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Impact of Coil Curvature, Pitch, and Orientation on Vapor Hydrodynamics over Helically Coiled Tubes during Saturated Pool Boiling near Critical Pressure
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2023-10-16 , DOI: 10.1021/acs.iecr.3c02629 Naveen Kushwaha 1 , Vimal Kumar 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2023-10-16 , DOI: 10.1021/acs.iecr.3c02629 Naveen Kushwaha 1 , Vimal Kumar 1
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Temporal tracking of the interface with mass transfer phenomena is very complex during the boiling process. In this paper, the physics of two-phase boiling phenomena of water around the heated surface of a helically coiled tube at a critical pressure (Psat = 21.9 MPa) has been predicted numerically. Such high-pressure systems are usually observed in boiling water reactors (BWRs). The boiling heat transfer characteristics were studied on eight different helically coiled heated surfaces with varying curvature ratios (δ) from 0 to 7.16 and coiled tube orientations (vertical and horizontal) at a degree of superheat (ΔT) of 10 K. The vapor bubble dynamics, i.e., bubble merging, sliding over the surface, and departure, have been studied over the heated helical surface. Although having vapor blanketing over the surface, the coil having zero curvature (straight tube) possesses a higher velocity and generation of vapor phase among all considered cases. The orthogonality of the surface normal and gravitation force makes the vapor move faster. Thus, the H1 (horizontally oriented tube) configuration possesses 3.79 times higher average velocity than the H4 coiled tube configuration. Vertical configuration, i.e., a helically coiled tube (V4) with a curvature ratio (δ = 0) produced 4.4 times higher vapor than that produced by a horizontally oriented helically coiled (H4) configuration. Thus, curvature and orientation play a critical role in fluid dynamics, heat transfer, and vapor volume production.
中文翻译：
接近临界压力的饱和池沸腾过程中，盘管曲率、节距和方向对螺旋管上蒸汽流体动力学的影响
在沸腾过程中，具有传质现象的界面的时间跟踪非常复杂。本文对临界压力（P sat = 21.9 MPa）下螺旋管受热表面周围水的两相沸腾现象的物理现象进行了数值预测。这种高压系统通常出现在沸水反应堆（BWR）中。研究了八个不同的螺旋盘管受热表面的沸腾传热特性，这些受热表面具有从 0 到 7.16 的不同曲率比 (δ) 以及过热度 (Δ T ) 为 10 K 的盘管方向（垂直和水平）。动力学，即气泡合并、在表面滑动和离开，已经在加热的螺旋表面上进行了研究。尽管在表面上具有蒸汽覆盖，但在所有考虑的情况中，具有零曲率的盘管（直管）具有更高的速度和蒸汽相的产生。表面法线和重力的正交性使得蒸汽移动得更快。因此，H1（水平定向管）配置的平均速度比 H4 盘管配置高 3.79 倍。垂直配置，即曲率比（δ=0）的螺旋盘管（V4）产生的蒸汽比水平定向螺旋盘管（H4）配置产生的蒸汽高4.4倍。因此，曲率和方向在流体动力学、传热和蒸汽量产生中起着至关重要的作用。
更新日期：2023-10-16
中文翻译：
接近临界压力的饱和池沸腾过程中，盘管曲率、节距和方向对螺旋管上蒸汽流体动力学的影响
在沸腾过程中，具有传质现象的界面的时间跟踪非常复杂。本文对临界压力（P sat = 21.9 MPa）下螺旋管受热表面周围水的两相沸腾现象的物理现象进行了数值预测。这种高压系统通常出现在沸水反应堆（BWR）中。研究了八个不同的螺旋盘管受热表面的沸腾传热特性，这些受热表面具有从 0 到 7.16 的不同曲率比 (δ) 以及过热度 (Δ T ) 为 10 K 的盘管方向（垂直和水平）。动力学，即气泡合并、在表面滑动和离开，已经在加热的螺旋表面上进行了研究。尽管在表面上具有蒸汽覆盖，但在所有考虑的情况中，具有零曲率的盘管（直管）具有更高的速度和蒸汽相的产生。表面法线和重力的正交性使得蒸汽移动得更快。因此，H1（水平定向管）配置的平均速度比 H4 盘管配置高 3.79 倍。垂直配置，即曲率比（δ=0）的螺旋盘管（V4）产生的蒸汽比水平定向螺旋盘管（H4）配置产生的蒸汽高4.4倍。因此，曲率和方向在流体动力学、传热和蒸汽量产生中起着至关重要的作用。
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