Article
Thermodynamics
Haibo Li, Maocheng Tian, Min Wei, Jingzhi Zhang
Summary: This study numerically investigates the direct-contact condensation (DCC) and boiling issues using the Lee model. A new mass transfer coefficient correlation is proposed and its accuracy is confirmed through experimental results. The study reveals that the mass transfer rate causes velocity fluctuations at the interface, affecting the condensation mass transfer rate.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Mohammad Bahreini, Javad Farrokhi Derakhshandeh, Abas Ramiar, Esmail Dabirian
Summary: Numerical studies were conducted to investigate the condensation behavior of single and multiple bubbles in subcooled boiling flow. The results showed that factors such as bubble size, liquid subcooling, and flow velocity significantly affect the bubble deformation behavior and condensation rate. Interaction between bubbles in multiple bubble systems led to more complex dynamic condensation behavior compared to single bubbles.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Weikai Yin, Haifeng Gu, Pei Yu, Yanmin Zhou, Qi Wu, Xiang Yu
Summary: This paper investigates the pressure oscillations characteristics of sonic steam-air jets in subcooled water. The occurrence of the back-attack phenomenon is observed, and the intensity and dominant frequency of pressure oscillation are analyzed. Empirical equations for predicting the radius of steam bubble and the oscillation frequency of steam-air jets are proposed.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2022)
Article
Thermodynamics
Zhuoran Dang, Yang Zhao, Guanyi Wang, Jingyu Du, Mamoru Ishii
Summary: This study focused on analyzing the interfacial characteristics of the transition from subcooled boiling to saturated boiling flow, revealing that the two-group interfacial area transport equations provided good predictions for the transition phenomena. The study also identified a defect in the existing condensation model and proposed a rigorous approach to estimate the boundary diameter for classifying the two condensation mechanisms.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Hasan Alimoradi, Mehrzad Shams, Nasser Ashgriz, Ali Bozorgnezhad
Summary: In this study, a new model was developed to investigate the effect of surface roughness on subcooled flow boiling, showing that microstructure surface roughness can decrease wall surface temperature, and increase vapor volume fraction and heat transfer coefficient.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Mechanics
Jiguo Tang, Xiao Li, Lingmiao Xu, Licheng Sun
Summary: Microbubble emission boiling (MEB) achieves high heat transfer beyond critical heat flux under highly subcooled boiling conditions. This study investigates the behavior of a vapor bubble and its induced liquid flow during subcooled boiling using high-speed two-phase particle image velocimetry method. Results show that MEB is accompanied by a rapid oscillating flow outside the bubble, which is different from nucleate boiling. The heat transfer of MEB is found to be dependent on liquid subcooling and heat flux, and a scaling law is derived for MEB heat transfer.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Thermodynamics
Riccardo Pelaccia, Paolo E. Santangelo
Summary: Extrusion of aluminum alloys is widely used to manufacture various products, but heat generated during the process can cause defects and reduce tool life. Effective die cooling is crucial for high product quality and production rate. This research explored the homogeneous-flow approach to consider both the liquid and gas phases, successfully capturing the physics and quantitatively assessing the cooling effect.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Nuclear Science & Technology
Monica Pham, Guillaume Bois, Fabrice Francois, Emilio Baglietto
Summary: Multiphase Computational Fluid Dynamics (M-CFD) has the potential to accurately simulate complex boiling phenomena in Light Water Reactors (LWRs), speeding up development and reducing the need for large-scale experiments. However, the understanding of closure models' ability to capture the underlying physics is still incomplete, restricting the use of M-CFD in reactor development and design optimization. This study conducted benchmarking using measured void fraction profiles from subcooled flow boiling experiments, evaluating heat flux partitioning formulations and closure relations. The results provide a closure representation that consistently predicts and is applicable to prototypical PWR conditions.
NUCLEAR ENGINEERING AND DESIGN
(2023)
Article
Thermodynamics
Qiang Xu, Liang Liang, Yonglu She, Xiangdong Xie, Liejin Guo
Summary: This study establishes a numerical model and simulation method to describe the condensation process of steam jet in subcooled water using direct contact method. The experiments show the relationship between steam pressure and condensation heat transfer coefficient under different conditions.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Zheng Liu, Zhiyi Yu, Weihua Sun, Ke Zhang
Summary: The phase change model has gained attention for flow-boiling numerical simulation research. Comparing and evaluating the different models is important for developing an efficient and accurate phase change model. In this study, two new models (Dong and Chen) were added to FLUENT software using a unique user-defined function (UDF). The models were compared in terms of flow and heat transmission properties, and the results were validated through visual studies and flow-boiling heat transfer correlations. The Chen model showed an advantage in predicting flow characteristics, while the Lee and Dong models were better at forecasting the heat transfer coefficient.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Mechanics
F. J. Collado
Summary: This work presents preliminary results of a new void fraction model in subcooled flow boiling, based on new mass and energy balances. The model predicts the slip ratio profile, calculates the mixture enthalpy, and derives the void fraction. The study also establishes the first equation for the slip evolution and finds a second kinematic equation between the onset of nuclear boiling and the vapor velocity.
Article
Thermodynamics
Qiang Xu, Yongshuai Zhu, Haozu Zhou, Yonglu She, Liejin Guo
Summary: Gas-liquid two-phase jet condensation is highly efficient in heat and mass transfer, making it crucial for the optimization design and safe operation of industrial processes. In this study, a numerical simulation method was developed to investigate steam-water two-phase jet condensation, focusing on the shape of the steam plume, pressure and velocity distribution, and heat and mass transfer at the two-phase interface. The results showed that as the steam mass flux increased, the steam plume lengthened and transformed from a cone to a cylinder-cone shape. The heat transfer coefficients varied from 1.71 MW/m(2) K to 3.51 MW/m(2) K based on the interfacial area of the steam plume, and from 2398.80 MW/m(3) K to 5040.07 MW/m(3) K based on the volume of the two-phase region.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Feng Liu, Zhongning Sun, Haozhi Bian, Ming Ding, Xianke Meng
Summary: This study combines experiments and numerical simulations to investigate the flow patterns of a multi-component gas mixture under various conditions. The formation mechanism of typical flow patterns is revealed and boundary conditions for flow pattern transitions are quantified. An empirical correlation is proposed to classify the flow patterns.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Il Woong Park, In Yeop Kang, Hyun Jin Yong
Summary: This study classified bubbles in two-phase flow and revealed the relationship between periodic bubble behavior and flow instability, providing an important theoretical basis for improving the application of flow boiling systems.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Review
Nuclear Science & Technology
Jue Wang, Lisheng Chen, Qi Cai, Chen Hu, Cong Wang
Summary: Experimental and theoretical studies on submerged steam jets condensed in water pools for pressure relief systems and pressure suppression systems, such as in nuclear power plants, have revealed differences and challenges that require further research. The introduction of computational fluid dynamics (CFD) techniques in recent years, validated by experimental data, has led to some achievements in simulating the flow and heat transfer characteristics of steam jets.
NUCLEAR ENGINEERING AND DESIGN
(2021)
Article
Engineering, Mechanical
Sivaranjani Sivalingam, SalaiSargunan S. Paramanantham, Warn-Gyu Park
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2018)
Article
Engineering, Mechanical
SalaiSargunan S. Paramanantham, Thanh-Hoang Phan, Warn-Gyu Park
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2020)
Article
Multidisciplinary Sciences
SalaiSargunan S. Paramanantham, Dong-Hyun Kim, Warn-Gyu Park
Article
Chemistry, Multidisciplinary
Ye-Bon Seo, SalaiSargunan S. Paramanantham, Jin-Yeong Bak, Byongjo Yun, Warn-Gyu Park
APPLIED SCIENCES-BASEL
(2020)
Article
Chemistry, Multidisciplinary
Dong-Hyun Kim, SalaiSargunan S. Paramanantham, Warn-Gyu Park
APPLIED SCIENCES-BASEL
(2020)
Article
Energy & Fuels
Mukesh Upadhyay, Ayeon Kim, SalaiSargunan S. Paramanantham, Heehyang Kim, Dongjun Lim, Sunyoung Lee, Sangbong Moon, Hankwon Lim
Summary: Hydrogen production through electrochemical water splitting is crucial for expanding renewable energy sources and establishing a sustainable energy society. The proton exchange membrane (PEM) water electrolyser technology is ideal for coupling with renewable energy sources, and researchers have utilized bench-scale experiments and CFD simulation to analyze performance parameters and improve efficiency.Validation of the developed CFD model against in-house experiments has successfully predicted the current-voltage polarization curve and provided insights into factors affecting PEM water electrolyser performance.
Article
Green & Sustainable Science & Technology
Manhee Byun, Rofice Dickson, Boris Brigljevic, Boreum Lee, Dongjun Lim, Mukesh Upadhyay, Salai Sargunan S. Paramanatham, Vijay Mohan Nagulapati, Junaid Haider, Hankwon Lim
Summary: With the collapse of the global recycling industry following the China import ban in 2017, the amount of plastic waste has been increasing rapidly. This study introduces a proof of concept for a biomass heating and plastic-derived pyrolytic oil production cogeneration system, and evaluates a disruptive business model for decentralized plastic pyrolysis. The initial assessment suggests that the decentralized model can increase profitability and reduce transportation costs and CO2 emissions.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Nuclear Science & Technology
Vijay Mohan Nagulapati, SalaiSargunan S. Paramanantham, Aleksey Ni, Senthil Kumar Raman, Hankwon Lim
Summary: By employing machine learning techniques, researchers have successfully predicted the lifespan of subcooled condensing bubbles without the need for extensive experiments and numerical studies. The predicted results show good agreement with the actual data and provide a better understanding of the condensation behavior of subcooled bubbles.
NUCLEAR ENGINEERING AND DESIGN
(2022)
Article
Thermodynamics
S. S. S. Paramnantham, V. M. Nagulapati, H. Lim
Summary: This study investigates the droplet generation and breakup behavior of immiscible fluids in microchannels through numerical simulations. The effects of microchannel structures, viscosities, wetted wall contact angles, surface tension, and flow rate on droplet generation and breakup are studied.
JOURNAL OF APPLIED FLUID MECHANICS
(2022)
Article
Engineering, Mechanical
Rosaria Del Toro, Maria Laura De Bellis, Marcello Vasta, Andrea Bacigalupo
Summary: This article presents a multifield asymptotic homogenization scheme for analyzing Bloch wave propagation in non-standard thermoelastic periodic materials. The proposed method derives microscale field equations, solves recursive differential problems within the unit cell, establishes a down-scaling relation, and obtains average field equations. The effectiveness of this approach is validated by comparing dispersion curves with those from the Floquet-Bloch theory.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Yue Bao, Zhengcheng Yao, Yue Zhang, Xueman Hu, Xiandong Liu, Yingchun Shan, Tian He
Summary: This paper proposes a novel triple-gradient phononic acoustic black hole (ABH) beam that strategically manipulates multiple gradients to enhance its performance. The study reveals that the ABH effect is not solely brought about by the thickness gradient, but also extends to the power-law gradients in density and modulus. The synergistic development of three different gradient effects leads to more pronounced and broader bandgaps in PCs.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Matthias Ryser, Jason Steffen, Bekim Berisha, Markus Bambach
Summary: This study investigates the feasibility of replacing complex experiments with multiple simpler ones to determine the anisotropic yielding behavior of sheet metal. The results show that parameter identifiability and accuracy can be achieved by combining multiple specimen geometries and orientations, enhancing the understanding of the yield behavior.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Wenjun Li, Pengfei Zhang, Siyong Yang, Shenling Cai, Kai Feng
Summary: This study presents a novel two-dimensional non-contact platform based on Near-field Acoustic Levitation (NFAL), which can realize both one-dimensional and two-dimensional transportation. Numerical and experimental results prove the feasibility and ease of this method.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Shuo Liu, Lu Che, Guodong Fang, Jun Liang
Summary: This study presents a novel lamina conjugated bond-based peridynamic (BB-PD) model that overcomes the limitations of material properties and is applicable to composite laminates with different stacking sequences. The accuracy and applicability of the model are validated through simulations of elastic deformation and progressive damage behavior, providing an explanation of the damage modes and failure mechanisms of laminated composite materials subjected to uniaxial loading.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Omar El-Khatib, S. Kumar, Wesley J. Cantwell, Andreas Schiffer
Summary: Sandwich-structured honeycombs (SSHCs) are hierarchical structures with enhanced mass-specific properties. A model capable of predicting the elastic properties of hexagonal SSHCs is presented, showing superior in-plane elastic and shear moduli compared to traditional honeycombs, while the out-of-plane shear moduli are reduced.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Zhi-Jian Li, Hong-Liang Dai, Yuan Yao, Jing-Ling Liu
Summary: This paper proposes a process-performance prediction model for estimating the yield strength and ultimate tensile strength of metallic parts fabricated by powder bed fusion additive manufacturing. The effect of main process variables on the mechanical performance of printed metallic parts is analyzed and the results can serve as a guideline for improvement. The accuracy of the proposed model is validated by comparison with literature.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Saman A. Bapir, Kawa M. A. Manmi, Rostam K. Saeed, Abdolrahman Dadvand
Summary: This study numerically investigates the behavior of an ultrasonically driven gas bubble between two parallel rigid circular walls with a cylindrical micro-indentation in one wall. The primary objective is to determine the conditions that facilitate the removal of particulate contamination from the indentation using the bubble jet. The study found that the bubble jet can effectively remove contamination from the indentation for certain ranges of indentation diameter, but becomes less effective for larger indentation diameters.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
E. Polyzos, E. Vereroudakis, S. Malefaki, D. Vlassopoulos, D. Van Hemelrijck, L. Pyl
Summary: This research investigates the elastic and damage characteristics of individual composite beads used in 3D printed composites. A new analytical probabilistic progressive damage model (PPDM) is introduced to capture the elastic and damage attributes of these beads. Experimental results show strong agreement with the model in terms of elastic behavior and ultimate strength and strain.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
