Article
Mathematics, Applied
Qiaozhong Li, Xiaodong Niu, Zhiliang Lu, You Li, Adnan Khan, Zishu Yu
Summary: An improved single-relaxation-time multiphase lattice Boltzmann method is developed for simulating multiphase flows with large density ratios and high Reynolds numbers, showing good stability and reliability in complex multiphase flow simulations.
ADVANCES IN APPLIED MATHEMATICS AND MECHANICS
(2021)
Article
Energy & Fuels
Jinya Zhang, Hangyu Chen, Ye Zhou, Guangda Cao
Summary: This study investigated the collision mechanisms and influencing factors in the air floatation deoiling process, proposed improvement measures, and established a simulation method. The simulation results showed that the oil-gas diameter ratio, collision angle, and interphase force between oil and gas affect the collision results.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Mechanics
Qiao-Zhong Li, Zhi-Liang Lu, Zhen Chen, Chang Shu, Yang-Yang Liu, Tong-Qing Guo, Zhi-Lang Zhang
Summary: In this study, a simplified phase-field lattice Boltzmann method (SPFLBM) is proposed to efficiently simulate multiphase flows with complex interfaces and large density ratios. The method utilizes a recently developed simplified multiphase lattice Boltzmann method (SMLBM) as the basic flow solver, which directly and explicitly evolves the macroscopic variables within the lattice Boltzmann framework. The conservative Allen-Chan equation is chosen as the target equation for interface tracking and is resolved by the simplified lattice Boltzmann method. Compared with the conventional lattice Boltzmann model, the SPFLBM consumes less virtual memory and allows direct implementation of physical boundary conditions. Meanwhile, it inherits the capability of describing microscopic interactions from the standard lattice Boltzmann method and enjoys good numerical stability from the reconstruction strategy in SMLBM. Several two-dimensional numerical examples demonstrate the robustness of the proposed method for multiphase flow simulations, showing that it can handle complex interface deformation and capture subtle multiphase flow phenomena.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2023)
Article
Thermodynamics
Zheng Wang, Kaihan Xie, Yaning Zhang, Xiaodan Hou, Wenke Zhao, Bingxi Li
Summary: In this study, a multiphase pseudo-potential model based on lattice Boltzmann method was developed to predict the distributions of temperature and water content in the thawing process of frozen soil. The model accurately described the melting of ice and migration of water in the soil with low relative errors.
APPLIED THERMAL ENGINEERING
(2023)
Article
Mathematics, Applied
Xiaolei Yuan, Yao Wu, Chunhua Zhang, Zhenhua Chai, Baochang Shi
Summary: In this work, we propose a unified framework of phase-field-based multiple-relaxation-time lattice Boltzmann (MRT-LB) method for incompressible multiphase flows with density and viscosity contrasts. The framework includes the classic MRT-LB model and central-moments-based LB model (CLBM). The governing equations of incompressible multiphase flows can be accurately reproduced through direct Taylor expansion method at the second-order of expansion parameters. The present model shows better numerical stability and accuracy compared to the traditional Bhatnagar-Gross-Krook (BGK) model, and is capable of simulating multiphase flow problems with large density ratio (1000).
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2023)
Article
Computer Science, Interdisciplinary Applications
Liuming Yang, Chang Shu, Zhen Chen, Yan Wang, Guoxiang Hou
Summary: The article introduces a finite volume-based multiphase lattice Boltzmann flux solver (MLBFS), and proposes a simplified MLBFS method that reconstructs fluxes using a combination of distribution functions and macroscopic variables to improve computational efficiency. The simplified method saved up to 18.32% of computational time in some experiments.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS
(2021)
Article
Mechanics
Shi-Ting Zhang, Jin-Xiang Zhou, Hong-Wei Xiao, Xiao-Dong Niu, Huaxian Wei, Adnan Khan, De-Cai Li, Hiroshi Yamaguchi
Summary: This paper proposes a generalized conservative phase-field simplified lattice Boltzmann method for both miscible and immiscible ternary flow problems. The method extends the simplified multiphase lattice Boltzmann method (SMLBM) for two-phase flows to ternary flows by using a generalized conservative equation with Lagrange multiplier. The numerical results demonstrate that the method can effectively simulate ternary flows and accurately simulate miscible ternary flows.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2022)
Article
Computer Science, Interdisciplinary Applications
Cheng Peng, Luis F. Ayala, Orlando M. Ayala
Summary: This paper introduces a thermodynamically consistent multi-component, multiphase pseudo-potential lattice Boltzmann model that allows mass transfer across the phase interfaces and can predict the phase behavior of partially miscible hydrocarbon mixtures accurately. By splitting the total interaction force into individual components and deriving a force split factor associated with the volatility of each component, the model achieves precise thermodynamic consistency in multi-component hydrocarbon mixtures, as described by the iso-fugacity rule.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Haonan Peng, Jianmin Zhang, Xiaolong He, Yurong Wang
Summary: The paper explores the collapse process of cavitation bubbles near a rigid boundary using the double distribution function thermal lattice Boltzmann method. The simulation results show that this method is reliable for studying thermal cavitation bubble dynamics.
COMPUTERS & FLUIDS
(2021)
Article
Computer Science, Interdisciplinary Applications
Yongyong Wu, Nan Gui, Xingtuan Yang, Jiyuan Tu, Shengyao Jiang
Summary: The new decoupled MRT method improves numerical stability by eliminating errors in the original model, successfully simulating multiphase flows at different density ratios, from low Re (We) to high Re (We).
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Thermodynamics
Mohammad Javad Sayyari, Mohammad Hassan Ahmadian, Kyung Chun Kim
Summary: In this study, three-dimensional condensation in a domain filled with metal foam is investigated using the lattice Boltzmann method for the first time. The proposed two-phase pseudo-potential lattice Boltzmann model is extended to Phase-change problems and validated using various tests. The results show that increasing the size of metal foam cells can lead to nucleation and mode transition occurring at lower Jakob values.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Computer Science, Interdisciplinary Applications
T. Reis
Summary: A multiphase lattice Boltzmann model is developed for numerically solving the one-fluid flow equations for immiscible fluids. The model utilizes two solvers, one for macroscopic pressure and momentum, and another for a scalar field capturing the interface. It can handle flows with large density and viscosity ratios while maintaining distributed but narrow interfaces.
JOURNAL OF COMPUTATIONAL PHYSICS
(2022)
Article
Mechanics
Eslam Ezzatneshan, Reza Sadraei
Summary: This study investigates the effects of vibration on droplet dynamics inside a three-dimensional porous medium. The results show that contact angle significantly affects the volume and duration of droplet drainage. Hydrophilic pores hinder droplet drainage and resist vibration, while a hydrophobic surface leads to quicker drainage. The study also finds that increasing the vibration frequency can enhance droplet separation and improve drainage.
Article
Engineering, Marine
Yang Liu, Yong Peng
Summary: Through verification and application, this improved LBM model can accurately predict the collapse of cavitation bubbles, including heat transfer, and for the first time, includes the interaction between density and temperature fields in the LBM model.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Computer Science, Interdisciplinary Applications
Zhicheng Wang, Muzammil Soomro, Cheng Peng, Luis F. Ayala, Orlando M. Ayala
Summary: This study proposes two boundary condition schemes (mCBC and mNEBB) for treating pressure-driven outflow problems in multi-component multiphase flows, and demonstrates their effectiveness through numerical case studies.
COMPUTERS & FLUIDS
(2022)
Article
Thermodynamics
Mahsa Taghavi, Swapnil Sharma, Vemuri Balakotaiah
Summary: This study investigates the natural convection effects in the insulation layers of spherical storage tanks and their impact on the tanks' performance. The permeability and Rayleigh number of the insulation material are considered as key factors. The results show that as the Rayleigh number increases, new convective cells emerge and cause the cold boundary to approach the external hot boundary. In the case of large temperature differences, multiple solutions may coexist.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyang Xu, Fangjun Hong, Chaoyang Zhang
Summary: This study introduces a self-induced jet impingement device for enhancing pool boiling performance in high power electronic cooling. Through visualization and parametric investigations, the effects of this device on pool boiling performance are studied, revealing the promotion of additional liquid supply and vapor exhausting. The flow rate of the liquid jet is found to positively impact boiling performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Wenchao Ke, Yuan Liu, Fissha Biruke Teshome, Zhi Zeng
Summary: Underwater wet laser welding (UWLW) is a promising and labor-saving repair technique. A thermal multi-phase flow model was developed to study the heat transfer, fluid dynamics, and phase transitions during UWLW. The results show that UWLW creates a water keyhole, making the welding environment similar to in air laser welding.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Xingrong Lian, Lin Tian, Zengyao Li, Xinpeng Zhao
Summary: This study investigates the heat transfer mechanisms in natural fiber-derived porous structures and finds that thermal radiation has a significant impact on the thermal conductivity in low-density regions, while natural convection rarely occurs. Insulation materials derived from micron-sized natural fibers can achieve minimum thermal conductivity at specific densities. Strategies to lower the thermal conductivity include increasing porosity and incorporating nanoscale pores using nanosize fibers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Yasir A. Malik, Kilian Koebschall, Stephan Bansmer, Cameron Tropea, Jeanette Hussong, Philippe Villedieu
Summary: Ice crystal icing is a significant hazard in aviation, and accurate modeling of sticking efficiency is essential. In this study, icing wind tunnel experiments were conducted to quantify the volumetric liquid water fraction, sticking efficiency, and maximum thickness of ice layers. Two measurement techniques, calorimetry and capacitive measurements, were used to measure the liquid water content and distribution in the ice layers. The experiments showed that increasing wet bulb temperatures and substrate heat flux significantly increased sticking efficiency and maximum ice layer thickness.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinqi Hu, Tongtong Geng, Kun Wang, Yuanhong Fan, Chunhua Min, Hsien Chin Su
Summary: This study experimentally examined the heat dissipation of vibrating fans and demonstrated its inherent mechanism through numerical simulation. The results showed that the flow fields induced by the vibrating blades exhibited pulsating features and formed large-scale and small-scale vortical structures, significantly improving heat dissipation. The study also identified the impacts of different blade structures and developed a trapezoidal-folding blade, which effectively reduced the maximum temperature of the heat source and alleviated high-temperature failure crisis.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Dan-Dan Su, Xiao-Bin Li, Hong-Na Zhang, Feng-Chen Li
Summary: The boiling heat transfer of low-boiling-point working fluid is a common heat dissipation technology in electronic equipment cooling. This study analyzed the interfacial boiling behavior of R134a under different conditions and found that factors such as the initial thickness of the liquid film, solid-liquid interaction force, and initial temperature significantly affect the boiling mode and thermal resistance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyi Wu, Dongke Sun, Wei Chen, Zhenhua Chai
Summary: A unified lattice Boltzmann-phase field scheme is proposed to simulate dendrite growth of binary alloys in the presence of melt convection. The effects of various factors on the growth are investigated numerically, and the model is validated through comparisons and examinations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shaokun Ge, Ya Ni, Fubao Zhou, Wangzhaonan Shen, Jia Li, Fengqi Guo, Bobo Shi
Summary: This study investigated the temperature distribution of main cables in a suspension bridge during fire scenarios and proposed a prediction model for the maximum temperature of cables in different lane fires. The results showed that vehicle fires in the emergency lane posed a greater thermal threat to the cables.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shuang-Ying Wu, Shi-Yao Zhou, Lan Xiao, Jia Luo
Summary: This paper investigates the two-phase flow and heat transfer characteristics of low-velocity jet impacting on a cylindrical surface. The study reveals that the heat transfer regimes are non-phase transition and nucleate boiling with the increase of heat transfer rate. The effects of jet impact height and outlet velocity on local surface temperatures are pronounced at the non-phase transition stage. The growth rates of heat transfer rate and liquid loss rate increase significantly from the non-phase transition to nucleate boiling stage.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Emad Hasani Malekshah, Wlodzimierz Wlodzimierz, Miros law Majkut
Summary: Cavitation has significant practical importance and can be controlled by air injection. This study investigates the natural to ventilated cavitation process around a hydrofoil through numerical and experimental methods. The results show that the location and rate of air injection have a meaningful impact on the characteristics of cavitation.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Feriel Yahiat, Pascale Bouvier, Antoine Beauvillier, Serge Russeil, Christophe Andre, Daniel Bougeard
Summary: This study explores the enhancement of mixing performance in laminar flow equipment by investigating the generation of chaotic advection using wall deformations in annular geometries. The findings demonstrate that the combined geometry can achieve perfect mixing at various Reynolds numbers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Hui He, Ning Lyu, Caihua Liang, Feng Wang, Xiaosong Zhang
Summary: This study investigates the condensation, frosting, and defrosting processes on superhydrophobic surfaces with millimeter-scale structures. The results reveal that the structures can influence the growth and removal of frost crystals, with the bottom grooves creating a frost-free zone and conical edges promoting higher frost crystal heights. Two effective methods for defrosting are observed: hand-lifting the groove and airfoil retraction contraction on protruding structures. This research provides valuable insights into frost formation and defrosting on millimeter-structured superhydrophobic surfaces, with potential applications in anti-frost engineering.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Thiwanka Arepolage, Christophe Verdy, Thibaut Sylvestre, Aymeric Leray, Sebastien Euphrasie
Summary: This study developed two thermal concentrators, one with a 2D design of uniform thickness and another with a 3D design, using the coordinate transformation technique and metamaterials. By structuring the thermal conductor, the desired local density-heat capacity product and anisotropic thermal conductivities were achieved. The homogenized thermal conductivities were obtained from finite element simulations and cylindrical symmetry consideration. A 3D concentrator was fabricated using 3D metal printing and characterized using a thermal camera. Compared to devices that solely consider anisotropic conductivities, the time evolution characteristics of the metadevice designed with coordinate transformation were closer to those of an ideal concentrator.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Liangyuan Cheng, Qingyang Wang, Jinliang Xu
Summary: In this study, we investigated the supercritical heat transfer of CO2 in a horizontal tube with a diameter of 10.0 mm, covering a wide range of pressures, mass fluxes, and heat fluxes. The study revealed a non-monotonic increase in wall temperatures along the flow direction and observed both positive and negative wall temperature differences between the bottom and top tube. The findings were explained by the thermal conduction in the solid wall interacting with the stratified-wavy flow in the tube.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)