| Title |
Influence of NCG Charging Mass on the Heat Transport Capacity of Variable Conductance Heat Pipe |
| Keywords |
Mesh wick ; 메쉬 윅 ; Mass fraction ; 질량분율 ; Working fluid quantity ; 작동유체량 ; Variable conductance heat pipe ; 가변전열 히트파이프 |
| Abstract |
Numerical analysis and experimental study are performed to investigate the effect of heat load and operating temperature on the thermal performance of several variable conductance heat pipe(VCHP) with screen meshed wick. The heat pipe is designed in 200 screen meshes, 500mm length and 12.7mm outer diameter tube of copper, water(4.8g) is used as working fluid and nitrogen as non-condensible gas(NCG). Heat pipe used in this study has evaporator, condenser and adiabatic section, respectively. Analysis values and experimental data of wall temperature distribution along axial length are presented for heat transport capacity, condenser cooling water temperature change, degrees of an inclination angle and operating temperature. These analysis and experiment give the follow findings: For the same charging mass of working fluid, the operating temperature of heat pipe becomes to be high with the increasing of charging mass of NCG. When the heat flux at the evaporator section increases, the vapor pressure in the pipe rises and consequently compresses the NCG to the condenser end part and increases the active length of the condenser. From previous process, it is found out we can control the operating temperature effectively and also the analysis and experimental results are relatively coincided well. |