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>Thermo-Hydraulic Performance of a Fin-and-Tube Heat Exchanger with Differently Configured Curved-Rectangular Vortex Generators
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Thermo-Hydraulic Performance of a Fin-and-Tube Heat Exchanger with Differently Configured Curved-Rectangular Vortex Generators
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机译：Thermo-Hydraulic Performance of a Fin-and-Tube Heat Exchanger with Differently Configured Curved-Rectangular Vortex Generators
In this study, the thermal and hydraulic performances of three curved-rectangular vortex generators (VG_1, VG_2, and VG_3) in a compact fin-and-tube heat exchanger were numerically investigated. The secondary flow theory and field synergy principle were employed to characterize the effects of VGs on the flow characteristics and hence the heat transfer enhancement. The thermal and volume goodness enhancement factors were utilized to evaluate the overall performance of VG configurations on the engineering aspects. Results reveal that the secondary flow and synergy between the flow and temperature fields are significantly promoted by applying VGs, by which the heat transfer performance is enhanced. By increasing the tube row number from 3 to 5, the global Nusselt number increases for all the VG cases due to the improved thermal mixing of air flow and fin efficiency. However, in terms of the per-tube heat rejection enhancement, the configuration with tube row number of 3 is most effective for all the VG designs. Results indicate that VG_2 has achieved the best balance between the thermo-hydraulic and volume goodness criterions. The obtained thermal and volume goodness enhancement factors by VG_2 reach as high as 1.42 and 1.24, respectively, manifesting its potential for the development of high-performance and compact fin-and-tube heat exchangers.
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