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題名 | 低壓力、低流量、低蒸汽乾度狀況下臨界熱通率理論預估模式之新發展=An Improved Theoretical Critical Heat Flux Model of Low Pressure, Low Mass Flux and Low Quality Conditions |
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作者姓名(中文) | 涂光權; 白寶實; 喻冀平; | 書刊名 | 核子科學 |
卷期 | 35:1 1998.02[民87.02] |
頁次 | 頁29-48 |
分類號 | 449.2 |
關鍵詞 | 低壓力; 低流量; 低蒸汽乾度; 臨界熱通率; 核子工程; Critical heat flux; Sublayer dryout model; Low pressure/low mass flux; |
語文 | 中文(Chinese) |
英文摘要 | An improved theoretical critical heat flux (CHF) model is developed for the application at the thermal-hydraulic conditions of low pressure (i.e., 0.4 to 3.45 MPa), low mass flux (i.e., 6 to 938 kg/m□s), subcooled and low quality (i.e., <0.25) upward flow through vertical tubes. The prediction of CHF in these conditions is especially important to safety analysis of commercial nuclear power plant accidents and of research reactor normal operation. From the review of CHF experimental data at low pressure and low mass flux conditions, two types of CHF mechanisms, namely, local sublayer dryout and flooding type film dryout, are proposed in this paper. Present model is developed based on the sublayer dryout mechanisms with improvement of bubble size prediction and vapor blanket formation to reveal more solid theoretical bases in the physical standpoint. Present model has achieved a reasonably good predictive results in comparison with previous model of Ho, Tu, Pei & Chang and the well-known correlations such as Thompson & MacBeth and Labuntsov et al. |
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