Theoretical investigation on cross-flow heat exchangers with axial dispersion in one fluid |
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| Affiliation: | 1. State Key Laboratory of Coal-Based Clean Energy, Xi’an Thermal Power Research Institute Co. Ltd, Xi’an 710054, PR China;2. State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, PR China;1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;2. State Key Laboratory of Chemical Engineegring, Tianjin University, Tianjin 300072, China;3. College of Food Science and Engineering, Hainan University, Haikou, 570228, China |
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| Abstract: | The axial dispersion model for cross-flow heat exchangers is investigated to predict steady state thermal performance more accurately. This model takes flow maldistribution and backmixing into account and is simple and effective in describing their effect on the temperature effectiveness of a heat exchanger. An exact solution together with its asymptotic form for high dispersive Péclet numbers is obtained. The analysis shows that the temperature effectiveness deterioration caused by axial dispersion is significant for the dispersive Péclet number Pe < 20, particularly when the thermal capacity rate ratio is close to one. The P1, P2-charts are presented, which are useful for the design of compact cross-flow heat exchangers. |
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