学术
摘 要:
ONB和OSV分别是过冷流动沸腾中气泡形成的初始位置及气泡开始挣脱壁面的位置，准确预测ONB及OSV的位置对于分析低温液体的流动沸腾过程具有十分重要的意义。根据传热机理的不同将低温液体过冷流动沸腾通道划分为3个区，建立了各区内沸腾传热的机理模型及各区边界的判断标准，并将新建立的理论模型纳入双流体模型实现了数值求解，根据数值计算的结果可以很方便地判断ONB及OSV的位置。建立的模型有助于从机理上实现低温液体过冷流动沸腾传热的准确预测。[著者文摘]
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文章出处:
《低温工程》-2006年1期,20 -6-11,20页
文献标识码:
A
文章编号:
1000-6516（2006）01-0006-06
Numerical model for subcooled boiling flow of cryogenic liquid in vertical channels
Li Xiangdong, Wang Rongshun, Shi Yumei （Institute of Refrigeration and Cryogenics, Shanghai Jiaotong University, Shanghai 200030,China）
Abstract:
Determination of location of Onset of Nucleate Boiling （ONB） and that of Onset of Significant Void （OSV） is of great importance in analyzing subcooled boiling flow, since downstream ONB and OSV new heat transfer mechanism come to play. The heating wall of a vertical channel was divided into three sequential regions, each including different heat transfer mechanism. A mechanism model for quantifying the heat flux partitions in each region was developed and the boundaries between them were identified. The new model was then incorporated in the two-fluid model and the numerical simulation was performed. The locations of ONB and OSV can be easily decided according to the numerical results. The numerical results are helpful to a better understanding of the physical mechanism of subcooled nucleate boiling.[著者文摘]
Key words:
cryogenic liquid ; subcooled flow boiling ; heat transfer mechanism ; onset of nucleate boiling （ONB） ; onset of significant void （OSV）
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