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KMID : 0371819970290010035
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Nuclear Engineering and Technology
1997 Volume.29 No. 1 p.35 ~ p.44
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An Empirical Correlation for Critical Flow Rates of Subcooled Water Through Short Pipes with Small Diameters
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Park, Choon-Kyung
Park, Jee-Won/Chung, Moon-Ki
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Abstract
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Critical two-phase flow rates of subcooled water through short pipes (L≤400 mm) with small diameters (D≤7.15 mm) have been experimentally investigated for wide ranges of subcooling (0~199℃) and pressure (0.5~2.0 MPa). To examine the effects of various parameters (i.e., the location of flashing inception, the degree of subcooling, the stagnation temperature and pressure, and the pipe size) on the critical two-phase flow rates of subcooled water through short pipes with small diameters, a total of 135 runs were made for various combinations of test parameters using four different LID test sections. Experimental results that show effects of various parameters on subco!ed critical two-phase flow rates are presented in the form of graphs such as the dimensionless mass flux (G*) versus the dimensionless subcooling (T*sub) curve. An empirical correlation expressed in terms of a dimensionless subcooling is also obtained for subcooled two-phase flow rates through present test sections. Comparisons between the mass fluxe calculated by present correlation and a total of 755 selected experimental data points of 9 different investigators show that the agreement is fairly good except for very low subcooling data obtained from small LID (less than 10) orifices.
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KEYWORD
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