混相流
Online ISSN : 1881-5790
Print ISSN : 0914-2843
ISSN-L : 0914-2843
早期公開論文
早期公開論文の2件中1~2を表示しています
  • (液相部の濡れによる広がりを考慮した熱伝達率予測方法の検討)
    新郷 陸, 橋本 大雅, 奥山 邦人, 入江 智芳, 青山 淳
    原稿種別: 研究論文
    論文ID: 2024.002
    発行日: 2024/03/22
    [早期公開] 公開日: 2024/03/22
    ジャーナル フリー 早期公開

    Heat transfer of the stratified/wavy water flow in a horizontal tube is investigated. Considerably low heat transfer in the vapor phase region relative to the liquid phase region produces a large temperature distribution along the perimeter, which makes difficult for deriving the appropriate expression for the heat transfer coefficient. In the 1st report, it was shown that, based on the experiment, the heat transfer coefficient in the liquid phase could be a representative of the entire tube. A model which involved both of convection and evaporation was proposed, where a flat surface of the liquid layer was assumed. In the 2nd report, the spread of the liquid layer due to wetting with the tube surface and its effects on the heat transfer coefficient were accounted for. The prediction agreed with the measured results within approximately 30% error, which is more accurate compared to the prediction for a flat surface.

  • (熱伝達の特性と熱伝達率予測方法の提案)
    新郷 陸, 橋本 大雅, 奥山 邦人, 入江 智芳, 青山 淳
    原稿種別: 研究論文
    論文ID: 2024.001
    発行日: 2024/01/31
    [早期公開] 公開日: 2024/01/31
    ジャーナル フリー 早期公開

    Heat transfer of the stratified/wavy water flow in a horizontal tube is investigated. Under uniform heating, considerably low heat transfer in the vapor phase region relative to the liquid phase region produces a large circumferential temperature distribution, which makes useless to apply the averaged heat transfer coefficient over the perimeter for the estimation of the heat transfer area of heat exchangers. From the distributions of the actual surface heat flux evaluated experimentally, it is confirmed that the heat circumferentially conducted through the tube over the vapor phase region does not affect the liquid phase region due to the high heat transfer in the proximity of the phase boundary. The heat transfer coefficient in the liquid phase is regarded as a representative of the heat transfer of the stratified/wavy flow and predicted by accounting for the contributions of convection and evaporation and compared with measurements.

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