Article
Thermodynamics
Wen Luo, Huaizhi Han, Rongpei Jiang, Ruitian Yu, Quan Zhu
Summary: This study conducted a numerical simulation to compare the heat transfer performance of straight and crescent ribs in a regenerative cooling microrib structure channel. The results demonstrated that the crescent rib channel exhibited superior heat transfer performance compared to the rectangular rib channel.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Green & Sustainable Science & Technology
Changhui Liu, Yu Qiao, Peixing Du, Jiahao Zhang, Jiateng Zhao, Chenzhen Liu, Yutao Huo, Cong Qi, Zhonghao Rao, Yuying Yan
Summary: The paper summarizes recent progress in the preparation of nanofluids and their application in micro/nano scale heat and mass transfer, emphasizing the significance of nanofluids in efficient heat transfer and energy conservation.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Engineering, Environmental
Hongqiang Chen, Yonghai Zhang, Lei Huang, Xiong Zhao, Xiang Ma, Zihuan Ma, Junsheng Hou, Jinjia Wei, Paolo Di Marco, Omid Mahian, Nanjing Hao
Summary: This article presents a simple and straightforward microfluidic strategy for synthesizing functional silica nanofluids with excellent stability. The use of these nanofluids in microchannel flow boiling significantly enhances the heat transfer coefficient and critical heat flux, providing a promising solution for thermal management in high-power electronics.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
Jian Sun, Weihan Wang, Jinghua Zhang, Renping Zhang, Jie Li
Summary: The research introduces a microfluid coupled array finned microchannel heat sink for cooling highpower concentrated solar cells, using SiC-W nanofluids as the cooling medium. The study shows that SiC nanofluids exhibit better cooling properties than water and improve heat transfer performance.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Waqar Ahmed, Z. Z. Chowdhury, S. N. Kazi, Mohd Rafie Bin Johan, Ali H. Abdelrazek, H. Fayaz, Irfan Anjum Badruddin, M. A. Mujtaba, Manzoore Elahi M. Soudagar, Naveed Akram, Shahid Mehmood, Muhammad Shakeel Ahmad, Sarfaraz Kamangar, T. M. Yunus Khan
Summary: This study investigates the thermal and hydrodynamic characteristics of different concentrations of ZnO-DW nanofluids in a closed single-tube circular heat exchanger through experimental and ANSYS modeling methods. The results indicate that the 0.1% ZnO-DW based nanofluids exhibit the highest heat transfer coefficient and efficiency. Both experimental and numerical results show promising and similar outcomes.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Chemistry, Analytical
Huajie Wu, Shanwen Zhang
Summary: Adjusting the nanoparticle volume fraction and aspect ratio of microchannels has a significant impact on improving the heat transfer capacity of nanofluids, but may increase the pumping power of the system; increasing the aspect ratio of microchannels effectively enhances the heat transfer capacity of heat sinks, but the heat transfer coefficient does not continue to increase beyond a certain value.
Article
Thermodynamics
A. Gonzalez, O. Ruz, E. Castillo
Summary: The study evaluates the impact of different Newtonian and non-Newtonian nanofluids on heat transfer efficiency in microchannels, finding that the shear-thinning behavior of nanofluids is crucial for enhancing heat transfer rates.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Engineering, Mechanical
Hamid Kazemi Moghadam, Seyed Soheil Mousavi Ajarostaghi, Sebastien Poncet
Summary: This study investigates the heat transfer process in a solar air heater with innovative arc shaped ribs and analyzes the influences of rib cross section, inter-rib distance, aspect ratio, and pitch on thermal efficiency. Results show that ribs with quadrangular cross section exhibit the best performance.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2021)
Article
Thermodynamics
Ke Zhao, Wei Lin, Xueying Li, Jing Ren
Summary: The study evaluates turbulent flow heat transfer and pressure loss in a channel with different rib heights using numerical simulation and experimental research. Results show that heat transfer enhancement and reduced pressure loss can be achieved with changes in rib height, leading to better overall thermal performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Chemistry, Physical
Tsz Loong Tang, Hamidon Salleh, Muhammad Imran Sadiq, Mohd Anas Mohd Sabri, Meor Iqram Meor Ahmad, Wan Aizon W. Ghopa
Summary: Nanofluids have been intensively studied for their ability to greatly enhance heat transfer in jet impingement flows for improved cooling performance. However, there is a lack of research on the use of nanofluids in multiple jet impingements, both experimentally and numerically. Therefore, further investigation is needed to understand the advantages and limitations of using nanofluids in this type of cooling system. An experimental and numerical study was conducted to analyze the flow structure and heat transfer behavior of multiple jet impingement using MgO-water nanofluids with a 3x3 inline jet array.
Article
Thermodynamics
Huaqiang Chu, Xinyu Yu, Hantao Jiang, Dongdong Wang, Nian Xu
Summary: This paper reviews the enhancement of pool boiling heat transfer through regular surface structure modification. The results show that structured surfaces with different scales can improve the pool boiling heat transfer performance compared to smooth surfaces.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Jing He, Jianghong Wu, Hangye Zhang, Yaokang Zhang, Biwang Lu
Summary: This study investigates a three-dimensional solid-state magnetic refrigerator based on micro-unit regeneration cycle and Peltier elements, and verifies the reliability of the model with experimental data. The comparison of heat transfer processes and performance characteristics under different configurations reveals that coupling with Peltier elements increases temperature span and frequency, while the parallel-plate heat transfer structure of the magnetocaloric material lattice enhances system performance.
APPLIED THERMAL ENGINEERING
(2021)
Article
Engineering, Chemical
Jianyang Zhou, Xiaoping Luo, Bolin He, Changzheng Li, Lizhe Liang, Zhixin Yin, Zhi Qun Tian
Summary: In this study, graphene was found to significantly enhance the heat transfer performance of nanofluids in minichannel heat sinks. Through a comprehensive evaluation method, the optimal graphene mass concentration and heat transfer coefficient were identified to achieve minimum energy consumption. The results suggest that the evaluation method has good universal applicability for assessing the heat transfer performance of minichannel heat sinks.
Article
Construction & Building Technology
Zhiguang Zhao, Xiaoling Qu, Jun Pang, Xingshuo Yang, Haoxiang Wen, Chaocheng Yu, Changqing Chen, Changan Tian, Zaibo Li, Sanyin Zhao
Summary: In this study, a numerical approach was proposed for simulating the pore structure and heat transfer behavior in porous concrete. The pore structure was reconstructed using a random distribution method based on the porosity and log-normal pore size distribution parameters. The effect of various structural parameters on the heat transfer behavior was systematically studied using a Finite Volume Model, and the numerical results agreed well with experimental data and existing models.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Shang-Pang Yu, Yeou-Feng Lue, Tun-Ping Teng, Hsiang-Kai Hsieh, Chia-Cing Huang
Summary: The wet ball milling method was used to prepare different concentrations of carbon-based nanofluids, and it was found that the 0.05 wt% CBNFs exhibited the best overall system performance in heat exchange experiments.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Chemical
Ri Zhang, Shasha Zhang, Mengyan Ding
Summary: A thin liquid film method is proposed to evaluate sand erosion in annular flow. This method considers the direct interaction between the liquid film and gas core, as well as the entrainment and deposition of droplets. The erosion rate is calculated by considering the effects of liquid entrainment and particle velocity decay. The method is fully verified by comparing with experimental data.
Article
Engineering, Chemical
Yu Suo, Xianheng Su, Wenyuan He, Xiaofei Fu, Zhejun Pan
Summary: This research investigates the mechanical properties of sandstone-shale composite through orthogonal experimental method and discrete element simulation. The results show that different lithologies and thickness ratios can affect the strength and fracture mode of the composite rock samples.
Article
Engineering, Chemical
Maurizio Troiano, Andrea El Hassanin, Roberto Solimene, Alessia Teresa Silvestri, Fabrizio Scala, Antonino Squillace, Piero Salatino
Summary: This study investigates the potential of Fluidized Bed Finishing (FBF) for square flat AlSi10Mg specimens manufactured via Laser-Powder Bed Fusion (L-PBF) additive manufacturing technology. The results show that good finishing can be achieved using rotation-assisted tests, with a maximum reduction of surface roughness by 67%. Steel particles are found to be the most effective bed material.
Review
Engineering, Chemical
Ningbo Song, Wanzhong Yin, Jin Yao
Summary: Seawater's dissolved salts and minerals have various effects on the flotation process, including influencing the characteristics and behavior of flotation factors, as well as affecting the surface of sulfide minerals. In most cases, seawater has adverse effects on the flotation of sulfide minerals, but these effects can be mitigated by adjusting the reagents.
Article
Engineering, Chemical
Kaiqiao Wu, Shuxian Jiang, Victor Francia, Marc-Olivier Coppens
Summary: In rectangular and cylindrical annular fluidized beds, pulsating gas flow can create regular bubble patterns, overcoming challenges seen in conventional units. This study provides new opportunities for modularization of fluidized bed operations.
Article
Engineering, Chemical
Shuo Li, Huili Zhang, Jan Baeyens, Miao Yang, Zehao Li, Yimin Deng
Summary: The paper assesses the behavior of cohesive Geldart C-type particles when fluidized by air with the aid of vibration. It determines that mechanical vibration is a simple and effective method to improve the fluidity of cohesive particles during fluidization.
Article
Engineering, Chemical
Zhenfei Feng, Qingyuan Zhang, Shanpan Liang, Zhenzhou Li, Fangwen Guo, Jinxin Zhang, Ding Yuan
Summary: A new micro/mini-channel heat sink (MCHS) with a combined structure of longitudinal and transverse vortex generators is designed, using Al2O3 nanofluid as the working medium. The study explores the effects of transverse vortex generator shape and longitudinal vortex generator angle on the hydraulic and thermal characteristics, comprehensive performance, entropy generation, and exergy efficiency. The results show that the triangular transverse vortex generator improves the comprehensive performance and exergy efficiency. Combined with the longitudinal vortex generator, the MCHS achieves the best comprehensive performance, entropy generation, and exergy efficiency when the Reynolds number is 742.
Article
Engineering, Chemical
Kostas Giannis, Christoph Thon, Guoqing Yang, Arno Kwade, Carsten Schilde
Summary: This study presents a 3D convolutional neural network (3D-CNN) methodology for generating realistic 3D models of particles. The method trains on 2D projections of particle images to predict their 3D shapes, and evaluates the accuracy of the predictions using Fourier shape descriptors (FSDs). This methodology has wide applications in particle shape analysis.
Article
Engineering, Chemical
Zheng-qing Zhou, Lu-jia Chai, Yu-long Zhang, Ya-bin Wang, Ze-chen Du, Tian-yi Wang, Yu-zhe Liu
Summary: The dynamic oxidation and shell-breaking processes of aluminum nanoparticles (ANPs) during heating were studied using in situ transmission electron microscopy. The results revealed that the changes in shell thickness can be divided into three stages, and the active aluminum content of ANP decreased before shell-breaking.
Article
Engineering, Chemical
Fulei Chen, Huaqing Ma, Zihan Liu, Lianyong Zhou, Yongzhi Zhao
Summary: A particle breakage model based on the particle replacement scheme, using the polyhedral model to describe particles, is proposed in this work to accurately describe the breakage of a large number of particles. Additionally, a fast-cutting algorithm is proposed to reproduce the size distribution of progeny particles determined by the breakage model. The validation and simulation results show satisfactory accuracy, efficiency, and stability of the algorithm.
Review
Engineering, Chemical
Matteo Errigo, Christopher Windows-Yule, Massimiliano Materazzi, Dominik Werner, Paola Lettieri
Summary: Gas-solid fluidized-bed systems have advantages in terms of chemical reaction efficiency and temperature control, making them widely used in industrial applications. However, the design, scale-up, and optimization of these complex units are limited by the lack of deep physical understanding. Non-invasive and non-intrusive diagnostic techniques provide a way for researchers to study these systems without affecting the flow field or directly contacting the medium under study.
Article
Engineering, Chemical
Saeed Fateh, Mohammad Behshad Shafii, Mohammad Najafi, Cyrus Aghanajafi
Summary: Applying a magnetic field to ferrofluids alters their flow characteristics and enhances heat transfer. Through visualization and quantitative investigation, it is found that the magnetic field influences the flow patterns and velocity profiles, improving fluid mixing and vorticity magnitude.
Article
Engineering, Chemical
Lei Gao, Bingbing Wei, Xiaochuan Hu, Zaifeng Yao, Yiwen Fang, Xuejian Gao
Summary: In this study, a numerical model of sand triaxial test was established using discrete element software PFC3D, and an indoor triaxial test was conducted to calibrate the numerical model. The influence of microscopic parameters on the macroscopic mechanical response of sand was analyzed. The results showed that the friction coefficient had the greatest impact on the peak strength and residual strength of the sand's stress-strain curve, and it was positively correlated. The normal tangential stiffness ratio was negatively correlated, while the porosity and boundary flexibility stiffness had minimal influence on it.
Article
Engineering, Chemical
Xuan Liu, Jie Gong, Kai Jiang, Xiaojuan Lai, Yu Tian, Kang Zhang
Summary: This study aimed to improve the performance of lignite coal water slurries (CWSs) by synthesizing a series of three-arm amphiphilic block copolymers. By controlling the relative molecular weight, hydrophilic/hydrophobic ratio, and ionic group content, the apparent viscosity of CWSs was significantly reduced and the static stability was improved. Thermogravimetric testing and XPS analysis were conducted to reveal the mechanism behind the improved performance.
Article
Engineering, Chemical
Lanka Dinushke Weerasiri, Daniel Fabijanic, Subrat Das
Summary: Fluidization at low pressure offers significant benefits for the fine chemical industry. This study investigates the behavior of bubbles and bed expansion under low pressure conditions. It is found that lower pressure leads to larger bubbles, increased bubble quantity, and higher aspect ratio. The predictability is affected by the inhomogeneous fluidization, but low pressure fluidization can generate similar bubble sizes with lower fluidizing mass compared to atmospheric pressure.