Numerical simulation plate side flow heat transfer new plate-shell heat exchanger with considering physical property changes and shell heat transfer
With superior heat transfer performance and temperature and pressure resistance,plate-shell heat exchangers have broad application prospects in chemical production and other fields.Utilizing the realizable k-ε turbulence model combined with the enhanced wall function,a numerical simulation study was carried out on the plate side flow and heat transfer characteristics of a new type of plate-shell heat exchanger.The change of medium physical properties with temperature and the influence of shell heat transfer on heat transfer performance were discussed,and the fitting correlation formula obtained from existing experiments was verified.The flow and heat transfer characteristics of different corrugation heights at different inlet flow velocities were analyzed emphatically.At the same time,based on the field synergy principle,the synergy between the velocity field and the temperature field,and the field synergy angle distribution of the velocity field and the pressure field were revealed.The results showed that the flow and heat transfer of the heat exchanger couldnot ignore the influence of the change of the fluid medium's physical properties and the heat transfer of the shell.With increased corrugation's inclination height,the fluid flow line changed from"longitudinal flow"to"crossflow".The distribution tended to be uniform and the heat transfer performance was improved.Continuous vortex structures were formed along the crests and troughs,and a periodic,centrally symmetrical high-shear vorticity concentration zone was formed around the contact point.The local field perpendicular to the flow direction synergistically presented a periodic variation,and the higher the corrugation height,the more pronounced the periodicity.Although the field synergy performance increased with the increase of the corrugation height,the fluid flow state changed with the increase of the flow velocity,and the flow in the core area of the corrugated channel was similar to the heat flow,which made the degree of synergy worse.
plate-shell heat exchangercorrugated heightthree field synergy principleflow and heat transfernumerical simulation
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