불응축가스량이 가변전열 히트파이프의열수송 특성에 미치는 영향 = Influence of NCG Charging Mass on the Heat Transport Capacity ofVariable Conductance Heat Pipe

다국어 초록 (Multilingual 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.

참고문헌 (Reference)

1 "Temperature control using variable conductance closed two-phase heat pipe" 23 (23): 427-433, 1996

2 "Study on the heat transfer performances of non-condensable gas and working fluid quantity in a copper-water variable conductance heat pipe" 317-323, 2003

3 "Performance prediction of variable conductance heat pipe" 1463-1468, 2001

4 "Influence of NCG charging mass on the thermal characteristics of variable conductance heat pipe with screen mesh wick" 1400-1405, 2004

5 "Heat Pipe Science and Technology" Taylor & Francis 493-577, 1999

6 "Experimental study of heat transfer performance of variable conductance heat pipe with screen mesh wick" 7-12, 2003

7 "Development of a variable conductance heat pipe for a sodium-sulfur battery" 20 : 71-76, 2001

8 "Critical heat flux and working fluid quantity in thermosyphon heat pipe" 193-208, 1998

9 "Comparison of first-order and flat front models Journal of Thermophysics" 3 (3): 401-405, 1989

10 "Analysis on the thermal characteristics of variable conductance heat pipe" 13 (13): 38-47, 2001

11 "Analysis of thermal performance of water-copper variable conductance heat pipe by considering the 1st order diffusion model" 64-69, 2002

12 "A variable-conductance heat pipe radiator for MAROTS-type communication spacecraft Journal of Spacecraft" 16 (16): 176-180, 1979

13 "A study on the heat transfer characteristics in terms of performance factor of miniature hear pipe with screen mesh wick" Chungnam National University 100-112, 2004