超臨界流体伝熱
超臨界状態は、圧力が臨界圧以上、温度は臨界温度付近（あるいは以上）の状態を指す。超臨界流体は超臨界抽出、汚染物処理など化学プロセス、超臨界水ボイラ・遷臨界CO2ヒートポンプなど幅広い応用されている。
超臨界流体の物性の温度、圧力依存性により流動・伝熱特性の解明が重要である。
本研究は、超臨界圧状態のCO2、水および新冷媒の加熱、冷却過程における熱移動現象を理論解析、数値計算と実験測定による解明する、また、超臨界流体を利用遷臨界CO2ヒートポンプ、熱回収ランキングサイクルのサイクル特性と、超臨界流体に適する最適な熱交換器形状などを検討する。
具体的な取り組みは下記の通りである：
- マイクロスケールチャンネルにおける超臨界流体の流れ、伝熱特性の解明．
- 排熱回収発電サイクル用超臨界冷媒の伝熱特性の研究．
- 排熱回収発電サイクルのサイクル特性の研究．
- 遷臨界CO2ヒートポンプのサイクル特性の研究．
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| 超臨界流体物性温度依存性 |
乱流（上）及び層流（下）状態における伝熱特性 |
オイルを混入した超臨界流体の数値解析 |
参考文献
Shijie Zhang, Xiaoxiao Xu, Chao Liu, Yadong Zhang, Chaobin Dang, The buoyancy force and flow acceleration effects of supercritical CO2 on the turbulent heat transfer characteristics in heated vertical helically coiled tube,
International Journal of Heat and Mass Trasnfer, 125, 274-289 (2018).
[DOI: org/10.1016/j.ijheatmasstransfer.2018.04.033]
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| Xinxin Liu, Xiaoxiao Xu, Chao Liu, Wanjin Bai, Chaobin Dang, Experimental investigation of heat transfer of supercritical CO2 cooled in helically coiled tubes based on exergy analysis, International Journal of Refrigeration, 89, 177-185 (2018)
[DOI: org/10.1016/j.ijrefrig.2018.03.011]
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| Xinxin Liu, Xiaoxiao Xu, Chao Liu, Wanjin Bai, Chaobin Dang，Heat transfer deterioration in helically coiled heat exchangers of supercritical CO2 Rankine cycles,
Energy, Vol. 147, No.15, 1-14 (2018)
[doi.org/10.1016/j.energy.2017.12.163]
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| Kaizheng Wang, Xiaoxiao Xu, Xinxin Liu, Chao Liu, Chaobin Dang," Experimental and numerical investigation on heat transfer characteristics of supercritical CO2 in the cooled helically coiled tube"，International Journal of Heat and Mass Transfer, 108,1645-1655,(2017) [doi: 10.1016/j.ijheatmasstransfer.2017.01.004]; |
| Xinxin Liu, Xiaoxiao Xu, Chao Liu, Jian Ye, Hongrui Li, Wanjin Bai, Chaobin DANG, " Numerical study of the effect of buoyancy force and centrifugal force on heat transfer characteristics of supercritical CO2 in helically coiled tube at various inclination angles"，Applied Thermal Engineering, 116,500-515,(2017)
[doi: 10.1016/j.applthermaleng.2017.01.103]; |
| Xiaoxiao Xu, Yangyang Wu, Chao Liu, Kaizheng Wang, Chaobin Dang, Wanjin Bai, " Experimental investigation on heat transfer characteristics of supercritical CO2 cooled in horizontal helically coiled tube "，International Journal of Refrigeration, In press (2016) [doi: 10.1016/j.ijrefrig.2016.03.010] |
| Kaizheng Wang, Xiao Xiao Xu,Yangyang Wu, Chao Liu, Chaobin Dang, " Numerical investigation on heat transfer of supercritical CO2 in heated helically coiled tubes";Journal of Supercritical Fluids ; 99, 112-120 (2015) [doi:10.1016/j.supflu.2015.02.001] |
| Chaobin Dang, Keitaro Hoshika, Eiji Hihara, "Effect of lubricating oil on the flow and heat transfer characteristics of supercritical carbon dioxide" International Journal of Refrigeration 35, 1410-1417 (2012) |
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Chaobin Dang, Eiji Hihara, "Predicting the cooling heat transfer coefficient of supercritical CO2 with a small amount of entrained lubricating oil by using the neural network method " International Journal of Refrigeration 35, 1130-1138 (2012)
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Chaobin Dang, Eiji Hihara, "Numerical study on in-tube laminar heat transfer of supercritical fluids," Applied Thermal Engineering 13, 1567-1573 (2010)
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Chaobin Dang, Koji Iino, Eiji Hihara, Effect of PAG-type lubricating oil on heat transfer characteristics of supercritical carbon dioxide cooled inside a small internally grooved tube, Int. J. Refrigeration 33, 558-565 (2010)
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Chaobin Dang, Koji Iino, Eiji Hihara, Study on two-phase flow pattern of supercritical carbon dioxide with entrained PAG-type lubricating oil in a gas cooler, Int. J. Refrigeration. Vol.31, No.7, 1265-1272, (2008).
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Chaobin Dang, Koji Iino, Fukuoka K., Eiji Hihara., Effect of lubricating oil on cooling heat transfer of supercritical carbon dioxide, Int. J. Refrigeration. Vol.30, pp.724-731, (2007).
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Chaobin Dang, Eiji Hihara, In-tube cooling heat transfer of supercritical carbon dioxide，part 1: experimental measurement, Int. J. Refrigeration, Vol.27, pp.736-747. (2004).
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Chaobin Dang, Eiji Hihara, In-tube cooling heat transfer of supercritical carbon dioxide，part 2: comparison of different turbulence models, Int. J. Refrigeration, Vol.27, pp.748-760. (2004).
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Chaobin Dang., Eiji Hihara., Cooling heat transfer of supercritical carbon dioxide, Refrigeration, Vol.79，No.920，pp.7-8, 2004. (Japanese)
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Chaobin Dang, Eiji Hihara, Cooling heat transfer of supercritical carbon dioxide, 1st report: Numerical calculation and experimental results，Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers, Vol.20，No.2，pp.163-173. (2003), (Japanese)
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Chaobin Dang, Eiji Hihara, Cooling heat transfer of supercritical carbon dioxide, 2st report: A new correlation for heat transfer coefficient and the effect of lubricant oil, , Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers，Vol.20，No.2，pp.175-183, (2003).
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