/S0011-2275(98)00074-5}, interhash = {4754788111d0c571152515ba4992f8bd}, intrahash = {22f3756220c01b33ef4fe2c36036dae2}, issn = {0011-2275}, journal = {Cryogenics}, keywords = {1998 plate-heat-exchanger transient SLA}, number = 8, pages = {791 - 798}, timestamp = {2011-01-19T18:05:43.000+0100}, title = {Second law analysis of a plate heat exchanger with an axial dispersive wave}, url = {http://dx.doi.org/10.1016/S0011-2275(98)00074-5}, volume = 38, year = 1998 }