Hai-Song Zhang, Xin-Jie Zhu, Bing-Guo Zhu, Jin-Liang Xu, Huan Liu. Effects of buoyancy and acceleration on heat transfer of supercritical CO2 flowing in tubes [J]. Acta Physica Sinica, 2020, 69(6): 064401-1
- Acta Physica Sinica
- Vol. 69, Issue 6, 064401-1 (2020)
Fig. 1. Experiment setup.
Fig. 2. Vertically positioned test tube.
Fig. 3. Vertically positioned test tube.
Fig. 4. Local inner wall (T w, in), Bu , Ac distributions with bulk fluid enthalpy (i b): (a) P = 8.220 MPa, G = 200 kg/(m2·s), q w = 60 kW/m2, (b) P = 8.220 MPa, G = 520 kg/(m2·s), q w = 42 kW/m2.
Fig. 5. Local inner wall (T w, in), Bu , Ac distributions with bulk fluid enthalpy (i b): (a) P = 8.220 MPa, G = 700 kg/(m2·s), q w = 245 kW/m2, (b) P = 8.220 MPa, G = 1000 kg/(m2·s), q w = 245 kW/m2.
Fig. 6. (a) Local inner wall T w, in, (b) Bu , (c) Ac distributions with bulk fluid enthalpy i b (NHT, normal heat transfer; HTD, heat transfer deterioration).
Fig. 7. Gr and Re 2.7 distribution at different mass flow rates
Fig. 8. Radial expansion model of supercritical fluids based on pseudo-boiling.
Fig. 9. Supercritical boiling number distinguishes the two regimes of heat transfer.
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Table 1. Accuracies and ranges of measuring instruments.
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