Phase Transformation Of Nanofluids In Serpentine Microchannels Flow Heat Dissipation Study

With the development of electronic science and technology and the tide of the Internet era,it is inevitable to solve the heat dissipation problem of electronic components.Due to the small space occupied by the micro-channel radiator and its excellent heat dissipation performance,it has gained advantages in the heat dissipation of electronic equipment.The serpentine micro-channel radiator helps to break the boundary layer in the traditional straight micro-channel.Compared with the traditional straight microchannel,the snake-like microchannel radiator can reduce the influence of boundary layer and further strengthen the heat dissipation performance.In this paper,the flow and heat dissipation characteristics of nanofluids in snake-like microchannels are studied by numerical simulation.In this paper,nano-fluids formed by Cu,Al,Al₂O₃ and Si O₂ nanoparticles and water were used as the working medium for research.The main research results are as follows:When the heat flux is 50-60 k W/m²,the four nano-fluids in the snake-like micro-channel are all in non-phase transition state.The relationship between Reynolds number,nano-fluid type,nano-fluid volume fraction,velocity distribution and pressure drop is studied in the flow characteristics.The Cu-water nanofluid has a low velocity and the highest pressure drop in the X-axis direction of the bend.The relationship between Reynolds number,type of nanofluid,volume fraction of nanofluid and convective heat transfer coefficient,temperature,Nusselt number and thermal resistance is studied.Among them,the nano-fluid with the volume fraction of 0.7%in the range of 0.1%-1.3%has the best cooling effect,and cu-water nano-fluid has the best cooling effect.When the heat flux is 70-80 k W/m²,the four nano-fluids in the snake-like micro-channel are in phase transition state.The Reynolds number,the type of nano-fluids,the volume fraction of nano-fluids and the volume fraction of liquid phase,the velocity distribution and the pressure drop are studied in the flow characteristics.Cu-water nanofluid has the lowest liquid volume fraction and the highest pressure drop.The relationship between Reynolds number,type of nanofluid,volume fraction of nanofluid and convective heat transfer coefficient,temperature and Nusselt number is studied.The Cu-water nano-fluid has the best cooling effect when the volume fraction of nano-fluid is 0.5%in the range of 0.1%-1.3%.The flow heat dissipation characteristics after phase transformation are affected by the volume fraction of liquid phase,and the nano-fluid has a certain inhibitory effect on phase transformation.The decrease of the volume fraction of liquid phase will lead to the increase of the pressure drop.In the process of increasing heat flux,phase change heat dissipation can withstand higher heat flux,and the average temperature change is smaller,which is conducive to the stable operation of electronic components.