International Journal of Multiphase Flow最新文献

{"title":"Proper orthogonal decomposition analysis of turbulent natural convection in an air–water system with evaporation across the free surface","authors":"Julien Carlier ,&nbsp;Bérengère Podvin ,&nbsp;Miltiadis V. Papalexandris","doi":"10.1016/j.ijmultiphaseflow.2025.105273","DOIUrl":"10.1016/j.ijmultiphaseflow.2025.105273","url":null,"abstract":"<div><div>In this paper, we analyze the properties of turbulent natural convection in a water-air system via Proper Orthogonal Decomposition (POD). The flow domain is an open-top cuboid uniformly heated from below, while the water and air are separated by an evaporative interface. Direct numerical simulations of this problem were presented in an earlier publication of ours; herein we investigate in detail the emerging flow structures and the interaction between the two phases. In the water, the flow is organized around a dominant convective roll. In the gas the flow is due to combined thermal-concentration convection. The flow pattern is more complex and consists of an outer circulation plus an inner dual-roll structure with one roll above the other. First we discuss spectra of the thermal fluctuations. In the gas, the spectrum is bimodal. The high-frequency peak is due to natural convection while the low-frequency one is due to the interaction with water at the free surface. Then, we present the results of our POD analysis and elaborate on the properties of the dominant spatial and temporal modes. The spectra of the temporal modes are also examined herein. Our analysis shows that there is high correlation and coherence between the low-frequency signals in the dominant modes of the two phases, which implies that the convective patterns in the two phases influence each other. We also present the reconstructed snapshots with the dominant POD modes and discuss their influence. Our analysis shows that they provide a fairly accurate approximation of the instantaneous flow patterns. Further, in the water, the dominant mode modifies the length of the main convective roll, whereas the second mode tends to rotate its impingement point.</div></div>","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":"190 ","pages":"Article 105273"},"PeriodicalIF":3.6,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143942814","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":"New experimental insights into two-phase air–water bubbly and intermittent flow in large duct and cross-flow configurations","authors":"Antonio Chahine ,&nbsp;Daniele Vivaldi ,&nbsp;Guillaume Brillant","doi":"10.1016/j.ijmultiphaseflow.2025.105266","DOIUrl":"10.1016/j.ijmultiphaseflow.2025.105266","url":null,"abstract":"<div><div>This study focuses on the characterization of two-phase air–water cross-flow in a tube bundle with square pitch configuration, and of the upward flow in the free duct region upstream of the bundle. Two measurement techniques were used: a wire mesh sensor and a dual optical probe. The research focuses on analyzing void fraction, gas velocity, gas–liquid interface/bubble shape and size, and two-phase flow regime transitions. Bubbly flow and intermittent flow regimes were investigated, by varying the gas flow rate for a fixed liquid flow rate. The intermittent flow showed a periodic generation of large gas structures in the central region of section. The frequency of these structures was obtained and found not to vary significantly between the free duct region downstream of the tube bundle, the region within the tube bundle and the region downstream of the bundle. Gas velocities could be measured as a function of the size of the gas structures. The profiles of void fraction and gas velocity at different positions within the tube bundle were measured and analyzed.</div></div>","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":"190 ","pages":"Article 105266"},"PeriodicalIF":3.6,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143924565","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":"Two-phase flow mechanisms in cylindrical heterogeneous-wet capillaries","authors":"Yihang Xiao ,&nbsp;Yongming He ,&nbsp;Zhenjiang You ,&nbsp;Jun Zheng ,&nbsp;Lu Wang ,&nbsp;Lei Wang","doi":"10.1016/j.ijmultiphaseflow.2025.105274","DOIUrl":"10.1016/j.ijmultiphaseflow.2025.105274","url":null,"abstract":"<div><div>Pore-scale displacement mechanisms govern the flow patterns in heterogeneous-wet porous media. Existing theoretical models built on the polygonal capillaries fail to capture fluid transport across the entire range of wettability parameters due to the limitations in fluid and wettability distributions, posing challenges for accurate prediction of macroscale flow processes. To address this knowledge gap, a novel model of two-phase flow for cylindrical capillaries featuring heterogeneous-wet state is proposed based on the Mayer-Stowe-Princen theory, taking into account the geometric evolution of displacement interfaces. According to the present model, the piston-like displacements driven by main terminal meniscus with dual curvatures, stepwise and mixed displacements controlled alternately by the main terminal and arc menisci are identified. Sensitivity analyses show that a diminished difference in contact angle facilitates the occurrence of piston-like flow, and reduces the influence of oil-wet proportion on capillary entry pressure. Moreover, stepwise displacements are primarily governed by the main terminal meniscus with a single curvature structure, whereas the upward sweep range of arc meniscus is wider during mixed flow involving both drainage and imbibition mechanisms. For stepwise displacement, as oil-wet proportion increases, the sweep range of the main terminal meniscus in oil-wet region expands, and that of the arc meniscus first increases and then decreases, reaching a maximum at an oil-wet proportion of 50 %. Furthermore, nonlinear flow occurs when arc meniscus is close to the capillary surfaces with strong wettability. Compared with the stepwise displacement, the piston-like flow exhibits stronger drainage resistance and imbibition dynamics due to the combined impacts of two wettabilities on the main terminal meniscus. This theoretical model effectively simulates two-phase flow across the full range of wettability parameters, laying the foundation for precise prediction of macroscale flow patterns.</div></div>","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":"190 ","pages":"Article 105274"},"PeriodicalIF":3.6,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143907638","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":"Bubbles and bubbly flows","authors":"Valeria Garbin ,&nbsp;Dieter Bothe ,&nbsp;Günter Brenn ,&nbsp;Carlo Massimo Casciola ,&nbsp;Catherine Colin ,&nbsp;Marco Marengo ,&nbsp;Frédéric Risso ,&nbsp;Gretar Tryggvason ,&nbsp;Detlef Lohse","doi":"10.1016/j.ijmultiphaseflow.2025.105240","DOIUrl":"10.1016/j.ijmultiphaseflow.2025.105240","url":null,"abstract":"<div><div>Bubbles and bubbly flows are omnipresent in nature and technology, showing a multitude of phenomena, which can be either beneficial or a hindrance. In any case, for their control and their applications, it is crucial to understand their fundamentals and therefore from the very beginning of the International Journal of Multiphase Flow they have been central. In this synoptic review we give some examples for the fascinating fluid dynamics of bubbles and bubbly flows, starting from their nucleation and cavitation phenomena, then going to single bubble phenomena, and finally to bubbly flows, in which the collective effects of bubbles are key, and to mass transfer in such bubbly flows. The review ends with an outlook on future direction and open issues in the research on bubbles and bubbly flows.</div></div>","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":"190 ","pages":"Article 105240"},"PeriodicalIF":3.6,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143947315","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":"Large eddy simulation of particle deposition in fully developed turbulent fin-tube heat exchanger","authors":"Kousseila Atsaid,&nbsp;Rémi Gautier,&nbsp;Souria Hamidouche,&nbsp;Serge Russeil","doi":"10.1016/j.ijmultiphaseflow.2025.105271","DOIUrl":"10.1016/j.ijmultiphaseflow.2025.105271","url":null,"abstract":"<div><div>Large Eddy Simulations are performed to investigate particle deposition within a fin-tube heat exchanger operating in fouling conditions for waste heat recovery. The particle equation of motion is solved using Lagrangian Particle Tracking method taking into account both drag and lift forces. The particle diameters considered range from 1 to 24 µm, corresponding to dimensionless particle relaxation times (<span><math><msubsup><mrow><mi>τ</mi></mrow><mrow><mrow><mi>p</mi></mrow></mrow><mo>+</mo></msubsup></math></span>) between 0,18 and 106,24. A Critical Deposition Velocity Model (CDVM) is integrated to simulate the fouling in the fin-tube geometry and is compared to the conventional Trap Wall Model (TWM) where the particle deposits when it hits the wall. In the framework of particle-laden regular channel flows, both models lead to a good agreement on the evolution of <span><math><msubsup><mi>V</mi><mrow><mi>d</mi></mrow><mo>+</mo></msubsup></math></span> as function of the dimensionless particle relaxation time (<span><math><msubsup><mrow><mi>τ</mi></mrow><mrow><mrow><mi>p</mi></mrow></mrow><mo>+</mo></msubsup></math></span>). For the fin-tube geometry, it is found that the effect of gravity is negligible on the deposition velocity whereas the deposition model has a considerable influence on particle deposition and dispersion. Results show that particles size and turbulence fluctuations are the driving parameters of particle dispersion and deposition trends. Moreover, analysis of means of local distribution of particle dispersion and local deposition on fin-tube walls depict four newly identified fouling regimes as a function of the dimensionless particle relaxation time (τp+).</div></div>","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":"190 ","pages":"Article 105271"},"PeriodicalIF":3.6,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143907637","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":"Arbitrary Lagrangian-Eulerian formulation with Skeleton-based Structural Models (ALE-SSM) framework for water-structure interaction with large structural deformations","authors":"Dimitrios Kalliontzis","doi":"10.1016/j.ijmultiphaseflow.2025.105269","DOIUrl":"10.1016/j.ijmultiphaseflow.2025.105269","url":null,"abstract":"<div><div>This paper presents a method for water-structure, two-phase, interaction computations with geometrically nonlinear structural deformations. The method builds on the Arbitrary Lagrangian-Eulerian Formulation with Skeleton-Based Structural Models (ALE-SSM) framework to model the structural domain with force-based line elements (FBEs). The air-to-water flow is simulated with a coupled level-set/volume-of-fluid (CLS-VOF) approach with fluid mass correction applied in both the LS and VOF domains. Using FBEs, numerical tests show that the method effectively simulates physical experiments involving low- and high-compliant, flexible, cantilever structures subjected to multi-phase flows. The proposed method is used to evaluate the sensitivity of two-phase mass balancing to structural compliance and perform a parametric study to investigate compliance effects on water-structure interaction and hydrodynamic loads.</div></div>","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":"189 ","pages":"Article 105269"},"PeriodicalIF":3.6,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143899641","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":"Effect of cavitation structures and flow rates on pressure pulsation in the inducer: An experimental investigation","authors":"Hui Zhang ,&nbsp;Desheng Zhang ,&nbsp;Guangjian Zhang ,&nbsp;Xiaoyan Ye ,&nbsp;Puyu Cao","doi":"10.1016/j.ijmultiphaseflow.2025.105272","DOIUrl":"10.1016/j.ijmultiphaseflow.2025.105272","url":null,"abstract":"<div><div>The generation of noise and structural vibrations in inducers caused by unsteady cavitation represents a critical technical challenge, necessitating comprehensive investigation into the dynamic characteristics of cavitation-induced pressure pulsations. The method of wavelet decomposition and spectral proper orthogonal decomposition (SPOD) were employed to analyze the connection between instantaneous pressure pulsations and the cavitation structures. The results indicate that hub cavitation and back-flow vortex cavitation occur at 0.6-0.8 <em>ϕ</em>_d, where <em>ϕ</em>_d is defined as the flowrate coefficient for which the inducer has been designed. Perpendicular vortex cavitation focuses on 0.8-1.0 <em>ϕ</em>_d and interacts with the sheet cavitation on the adjacent suction surface. Eddy-cavitation appears at 1.0-1.2 <em>ϕ</em>_d. However, the tip leakage vortex cavitation area shrinks from a small flow rate to a large one. Cavitation growth primarily induces low-frequency pressure pulsations about 147.5 Hz; cavitation shedding and collapsing at 0.6-0.9 <em>ϕ</em>_d induces high-frequency pressure pulsations above 636 Hz, whereas 1.0-1.2 <em>ϕ</em>_d induces low-frequency pressure pulsations below 322 Hz. SPOD analysis of inducer cavitation structures demonstrated decreasing modal spatial sizes with elevated decomposition frequencies and mode orders at constant flow rates, while increased flow rates reduced modal spatial dimensions with constant spectral parameters. The cavitation development process induced a pressure coefficient that increased from valley-to-peak. However, the shedding cavitation migration process generated peak-to-valley pressure transitions.</div></div>","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":"190 ","pages":"Article 105272"},"PeriodicalIF":3.6,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143924564","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":"Impact of the interface heat defect on the thermocapillary response of the phase boundary in a liquid–gas system upon local heating from below","authors":"Victoria B. Bekezhanova ,&nbsp;Olga N. Goncharova","doi":"10.1016/j.ijmultiphaseflow.2025.105260","DOIUrl":"10.1016/j.ijmultiphaseflow.2025.105260","url":null,"abstract":"<div><div>The problem of thermocapillary convection induced by local boundary heating in a closed cell filled with a volatile liquid and an overlying gas–vapor mixture is studied. The mathematical model is based on the Boussinesq approximation of the nonstationary Navier<!--> <!-->–<!--> <!-->Stokes equations for a viscous incompressible fluid. It includes the heat balance condition on the liquid–gas contact boundary in a generalized form to correctly take into account effects of thermodiffusion and evaporation as well as energy characteristics of the surface which govern the thermocapillary response of the interface. Numerical simulation is carried out in order to ascertain the influence of the heat defect on the amplitude of interface deformations and evolution of convective regimes upon heating by thermal sources embedded in the cuvette substrate. A comparative analysis of the results obtained within the frame of classical and generalized problem statements enables to estimate the impact of energy spent by the Marangoni force to deform the interface: the effect results in a decrease in the depth of a thermocapillary dimple in the zone of thermal load and in the amplitude of phase boundary oscillations.</div></div>","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":"189 ","pages":"Article 105260"},"PeriodicalIF":3.6,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143887473","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":"The effect of collisions on the explosive dispersal of particles","authors":"Calvin J. Young ,&nbsp;Henry Pace ,&nbsp;Yash Mehta ,&nbsp;Jacob A. McFarland ,&nbsp;Jonathan D. Regele","doi":"10.1016/j.ijmultiphaseflow.2025.105261","DOIUrl":"10.1016/j.ijmultiphaseflow.2025.105261","url":null,"abstract":"<div><div>The explosive dispersal of particles produces distinct clusters or jets of particles within the expanding flow. The mechanism that precipitates this behavior is still not fully understood. Experimental data at the particle level can be difficult to obtain, as experiments often involve explosive testing. Simulations may offer additional insight into how the jetting phenomenon develops. A series of 2D simulations are performed in order to investigate the phenomenon at the mesoscale, with fully resolved particle–particle and particle–gas interactions. Particles are modeled as fully resolved cylinders via a volume penalization method. Phase interactions are captured by two-way particle–gas coupling and particle–particle collisions and momentum transfer. Two particle cloud geometries are considered in order to isolate possible sources of jetting: planar shock and compression waves impacting a rectangular particle cloud and an annular cloud about a cylindrically expanding blast wave. In each case, particle distribution within the cloud is varied with forced initial perturbations in area fraction in order to investigate the effects of spatial perturbation on cloud development. Particle positions, velocities, acceleration, and spatial auto-correlation statistics are used to characterize the evolution of the system over time. Jetting is observed to be mainly influenced by particle collisions as opposed to fluid interactions due to the time scale in which fluid structures take to form.</div></div>","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":"189 ","pages":"Article 105261"},"PeriodicalIF":3.6,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876535","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":"Corrigendum to “Single cavitation bubble dynamics in a confined planar flow” [International Journal of Multiphase Flow, Volume 188, July 2025, 105224]","authors":"Dominik Gebensleben,&nbsp;Fabian Reuter,&nbsp;Claus-Dieter Ohl","doi":"10.1016/j.ijmultiphaseflow.2025.105264","DOIUrl":"10.1016/j.ijmultiphaseflow.2025.105264","url":null,"abstract":"","PeriodicalId":339,"journal":{"name":"International Journal of Multiphase Flow","volume":"188 ","pages":"Article 105264"},"PeriodicalIF":3.6,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143942175","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}