Article
Computer Science, Interdisciplinary Applications
Maciej Matyka, Michal Dzikowski
Summary: The study simplified the Lattice Boltzmann Method algorithm by assuming constant numerical viscosity and conducted simulations to test it. The results showed that the new method is simpler and less error-prone in implementation, requiring less working memory in low Reynolds number flows but less efficient in multiphase flows. Therefore, further extension and the moments-only formulation were proposed to address this issue.
COMPUTER PHYSICS COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Wonjoo Lee, Junho Bae, Howon Lee, Seong-hoon Kang, Jonghun Yoon
Summary: A multi-phase lattice Boltzmann method-cellular automata (LBM-CA) model is developed to simulate the micro-structural morphologies of dendritic growth and porosity evolution in solidified Al-Cu alloy. The model takes into account the solidification conditions such as cooling rates and initial hydrogen concentration. The simulation results are validated by comparing with experimental data and can be used for optimizing the solidification conditions to reduce porosity defects.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Mechanics
Cui Chao, Songyi Zhong
Summary: In this study, the dynamics of a water droplet upon impacting a moving wall and the effect of wall velocity on the droplet are investigated numerically. The results show that the droplet spreads asymmetrically after impact and the deformation increases with wall velocity. The impact time of the droplet is found to decrease with increasing wall velocity for a contact angle of 156 degrees, while it increases for a contact angle of 130 degrees. Additionally, a larger critical contact angle is required for droplet rebounding from a moving wall. These findings suggest that a more hydrophobic wall is needed for repelling water droplets on a moving surface.
THEORETICAL AND COMPUTATIONAL FLUID DYNAMICS
(2022)
Article
Mathematics, Applied
Radek Fucik, Pavel Eichler, Jakub Klinkovsky, Robert Straka, Tomas Oberhuber
Summary: A general computational tool for deriving equivalent partial differential equations (EPDEs) in lattice Boltzmann method (LBM) with different collision operators is proposed. The tool can recover various dimensions of advection-diffusion equations (ADEs) and Navier-Stokes equations (NSEs). It starts with the lattice Boltzmann equation and uses spatio-temporal Taylor expansion to obtain a system of partial differential equations. An algorithm is proposed to eliminate higher order moments and recover the desired equations. The tool, named LBMAT, is implemented as open-source software for symbolic algebraic computations.
NUMERICAL ALGORITHMS
(2022)
Article
Thermodynamics
Jerome de Laborderie, Cedric Babin, Fabrizio Fontaneto
Summary: This paper validates the application of lattice Boltzmann method (LBM) to a high-subsonic high-pressure compressor stage, showing that the finest grid can accurately predict the mean flow across the machine and the influence of rotor tip gap size. The study demonstrates the relevance of using this high-fidelity method in compressor configurations by highlighting vortical structures and their evolution with operating points. Spectral analyses suggest that LBM provides a proper prediction of tonal and broadband contents in the flow.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
Article
Thermodynamics
Akanksha Tiwari, Runa Samanta, Himadri Chattopadhyay
Summary: This paper reviews the research on droplet solidification over the past 20 years, with a focus on modelling strategies. The paper enumerates modelling approaches at macro, micro and meso-scales and presents the progress in understanding the physics of droplet solidification through literature results. Additionally, applications of droplet solidification in various fields are introduced.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
procedure Alfredo Jaramillo, Vinicius Pessoa Mapelli, Luben Cabezas-Gomez
Summary: This study proposes a mesh refinement methodology for simulating phase-change heat transfer problems using pseudopotential LBM. The proposed methodology provides convergent results for pool boiling simulations when lattice discretization is refined.
APPLIED THERMAL ENGINEERING
(2022)
Article
Engineering, Chemical
Shaojun Dou, Liang Hao
Summary: The evaporation processes of sessile droplets on both heated flat and structured hydrophobic surfaces were numerically studied using a thermal multi-phase lattice Boltzmann model. The research simulated the contact-line dynamics and heat transfer during droplet evaporation, and investigated the effects of substrate heat conductivity, wettability, and roughness. It was found that the different evaporation modes of droplets on rough surfaces were due to the microscopic stick-slip motion of the contact line, with surfaces exhibiting higher hydrophobicity and smaller solid fractions more likely to undergo evaporation in the constant contact angle mode.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Mechanics
Geng Wang, Linlin Fei, Kai H. Luo
Summary: The study uses a lattice Boltzmann model to simulate the dynamics of water droplets penetrating a micropillar array in a microchannel, validating the model through experiments and conducting a parametric study. It finds that the fingering dynamics of the droplet in the longitudinal direction is governed by the competition between dynamic and capillary pressures, while permeation in the lateral and vertical directions is dominated by the capillary effect. Changing the droplet initial velocity and configuration setup significantly influences the droplet penetration velocity, maximum wetted surface area, and penetration rate.
Article
Engineering, Multidisciplinary
Xiaobo Li, Guang Fan
Summary: This article numerically studies the magneto hydrodynamic (MHD) mixed convection of titanium oxide/water nanofluids (NFs) in a T-shaped two-dimensional cavity. The results show that an increase in the slip parameter can reduce the entropy generation and slightly decrease the Nusselt number, while both of them increase when the Richardson number reaches a certain range.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Chemistry, Multidisciplinary
Bifeng Yin, Sheng Xu, Shuangyu Yang, Fei Dong
Summary: The study found that the microhole surface can achieve a superhydrophobic state, with the contact angle rapidly decreasing when the diameter is too large. As the microhole diameter increases, the relative radii of the x- and y-directions show an increasing trend, while an increasing spacing leads to a decreasing trend in the relative radii of x- and y-directions.
Article
Mathematics, Applied
Ikram Cherkaoui, Soufiene Bettaibi, Abdelwahed Barkaoui, Frederic Kuznik
Summary: This study investigates the influence of magnetic field on pulsatile blood flow and heat transfer in an artery with aneurysm using the mesoscopic lattice Boltzmann method. The results show that the application of a magnetic field enhances heat transfer in the inlet zone of the aneurysm, reduces recirculation zones, and increases wall shear stress, thereby preventing the progression of vascular diseases and rupture in the aneurysm region.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2023)
Article
Computer Science, Interdisciplinary Applications
Kumara Ari Yuana, Prima Andreanto, Eko Prasetya Budiana, Deendarlianto, Indarto
Summary: This study investigates the transient behavior of the dewetting process of a liquid film on a flat surface under a static contact angle condition using the pseudo-potential Lattice Boltzmann Method (LBM). The study considers height-to-radius thickness ratios of 0.1 and 0.05 and explores the oscillations of budding droplets and their properties. The results show that the dewetting process is influenced by both the inter-particles and solid-fluid forces.
COMPUTERS & FLUIDS
(2023)
Article
Thermodynamics
Qun Dang, Mengjie Song, Xuan Zhang, Long Zhang, Keke Shao, Jun Shen
Summary: This study experimentally investigates the solidification characteristics of deformed water droplets on inclined surfaces, and finds that the inclination angle significantly affects the contact area and frozen height, but not the horizontal movement of the vertex position.
APPLIED THERMAL ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Chen Zhou, Wen-yuan Wang, Ke-xin Chen, Ze-jian Chen, Jongwon Jung, Shuai Zhang, Yun-min Chen, Bate Bate
Summary: The role of wettability, characterized by contact angle, in two-phase immiscible phases displacement is investigated using the color gradient lattice Boltzmann method. The study finds that the saturation is related to the contact angle under different viscosity ratios and capillary numbers.
JOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE A
(2022)
Review
Thermodynamics
Shuling Guo, Ankuo Zhang
Summary: Low-temperature biopreservation is commonly used for medication storage to prolong their shelf life. However, cryo-injury can occur during cryopreservation, making it crucial to find a way to achieve long-term biopreservation without causing harm. The optimal storage temperature for different biomaterials should be investigated to improve storage efficiency. This review discusses the mechanisms of cryo-injury and biopreservation, as well as the reasons for storing biological tissues at various temperature zones. It provides valuable insights for the development of biostorage technology.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)
Article
Thermodynamics
M. Mohsin Tanveer, Craig R. Bradshaw, Joe Orosz, Greg Kemp
Summary: This study investigates the optimal geometric parameters for a spool compressor using simulation models, and the results indicate that a eccentricity ratio of 0.75 and L/D ratios between 1-1.5 can maximize the volumetric and isentropic efficiencies.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)
Article
Thermodynamics
Kongkuai Ying, Zhenhua Jiang, Wenting Wu, Jinjian Chu, Shaoshuai Liu, Yinong Wu
Summary: The Stirling/pulse tube cryocooler (SPC) is a highly efficient and long-lasting cryocooler for space applications. It has the ability to adjust the inter-stage refrigeration capacity dynamically by controlling the Stirling displacer in the first stage. This paper proposes an SPC with a second-stage active phase shifter (APS) that can control the phase difference at the second-stage hot end in real time. The experimental results show that the SPC with the APS can provide refrigeration capacity at different temperatures, with a minimum temperature of 13.5K.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)
Article
Thermodynamics
Ligeng Li, Hua Tian, Kai Liu, Yibo Wu, Xuan Wang, Xingyu Liang, Gequn Shu
Summary: This study focuses on improving the performance of carbon dioxide refrigeration systems by introducing a multi-ejector design with three controllable ejectors. Experimental analysis shows that the system's performance can be significantly improved by adopting an optimum pressure control strategy under different operating conditions.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)
Article
Thermodynamics
Joseph Al Khoury, Rabih Al Haddad, Ghiwa Shakrina, Christelle Bou Malham, Haytham Sayah, Chakib Bouallou, Maroun Nemer
Summary: This study investigates two implementation methods for calculating refrigerant thermodynamic properties and compares their performance. The results show that the implicit fitting method significantly speeds up simulation time and offers greater flexibility for modeling complex energy systems.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)
Article
Thermodynamics
Mariella Mateo-Villanueva, Rodolfo Echarri
Summary: This article details three models of different complexity levels for predicting the cold production of a solar cooling device and compares their advantages and disadvantages. The results show that the transient model underestimates the cold generation, while the equilibrium model and universal model overestimate it. The transient model is a useful tool for analyzing the impact of different variables in a solar adsorption refrigeration system, while the simpler models can be used for preliminary design and feasibility studies.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)
Article
Thermodynamics
Amin M. Elsafi, Majid Bahrami
Summary: The novel spherical micro-absorbers offer high sorption capacity and surface-to-volume ratios, solving issues such as solution carryover and corrosion associated with conventional absorbers.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)