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- 新川 正
- 小山工業高等専門学校工業化学科
書誌事項
- タイトル別名
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- Heat Transfer Coefficient in Downward Flow Vertical Liquid Film Type Evaporator
- カコウシキ スイチョクエンカンガタ エキマク ジョウハツ ソウチ ノ ネツ デ
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Experiments were made on a vertical long tube evaporator (Cu-pipe : 13.47 mmI.D., 1.2 mint and 1.2 m height) using H2O and H2O-CH3OH systems. Heat transfer coefficients were evaluated by measuring the pipe wall's temperature with metal-sheathed insulated C-C thermocouples (dia. of flexible protector : 1.0 mm) buried in the heating wall.<BR>The correlation of the over-all coefficient was proved to be similar to that of the upward-type evaporator. Condensing heat transfer coefficient of saturated steam in the heating jacket was about 46% larger than the calculated values by Kirkbride's equation. Regarding the heat transfer coefficient of annular liquid flow with evaporation, it was found that the correlation between Nu/ (Pr) 1/3 and Reynolds number of evaporating vapor Rev was not influenced by feed mass flow rate F. The correlation was as follows : <BR>Nu=0.82 (Rev) 0.46 (Pr) 1/3<BR>The heat transfer coefficients depended not only on the mean thickness of liquid film but also on the turbulence of interior and surface of liquid film. The results of this experiment, arranged by using Lockhart and Martinelli's parameter 1/Xtt, were analogous to the results obtained by Dengler et al. using upward water-air two-phase flow.
収録刊行物
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- 化学工学論文集
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化学工学論文集 6 (5), 481-488, 1980
公益社団法人 化学工学会
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詳細情報 詳細情報について
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- CRID
- 1390001204508197760
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- NII論文ID
- 130000869438
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- NII書誌ID
- AN00037234
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- ISSN
- 13499203
- 0386216X
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- NDL書誌ID
- 2193760
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
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