Exhaust heat exchanger integrated with function of aftertreatment is very important to realize miniaturization and lightweighting of waste heat recovery in vehicle internal combustion engine. Against wall flow diesel particulate filter and plate-fin heat exchanger

various filtered gas side structures integrated particle filtration and heat transfer functions are proposed. Computational fluid dynamics was used to simulate the flow and heat transfer of heat exchanger with different structures under three conditions. The results show that

the gas side structure integrated with heat exchange and particle capture has good thermal-hydraulics performance and significant volume advantages. Compared with the original system

the volume of the integrated system reduces by 43.9%～49.7%. Among the proposed structures

the square porous wall surface has smaller gas pressure drop

the W-shaped porous walls exhibit better heat transfer performance at lower mass flow rates

while the square porous walls perform better in heat transfer at higher mass flow rates. Reasonable arrangement of porous medium at the metal partition is conducive to enhancing the heat transfer performance.