[논문]Effects of Pool Subcooling on Boiling Heat Transfer in an Annulus

Kang, Myeong-Gie

Effects of Pool Subcooling on Boiling Heat Transfer in an Annulus 원문보기

Journal of the Korean Nuclear Society = 원자력학회지, v.36 no.5, 2004년, pp.460 - 474

Kang, Myeong-Gie (Andong National University)

Abstract ▼ AI-Helper

Effects of liquid subcooling on pool boiling heat transfer in an annulus with an open bottom have been investigated experimentally. A tube of 19.1mm diameter and the water at atmospheric pressure have been used for the fest. Up to $50^{\circ}C$ of liquid subcooling has been tested and experimental data of the annulus have been compared with the data of a single unrestricted tube. Temperatures on the heated tube surface fluctuate only slightly regardless of the heat flux in the annulus, whereas high variation is observed on the surface of the single tube. An increase in the degree of subcooling decreases heat transfer coefficients greatly both for the single tube and the annulus. Heat transfer coefficients increase suddenly at ${\Delta}T_{sub}\;{\le}\;10^{\circ}C$ and much greater change in heat transfer coefficients is observed at the annulus. To obtain effects of subcooling on heat transfer quantitatively, two new empirical equations have been suggested, and the correlations predict the empirical data within ${\pm}30\%$ error bound excluding some data at lower heat transfer coefficients.

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가설 설정

1. The slopes of the curves of heat flux versus average tube surface temperature for the annulus are much steeper than those of the single tube. Change in q" from 10 to 110 kW/m2 results in a 19.
2. The heat transfer coefficient increased as subcooling decreased regardless of the tube conditions. The rate of increase in the heat transfer coefficient was larger for the annulus.

이론/모형

To quantify the effects of subcooling on pool boiling heat transfer coefficients all experimental data were curve-fitted using the least square method, and the results are shown in Fig. 12. According to the results, the heat transfer coefficients for the single tube and the annulus can be correlated as =0.

성능/효과

3. To obtain effects of subcooling on heat transfer quantitatively, new empirical equations of hb ^.22q 088e 006 3泌顷 and hb =^0.53q 076e015 d TsuMj-025 are suggested for the single tube and the annul_니s, respectively, and the correlations predict the empirical data within +30% error bound.

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상세보기
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