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Experiments on flow boiling heat transfer of ammonia/water mixture inside an internally spirally grooved horizontal tube

発表形態:
一般講演(学術講演を含む)
主要業績:
その他
単著・共著:
共著
発表年月:
2010年08月
DOI:
会議属性:
国際会議(国内開催を含む)
査読:
有り
リンク情報:

日本語フィールド

著者:
Satoru Momoki, Hirofumi Arima, Hiroyuki Asou, Odgerel Jambal, Tomohiko Yamaguchi, Toru Shigechi
題名:
Experiments on flow boiling heat transfer of ammonia/water mixture inside an internally spirally grooved horizontal tube
発表情報:
Proceedings of the International Heat Transfer Conference 巻: 14
キーワード:
概要:
抄録:
Experiments on the flow boiling of zeotropic mixtures waterammonia inside an internally spirally grooved horizontal steel tube with a 12mm average inner diameter were performed. The experimental conditions are mass fraction of ammonia: 0.95,1.0[kg/kg], mass velocity: 40 to 80 kg/(m2s), heat flux: 0 to 20 kW/m2 and pressure: 0.7 MPa. The measured heat transfer coefficient reaches its maximum as the quality approaches to about 0.6 and decreases abruptly as the quality increases. This sharp decrease as quality increases over 0.6 may have been caused by an effect of mass diffusion resistance that increases the temperature locally at vapor-liquid interface. Temperature increase at vapor-liquid interface was discussed by the the analysis of phase equilibrium characteristics and explained by using the relationship of bulk temperature and vapor quality. The heat transfer coefficients were also compared with those for pure ammonia.

英語フィールド

Author:
Satoru Momoki, Hirofumi Arima, Hiroyuki Asou, Odgerel Jambal, Tomohiko Yamaguchi, Toru Shigechi
Title:
Experiments on flow boiling heat transfer of ammonia/water mixture inside an internally spirally grooved horizontal tube
Announcement information:
Proceedings of the International Heat Transfer Conference Vol: 14
An abstract:
Experiments on the flow boiling of zeotropic mixtures waterammonia inside an internally spirally grooved horizontal steel tube with a 12mm average inner diameter were performed. The experimental conditions are mass fraction of ammonia: 0.95,1.0[kg/kg], mass velocity: 40 to 80 kg/(m2s), heat flux: 0 to 20 kW/m2 and pressure: 0.7 MPa. The measured heat transfer coefficient reaches its maximum as the quality approaches to about 0.6 and decreases abruptly as the quality increases. This sharp decrease as quality increases over 0.6 may have been caused by an effect of mass diffusion resistance that increases the temperature locally at vapor-liquid interface. Temperature increase at vapor-liquid interface was discussed by the the analysis of phase equilibrium characteristics and explained by using the relationship of bulk temperature and vapor quality. The heat transfer coefficients were also compared with those for pure ammonia.


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