Validation and Analysis of Two-group Interfacial Area Transport Model for Rectangular Channel
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摘要: 为了验证矩形通道双群组界面浓度输运模型的准确性与适用性,采用四探头电导探针测量方法,对竖直条件下矩形通道内气液两相界面输运特性开展了试验研究,获得了大量时均空泡份额、界面浓度等试验数据。试验在常温常压条件下进行,工质为空气-水,本体采用透明亚克力材质,尺寸为10 mm×200 mm,气、液相折算速度范围分别为0.047 ~2.014 m/s和0.315 ~4.416 m/s,流型范围覆盖泡状流、帽状湍流和搅混流区域。在此基础上,选取了8种试验工况对矩形通道双群组界面浓度输运模型进行验证,对影响界面浓度输运模型的气泡相互作用机制进行了分析。结果表明,群组1和群组2气泡界面浓度和空泡份额相对误差均在±10%以内,验证了矩形通道双群组界面浓度输运模型的正确性。
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关键词:
- 矩形通道 /
- 界面浓度 /
- 空泡份额 /
- 双群组界面浓度输运模型
Abstract: In order to demonstrate the accuracy and applicability of the two-group interfacial area transport model for rectangular channel, the transport characteristics of gas-liquid two-phase interface in rectangular channel under vertical condition were experimentally studied by using four-probe conductivity probe measurement method, and a large number of experimental data such as time-average void fraction and interfacial area concentration were obtained. The experiment was conducted in normal temperature and pressure with water and air as the working medium. The test sections of the channel were made of transparent acrylic material with a cross section of 10 mm×200 mm, and converted velocities of gas and liquid were 0.047-2.014 m/s and 0.315-4.416 m/s, respectively. Flow patterns involve bubbly flow, cap-turbulent flow and churn flow. On this basis, eight experimental conditions were selected to verify the two-group interfacial area transport model for rectangular channel, and the bubble interaction mechanism affecting the interfacial area transport model was analyzed. The results show that the relative errors of bubble interfacial area concentration and void fraction in group 1 and group 2 are within 10%, which verifies the correctness of the two-group interfacial area transport model for rectangular channel. -
表 1 验证工况数据
Table 1. Validation Condition Data
序号 工况点 液相折算
速度/(m·s−1)气相折算
速度/(m·s−1)流型 1 工况1(Run1) 0.315 0.047 泡状流 2 工况2(Run2) 0.946 0.047 泡状流 3 工况3(Run3) 1.893 0.095 泡状流 4 工况4(Run4) 0.946 0.188 泡状流 5 工况5(Run5) 1.893 0.193 泡状流 6 工况9(Run9) 4.416 0.936 泡状流 7 工况14(Run14) 0.631 0.418 帽状湍流 8 工况19(Run19) 1.893 0.967 搅混流 -
[1] 刘航. 棒束结构通道内两相流界面输运特性及理论模型[D]. 重庆: 重庆大学,2018. [2] KIM S, ISHII M, WU A, et al. Interfacial structures of confined air-water two-phase bubbly flow[J]. Experimental Thermal and Fluid Science, 2002, 26(5): 461-472. doi: 10.1016/S0894-1777(02)00152-8 [3] KIM S, SUN X D, ISHII M, et al. Interfacial area transport and evaluation of source and sink terms for confined air-water bubbly flow[J]. Nuclear Engineering and Design, 2003, 219(1): 61-75. doi: 10.1016/S0029-5493(02)00289-3 [4] SUN X D, KIM S, ISHII M, et al. Modeling of bubble coalescence and disintegration in confined upward two-phase flow[J]. Nuclear Engineering and Design, 2004, 230(1-3): 3-26. doi: 10.1016/j.nucengdes.2003.10.008 [5] SUN X D. Two-group interfacial area transport equation for a confined test section[D]. West Lafayette: Purdue University, 2001. [6] 于洋,宋小明,刘东,等. 矩形通道双群组界面浓度输运模型与验证方法研究[J]. 核动力工程,2021, 42(S1): 113-120. doi: 10.13832/j.jnpe.2021.S1.0113 [7] ISHII M. Thermo-fluid dynamic theory of two-phase flow[M]. Eyrolles: Direction des Etudes et Re-cherches d’Electricité, 1975,217-240 . [8] WU Q, KIM S, ISHII M, et al. One-group interfacial area transport in vertical bubbly flow[J]. International Journal of Heat and Mass Transfer, 1998, 41(8-9): 1103-1112. doi: 10.1016/S0017-9310(97)00167-1 [9] KIM S. Interfacial area transport equation and measurement of local interfacial characteristics[D]. West Lafayette: Purdue University, 1999. [10] WOROSZ T S. interfacial area transport equation for bubbly to cap-bubbly transition flows[D]. State College: The Pennsylvania State University, 2015.