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Comparison of CHF measurements in R-l34a cooled tubes and the water CHF look-up table

机译:R-134a冷却管中的CHF测量值与水CHF查找表的比较

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An exhaustive experimental study of the critical heat flux (CHF) in R-l34a-cooled tubes has been recently completed. The objective of this study was to provide a consistent set of CHF data to be used as a reference for future separate effect studies. The investigated range of flow parameters in R-l34a was f outlet pressure 0.96 2.39 MPa (equivalent to 6 l4 MPa in water), mass flux 500 3000 kg m~2 s ~l (equivalent to 700--4300 kg m~-2 s~-1 in water), and critical quality --0.l to +0.9. To extend the range of critical qualities. different heated lengths (0.45 2 m) and two-phase flow at inlet to the test section were used. Scaling laws were applied to convert the standard CHF look-up table from water to R-l34a equivalent conditions. The comparison of the data with the water-based look- up table showed that for high mass fluxes , the look-up table provides an excellent CHF prediction for R-134a-cooled tubes.
机译:最近已经完成了对R-13a冷却管中的临界热通量(CHF)的详尽实验研究。这项研究的目的是提供一致的CHF数据集,以作为将来单独效果研究的参考。 R-134a中流动参数的研究范围为出口压力0.96 2.39 MPa(相当于水中的61.4 MPa),质量通量500 3000 kg m〜2 s〜l(相当于700--4300 kg m〜-2水中的s〜-1)和临界质量--0.1至+0.9。扩大关键质量的范围。使用了不同的加热长度(0.45 2 m)和测试段入口处的两相流。应用比例定律将标准的CHF查询表从水转换为R-134a等效条件。数据与水基查找表的比较表明,对于高通量,该查找表为R-134a冷却管提供了出色的CHF预测。

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