首页|Numerical research on heat transfer and flow characteristics of R141b refrigerant in metal foam bionic hierarchical microchannels
Numerical research on heat transfer and flow characteristics of R141b refrigerant in metal foam bionic hierarchical microchannels
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Greater heat transfer area is provided since the special porous media frame structure for metal foam. However, it also increases fluid flow resistance, which is not conducive to fluid flow. In this study, the Sarracenia trichome bionic channel structure is innovatively developed to reduce the flow resistance. First, six different types of bionic hierarchical microchannels are modeled using metal foam concerning the high and low rib structure of Sarracenia trichomes. The gas-liquid two-phase flow process is simulated numerically in each microchannel by using R141b refrigerant. Then, the synergy coefficients are compared between the bubble number and heat transfer coefficient in different microchannels. Finally, the velocity field and streamline distribution of the microchannels are studied, and the flow resistances are analyzed. Results show that the bubble number and heat transfer coefficient in the high and low rib microchannels follow the same synergistic trend as the other microchannels. Furthermore, two continuous but different fluid transport modes exist in the hierarchical microchannels with high and low rib structures. The bionic structure transport modes improve the water transport performance and reduce the flow pressure drop.
Bionic structuremetal foamhierarchical microchannelheat transfer and flow characteristics
Zhongyi Li、Wei Wang、Lei Wang、Changhe Du、Hongwei Li
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School of Electrical Engineering, Jilin Technology College of Electronic Information, jilin, China
State Grid Keerqinqu Power Supply Company, State Grid, Neimenggu, China
College of Electronic and Information Engineering, Changchun University, jilin, China
School of Energy and Power Engineering, Northeast Electric Power University, jilin, China
NETL
NSTL
Sage
