Effect of heat source temperature on flow heat transfer in asymmetric nanochannels
In response to the current demand for miniaturized and high-performance heat dissipation in electronic devices,the study of fluid flow heat transfer within nanochannels has garnered significant attention.In this paper,the molecular dynamics simulation method was used to investigate the heat transfer characteristics of water molecules flowing through asymmetric channels under varying heat source temperatures.The results indicated that the fluid flow and heat transfer process were affected by the increase of the groove structure in the bottom part and the change of the heat source temperature.The increase of groove structure enhanced the gathering ability of water molecules at the structure,while higher heat source temperature dispersed the high-density region formed.However,increasing the groove structure weakened the overall flow velocity in the channel,reduced the velocity slip at the bottom wall surface,and increased the flow resistance coefficient.Conversely,increasing the heat source temperature had the opposite effect,improving the process of the water molecule flow.Under the same heat source temperature,the temperature of water molecules near the bottom rough wall surface was higher than that near the top wall surface.Increasing the groove structure will increase the heat transfer area between the solid-liquid,reduce the temperature jump length of the solid-liquid interface,and increase the Nusselt number.However,increasing the temperature of the heat source will enhance the temperature jump length of the interface,weaken the heat transfer between the solid-liquid,widen the temperature difference between the fluid and the heating wall,and decrease the Nusselt number.
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