Systematical Design And Experimental Investigation On A New Plane-plate Capillary Pumped Loop

With the advantages of higher-efficiency, energy-saving and precise temperature -control, which the ordinary heat pipes don't possess, the Capillary Pumped Loop (CPL) has numerous potential application in many high tech fields, for example the heat-transfer control on aircraft and the cooling of electronic devices, etc. However, temperature and pressure oscillation occurs during the process of start-up or variable heat flow; and this oscillation may cause CPL unable to start, make evaporator wick fail to operate because of the shortage on liquid support. Therefore, the oscillation of temperature and pressure has greatly restrained the application and development of CPL. This thesis introduces the operation principles and characteristics of the CPL system, and evaluates the CPL systems that have already been made and put into study. By studying experience from homeland and abroad, on the basis of easy to start-up and reducing systematic oscillation, we have designed and installed a set of new-type flat CPL experimental systems. In flat CPL experimental system, the traditional round evaporator has been abandoned, and the plane evaporator whose surface can joint more closely with the hot surface is adopted. The condenser also breaks through the traditional tube structure, is designed to the flat structure with porous media. Moreover, the link position between the reservoir and circulation is changed too; the injection point of reservoir is put on the end of the condenser. By improving structure, in performance test the CPL system shows great reliability and convenience in process of start-up, and stable performance for variable operation. With porous wick condenser, the system pressure oscillation was reduced largely, even more eliminated. And the injection position of the reservoir reduces start-up resistance, improves system start–up performance greatly. In addition, we have also verified the system's t characteristic of high-efficient heat transfer and prime into the characteristic of CPL. Through experiment phenomenon, integrating Porous media working mechanism, this thesis analyzes reservoir, the circulation pipeline and liquid sup-cooling degree's influence to the unstable phenomenon in CPL system, and have brought forward the suggestion of reducing oscillation of CPL system.