초록

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본 연구에서는 증발분출냉각장치의 설계 및 이의 응용을 위하여 두께가 비교 적 두꺼운(120mm) 다공물질층을 모델로 사용하여 증발분출냉각에 관한 열전달특성을 실험적으로 조사하였다. 실험은 열과 유체의 흐름이 1차원 정상상태에 대하여 증발 영역의 발생과 그 길이 및 상변화위치, 그리고 다공물질층의 표면온도등에 영향을 미 치는 인자들을 조사하며, 아울러 냉각수의 상변화시 다공층내 냉각수 유동의 안정성 여부를 관찰하였다.

Abstract ▼ AI-Helper

Heat transfer characteristics of evaporative transpiration cooling was investigated experimentally in the range of coolant mass flux, 0.002kg/m$^{2}$.sec~0.015m$^{2}$.sec. Glass beads, sand and copper particles were used as porous media and distilled water was used as a conan...

Heat transfer characteristics of evaporative transpiration cooling was investigated experimentally in the range of coolant mass flux, 0.002kg/m$^{2}$.sec~0.015m$^{2}$.sec. Glass beads, sand and copper particles were used as porous media and distilled water was used as a conant. The existence of evaporation zone was confirmed on this experimental conditions and its length increases with increasing article size and with decreasing mass flux. In order to get the low surface temperature, porous materials with high thermal conductivity is preferred when the panicle sizes are same, and small particles with low porosity is effective in case of the same material. Due to the relatively small coolant mass flux, evaporative transpiration cooling system could be stable by the capillary effect.

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