| With the development of industrial technology,the heat brought by the electronic chips of large scale integrated circuits will accelerate the loss of the chips.The conventional heat dissipation methods in the past can’t normally meet the heat dissipation requirements of high-power chips.Due to the high integration and high power consumption of the chips,it is increasingly difficult to find high-efficiency heat dissipation devices and high heat transfer performance,which has become an urgent matter for the industry.In this paper,aiming at the problem of high integration chip heating,the heat dissipation device and heat transfer medium are studied.The work of this paper is as follows:（1）Aiming at the problem that the high-power chip heats up and the traditional heat dissipation method is no longer applicable,which leads to the chip damage,an improved"grid"microchannel heat exchanger with improved heat exchange structure is proposed and an experimental platform is built.Firstly,on the"grid"microchannel heat exchanger,the structure of the"grid"microchannel was improved by changing the internal structure of the microchannel.Secondly,the experimental platform was built through the microchannel heat dissipation system,constant temperature system,fluid circulation system and data acquisition system.Finally,deionized water was injected into the experimental platform to verify the airtightness of the experimental device,making preparations for the following experiments.（2）Al2O3nanofluid solution with stable performance was prepared by"two-step method",and the performance of"grid"and improved"grid"microchannel heat exchangers was compared.Al2O3nanofluid with equal volume fraction was injected into the two microchannel heat exchangers for flow and heat dissipation analysis,and the data of chip temperature and inlet and outlet pressure drop under the two microchannels were obtained.Then Nusselt number and flow resistance of nanofluid were obtained by theoretical calculation,and heat dissipation of different microchannel heat exchangers under the same heat transfer medium was compared.The experimental results show that the improved"grid"microchannel has better heat dissipation capacity.（3）On the basis of the improved"grid"microchannel,the heat transfer and flow characteristics of Al2O3nanofluid and deionized water in the improved"grid"microchannel are analyzed by numerical simulation.The comprehensive performance of the improved"grid"microchannel is analyzed qualitatively and quantitatively.The flow and heat transfer characteristics of Al2O3 nanofluid with different volume fractions are compared under different Reynolds numbers.The structure of the improved"gate"microchannel was optimized.（4）The numerical simulation method of magnetic Fe3O4nanofluid in the improved"grid"microchannel under the action of magnetic field is put forward.First,constant magnetic fields in horizontal,vertical and inclined directions are applied around the microchannel,and then the effects of three different magnetic fields and magnetic intensity on the convective heat transfer of magnetic Fe3O4nanofluid in the improved"grid"microchannel are compared,so as to obtain the best magnetic field direction and intensity. |
