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원통형 용기내의 상변화물질에서의 응고 열전달에 관한 연구 (경사각 변화의 영향)
송하진,김영중,오수철,임장순,Song, H.J.,Kim, Y.J.,Ohu, S.C.,Yim, C.S. 대한설비공학회 1994 설비공학 논문집 Vol.6 No.3
This paper focuses on the investigation of the heat transfer phenomena that occur inside the cylindrical tube. The inclination of the tube is adopted as a principal parameter varying from vertical to horizontal. The phase change material employed in this experiment is 99 percent pure n-docosane paraffin($C_{22}$ $H_{46}$). It is found that the amount of solidified mass during a prescribed solidifying period is not sensitive to the inclination of the tube but to the local layer thickness. It is studied that the latent energy is the largest contributor to the total extracted energy. The sensible energy($E_{s1}$, $E_{s2}$, $E_{s3}$) may not be negligible at the large wall-subcooling and initial-liquid-superheating, also at the first step of solidifying.
휜이 부착된 수직(垂直) 냉각관(冷却管)에서의 열전달(熱傳達)에 관(關)한 실험적(實驗的)인 연구(硏究)
송하진,이채문,임장순,Song, H.J.,Lee, C.M.,Yim, C.S. 한국태양에너지학회 1984 한국태양에너지학회 논문집 Vol.4 No.2
Experiments were performed to study freezing on a finned vertical tube when either conduction in the solid or natural convection in a liquid controls the heat transfer. Conduction is the controlling mode when the liquid is at its fusion temperature, whereas natural convection controls when the liquid temperature is above the fusion value. The liquid was housed in a cylinderical containment vessel whose surface was maintained at a uniform, time-invariment temperature during a data run, and the freezing occurred on a finned vertical tube positioned along the axis of the vessel. The phase change medium was n-octacosan, a paraffin which freezes at about $61^{\circ}C$. For conduction-controlled freezing, the enhancement of the frozen mass due to finning is greatest when the frozen layer is thin and decrease as the layer grows thicker. The degree of enhancement is generally less than the surface area ratio of the finned and unfinned tube.