International Journal of Multiphase Flow最新文献

Uncertainty quantification for the drag reduction of microbubble-laden fluid flow in a horizontal channel 水平通道中含微气泡流体流动阻力减小的不确定性量化

IF 3.6 2区工程技术

International Journal of Multiphase Flow Pub Date : 2024-11-16 DOI: 10.1016/j.ijmultiphaseflow.2024.105059

Byeong-Cheon Kim , Kyoungsik Chang , Sang-Wook Lee , Jaiyoung Ryu , Minjae Kim , Jaemoon Yoon

{"title":"Uncertainty quantification for the drag reduction of microbubble-laden fluid flow in a horizontal channel","authors":"Byeong-Cheon Kim , Kyoungsik Chang , Sang-Wook Lee , Jaiyoung Ryu , Minjae Kim , Jaemoon Yoon","doi":"10.1016/j.ijmultiphaseflow.2024.105059","DOIUrl":"10.1016/j.ijmultiphaseflow.2024.105059","url":null,"abstract":"<div><div>Over three decades, much research has proven the bubble drag reduction (BDR) technique. Recently, the improvement of computing performance has enabled the simulation of multi-phase flows. The present work simulated the microbubble-laden turbulent horizontal channel flow by Nek5000 code, which is based on the spectral element method. To resolve the microbubble dynamics, the 2-way coupling Euler–Lagrange approach was combined with Nek5000 code. Furthermore, for high accuracy, high-order Lagrange interpolation was adopted to track the microbubble's location and velocity in this code. All microbubbles were assumed as non-deformable, spherical, and immiscible. For the investigation of the drag reduction effect of microbubble size and the number of microbubbles, the uncertainty quantification (UQ) method was adopted with the non-intrusive polynomial chaos method. The Latin hypercube sampling method was used to obtain precision with lesser number of samples than the Monte Carlo method. The distribution of random variables was assumed to be Gaussian and generalized polynomial chaos expansion (gPC) was applied to build the surrogate model. The mean value (μ) of random variables was 110 µm, 6,345 each, while the standard deviation (σ) was ± 0.33 μ. As a result, the uncertainty propagation of velocity, second-order turbulence statistics, and drag reduction were achieved.</div></div>","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":"182 ","pages":"Article 105059"},"PeriodicalIF":3.6,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Two-phase flows downstream, upstream and within Plate Heat Exchangers 板式换热器下游、上游和内部的两相流

IF 3.6 2区工程技术

International Journal of Multiphase Flow Pub Date : 2024-11-14 DOI: 10.1016/j.ijmultiphaseflow.2024.105062

F.J. Santos , L. Beckedorff , T.S. Possamai , K.V. Paiva , J. L.G. Oliveira

{"title":"Two-phase flows downstream, upstream and within Plate Heat Exchangers","authors":"F.J. Santos , L. Beckedorff , T.S. Possamai , K.V. Paiva , J. L.G. Oliveira","doi":"10.1016/j.ijmultiphaseflow.2024.105062","DOIUrl":"10.1016/j.ijmultiphaseflow.2024.105062","url":null,"abstract":"<div><div>Air-water flows were assessed within Plate Heat Exchangers (PHE) with the aid of fast camera imaging. Tests occurred in transparent setups with three chevron angle arrangements (30<sup>o</sup>/30<sup>o</sup>, 30<sup>o</sup>/60<sup>o</sup> and 60<sup>o</sup>/60<sup>o</sup>), representative of low, in-between and high pressure drop channels. Evaluation upstream the PHE inlet happened with Electrical Capacitance Tomography. Three patterns were tested: bubbly, slug and stratified. The effects of flow direction, superficial fluid velocities, two-phase pattern, and chevron angle arrangement on air-water distributions were assessed. The PHE channel outlet is characterized by intense flow recirculation. Bubble entrapment occurs in the core of the recirculation zones. Energy dissipation processes along the PHE channel flow affect the inlet gaseous content, intensifying the mixing process of air and water phases, particularly at flow distribution areas owing to the occurrence of flow acceleration and deceleration. Bubble distribution is wide since the break-up process is rather heterogeneous. Prediction of the maximum bubble diameter was obtained with a modification to Hinze's model. Coalescence can occur with small liquid superficial velocities. At the exit manifold, the recirculation zones affect the two-phase pipe flow. In addition to swirling decay, two-phase flow features and gravitational forces need to be accounted to determine the necessary pipe length to attain stationary process.</div></div>","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":"182 ","pages":"Article 105062"},"PeriodicalIF":3.6,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A simple and efficient finite difference scheme to the Cahn–Hilliard–Navier–Stokes system equations 卡恩-希利亚德-纳维尔-斯托克斯系统方程的简单高效有限差分方案

IF 3.6 2区工程技术

International Journal of Multiphase Flow Pub Date : 2024-11-10 DOI: 10.1016/j.ijmultiphaseflow.2024.105061

Mingguang Shen , Ben Q. Li

引用次数: 0

A simple explicit thermodynamic closure for multi-fluid simulations including complex vapor–liquid equilibria: Application to NH3 H2O mixtures 用于包括复杂汽液平衡在内的多流体模拟的简单显式热力学封闭：在 NH3 H2O 混合物中的应用

IF 3.6 2区工程技术

International Journal of Multiphase Flow Pub Date : 2024-11-09 DOI: 10.1016/j.ijmultiphaseflow.2024.105044

J. Carmona , I. Raspo , V. Moureau , P. Boivin

引用次数: 0

Study on aerodynamic breakup of non-Newtonian liquid droplets and the distribution characteristics of their sub-droplets 非牛顿流体液滴的空气动力破裂及其子液滴分布特征研究

IF 3.6 2区工程技术

International Journal of Multiphase Flow Pub Date : 2024-11-07 DOI: 10.1016/j.ijmultiphaseflow.2024.105039

Lijuan Qian , Lijun Cheng , Chengbin Sun , Li Lv

{"title":"Study on aerodynamic breakup of non-Newtonian liquid droplets and the distribution characteristics of their sub-droplets","authors":"Lijuan Qian , Lijun Cheng , Chengbin Sun , Li Lv","doi":"10.1016/j.ijmultiphaseflow.2024.105039","DOIUrl":"10.1016/j.ijmultiphaseflow.2024.105039","url":null,"abstract":"<div><div>In industrial applications, the secondary breakup of droplets and the size distribution of their sub-droplets are crucial for atomization performance indicators. In this work, a high-speed digital camera is utilized to experimentally and theoretically study the secondary breakup process of xanthan gum (XG) droplets and the size distribution changes of resulting sub-droplets in continuous airflow by changing the Weber number and effective Ohnesorge number. In addition, a detailed study is conducted on the liquid ring with the highest liquid content. The results show that at low Weber numbers, the number of nodes generated at the XG droplet ring is the same as that of the water droplet, following “the combined R-T/aerodynamic drag” mechanism. However, the final diameter of the nodes differs significantly from that of the water droplet. The particle size of XG liquid ring nodes is not only affected by the Weber number but also decreases with the increase of the effective Ohnesorge number. The particle size of the remaining broken sub-droplets in the liquid ring decreases with the increase of the effective Ohnesorge number. Finally, the spatial range of droplet breakup under different parameters is described by using the liquid ring breakup angle, and it is found that the breakup angle of the liquid ring is mainly related to the breakup mode.</div></div>","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":"182 ","pages":"Article 105039"},"PeriodicalIF":3.6,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

CFD unified approach under Eulerian–Lagrangian framework for methanol and gasoline direct injection sprays in evaporative and flash boiling conditions 蒸发和闪沸条件下甲醇和汽油直喷喷雾的欧拉-拉格朗日框架下的 CFD 统一方法

IF 3.6 2区工程技术

International Journal of Multiphase Flow Pub Date : 2024-11-04 DOI: 10.1016/j.ijmultiphaseflow.2024.105048

Francesco Duronio , Hao-Pin Lien , Angelo De Vita

{"title":"CFD unified approach under Eulerian–Lagrangian framework for methanol and gasoline direct injection sprays in evaporative and flash boiling conditions","authors":"Francesco Duronio , Hao-Pin Lien , Angelo De Vita","doi":"10.1016/j.ijmultiphaseflow.2024.105048","DOIUrl":"10.1016/j.ijmultiphaseflow.2024.105048","url":null,"abstract":"<div><div>Innovative synthetic fuels for advanced propulsion systems, such as methanol and ammonia, and synthetic blended fuels (E00, E10, and E30), known for their high volatility, are often injected directly into combustion chambers. It follows that Eulerian–Lagrangian spray models need to accurately capture the spray collapse as a consequence of flash boiling onset and be capable of proficiently handling the preferential evaporation of multi-component fuels in evaporative scenarios.</div><div>So, we performed the assessment of an Eulerian–Lagrangian CFD code for simulating methanol and E00 gasoline blend sprays in both early and late injection conditions involving flash boiling conditions and preferential evaporation. The adoption of an effervescent breakup model and of a non-equilibrium phase transition model for the discrete phase allows the adoption of a setup that is almost completely free from specific constant tuning, especially for what concerns the breakup model. We validated the simulations using experimental PLV maps of methanol and E00 sprays issued from the ECN Spray M injector. The results highlight a significantly different morphology of the methanol spray compared to the E00 one under late injection conditions. Under stratified combustion, low-volatile fuels are likely to be ignited first, and the flame propagates toward the high-volatile fuels. The spray collapse was also correctly reproduced, inducing the presence of a low-pressure zone and modifying the spray morphology.</div></div>","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":"182 ","pages":"Article 105048"},"PeriodicalIF":3.6,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thin liquid film stability in the presence of bottom topography and surfactant 底部地形和表面活性剂作用下的薄液膜稳定性

IF 3.6 2区工程技术

International Journal of Multiphase Flow Pub Date : 2024-11-02 DOI: 10.1016/j.ijmultiphaseflow.2024.105043

Eugene Zivkov, Jean-Paul Pascal

引用次数: 0

Void drift in narrow rectangular channels for highly advective bubbly flows: A macroscopic drift-flux model derived from two-fluid local simulations 高平流气泡流在窄矩形水道中的空隙漂移：从双流体局部模拟中得出的宏观漂移-流动模型

IF 3.6 2区工程技术

International Journal of Multiphase Flow Pub Date : 2024-10-28 DOI: 10.1016/j.ijmultiphaseflow.2024.105038

G. Bois, R. Barbera, M. Amate-Vignon

{"title":"Void drift in narrow rectangular channels for highly advective bubbly flows: A macroscopic drift-flux model derived from two-fluid local simulations","authors":"G. Bois, R. Barbera, M. Amate-Vignon","doi":"10.1016/j.ijmultiphaseflow.2024.105038","DOIUrl":"10.1016/j.ijmultiphaseflow.2024.105038","url":null,"abstract":"<div><div>This article addresses the issue of reduced models to describe turbulent two-phase flows in industrial applications. This work is an application based on Bois (2021) theoretical derivations to connect the spatially-averaged drift-flux model (DFM) to the local Reynolds-averaged two-fluid model (TFM). It presents new opportunities to calibrate closure laws or propose new models based on finer-scale descriptions. Highly convective steady bubbly flows with wall-peaking void fraction profiles are considered. Dispersed bubbles are weakly deformable. A new model dedicated to void fraction dispersion in flat rectangular channels is developed for application into the DFM. The model is calibrated based on reference local Euler–Euler two-fluid simulations of pressurised water and steam mono-dispersed bubbles, in adiabatic conditions. 64 conditions are considered to cover regularly the 3D parameter space in void fraction, Reynolds and Eötvös numbers. The new formulation proposed shows a very good fit with the post-processed predictions of local CFD simulations along with a substantial reduction in grid requirement. The model contains sub-filter correlations between vapour concentration and mixture or relative velocities. This model derived from local simulations is validated <em>a posteriori</em> in an industrial component scale code where the full space-filtered DFM is implemented and resolved. This work proves the benefits and feasibility of one-by-one model development and calibration based on two-fluid simulations.</div></div>","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":"182 ","pages":"Article 105038"},"PeriodicalIF":3.6,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

3D numerical investigation of bubble upflow condensation behaviors during subcooled flow boiling in mini-channel with VOSET 利用 VOSET 对微型通道中过冷流沸腾时的气泡上升流冷凝行为进行三维数值研究

IF 3.6 2区工程技术

International Journal of Multiphase Flow Pub Date : 2024-10-28 DOI: 10.1016/j.ijmultiphaseflow.2024.105040

Shuqi Jin , Yujie Chen , Kong Ling , Weidong Xu , Wen-Quan Tao

{"title":"3D numerical investigation of bubble upflow condensation behaviors during subcooled flow boiling in mini-channel with VOSET","authors":"Shuqi Jin , Yujie Chen , Kong Ling , Weidong Xu , Wen-Quan Tao","doi":"10.1016/j.ijmultiphaseflow.2024.105040","DOIUrl":"10.1016/j.ijmultiphaseflow.2024.105040","url":null,"abstract":"<div><div>In the subcooled flow boiling process, bubble condensation is an inevitable basic phenomenon. This paper studies the condensation phenomenon of the single, double vertical/horizontal saturated bubbles rising in a three-dimensional mini-rectangular channel based on the interface capture method VOSET (coupled volume-of-fluid and level set method) and the phase transition model. Bubble condensation behaviors are investigated at different initial diameters, inlet velocity distributions, subcooling temperatures, bubble gaps, and arrangement for the two-bubble condensing system especially. The effects of these parametric on bubble motion trajectory, shape evolution, volume variation, and condensation rate are presented. The numerical results indicated that the initial bubble size and liquid subcooling play an important role in influencing the shape and volume variation of condensing bubble behaviors significantly, while the inlet velocity distribution only affects bubble motion trajectory. Furthermore, the interaction and coalescence between the bubbles will affect the bubble behaviors and the condensation rate. Finally, the condensation heat transfer coefficients at the bubble surfaces for different cases simulated in this paper are presented, seemingly first in the literature.</div></div>","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":"182 ","pages":"Article 105040"},"PeriodicalIF":3.6,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical simulation of angled-injected liquid jet breakup in supersonic crossflow by a hybrid VOF-LPT method 用VOF-LPT混合方法模拟超声速横流中角度注入液体射流破裂

IF 3.8 2区工程技术

International Journal of Multiphase Flow Pub Date : 2023-09-01 DOI: 10.1016/j.ijmultiphaseflow.2023.104503

Wenyuan Zhou , Bing Chen , Qingbo Zhu , Sihang Rao , Xu Xu

{"title":"Numerical simulation of angled-injected liquid jet breakup in supersonic crossflow by a hybrid VOF-LPT method","authors":"Wenyuan Zhou , Bing Chen , Qingbo Zhu , Sihang Rao , Xu Xu","doi":"10.1016/j.ijmultiphaseflow.2023.104503","DOIUrl":"https://doi.org/10.1016/j.ijmultiphaseflow.2023.104503","url":null,"abstract":"<div><p>The breakup of angled-injected liquid jets in supersonic airflow is investigated numerically by a hybrid Volume of Fluid and Lagrangian Particle Tracking (VOF-LPT) method. A Multi-criterion adaptive mesh refinement (AMR) procedure and dynamic load balancing (DLB) algorithm are applied to improve the accuracy of interface and shock wave characteristics and reduce the use of computational resources and liquid mass loss. The flow characteristics of the spray field and penetration depth of the angled-injected liquid jet from the simulations agreed well with the experimental results. Under the supersonic crossflow conditions, the jet has momentum in the counter-flow direction that improves gas-liquid interactions. The penetration depth of the liquid jet increase with the increase of the injection angle. In particular, the penetration depth of the angled-injected liquid jet is given in the: <span><math><mrow><mi>y</mi><mo>/</mo><mi>d</mi><mo>=</mo><mn>0.12</mn><mo>·</mo><mi>sin</mi><mrow><mo>(</mo><mrow><mn>2</mn><mi>θ</mi><mo>/</mo><mn>3</mn></mrow><mo>)</mo></mrow><mo>·</mo><msup><mrow><mo>(</mo><msup><mrow><mi>e</mi></mrow><mrow><mi>sin</mi><mo>(</mo><mrow><mn>2</mn><mi>θ</mi><mo>/</mo><mn>3</mn></mrow><mo>)</mo></mrow></msup><mo>)</mo></mrow><mrow><mn>3.185</mn></mrow></msup><mo>·</mo><msup><mrow><mi>q</mi></mrow><mrow><mn>0.389</mn></mrow></msup><msup><mrow><mo>(</mo><mrow><mi>x</mi><mo>/</mo><mi>d</mi></mrow><mo>)</mo></mrow><mrow><mn>0.309</mn></mrow></msup></mrow></math></span>. Moreover, the liquid jet at a larger injection angle has a larger spray spread angle and wider wake region due to the larger windward area. Furthermore, the total pressure loss of airflow increases with the injection angle increasing. Considering the total pressure loss for all injection conditions is lower than 14%, the total pressure loss caused by the injection angle increase can be negligible.</p></div>","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":"166 ","pages":"Article 104503"},"PeriodicalIF":3.8,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"1890073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1