Research On Heat Transfer Performance Of Super Slippery Cooling Channel Based On Functional Microstructures

Liquid cooled flow channel heat exchangers are widely used in the field of high-density,highly integrated,and high heat dissipation in electronic systems.Slippery LubricantInfused Surfaces based on functional microstructure is the composite surface of the rough base liquid of the bionic principle.Slippery Lubricant-Infused Surfaces has performance characteristics such as resistance,pressure resistance,and corrosion resistance.To build a slippery lubricant-infused surfaces liquid cooled channel heat exchanger,first build a microstructure in the surface of the heat exchanger,and then irrigate the lubricating oil into the micro-structure to form an oil film.The oil membrane on the slippery lubricant-infused surface makes the water cold flow on the surface from solid-liquid contact to liquid-liquid contact.Therefore,reduce the surface roughness of the flowing wall surface and reduce the resistance of flow.This article studies the composition principle of slippery lubricant-infused surfaces,the processing methods of microstructures,and the performance characteristics of the formed slippery lubricant-infused surfaces.Equivalent the performance parameters of the slippery lubricant-infused surfaces to roughness,contact angle,and oil film thickness.This article establishes a rough surface geometric model through direct modeling method,fractal geometric modeling method,and roughness function method.The performance differences between the slippery surfaces heat exchanger and the rough surface heat exchanger under typical working conditions were analyzed.Building an Slippery Lubricant-Infused Surface can improve the flow performance of the heat exchanger of the liquid cooler tract,and increasing the surface roughness can increase the heat transfer performance of the cooling gritter heat exchanger.This article analyzed the heat transfer environment and heat transfer path.The influence of the flowing and heat transfer performance of different streaming fields,pressure fields,and under-temperature fields is analyzed.The uniformly distributed flow channel with a larger cross-sectional size and a thinner oil film thickness on the super sliding wall has better flow performance;The serpentine flow channel with a smaller cross-sectional size and a thinner oil film thickness on the super sliding wall has better heat transfer performance.The average pressure difference in a serpentine channel is 82 times higher than that in a uniformly distributed channel;The average Po number is 4.9 times higher than that of a uniformly distributed channel.The average thermal resistance of a uniformly distributed channel is1.96 times that of a serpentine channel;The temperature uniformity is 1.24 times that of a serpentine channel.This article uses NSGA-II multi-target genetic algorithm and linear weighted method to establish an optimization model of the slippery lubricant-infused surfaces cold flow heat exchanger structure.The optimal structure parameters of the flow and heat transfer are: cross-section size d = 0.78 mm,the ultra-slip surface contact angle θ = 89 °,the thickness of the ultra-slip surface oil film = 0 μm,and verify the structure.Compared with conventional liquid cooled channel heat exchangers with the same structure,the pressure difference of the super smooth liquid cooled channel heat exchanger decreased by 8.5%,and the Po number decreased by 7.5%,resulting in a relatively significant improvement in flow performance;The thermal resistance has decreased by 4.2%,the temperature uniformity has increased by5.9%,and the heat transfer performance has also been partially improved.The comprehensive performance of this structure’s ultra smooth liquid cold channel heat exchanger is the best.