Abstract
This paper focuses on the numerical study of fluid flow and heat transfer characteristics in double-layer staggered trapezoidal convex rib and concave microchannel (SMCCR). The effects of base thickness ratio (α) and height ratio (β) on thermal performance were studied by numerical simulation. Comparison was made between SMCCR and rectangular straight microchannel (MC). The comprehensive performance of SMCCR was evaluated. The heat transfer enhancement mechanism of SMCCR is analyzed by using flow field, temperature field and pressure field. The results show that the heat transfer performance of SMCCR-2 microchannel is better than that of MC microchannel and MCCR-2 microchannel. When Re=279, among the seven designed channels, the PEC of SMCCR-2 channel with α=2 and β=0.5 structure reaches 2.35, and the comprehensive heat transfer effect is the best. When the thermal resistance Rth is the same, the SMCCR-2 channel with β=0.5 needs less pumping power and less energy consumption. By comparing this special structure microchannel with the traditional straight microchannel, the advantages and characteristics of double-layer staggered trapezoidal ribbed groove microchannel in heat transfer enhancement are analyzed, thus providing useful reference for practical engineering application.