Article
Thermodynamics
Haoyang Li, Bing Liu, Lanqing Qiao, Xiaoyue Zhang, Jianyu Tan
Summary: In this paper, the boiling mechanism of electronic chips under periodic pulse heating conditions was explored using the lattice Boltzmann model (LBM). The effects of square-wave pulse heating conditions on boiling heat transfer were studied, and the differences between pulse and constant heating conditions were discussed. The results showed that pulse heating conditions affected the detachment of boiling bubbles and the critical heat flux (CHF), with significant impacts on the bubble motion in the nucleate boiling regime.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Mechanics
Hao Wang, Dongxue Guan, Xianbing Ji, Jinliang Xu
Summary: A novel boiling surface with an extended thin film structure was designed to improve the critical heat flux (CHF) in boiling heat transfer. Experimental results showed that the extended thin film induced uneven temperatures on the boiling surface, triggering mixed boiling and leading to a significant CHF enhancement. The analysis revealed that the mutual interference between nucleate boiling and film boiling effectively inhibited heat transfer deterioration, with an optimal extended film height of 4.0 mm for maximum boiling heat transfer performance.
Article
Mechanics
Kun He, Yong Zhao, Lei Wang
Summary: This study investigates the electrohydrodynamic enhancement of solid-liquid phase change in three-dimensional cavities using the lattice Boltzmann method. The results show that the interface morphologies obtained from pure electro-convection and pure thermo-convection are significantly different. The melting performance is mainly dominated by the Coulomb force when the electric driving parameter T is sufficiently high, and the aspect ratio of the enclosure affects the electro-convection inhibition.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2023)
Article
Physics, Multidisciplinary
Arash Shams Taleghani, Mahdi Sheikholeslam Noori
Summary: This study numerically investigates the coalescence dynamics of droplets on a wettable substrate subjected to surface acoustic waves (SAW). The results show that SAW can induce droplet coalescence and that increasing wave amplitude can reduce connection time. In the jetting mode, different dynamical behaviors are observed and an optimal SAW wave amplitude is identified for droplet removal.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Environmental Sciences
Zehao Huang, Wei Diao, Jiayang Wu, Yongguang Cheng, Wenxin Huai
Summary: The study introduces a TDF LB model for flow-temperature-concentration coupling simulations and describes key techniques for its implementation. By validating cases and analyzing variations in the upper reservoir, the applicability of the LB model is demonstrated.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Mechanics
Ehsan Kian Far, Mohsen Gorakifard, Mojtaba Goraki Fard
Summary: This paper proposes a new three-dimensional phase-field model using the cumulant lattice Boltzmann method to simulate soluble surfactants. The proposed method overcomes limitations of current models by obtaining parameters directly from initial interfacial tension and bulk surfactant and using a new equilibrium distribution function to minimize Galilean invariance violation. It accurately simulates various behaviors related to interfacial tension and surfactants, such as the breaking-up and coalescence of droplets and the breakage of a liquid thread at a high viscosity ratio.
Article
Thermodynamics
Shaojun Dou, Liang Hao, Hong Liu
Summary: A lattice Boltzmann pseudopotential model was used to study the pool boiling processes of pure water and NaCl solutions, revealing the effects of solute concentration on equilibrium vapor pressure reduction and boiling point rise. Differences in bubble behaviors and heat flux evolutions were analyzed, showing that heat flux differences between water and NaCl solutions are influenced by nucleation site density, bubble departure frequency, and bubble interactions at different superheats.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Yinglei Guo, Yuhua Lai, Shuai Wang, Lin Wang
Summary: The relationship between bubble dynamics and boiling heat transfer on a vertical heating wall is investigated using the lattice Boltzmann method. The results show that the vapor phase covering the vertical surface increases with increasing contact angle, leading to difficulty in bubble detachment and reduction of bubble volume. The physical properties of the three-phase contact line and bubble dynamics exhibit strong coupling characteristics due to the interaction of buoyancy force and bubble growth under the vertical heating wall. In addition, the heat flux on hydrophilic and hydrophobic surfaces is enhanced by 98% and reduced by 75% compared to that on the neutral surface.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Z. G. Xu, J. Qin, X. F. Ma
Summary: This study experimentally investigated bubble growth and pool boiling heat transfer characteristics on semi-modified pillar arrays at atmospheric pressure. Numerical simulations revealed bubble behaviors inside pillar gaps at different contact angles. The results showed significant effects of surface treatment and additives on bubble behaviors and heat transfer processes.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Juan Shi, Dongyang Feng, Zhenqian Chen, Qiang Ma
Summary: In this paper, numerical methods are used to study pool boiling heat transfer on a hydrophilic metal foam surface. The pseudopotential MRT lattice Boltzmann method is employed to solve the flow field, and a finite-difference scheme is used for phase change. The effects of metal foam porosity and pore size on heat transfer are investigated, and boiling curves are obtained to analyze heat transfer performance and bubble behavior at different wall superheats. The model is validated by comparing bubble behavior with experimental results.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Jiajun Wang, Gangtao Liang, Xiangwei Yin, Shengqiang Shen
Summary: In this study, pool boiling on micro-pillar structured surfaces was investigated using a three-dimensional pseudo potential phase-change lattice Boltzmann method. The joint enhancing effects of surface wettability and pillar geometrical parameters on bubble nucleation and boiling performance were analyzed. It was found that on neutral and hydrophobic surfaces, increasing the spacing of micro pillars delayed nucleation, but reduced the temperature inside the vapor film and improved heat conduction. On hydrophilic surfaces, the impact of pillar spacing on nucleation was non-monotonic and more complex, with an enhanced heat flux and significantly different nucleation positions.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Liu Zhongyi, Qin Jie, Wu Ziheng, Yue Sijia, Xu Zhiguo
Summary: In this study, pool boiling heat transfer performance and bubble behaviors of hybrid structures with metal foam and square column are investigated using the lattice Boltzmann method. The results show that the hybrid structure performs better than the pure columnar structure in pool boiling heat transfer. The hybrid structure accelerates bubble growth by fluid disturbance while metal skeletons prevent bubble escaping. The optimum ratio of column width to gap spacing decreases with the increase of heat flux and HTC can achieve an increase up to 25% when W/D changes from 5/3 to 1/3. The increase of column height enhances heat transfer by expanding surface area and providing space for bubble motion. The metal foam thickness and porosity have a little influence on pool boiling heat transfer performance but have an important effect on bubble motion in the regime.
JOURNAL OF THERMAL SCIENCE
(2022)
Article
Thermodynamics
Yu Song, Xingsen Mu, Jiajun Wang, Shengqiang Shen, Gangtao Liang
Summary: Numerical simulations were conducted to study channel flow boiling on hybrid wettability surfaces using a two-dimensional lattice Boltzmann method coupled with a thermal phase transition model. The heat transfer performance between single wettability surfaces and hybrid wettability surfaces was compared, and it was found that the heat flux on the hybrid surface was higher. The impacts of contact angle and geometrical parameters on heat flux were analyzed, and the 30 degrees /120 degrees hybrid wettability surface showed the best heat transfer performance.
APPLIED THERMAL ENGINEERING
(2023)
Article
Engineering, Chemical
Guoqiang Wu, Sheng Chen
Summary: A numerical approach based on LBM coupled with IBM is used to study the 3D coating process of a moving droplet against a moving particle. The effects of particle-droplet size ratio, Weber number, and collision factor on the coating process are considered. Three coating regimes are identified: full coating, partial coating, and disintegration, with sub-regimes within each regime based on Weber number. The findings provide guidance for various industrial applications.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Energy & Fuels
Qifan Zou, Xiuliang Liu, Yongyan Hu, Yuxuan Chang, Pengkun Li
Summary: This study investigated pool boiling under heaving conditions using numerical simulations and found that heat transfer under heaving conditions at low superheat is somewhat enhanced, while it is weakened at high superheat compared to static conditions. Additionally, distinct fluctuations in transient heat flux were observed for all boiling regimes under heaving conditions, and heaving had positive and negative effects on pool boiling heat transfer in high-gravity and low-gravity regions, respectively. Moreover, greater impact on pool boiling heat transfer was observed with larger heaving height and shorter period time.
FRONTIERS IN ENERGY RESEARCH
(2021)
Article
Thermodynamics
Mostafa Safdari Shadloo
Summary: This study focuses on the application of least-square support vector machines (LS-SVM) for predicting convection heat transfer coefficient of nanofluids through circular pipes, showing that the LS-SVM paradigm with a radial basis kernel outperforms other approaches with an absolute average relative deviation of 2.47% and a regression coefficient (R-2) of 0.99935. The proposed LS-SVM model expedites the estimation of convection HTC of nanofluid flow inside circular pipes.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2021)
Article
Family Studies
Rasoul Sadeghi, Victor Agadjanian
Summary: The study reveals that urban Afghan youth have moderately liberal attitudes towards premarital sex, with almost one quarter of them having engaged in sexual behaviors. Findings indicate that attitudes and behaviors towards premarital sex are significantly associated with individual characteristics, family dynamics, and social interactions.
CULTURE HEALTH & SEXUALITY
(2022)
Editorial Material
Energy & Fuels
Akbar Maleki, Mohammad Alhuyi Nazari, Mostafa Safdari Shadloo, Weiping Zhang
FRONTIERS IN ENERGY RESEARCH
(2022)
Review
Agricultural Engineering
Babak Aghel, Sara Behaein, Somchai Wongwises, Mostafa Safdari Shadloo
Summary: This paper introduces the composition, application, and conversion of biogas into biomethane. It discusses the common technologies and recent studies on CO2 removal, as well as the merits and demerits of these methods.
BIOMASS & BIOENERGY
(2022)
Article
Energy & Fuels
Fatemeh Almasi, Manuel Hopp-Hirschler, Abdellah Hadjadj, Ulrich Nieken, Mostafa Safdari Shadloo
Summary: This paper investigates the coupled effects of electrohydrodynamic and thermocapillary on the dynamic behavior of a liquid droplet. The results show that when subjected to a vertical electric field and thermal gradient, the droplet stretches horizontally and approaches a break-up condition at a high rate of electrical permitivity. The combined effect of thermal gradient and electric field further pushes the droplet towards the break-up regime.
Article
Physics, Fluids & Plasmas
M. Celep, A. Hadjadj, M. S. Shadloo, S. Sharma, M. Yildiz, M. J. Kloker
Summary: Contrary to incompressible flows, there has been a major research gap in utilizing velocity streaks for flow transition control in supersonic flows. The present study investigates the controlling capability of decaying streak modes under different thermal boundary conditions using DNS. The results show that the stabilizing/destabilizing influence of the control streaks in a perturbed boundary layer is not significantly affected by the wall-boundary conditions.
PHYSICAL REVIEW FLUIDS
(2022)
Article
Geriatrics & Gerontology
Nasibeh Zanjari, Rasoul Sadeghi
Summary: This article assesses the well-being of older adults in Iran using the AgeWatch index and reveals significant differences between provinces. The study finds that Iran performs well in terms of health status but poorly in terms of capacity dimension. The conclusion emphasizes the importance of economic and social policies that support older adults' employment, income, health, and independence in enhancing their well-being.
SALMAND-IRANIAN JOURNAL OF AGEING
(2022)
Article
Engineering, Multidisciplinary
Mehran Vakilha, Manuel Hopp-Hirschler, Mostafa Safdari Shadloo
Summary: This paper presents a new Lagrangian meshless method (EISPH) for solving multiphase flow problems. By approximating the pressure change between consecutive time-steps, this method can effectively solve multiphase flow problems with small time steps, and its accuracy is validated through comparisons with analytical solutions or existing literature.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2022)
Review
Green & Sustainable Science & Technology
Babak Aghel, Sara Janati, Somchai Wongwises, Mostafa Safdari Shadloo
Summary: This review article examines the procedure of CO2 removal through chemical amine solvents and the challenges associated with high energy requirements for solvent regeneration. The article investigates two approaches: the development of new solvents and the use of high-capacity amine blends, and the modification of operational conditions and integration with thermal power plants to reduce energy consumption.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2022)
Article
Engineering, Multidisciplinary
Kitti Nilpueng, Preecha Kaseethong, Mehrdad Mesgarpour, Mostafa Safdari Shadloo, Somchai Wongwises
Summary: This study introduces a new physics-informed neural network (PINN)-based prediction method to determine the temperature pattern of fluid and fins when flow passes over plate-circular/plate-square pin fin heat sinks. The proposed method is based on calculating the velocity pattern on the fins' surface. After careful validation with experimental data and sensitivity analysis, the thermal behavior of the heat sinks are determined, showing temperature and vorticity differences between different heat sinks.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2022)
Article
Thermodynamics
G. P. Vanitha, U. S. Mahabaleshwar, M. S. Shadloo
Summary: This study investigates the effects of suction/injection, radiation, thermophoresis, and permeable stretching sheet on mixed convection viscoelastic fluid flow and heat transfer. The nondimensionalized dimensional equation is solved analytically to analyze the behavior of physical parameters influencing temperature and concentration field. The results have significant importance in engineering applications where the heat transfer of the fluid is controlled.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Multidisciplinary
Sara Behaien, Babak Aghel, Mostafa Safdari Shadloo
Summary: In this study, biogas was upgraded by removing CO2 using three absorbents in a microchannel system. The effects of operating variables were investigated, and a quadratic model was proposed to predict the response. The experimental values matched the model values well.
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Mehrdad Mesgarpour, Omid Mahian, Ping Zhang, Somchai Wongwises, Lian-Ping Wang, Goodarz Ahmadi, Sandro Nizetic, Mikhail Sheremet, Mostafa Safdari Shadlooj
Summary: Sedimentation has a direct impact on the thermal performance and efficiency of thermal systems. This study investigates the deposition of nanoparticles inside a tube for possible application in parabolic solar collectors. A combination of lattice Boltzmann and control finite volume methods is used for realistic simulation, and the results are used to train a deep feed-forward neural network to visualize and predict sedimentation behavior. This research provides valuable insights into particle behavior and parameter variation near the surface, and has implications for predicting service periods and cost savings in heat transfer equipment maintenance.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Area Studies
Mohammad Mirzaei, Rasoul Sadeghi
Summary: Over the past half-century, Iran has experienced a significant demographic transition, with declining population growth and total fertility rate below-replacement level. Life expectancy has increased significantly, and there have been important changes in the age structure of the population, indicating Iran's entry into a demographic window of opportunity.
MIDDLE EAST CRITIQUE
(2023)
Review
Thermodynamics
Arman Haghighi, Akbar Maleki, Mamdouh El Haj Assad, Lingen Chen, Mohammad Alhuyi Nazari, Mostafa Safdari Shadloo
Summary: Heat pipes are widely used for thermal management in high heat flux devices. Special working fluids such as hydrogen, neon, and nitrogen are necessary for efficient heat transfer at very low temperatures. The performance of cryogenic heat pipes depends on factors like filling ratio, input power, and working fluid, with their effective thermal conductivity surpassing that of conductive metals significantly. Further research is recommended to enhance the performance of cryogenic heat pipes.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
