Simulation study on transient two phase flow in cryogenic tube chill-down process
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摘要:
为揭示低温管路预冷两相流态与沸腾换热的瞬变规律,建立了低温管路预冷瞬变过程的计算流体动力学(CFD)数值模型,采用不同传热模型考虑预冷不同阶段的流-固耦合换热速率。研究发现,低温管路预冷根据管内流态可分为液面抬升、膜态沸腾、过渡及核态沸腾、液面上涨至满液共4个阶段。在管内两相流发展过程中,受重力影响,管截面表现为局部“上翘”式反环状流、主体分层流的流型特征,其中,底部与侧壁气膜厚度分别由0.093 mm和0.124 mm波动减薄。截面内最大温差达90 K,进出口最大温差约50 K。由于管内存在膜态沸腾向过渡沸腾、核态沸腾转变区,可能造成局部含气率突增。
Abstract:To reveal the transient properties of two-phase flow and boiling heat transfer in cryogenic tube chill-down process, a computational fluid dynamics (CFD) model to account for transient variations in the cryogenic chill-down event was developed. In this CFD model, different heat transfer models were selected to calculate fluid-solid coupling heat transfer rates at different stages of chill-down. The results showed that the flow patterns inside the tube could be divided into four stages, including liquid level rising, film boiling, transition and nucleate boiling, and pipe flooding. Due to the influence of gravity in the development of the interior two-phase flow, the distribution of a general stratified flow with local “upwarped” appeared at the liquid surface position near the tube wall. The thicknesses of the vapor film at the bottom and side wall decreased fluctuatingly from 0.093 mm and 0.124 mm, respectively. Moreover, it was found that the maximum temperature difference at the cross section was about 90 K, and the temperature difference between the tube inlet and outlet reached about 50 K. Owing to the transition from film boiling to transition and nucleate boiling, the local void fraction could increase significantly.
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表 1 低温管路预冷仿真所采用换热模型
Table 1. Heat transfer models in cryogenic tube chill-down calculation
物理量 模型 公式 备注 f (αl) Ioilev模型[28] $ f ({{\alpha _{\text{l}}}} ) = 1 - \max \left[ {0,\min \left( {\dfrac{{0.1 - {\alpha _{\text{l}}}}}{{0.05}},1} \right)} \right] $ 判断液相或气相换热 qc,qv Jayatilleke模型[29] ${q_{\text{c}}} = \dfrac{{{\rho _{\text{l}}}{c_{{{p{\mathrm{l}}}}}}{u_{{\text{lw}}}}}}{{{T_{{\text{lw}}}}}}\quad\quad{q_{\text{v}}} = \dfrac{{{\rho _{\text{v}}}{c_{{{p{\mathrm{v}}}}}}{u_{{\text{vw}}}}}}{{{T_{{\text{vw}}}}}}$ 基于对流换热原理提出 TMHF Darr模型[30] ${T_{{\text{MHF}}}} = 0.844{T_{{\text{cr}}}}\left[ {1 + 0.06\left( {\dfrac{{{\rho _{\text{l}}}{u_{\text{l}}}{D_{\text{i}}}}}{\sigma }} \right)} \right]$ 适用于液氮 TCHF Kalinin模型[31] $\dfrac{{{T_{{\text{CHF}}}} - {T_{{\text{sat}}}}}}{{{T_{{\text{cr}}}} - {T_{\text{l}}}}} = 0.1 + 1.5\sqrt \beta + 0.6{\beta ^2}\quad\quad \beta = \sqrt {\dfrac{{{k_{\text{l}}}{\rho _{\text{l}}}{c_{{{p{\mathrm{l}}}}}}}}{{{k_{\text{w}}}{\rho _{\text{w}}}{c_{{{p{\mathrm{w}}}}}}}}} $ 适用于液氮 hfilm Breen-Westwater
修正模型[32]$\begin{gathered} {h_{{\text{film}}}} = \left[ {0.37 + 0.28{{\left( {\dfrac{\sigma }{{gD_{\text{i}}^{\text{2}}\Delta \rho }}} \right)}^{0.5}}} \right]{\left( {\dfrac{\sigma }{{g\Delta \rho }}} \right)^{ - 0.125}}{\left[ {\dfrac{{{\mu _{\text{v}}} ( {{T_{\text{w}}} - {T_{{\text{sat}}}}} ) }}{{k_{\text{v}}^{\text{3}}{\rho _{\text{v}}}\Delta \rho g{\lambda '}}}} \right]^{ - 0.25}} \\ {\lambda '} = \dfrac{{{{\left[ {\lambda + 0.34{c_{{{p{\mathrm{v}}}}}} ({{T_{\text{w}}} - {T_{{\text{sat}}}}} ) } \right]}^2}}}{\lambda } \\ \end{gathered} $ 适用于液氮 qCHF Wang模型[16],
Tatsumoto修正模型[33]$\begin{gathered} {q_{{\text{CHF}}}} = 0.486G\lambda {\left( {\dfrac{{{\rho _{\text{v}}}}}{{{\rho _{\text{l}}}}}} \right)^{0.635\;3}}{\left( {\dfrac{{{\rho _{\text{l}}}\sigma }}{{{G^2}L}}} \right)^{0.498\;7}}{\left( {\dfrac{L}{{{D_{\text{i}}}}}} \right)^{0.311\;2}} \\ {q_{{\text{CHF,sub}}}} = \left[ {1 + 0.23{{\left( {\dfrac{{{\rho _{\text{v}}}}}{{{\rho _{\text{l}}}}}} \right)}^{0.8}}\left( {\dfrac{{{c_{{{p{\mathrm{l}}}}}}\Delta {T_{{\text{sub}}}}}}{\lambda }} \right)} \right]{q_{{\text{CHF}}}} \\ \end{gathered} $ 适用于液氮[34] qMHF Jeschar模型[35] ${q_{{\text{MHF}}}} = 0.16{\rho _{\text{v}}}\lambda {\left[ {\dfrac{{g\sigma \Delta \rho }}{{{{ ( {{\rho _{\text{l}}} + {\rho _{\text{v}}}} ) }^2}}}} \right]^{0.25}}$ 适用于液氮[32] db He模型[36] ${d_{\text{b}}} = 7.2 \times {10^{ - 0.433}}{\left( {\dfrac{{{\rho _{\text{v}}}}}{{{\rho _{\text{l}}}}}} \right)^{ - 0.018}}{\left[ {\dfrac{{{c_{{{p{\mathrm{l}}}}}}\left( {{T_{\text{w}}} - {T_{{\text{sat}}}}} \right)}}{\lambda }} \right]^{0.32}}R{e^{ - 0.3}}$ 适用于低温液体[37]:水力直径为1~42.4 mm、质量流速为67~ 1927 kg/(m2·s)$ \tilde n $ Kirichenko模型[38] $\tilde n = \left\{ \begin{gathered} {10^{ - 7}}{\left[ {\dfrac{{\lambda {\rho _{\text{v}}} ( {{T_{\text{w}}} - {T_{{\text{sat}}}}} ) }}{{\sigma {T_{{\text{sat}}}}}}} \right]^2}\quad\quad\quad\quad\quad p/{p_{{\text{cr}}}} \geqslant 0.04 \\ 625 \times {10^{ - 16}}{\left[ {\dfrac{{\lambda {\rho _{\text{v}}} ( {{T_{\text{w}}} - {T_{{\text{sat}}}}} ) }}{{\sigma {T_{{\text{sat}}}}}}} \right]^3}\quad\;\quad p/{p_{{\text{cr}}}} < 0.04 \\ \end{gathered} \right.$ 适用于液氮[39] fb Cole模型[40] ${f_{\text{b}}} = \sqrt {\dfrac{{4g ({{\rho _{\text{l}}} - {\rho _{\text{v}}}} ) }}{{3{\rho _{\text{l}}}{d_{\text{b}}}}}} $ 确定气泡脱落频率[22] 表 2 模拟参数取值
Table 2. Values of simulation parameters
参数 数值或说明 管路内径Di/mm 11.68 管路外径Do/mm 12.70 管长L/m 0.572 入口压力/MPa 0.298 质量流速/(kg/(m2·s)) 169 入口液氮过冷度ΔTsub/K 0.9 管壁比定压热容cpw/(J/(kg·K)) 由式(4)确定 管壁热导率kw/(W/(m·K)) 由式(5)确定 重力加速度g/(m/s) 9.81 -
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