The Phase Change Heat Transfer Mechanism Research Of Self-Oscillation Loop Pipe

With the rapid development of electronic technology, electronic and related industries become more compact, integrated and high frequency, resulting in unit volume heat flux electronic devices dramatically. As we all know, more than55%of the failure mode of the electronic equipment caused by high temperature, heat flux continues to increase the reliability of electronic devices and thermal design of heat put forward higher requirements, the cooling technology is facing unprecedented challenges. Faced with this challenge, oscillating heat pipe cooling technology to play its unique advantages, effective control of the electronic components overheating problems. The theme of this thesis is "oscillating heat transfer performance of numerical simulation", to investigate the heat load, filling rate, the length ratio of hot and cold, cooling fluid temperature on the oscillation properties of heat pipe heat transfer by numerical simulation and experiment to obtain the optimum combination of each factor to ensure that the temperature distribution of electronic components to meet the requirements of the system reliability is the ultimate goal of this paper. Specific research of this paper include the following:1. Geometric parameters, physical parameters, heat flux and variable filling volume of the oscillation parameters such as heat pipes and vapor-liquid two-phase oscillation of the impact of heat and mass transfer, heat transfer functions obtained describe the style. Therefore, this paper, based on heat pipe thermal resistance network model, a lumped parameter mathematical model, using the finite difference method to discrete equations obtained effective control equation, and thus on the heat pipe heat exchanger to optimize the structure;2. Determine the heat pipe thermal conductivity as a function of equivalent type. Thermal conductivity of heat exchanger is the main factor for the heat, which requires the axial thermal resistance of heat pipe to small to meet the relatively small temperature difference in the pressure of relatively large heat transfer requirements. Therefore, the theoretical analysis of thermal conductivity is necessary;3. Using SINDA/FLUINT thermal analysis software simulation of the working fluid flow and heat transfer. Optimization through simulation of a variety of calculation and analysis, to determine the optimal thermal design for the experimental basis for the study;4. Structures oscillating heat transfer performance test bed, the simulation results were compared with the experimental results, to effectively demonstrate the correctness of the optimal portfolio.