The Analysis Of Flow And Heat Transfer Characteristics Of Cooling Channel In Large Computer Room

As the degree of integration of electronic components increases,the amount of heat generated in the converter room of a large computer room increases dramatically.If the heat of this part cannot be dissipated in time,it will directly affect the stability and safe operation of the converter.Therefore,this paper analyzes the cold plate heat dissipation structure of the large-scale machine room converter,simulates the heat dissipation performance of the traditional series and parallel structure cold plates by numerical method,and obtains a new type of variable flow with the vortex generator fin structure.The cooling channel can be used for the structural design of the liquid cooling channel of the large-scale machine room converter to improve its heat dissipation performance.The main work of this paper is as follows:(1)We simplified the cooling plate heat dissipation problem of the large-scale machine room converter and a mathematical model equation of fluid flow and heat transfer in the cold plate flow channel is obtained.The convective heat transfer characteristics of three different structures were simulated by the ICEPAK simulation software using the zero-model equation of turbulence,including series structure,parallel structure and S-type structure.From the perspective of the highest local temperature and temperature uniformity,it is proved that the heat dissipation performance of the series structure cold plate is optimal.(2)Taking the cold plate structure in series as the basic flow channel structure,added ribs and vortex generators respectively to the series flow channels,and carried out a comparative study.The results show that when the temperature of the heat source is definite,the addition of the ribs and the vortex generator can both increase the heat exchange area and cause disturbance to the fluid,thereby increasing the overall heat dissipation by more than10%.When the heat source heating power is definite,the heat dissipation performance of the ribbed structure is better than that of the vortex generator structure,and the basic series cold plate structure has the worst heat dissipation performance.(3)In order to further improve the heat dissipation performance of the cooling passage,the rib and the vortex generator are simultaneously added in the flow passage,and a new complicated structure of the ribbed piece and the vortex generator is developed.The numerical simulation results show that the flow channel of this new structure can effectively improve the heat dissipation performance of the cooling channel.In particular,when the inlet velocity is less than 3 m/s,the total heat dissipation can be increased by more than 9%compared with the ribbed structure and the vortex generator structure.Therefore,it is theoretically verified that this new structure will be more conducive to enhance the heat transfer of the large-scale machine room converter.(4)Optimizing the new structure with ribs and vortex generators,the results of research on the flow and heat transfer characteristics of different amount of ribs show that when the number of vortex generators is definite,the quantity of heat exchange will gradually increase and tend to be fixed with the increase of the number of ribs.And the flow channel structure with twenty-four ribs has the best heat transfer enhancement performance.This conclusion can provide basic theoretical datas for the design and calculation of the cooling channel of the large-scale machine room converter,and also has certain practical application value.