International Journal of Multiphase Flow最新文献

{"title":"Comprehensive spray characterization of air-assisted impinging jet atomizer for carbon capture applications","authors":"Vignesh Kumar Dhinasekaran ,&nbsp;Ondrej Cejpek ,&nbsp;Milan Maly ,&nbsp;Jan Jedelsky ,&nbsp;Madan Mohan Avulapati","doi":"10.1016/j.ijmultiphaseflow.2025.105123","DOIUrl":"10.1016/j.ijmultiphaseflow.2025.105123","url":null,"abstract":"<div><div>Spray scrubbing for carbon dioxide (CO₂) absorption has attracted research interest because it is a viable retrofitting option for existing power plants. For effective absorption, desired spray characteristics must be attained for a wide range of absorbent liquids with distinct physical properties. In this study, an air‑assisted impinging jet atomizer was evaluated to determine its suitability for CO₂ absorption using monoethanolamine (MEA). The study focused on understanding the influence of various physical parameters on the overall atomization process. Spray experiments were performed under quiescent atmospheric conditions at different liquid flow rates and air-to-liquid mass flow rate ratios (<em>ALR</em>). High-speed imaging and laser diffraction techniques were used for spray visualization and droplet size characterization, respectively. The study revealed that the primary atomization was either a hydrodynamic mode of breakup caused by hydrodynamic instabilities in a liquid sheet or an aerodynamic mode of breakup, where the breakup was dominated by gas-liquid interaction. A transition between these breakup processes occurred at an air-to-liquid momentum ratio of ∼0.6, and a gas Weber number of ∼30. Improved atomization was obtained in the aerodynamic mode of the breakup. A Sauter mean diameter (<em>SMD</em>) of the order of 60 µm, along with a narrow size distribution, was obtained at high liquid flow rates, even at an <em>ALR</em> of 4 %. Furthermore, empirical correlations were proposed for <em>SMD</em> and spray angle as functions of gas Weber number, liquid Weber number, and Ohnesorge number. The detailed spray characterization performed in this study provides valuable insights into the atomization process of an air-assisted impinging jet atomizer and is crucial for testing this atomizer configuration in a spray column for CO₂ capture.</div></div>","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":"184 ","pages":"Article 105123"},"PeriodicalIF":3.6,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143138001","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}

{"title":"Rayleigh wave induced cavitation bubble structures","authors":"Hendrik Reese ,&nbsp;Ulisses J. Gutiérrez-Hernández ,&nbsp;Patricia Pfeiffer ,&nbsp;Pedro A. Quinto-Su ,&nbsp;Claus-Dieter Ohl","doi":"10.1016/j.ijmultiphaseflow.2024.105114","DOIUrl":"10.1016/j.ijmultiphaseflow.2024.105114","url":null,"abstract":"<div><div>A localized energy deposition in a thin layer of liquid between two solid glass plates excites waves in the liquid, solids, and their interfaces. Of particular interest is an elastic surface wave (Rayleigh wave) on the liquid–solid interface that travels faster than the shock wave in the liquid. The surface deformation caused by the Rayleigh wave expands the layer of liquid, thereby locally reducing the pressure below the cavitation threshold. The created tension nucleates many cavitation bubbles, which later collapse due to the passage of the trailing shock wave in the liquid. Interestingly, the bubbles are not arranged homogeneously but on concentric rings centered on the location of the energy deposition. We explain the formation of the concentric rings with the interaction between neighboring bubbles. The fluid–structure interaction is modeled with a coupled finite volume solver that couples a multi-phase compressible fluid region (water and bubble gas) with an elastic solid (glass). We find that the nucleation of bubbles in such a geometry relaxes the tension in their immediate vicinity and thereby suppresses the growth of neighboring bubble nuclei. This idea is confirmed by a Rayleigh–Plesset model of a bubble driven by a far-field pressure obtained from the finite volume simulation. The observed ring patterns are thus the result of the successive activation of statistically distributed nucleation sites into explosively expanding cavitation bubbles in an axisymmetric geometry, whose strong interaction on short distances leads to a hindrance of bubble growth in radially distinct regions.</div></div>","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":"184 ","pages":"Article 105114"},"PeriodicalIF":3.6,"publicationDate":"2024-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143138002","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}

{"title":"Corrigendum to “Microstructure-based prediction of hydrodynamic forces in stationary particle assemblies”, International Journal of Multiphase Flow 175 (2024) 104815","authors":"Berend van Wachem,&nbsp;Hani Elmestikawy,&nbsp;Victor Chéron","doi":"10.1016/j.ijmultiphaseflow.2024.105101","DOIUrl":"10.1016/j.ijmultiphaseflow.2024.105101","url":null,"abstract":"","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":"184 ","pages":"Article 105101"},"PeriodicalIF":3.6,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143137943","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}

{"title":"Particle resuspension from complex multilayer deposits by laminar flows: Statistical analysis and modeling","authors":"Hao Liu ,&nbsp;Mireille Bossy ,&nbsp;Bernhard Vowinckel ,&nbsp;Christophe Henry","doi":"10.1016/j.ijmultiphaseflow.2024.105115","DOIUrl":"10.1016/j.ijmultiphaseflow.2024.105115","url":null,"abstract":"<div><div>Particle resuspension refers to the physical process by which solid particles deposited on a surface are, first, detached and, then, entrained away by the action of a fluid flow. In this study, we explore the dynamics of large and heavy spherical particles forming a complex sediment bed which is exposed to a laminar shear flow. For that purpose, we rely on fine-scale simulations based on a fully-resolved flow field around individual particles whose motion is explicitly tracked. Using statistical tools, we characterize several features: (a) the overall bed dynamics (e.g. the average particle velocity as a function of the elevation), (b) the evolution of the top surface of the sediment bed (e.g. distribution of the surface elevation or of the surface slope) and (c) the dynamics of individual particles as they detach from or re-attach to the sediment bed (including the frequency of these events, and the velocity difference/surface angle for each event). These results show that particles detach more frequently around the peaks in the top surface of the sediment bed and that, once detached, they undergo short hops as particles quickly sediment towards the sediment bed. A simple model based on the surface characteristics (including its slope and elevation) is proposed to reproduce the detachment ratio.</div></div>","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":"184 ","pages":"Article 105115"},"PeriodicalIF":3.6,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143137940","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}

{"title":"A unified spray model for large eddy simulations under non-flashing and flash boiling conditions: Effects of in-nozzle flow and external thermal breakup in liquid ammonia injection","authors":"Zhuoying Jin ,&nbsp;Haoqing Wu ,&nbsp;Shijie Xu ,&nbsp;Dezhi Zhou ,&nbsp;Shijie Mi ,&nbsp;Yong Qian ,&nbsp;Xingcai Lu","doi":"10.1016/j.ijmultiphaseflow.2024.105116","DOIUrl":"10.1016/j.ijmultiphaseflow.2024.105116","url":null,"abstract":"<div><div>As a carbon-free fuel, liquid ammonia is promising to be applied in gas turbines and marine engines to facilitate the decarbonization of energy and transportation sectors. However, ammonia has a high saturation pressure which leads to the transition from non-flashing to flash boiling atomization mechanisms and introduces challenges in modeling the liquid ammonia spray. It is essential to study the spray behavior and propose a unified spray model with high accuracy and implementation efficiency under wide operation conditions. In this study, a numerical model is developed under the Lagrangian-Eulerian framework to consider various breakup mechanisms. This model is then adopted for the spray simulations of liquid ammonia and validated against measurements. Firstly, the spray patterns are classified as normal evaporation (Rp ≥ 1.0), external flash boiling (1.0 &lt; Rp ≤ 0.3), transitional and fully flash boiling (Rp &lt; 0.3) through atomization mechanism analysis. Aiming at various spray patterns, a numerical model is developed involving the in-nozzle flow effect, external thermal breakup, and secondary aerodynamic breakup. The model comparison and validation results under different conditions show the proper prediction ability of the present model with accurate spray penetration and morphology. Compared with the typical aerodynamic breakup model, the spray expansion through the radial velocity increment of child droplets is well reproduced in the present model by considering the external thermal breakup. In addition, the improved boundary conditions that account for the in-nozzle flow effects enable a better prediction under the transitional and fully flash boiling region. Then the spray characteristics analysis of liquid ammonia under various conditions is conducted. It is found that the flash boiling plays an important role in primary atomization and generates smaller droplets. The initial spray expansion due to in-nozzle flow, later low air resistance, and continuous acceleration of small droplets leads to relatively slow and then fast penetration of flash boiling spray. Furthermore, a more complete spray mixing and evaporation process in both axial and radial directions is observed under the Rp0.1 condition. Nevertheless, the cooling effects resulted from the high latent heat of ammonia and subsequent wetting problem for combustion chamber wall should also be considered in practical applications. This study fills the gaps between measurements and predictions of the liquid ammonia spray under the transition from non-flashing to flash boiling conditions.</div></div>","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":"184 ","pages":"Article 105116"},"PeriodicalIF":3.6,"publicationDate":"2024-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143138003","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}

{"title":"Drop impact onto a moving substrate: Aerodynamic rebound","authors":"Bastian Stumpf ,&nbsp;Samaneh Abdi Qezeljeh ,&nbsp;Reda Kamal ,&nbsp;Fabien Dezitter ,&nbsp;Alessandro Martuffo ,&nbsp;Ilia V. Roisman ,&nbsp;Jeanette Hussong","doi":"10.1016/j.ijmultiphaseflow.2024.105113","DOIUrl":"10.1016/j.ijmultiphaseflow.2024.105113","url":null,"abstract":"<div><div>The dynamics of droplets approaching fast moving surfaces of high surface-tangential velocities is relevant to numerous technical applications, such as icing phenomena in aviation. Due to the substrate motion a boundary layer is formed which interacts with impacting droplets. In the present study, the transition from drop impact and splashing to boundary layer induced drop rebound is investigated for varying drop diameters, drop and plate velocity, as well as impact angles. It is found that this transition is strongly influenced by the degree of drop deformation that is induced by aerodynamic forces acting on the drop when it enters the boundary layer. Based on these considerations, a threshold model is obtained that describes the transition from splash to aerodynamic rebound. It is shown that the model is valid for a laminar and a turbulent boundary layer agreeing well with own and existing experimental data.</div></div>","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":"184 ","pages":"Article 105113"},"PeriodicalIF":3.6,"publicationDate":"2024-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143137942","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}

{"title":"Correlations for aerodynamic force coefficients of non-spherical particles in compressible flows","authors":"Christian Gorges ,&nbsp;Victor Chéron ,&nbsp;Anjali Chopra ,&nbsp;Fabian Denner ,&nbsp;Berend van Wachem","doi":"10.1016/j.ijmultiphaseflow.2024.105111","DOIUrl":"10.1016/j.ijmultiphaseflow.2024.105111","url":null,"abstract":"<div><div>This study presents particle-resolved direct numerical simulations using three-dimensional body-fitted hexahedral meshes to investigate the aerodynamic force and torque coefficients of non-spherical particles in compressible flows. The simulations focus on three particle shapes: a prolate spheroid, an oblate spheroid, and a rod-like particle, across a range of Mach numbers (0.3 to 2.0), angles of attack (0°to 90°), and particle Reynolds numbers (100 to 300). Results show that the particle shape significantly impacts the aerodynamic forces on a particle in a compressible flow, with oblate spheroids exhibiting the highest drag, lift, and torque values. Correlations for these aerodynamic coefficients of the particles in a compressible flow are developed and validated. These correlations advance multiphase flow modelling by improving the accuracy of point-particle simulations for non-spherical particles in compressible flows.</div></div>","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":"184 ","pages":"Article 105111"},"PeriodicalIF":3.6,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143138004","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}

{"title":"Oscillatory two-phase flow dynamics in capillary tubes under microgravity conditions: Numerical modeling and qualitative analysis of the flow structures","authors":"Tomasz Duraziński ,&nbsp;Andrzej Ireneusz Nowak ,&nbsp;Jun Ishimoto ,&nbsp;Sławomir Pietrowicz","doi":"10.1016/j.ijmultiphaseflow.2024.105107","DOIUrl":"10.1016/j.ijmultiphaseflow.2024.105107","url":null,"abstract":"<div><div>This work examines the oscillatory motion of gas–liquid structures in <span><math><mi>P</mi></math></span>ulsating <span><math><mi>H</mi></math></span>eat <span><math><mi>P</mi></math></span>ipes (PHP), which is critical for designing passive cooling systems for microgravity applications. Accurately capturing gas–liquid volume fraction behavior is crucial for understanding the mechanisms driving the break-up and coalescence of the gas plugs. Experimental data obtained from the ZARM drop tower facility in Bremen, Germany, were used to validate numerical simulations conducted with OpenFOAM v2106, employing the <span><math><mi>V</mi></math></span>olume <span><math><mi>O</mi></math></span>f <span><math><mi>F</mi></math></span>luid (VOF) method. In experiments, ethanol was utilized as the working under two distinct initial vapor bubble configurations. A boundary condition enforcing the oscillatory behavior of the velocity vector was implemented in the simulations. The results demonstrate high of accuracy in reproducing the observed flow structures, providing a qualitative comparison between the algebraic VOF method and experimental observations. The simulations successfully captured the oscillatory dynamics of two-phase structures, offering valuable insights into vapor bubble behavior in microgravity. While heat transfer was not included in the present analysis, these findings are a foundation for future studies integrating thermal-flow processes. This preliminary analysis advances the understanding of PHP behavior in microgravity and highlights pathways for more comprehensive modeling efforts.</div></div>","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":"184 ","pages":"Article 105107"},"PeriodicalIF":3.6,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143137937","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}

{"title":"Scale effects of the tip-leakage flow with and without cavitation: A numerical study in OpenFOAM","authors":"Xiaotao Zhao ,&nbsp;Huaiyu Cheng ,&nbsp;Bin Ji ,&nbsp;Rickard E. Bensow","doi":"10.1016/j.ijmultiphaseflow.2024.105108","DOIUrl":"10.1016/j.ijmultiphaseflow.2024.105108","url":null,"abstract":"<div><div>Large eddy simulations of the tip-leakage vortex (TLV) flow around the NACA0009 hydrofoil are performed in OpenFOAM to study the scale effects of the tip-leakage vortex profile with and without cavitation. An incompressible single-phase solver and an in-house advanced compressible cavitating flow solver are employed to reproduce the evolution of the TLV and tip-leakage vortex cavitation (TLVC), respectively. By changing the incoming velocity and the hydrofoil size, six cases are divided into three different flow conditions: velocity scale, size scale and Reynolds number similarity. Comparing the predicted results with the experimental data from literature, a satisfying agreement is obtained. Some crucial flow characteristics, e.g. vortex structures, vortex intensity, vortex trajectory and wandering, velocity distribution, fluctuation features, and TLVC evolution, are studied in detail and the scale effects of them are significant. With the increasing incoming velocity or scale ratio, more pronounced vortex fusion occurs and makes the TLV maintain a higher intensity downstream. The greater the incoming velocity or scale ratio, the more the TLV is pulled away from the hydrofoil and the weaker the amplitude of TLV wandering. Moreover, the transition of axial flow profile from jet-like to wake-like is delayed by increasing the incoming velocity/scale ratio. An increase in incoming velocity or scale ratio leads to an increase in circulation and a decrease in the radius of TLV core, facilitating the occurrence of TLVC. With equal Reynolds number and cavitation number, the scale effects of tip-leakage flows can be neglected.</div></div>","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":"184 ","pages":"Article 105108"},"PeriodicalIF":3.6,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143138007","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}

{"title":"Role of the process conditions on three-dimensional viscous fingering: Impact on enhanced oil recovery and geological storage","authors":"Pooja Singh,&nbsp;Sourav Mondal","doi":"10.1016/j.ijmultiphaseflow.2024.105110","DOIUrl":"10.1016/j.ijmultiphaseflow.2024.105110","url":null,"abstract":"<div><div>The problem of viscous fingering is a scientific challenge in oil recovery and geological storage. The phenomena of viscous fingering in a three dimensional setting is widely different from the 2D analogue. Here, we study the three-dimensional viscous fingering morphology to investigate the effect of fluid miscibility and porous medium permeability. High resolution industrial grade X-ray micro-computer-tomography scanning is used to explore the 3D instability patterns. The phase miscibility of the injection fluid to the displaced fluid affects the fingering phenomena, transitioning from dispersion limited to diffusion. The areal sweep efficiency is higher for miscible case and is invariant with flow rates. We have used the fractal analysis to analyse the complex patterns, and the fractal dimension is related to the process conditions. We report 3D diffusion-limited aggregation simulations to obtain patterns similar to the miscible fingering patterns and provide insights on the pattern growth behaviour.</div></div>","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":"184 ","pages":"Article 105110"},"PeriodicalIF":3.6,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143138008","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}