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首页> 外文期刊>Journal of enhanced heat transfer: Theory and application in high performance heat and mass transfer >EXPERIMENTAL AND NUMERICAL STUDY ON A NOVEL HEAT EXCHANGER WITH SPIRAL SHELL AND U-JUNCTION TUBES
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EXPERIMENTAL AND NUMERICAL STUDY ON A NOVEL HEAT EXCHANGER WITH SPIRAL SHELL AND U-JUNCTION TUBES

机译：EXPERIMENTAL AND NUMERICAL STUDY ON A NOVEL HEAT EXCHANGER WITH SPIRAL SHELL AND U-JUNCTION TUBES

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摘要

A novel configuration heat exchanger is introduced, and its performance is evaluated through experimental tests and numerical simulations. The heat exchanger consisted of a spiral plate shell and a set of multipass tubes crossed through the shell channels with U-junctions. This novel configuration was expected to provide a high local heat transfer rate, by establishing a local cross-current contact pattern, and high thermal efficiency, by providing an overall counter-current pattern that retains the heat transfer driving force across the heat exchanger. In the experimental tests, hot water at three temperatures (35 degrees C, 40 degrees C, and 45 degrees C), cold water at a constant temperature of 30 degrees C, and four different flow rates of both hot and cold fluids were applied. A three-dimensional computational fluid dynamics (CFD) simulation was conducted to better understand the heat transfer and hydrodynamics of the fluids within the heat exchanger. The renormalization group k-epsilon turbulence model was used to simulate the turbulent flow field, and the simulations were done based on the experimental test conditions. The Nusselt number, thermal effectiveness, and pressure loss were studied in the heat exchanger evaluation. Also, the measured thermal performance, in terms of effectiveness, was compared with the values obtained from empirical correlations for shell and tube exchangers and shell and helically coiled tube heat exchangers for the same values of the number of heat transfer units and the ratio of the lower heat capacity flow rate to higher heat capacity flow rate. The results revealed that the new configuration had high thermal effectiveness (up to 78% in the studied range), which was on average 8% over the shell and tube heat exchanger and 19% over the shell and helically coiled tube heat exchanger. Furthermore, the CFD modeling results were validated with a maximum error of 7.5% in comparison with the experimental results.

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