Study on Two-Phase Hydrodynamic Structure of Bubble Layers under Forced Convective Subcooled Flow Boiling

强制对流过冷流沸腾下气泡层两相流体动力结构研究

• 批准号: 08458124
• 负责人: SERIZAWA Akimi
• 金额: $ 4.93万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08458124/
• 关键词: Subcooled boiling; Bubble layers; Two-phase flow structure; Critical heat flux; Film flow; Experiment; Numerical simulation; Physical models; サブク-ル沸騰; 解析的モデル; 強制対流; 熱伝達; CHF

The initial research plan has been extended to cover, not only multi-fluid hydrodynamic structure of bubble layers, but also wider aspects of forced convection subcooled flow boiling and critical heat flux both experimentally and analytically. This includes (1) bubble behaviors under conditions up to the DNB point, (2) phase distribution and turbulence mechanisms in various channels, (3) 2-dimensional time-dependent film flow behavior, (4) turbulent dispersion of liquid droplets in turbulent shear flow field, awl (5) prediction of the DNB and film dryout.Experimental observations have revealed several different mechanisms dominating bubble lateral migrations, resulting in non-uniform distributions of phases and turbulence. These general trends were successfully predicted by numerical simulations. We also developed an analytical model to numerically predict critical heat fluxes (DNB and dryout heat flux) based on multi-fluid models. In order for these models to incorporate more accurately the effects of time-dependent spatially varying film thickness and liquid droplets behavior in turbulent gas flow, we have developed a new ultrasonic echo technique with high spatial and time resolutions and a numerical simulation model to calculate deposition and turbulent diffusion of liquid droplets based on two-way coupling method. The latter method has been shown to be a good tool to objectively evaluate the validity of existing correlations.

最初的研究计划已经扩展到涵盖，不仅多流体的气泡层的流体动力学结构，但也更广泛的方面的强制对流过冷流动沸腾和临界热流密度的实验和分析。这包括（1）在DNB点之前的气泡行为，（2）在各种通道中的相分布和湍流机制，（3）二维随时间变化的膜流行为，（4）液滴在湍流剪切流场中的湍流分散，awl（5）DNB和膜干燥的预测。实验观察揭示了几种不同的控制气泡横向迁移的机制，导致相和湍流的不均匀分布。数值模拟成功地预测了这些一般趋势。我们还开发了一个分析模型来数值预测临界热通量（DNB和干涸热通量）的基础上多流体模型。为了使这些模型更准确地纳入随时间变化的空间膜厚和液滴的行为在湍流气体流动的影响，我们已经开发了一种新的超声回波技术，具有高的空间和时间分辨率和数值模拟模型计算液滴沉积和湍流扩散的基础上双向耦合方法。后一种方法已被证明是一个很好的工具，客观地评估现有的相关性的有效性。

项目成果

I.Kataoka, S.Kodamal, A.Tomiyama and A.Serizawa: "Study on Analytical Prediction of Forced Convective CHF Based on Multi-Fluid Model" Nuclear Engineering and Design. Vol.175. 197-117 (1997)

I.Kataoka、S.Kodamal、A.Tomiyama 和 A.Serizawa：“基于多流体模型的强制对流 CHF 分析预测研究”核工程与设计。

T.Kamei and A.Serizawa: "Measurement of 2-Dimensional Local Instantaneous Liquid Film Thickness around Simulated Nuclear Fuel Rod by Ultrasonic Transmission Technique" Nuclear Engineering and Design. Vol.184. 349-362 (1998)

T.Kamei 和 A.Serizawa：“通过超声波传输技术测量模拟核燃料棒周围二维局部瞬时液膜厚度”核工程与设计。

Z.Kawara, I.Kataoka, A.Serizawa, Y.J.Ko and O.Takahashi: "Forced Convective CHF Based on Two-Fluid and Three-Fluid Model" Heat Transfer 1998. Vol.2. 103-108 (1998)

Z.Kawara、I.Kataoka、A.Serizawa、Y.J.Ko 和 O.Takahashi：“基于二流体和三流体模型的强制对流 CHF”传热 1998 年。第 2 卷。

I.Kataoka et al.: "Study on Analytical Prediction of Forced Convective CHF Based on Multi-Fluid Model" Proc.of the Japan-VS Seminar on Two-Phase Flow Dynanics,July 15-20,1996. 145-152 (1996)

I.Kataoka等：“基于多流体模型的强制对流CHF分析预测研究”日本-VS两相流动力学研讨会论文集，1996年7月15-20日。

Kataoka,I.et al.: "Study on Analytical Prediction of Forced Convective CHF Based on Muleti-Fluid Model" Nuclean Engineering and Design. (受理済み). (1997)

Kataoka,I.et al.：“基于多流体模型的强制对流 CHF 分析预测研究”核工程与设计（已接受）。