Research On Enhanced Heat Dissipation Technology Of Gas Jet Radiator

With the rapid development of science and technology,electronic products are developing in the direction of high frequency,high speed,intensive and miniaturization.The overheating problem of electronic components is becoming more and more prominent,and it is necessary to design an effective cooling scheme.The radiator is a common means of heat dissipation,but for the conventional single radiator,the optimization of heat dissipation basically reaches the limit,it is necessary to find other cooling methods to meet the requirements of heat dissipation.Jet impingement cooling has the advantages of strong heat dissipation capacity,high energy efficiency ratio and strong local convection heat transfer capacity.Many scholars have carried out research on the heat transfer performance of the radiator under the impact of the gas jet,and obtained a series of research results from the structural design,the influencing factors of the heat transfer performance,and the optimization design,but there is a lack of research on how to use the gas jet and the radiator reasonably.This thesis adopts numerical simulation and experimental research methods to study the enhancement of heat dissipation of gas jet radiator.The main contents are as follows:Firstly,based on the enhanced heat dissipation structure of the combination of gas jet and the traditional straight fin radiator,the numerical calculation model is established,and the Fluent software is used for simulation analysis.The significance analysis of the parameters of gas jet and straight fin radiator is carried out by combining Isight,The jet hole diameter D,the fin height H,the fin thickness W,and the intercostal distance G of the radiator are selected as the design parameters.The second-order response surface method is used to fit the approximate model of thermal resistance calculation,and the empirical formula of combined heat dissipation of gas jet and straight fin radiator is derived on the basis of the approximate model.Secondly,according to the combination of gas jet and different types of radiators,the heat dissipation performance of three kinds of jet hole arrangement(in-line,staggered,circular)and four kinds of radiators(needle rib in-line,staggered,circular and straight rib staggered)is analyzed,through the comparative analysis to select the circular arrangement of gas jet and needle rib staggered radiator optimization of composite structures.The influence of the parameters of the optimized structure on the heat dissipation performance is analyzed by Fluent simulation.An approximate model of thermal resistance calculation is obtained by fitting the optimal structure scheme,and the empirical formula of the optimal structure is derived on the basis of the approximate model.Finally,the above approximate model is optimized to obtain the optimal solution of the combination of gas jet and radiator.According to the combined structure of gas jet and straight rib radiator,combined with the flow field characteristics of gas jet,the height of the radiator surface is designed,and eight radiator types including the regular triangle type I are designed,through the simulation and comparison to select the inverted arc type I radiator as the design scheme,optimization,and contrastive analysis of the initial,design,and the optimized simulation results.The results show that the heat dissipation effect of the optimized scheme compared with the initial scheme is increased to 5.82%,and the heat dissipation effect of the comparative design scheme is increased to 3.7%.The experimental verification is carried out by building the corresponding experimental platform.