Theoretical And Experimental Studies On The Microevaporator Cooling Device Of High Power Diode Laser Array

The micro-channel cooling assembly of high-power diode laser array developed by Chongqing normal university has reached the international advanced level. However, it has been found in use that the shortcoming of the device is the too large volume due to the extra-device of refrigeration. Therefore, this research further puts forward the thought of applying the refrigeration evaporator miniaturized to instead of the micro-channel as high-power diode laser array cooling assembly, which is commonly used in throttling expansion (evaporation) in engineering thermal physics. The purpose of the research is to make a micro-evaporator cooling assembly with compressed refrigeration on the basis of Joule-Thomson effect, which is fit for the diode laser array refrigeration. There has been precedent in foreign countries that micro-channel evaporation refrigeration is used for semiconductor electronic devices. However, as an advancing technology in field of refrigeration and heat transfer, the micro-evaporator used in diode laser array is for the first time.It has been consulted a large amount of scientific and technical theories, simulations and experiments about compression refrigeration system, micro-channel heat exchanger production and micro-evaporation refrigeration. In this task, the research methods include establishing mathematical model, computer digital simulation, designing of engineering drafting for actual parts, actual device manufacturing and experimental confirmation. Based on the theory of the gas-liquid two-phase flow and fluent mechanics, this thesis has also discussed the theoretical and technical problem about construction and fabrication technology of the micro-evaporator cooling packaged components, and assembly of micro-refrigeration system.The key of this study is how to design the reasonable micro-evaporator chamber cavity-shaped, selecting rational processing material, finding out suitable cooling medium and exploring manufacturing technique of the device, according to the requirement of heat dissipation of diode laser arrays. This project will not only provide new technical support for the development of high power diode laser array applications, but also exploit new field for application of the technology of throttling expansion (evaporation) cooling.In this thesis, the work on high-power diode micro-evaporator cooling component is shown as following:·A mathematical model of gas-liquid two-phase flow for high-power micro-evaporative cooling device in the capillary has been developed;·A mathematical model for the micro-evaporator two-phase flow with phase transition has been developed;·A simulation system of Capillary working state has been established;·Micro-evaporation chamber and capillary structure have been designed;·A mechanical-chemical new technology for made fine copper micro-channel and micro-evaporation has been developed;·Micro-evaporation chamber and capillary device have been made;·Refrigerant, type of compressor and specifications of condenser, which meet the cooling requirements, have been picked out.·A test platform of the micro-evaporator cooling component has been built;·It is initially proved that the device is feasible in the power-on test;The above work has laid a solid foundation for further experimental testing and optimization design.