Investigation On Heat Transfer Characteristics Of Hybrid Microchannel And Jet Impingement System

With the rapid development of integrated circuits,the heating power of electronic components is getting higher and higher.If the heat generated can not be quickly dissipated in the electronic components,it will lead to excessive temperature and seriously damage the function and service life of electronic devices.Therfore,the thermal management of high heat flux electronic devices has become an urgent problem for the development of integrated circuit industry.The hybrid microchannel and jet impingement cooling techniques integrate advantages of the microchannel heat sink cooling technology and the jet impingement cooling technology.It is considered to be one of the effective ways to solve the heat dissipation problem of high heat flux electronic devices in the future.In this paper,the hybrid microchannel and slot jet impingement system(M-SJ)was investigated using water as coolant.The main research contents were illustrated as follows:(1)The hybrid microchannel and slot jet impingement systems respectively with trapezoidal(TM-SJ),rectangular(RM-SJ)and circular(CM-SJ)cross-sectional channel shapes were comparatively studied by numerical simulation.The result showed that the TM-SJ had the lowest average temperature and the minimum temperature difference on the bottom surface.The reasons for different cooling performance among hybrid systems with different channels were also analyzed.(2)The flow and heat transfer in the hybrid trapezoidal microchannel and slot jet impingement heat sink(TM-SJ-HS)was experimentally investigated and compared with that of trapezoidal microchannel heat sink without jet impingement(TM-HS).It was found that although the pressure drop of water passing through the TM-SJ-HS was slightly larger than TM-HS,the cooling performance of TM-SJ-HS was better than TM-HS.In addition,the empirical formula for calculating the average Nusselt number of TM-SJ-HS was fitted,which could accurately express the heat transfer characteristics of TM-SJ-HS.(3)The influence of slot jet on the flow and heat transfer performance of TM-SJ was investigated by numerical simulation.Firstly,the position of slot was explored.The slot-position's influence on the average temperature and the temperature difference of bottom surface was analyzed.The optimum slot position was given.Secondly,the influence of slot length on the TM-SJ was studied.The slot-length's influence on the average temperature and the temperature difference of bottom surface was analyzed.(4)The geometrical parameters' influence of trapezoidal microchannel(the channel height,the channel bottom width,the angle between side wall and top wall)on the flow and heat transfer of TM-SJ were explored by numerical simulation.The influence levels of three parameters were also compared.(5)The application of TM-SJ-HS in the thermal management of photovoltaic was studied experimentally.The influence of different fluid distributions of slot jet plate on the cooling performance of TM-SJ-HS was analyzed.Besises,the electric power generations of solar cell cooled by different TM-SJ-HS were compared.