The present research is concerned with the experimental work on R-410A subcooled flow boiling in horizontal annuli. Firstly, boiling curves and boiling heat transfer coefficients are used to explore effects of input heat flux (q), liquid mass flux (G), inlet refrigerant subcooling (ΔT_sub), saturation temperature (T_sat) and annular gap (δ). The results indicate the obvious temperature drop occurs during onset of nucleate boiling (ONB) and increasing G and ΔT_sub enlarges the temperature undershoot. With the increasing q, the heat transfer coefficient is raised apparently. Higher ΔT_sub and larger δ both lead to lower boiling heat transfer coefficients, but varying G and T_sat has small influence on the boiling heat transfer. Secondly, the visualization of bubble behavior discloses increasing q improves bubble size, formation, and departure. With the increase in G, ΔT_sub, T_sat and δ, the bubble growth is suppressed, leading to the reduction in bubble detachment diameter (d_p). Moreover, the bubble detachment frequency (f_b) and mean density of active nucleation site (N_ac) are reduced with either the increase in ΔT_sub and δ or the decrease in T_sat. Finally, empirical correlations are proposed for d_p, f_b, N_ac, and total heat flux, which yields satisfactory agreement with our measured data.

目前的研究与水平环空R-410A过冷流沸腾的实验研究有关。首先，沸腾曲线与沸腾传热系数被用来探索输入的热通量（效果q），液体的质量通量（ģ），入口制冷剂过冷（ΔT_子），饱和温度（Ť_饱和）和环形间隙（δ）。结果表明泡核沸腾（ONB）的发病过程中发生明显的温度下降和增加ģ和ΔT_子放大的温度下冲。随着q的增加，传热系数明显提高。更高的ΔT_子和较大的δ都导致较低的沸腾传热系数，但改变ģ和Ť_饱和对沸腾传热小的影响。其次，气泡行为的可视化显示增加q可以改善气泡大小，形成和离开。随着增加ģ， ΔT_子， Ť_坐着和δ中，气泡的生长被抑制，导致气泡脱离直径（减速d _p）。此外，气泡脱离频率（ f _b）和活性成核位点的平均密度（ N_AC）与无论是在增加而降低ΔT_子和δ或减少Ť_坐着。最后，提出了d _p， f _b， N _ac和总热通量的经验相关性，这与我们的测量数据产生了令人满意的一致性。