Based on the herringbone corrugated plate heat exchanger,a complete three-plate and two-chan-nel coupled heat transfer model was established,and a detailed numerical analysis was carried out.The re-sults show that the flow distribution is uneven in the unilateral flow mode,which is more serious in the di-version zone,and the flow velocity is the same as the flow distribution law,and the flow velocity is greater in the heat exchange zone near the contact.The radial periodic boundary condition is applied to the compu-tational model,and it is found that the temperature distribution and total heat transfer coefficient of the corrugated plate are smaller than those of the common element heat transfer.Therefore,coupled heat trans-fer needs to be taken into account when performing plate heat exchanger simulation calculations.At the same time,the variation trend of local Nussel number and secondary flow intensity was analyzed,and it was found that in the main flow direction,the variation trend of local Nussel number and secondary flow inten-sity was basically the same,and there was a drastic change in the contact position,which enhanced the heat exchange.
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