Structure effect on thermal-hydraulic performance in liquid metal – Aviation kerosene printed circuit heat exchanger

•The structure design is obtained for PCHEs of liquid metal and aviation kerosene.•Models are validated with the laboratory operating data.•The optimal channel is provided for trapezoidal cross-section and 0° inclination.•Each liquid metal channel corresponds to two aviation kerosene channels.•The thermal–hydraulic performance of the optimal microchannel are investigated.