Article
Thermodynamics
Xinfeng Zhai, Cong Qi, Yuqi Yang, Jiangyun Wang
Summary: The study investigates the effects of an adjustable magnetic field on the convective heat transfer performance and flow resistance coefficient of water-based Fe3O4 nanofluids under different Reynolds numbers. It was found that the convective heat transfer performance is directly related to the mass fraction, magnetic field strength, and pitch curvature ratio, with an increase in heat transfer efficiency observed with the use of ferrofluid and higher magnetic field strengths. Additionally, different pitch curvature ratios of spiral tubes also affect heat transfer performance.
APPLIED THERMAL ENGINEERING
(2021)
Article
Chemistry, Physical
Zihao Xuan, Yuling Zhai, Mingyan Ma, Yanhua Li, Hua Wang
Summary: The study experimentally investigated the thermi-economic performance of Al2O3-TiO2-Cu/water ternary hybrid nanofluid, finding that the optimum nanoparticle mixture ratio was 40:40:20 with highest thermal conductivity and lowest viscosity. Ternary hybrid nanofluids show strong potential for industrial heat transfer applications.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Engineering, Mechanical
Sourav Diwania, Anwar S. Siddiqui, Sanjay Agrawal, Rajeev Kumar
Summary: The study found that the Cu/water nanofluid outperformed the Al2O3/water nanofluid and pure water in terms of PVT performance. With a 2% volume concentration of Cu nanoparticles, there was a 4.98% and 5.23% increase in average electrical and thermal efficiencies, respectively. Furthermore, while tube diameter had minimal impact on performance, the thermo-electrical performance of the hybrid PVT collector significantly improved with the increase in the number of tubes.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2021)
Article
Energy & Fuels
Santosh Kumar Singh, Arun Kumar Tiwari, H. K. Paliwal
Summary: This study aims to enhance the performance of parabolic trough collectors (PTCs) used in various industrial applications. By using synthetic aromatic fluids with hybrid nanoparticles, the thermal efficiency and heat transfer in PTC systems can be improved. The findings of the study reveal significant enhancements in thermal efficiency and heat transfer coefficient using the hybrid nanofluid compared to the base fluids.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2023)
Review
Chemistry, Multidisciplinary
Yuwei Wang, Jie Yu, Cong Qi, Wenjie Zhang
Summary: In this paper, the thermophysical properties and thermo-hydraulic performance of nanofluids in microchannels are reviewed, and the methods to improve the heat dissipation capability of microchannel heat sinks are analyzed from both thermal and flow perspectives.
Review
Chemistry, Analytical
S. N. M. Zainon, W. H. Azmi
Summary: This paper discusses the importance of stability of nanofluids and various methods to improve it, emphasizing the impact of factors such as nanoparticle type, concentration, temperature, etc., on the thermo-physical properties of nanofluids.
Article
Engineering, Mechanical
Minjung Lee, Yunchan Shin, Honghyun Cho
Summary: The study found that MWCNT, CuO, and Fe3O4 nanofluids exhibit higher efficiency in solar collectors, and the use of binary nanofluids can further enhance efficiency, with MWCNT/CuO binary nanofluid showing the best performance.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2021)
Article
Energy & Fuels
Oyirwoth P. Abedigamba, Frank S. Mndeme, Ashmore Mawire, Indra Bahadur
Summary: Sensible heat storage materials, such as vegetable oils, are cheap and easily accessible, making them suitable for Sub-Saharan African countries. The physical properties of Sunflower oil and Roki oil were experimentally determined, and their thermal performance was compared. The results showed that Roki oil had higher heat utilization temperatures and thermal conductivity values compared to Sunflower oil.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
S. N. M. Zainon, W. H. Azmi
Summary: The study found that the green Bio-glycol based TiO2-SiO2 nanofluids exhibit good stability and enhanced thermal conductivity. However, there is minimal change in dynamic viscosity with temperature.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Multidisciplinary Sciences
Adela Svobodova-Sedlackova, Alejandro Calderon, Camila Barreneche, Pablo Gamallo, A. Ines Fernandez
Summary: This study analyzed nanofluids with different concentrations of SiO2 NPs using techniques such as infrared thermography, infrared spectroscopy, and differential scanning calorimetry to understand the mechanism behind the increase in heat capacity. Results showed that the clustering of NPs and ionic exchange processes contribute to the anomalous behavior of the heat capacity in nanofluids.
SCIENTIFIC REPORTS
(2021)
Article
Environmental Sciences
Poongavanam GaneshKumar, Duraiswamy Sakthivadivel, Rajendran Prabakaran, Shanmugarajan Vigneswaran, Manivannan SakthiPriya, Amrit Kumar Thakur, Ravishankar Sathyamurthy, Sung Chul Kim
Summary: This study developed a novel nanofluid using T-55 as heat transfer fluid and MWCNTs as dispersants, improving thermal conductivity and viscosity. The thermal efficiency increased with MWCNT volume concentration and temperature, showing favorable performance at high temperatures.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Thermodynamics
Duygu Yilmaz Aydin, Metin Guru
Summary: Nanofluids with better thermo-physical properties compared to conventional fluids are widely used in various systems. Studies on preparation techniques, stability improvement, and thermal performance evaluation are increasing. The use of nanofluids shows potential in enhancing heat transfer properties in thermal systems.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Engineering, Chemical
Farshad Farahbod
Summary: Efficiency of drilling fluids in heat transfer plays a crucial role in cooling the drill bit, changing the size of nanoparticles in drilling fluid components can enhance heat transfer rate.
Article
Thermodynamics
Navid Aslfattahi, R. Saidur, A. Arifutzzaman, A. S. Abdelrazik, L. Samylingam, Mohd Faizul Mohd Sabri, Nor Azwadi Che Sidik
Summary: In this research, a new hybrid graphene-silver nanomaterial was used with paraffin wax as a phase change material (PCM) to improve its thermo-physical properties. The thermal and electrical energy efficiencies of the synthesized nanocomposite (PCM/graphene-silver) were investigated in solar thermal collector systems. The results showed that the hybrid nanocomposite exhibited improved specific heat capacity, thermal conductivity, and energy efficiency compared to the pure PCM.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Engineering, Multidisciplinary
M. Farooq, M. Farhan, Gulzar Ahmad, Zia ul Rehman Tahir, M. Usman, M. Sultan, M. Saad Hanif, M. Imran, Saqib Anwar, Ahmed M. El-Sherbeeny, M. Ali Shakir
Summary: Due to rapid industrialization and urbanization, the increase in carbon emissions in the atmosphere and the depletion of fossil fuel and gas reserves have led to the search for alternative renewable energy resources. Solar energy is considered as one of the most promising sources. This study analyzes the effect of multiple working fluids on the efficiency of parabolic trough solar collectors (PTCs) using Computational Fluid Dynamics (CFD) analysis. Two types of nanofluids, Alumina and Copper-oxide, are used to evaluate the thermal efficiency of PTC through CFD simulations. The study also investigates the impact of absorber tube material and receiver tube length on the working fluid's temperature. The results suggest that nanofluids-based PTCs system shows promise for sustainable environmental applications.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
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.