Article
Nanoscience & Nanotechnology
Junsheng Hou, Junjie Wu, Hongqiang Chen, Lei Huang, Li Ma, Xiong Zhao, Zihan Ding, Yonghai Zhang, Jiabin Fang, Jinjia Wei, Satoshi Watanabe, Nanjing Hao
Summary: A facile microfluidic synthesis strategy is developed to prepare highly stable and size-controllable silica nanofluids, enhancing the heat transfer efficiency and providing new insights for the rational design of two-phase cooling nano-systems.
MATERIALS TODAY NANO
(2023)
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
Nesakumar Dharmakkan, Periasamy Manikandan Srinivasan, Suresh Muthusamy, Amit Jomde, Sonal Shamkuwar, Chandrakant Sonawane, Kamal Sharma, Ali Jawad Alrubaie, A. S. El Shafay, Hitesh Panchal
Summary: This research analyzed the performance of a microplate heat exchanger using hybrid nanofluids and evaluated the convective heat transfer coefficient in terms of Nusselt number. The results showed that the thermal conductivity and overall heat transfer coefficient were enhanced better with hybrid nanofluids compared to nanofluids. The maximum thermal conductivity ratio between the hybrid nanofluid and base fluid was 2.10. The hybrid (TiO2-ZnO/ethylene glycol) achieved a maximum Nusselt number of 35.8 at 50 degrees C and a volume fraction of 4%.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Engineering, Chemical
Xu Ma, Yindong Song, Yang Wang, Shouguang Yao, Kambiz Vafai
Summary: In this study, novel hybrid nanoparticles were prepared using Ag modified functionalized GNP, and the boiling heat transfer properties of the nanofluids were investigated. The GNP-Ag hybrid nanofluids with a weight concentration of 0.001% exhibited the best heat transfer performance, with improved structural modification and wetting properties playing a crucial role in enhancing the heat transfer.
Article
Engineering, Multidisciplinary
R. Prasanna Shankara, N. R. Banapurmath, Abhinandan D'Souza, A. M. Sajjan, N. H. Ayachit, T. M. Yunus Khan, Irfan Anjum Badruddin, Sarfaraz Kamangar
Summary: Recent studies have shown that nanofluids have the potential to enhance the heat transfer properties of coolants in car radiators. By combining ethylene glycol and deionized water with graphene oxide nanoparticles, the heat transfer characteristics of the nanofluids were experimentally investigated. The optimized combination of 60% ethylene glycol, 40% deionized water, and 0.1 wt% graphene oxide exhibited higher heat transfer characteristics and showed potential for reducing frontal area and improving fuel efficiency in industrial design.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Xu Ma, Yindong Song, Yang Wang, Yuni Zhang, Jingya Xu, Shouguang Yao, Kambiz Vafai
Summary: This study focuses on functionalizing graphene nanoplatelets to improve hydrophobicity while maintaining good thermal properties, and preparing hybrid nanofluids for enhanced heat transfer. Novel GNP-Fe3O4 hybrid nanoparticles with high purity and hydrophilic functional groups were prepared. The addition of metal or non-metal nanoparticles improved the heat transfer characteristics of nanofluids. Experimental results showed significant enhancement in heat transfer properties compared to deionized water, with GNP-Fe3O4 + Al2O3 and GNP-Fe3O4 + SiO2 hybrid nanofluids exhibiting the best heat transfer effects.
Article
Thermodynamics
Alessandro d'Adamo, Martino Diana, Giuseppe Corda, Antonio Cucurachi, Maria Cannio, Andrea Pellacani, Marcello Romagnoli, Enrico Stalio, Paolo E. Santangelo
Summary: The demand for innovative propulsion technologies in the mobility sector is increasing the burden on thermal management. Nanofluids have emerged as a promising solution to replace traditional coolants. However, assessing their effectiveness in terms of heat transfer enhancement and required pumping power in various flow regimes remains a challenge. An experiment comparing a conventional coolant and a TiO2-based nanofluid was conducted, and a model was developed to evaluate their performance. The model highlights the laminar flow regime as promising for the use of nanofluids and provides criteria for quantitative evaluation.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
C. Nwaokocha, M. Momin, S. Giwa, M. Sharifpur, S. M. S. Murshed, J. P. Meyer
Summary: This study experimentally investigated the thermo-convection behavior of binary nanofluids as thermal working fluids and observed the effects of temperature gradient and hybrid nanoparticle proportion on the thermoconvection performance.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2022)
Article
Thermodynamics
Kashif Ali Abro, Mehwish Soomro, Abdon Atangana, J. F. Gomez-Aguilar
Summary: This paper presents a comparative analysis of the thermophysical properties of Maxwell nanofluid using modern approaches of fractional differentiations. The study reveals that the thermal conductivity of Maxwell nanofluid increases with an increase in the volume fraction of nanoparticles.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Chemistry, Multidisciplinary
Eun Min Go, Eunhye Shin, Changil Son, Jiseok Lee, JinHyeok Cha, Sang Kyu Kwak
Summary: The role of nanoparticles in improving heat transfer of nanofluids was investigated using a nanopipe model system. Nanofluids containing hydrophobic and hydrophilic functionalized graphene flakes were compared. The formation of a graphene-flake concentrated layer near the pipe wall induced a high heat transfer coefficient (HTC) in the nanofluids. The thermal boundary layer and HTC were thicker and higher when using carboxylated graphene flakes, which were more soluble in the coolant.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Thermodynamics
Asif Khan, Muddassir Ali
Summary: The hydraulic and thermal performances of alumina-silica/water hybrid nanofluid in a minichannel heat sink are experimentally investigated. The hybrid nanofluid enhances heat transfer and pressure drop, with heating power having a significant effect on the performance.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Pai Wang, Minxia Li, Qifan Wang, Baomin Dai, Yitai Ma, Hua Tian
Summary: In this study, the condensation heat transfer characteristics of the CO2/R32 mixture in a mini-channel with a diameter of 2 mm were investigated. The results showed that the convective heat transfer coefficient decreased with an increase in CO2 content, and the minimum value was obtained at approximately 55% CO2 content. Higher vapor quality and mass flow rate conditions corresponded to higher convective heat transfer coefficients. The prediction correlations and friction pressure drop correlations for CO2/R32 were analyzed, and the Kim and Mudawar correlations were recommended. This study provides theoretical support for analyzing the condensation heat transfer mechanism of a CO2/R32 mini-channel.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Energy & Fuels
Yu Qiao, Wen Sheng, Chen He, Changhui Liu, Zhonghao Rao
Summary: The study found that nonionic surfactants showed the best performance in terms of static stability, and that graphene-filled nanofluids demonstrated enhanced thermal conductivity, leading to a 27% increase in heat transfer coefficient.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
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
Physics, Multidisciplinary
Cagatay Yildiz, Cagatay Kaptan, Muslum Arici, Kasim Baynal, Hasan Karabay
Summary: This study numerically investigates the impacts of different nanofluids on heat transfer and pressure drop in an automotive radiator. The results show that nanofluid utilization can significantly improve heat transfer while also increasing pressure drop. The study also suggests the most appropriate nanofluid option for high heat transfer with relatively low pressure drop. Additionally, it concludes that using nanofluids can reduce radiator size and provide more space for placing other components.
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
(2022)
Article
Engineering, Chemical
Praveen Kumar Kanti, K. V. Sharma, Zafar Said, Mehdi Jamei, Kyathanahalli Marigowda Yashawantha
Summary: Experimental results show that the thermal conductivity of hybrid nanofluid increases with temperature and concentration, and a new calculation method is proposed. The use of MGGP and ANN methods for TC prediction demonstrates excellent predictive capabilities for both fly ash and hybrid nanofluid.
PARTICULATE SCIENCE AND TECHNOLOGY
(2022)
Article
Thermodynamics
I. A. Zakaria, W. A. N. W. Mohamed, N. H. A. Azid, M. A. Suhaimi, W. H. Azmi
Summary: This study experimentally obtained the correlation between heat transfer and electrical discharge rates of nanofluid coolants, and found that hybrid nanofluid coolants can improve cooling performance in fuel cell systems. The research results provide a more accurate assessment of nanofluid coolants for future applications.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
M. Z. Sharif, W. H. Azmi, N. N. M. Zawawi, M. F. Ghazali
Summary: This study investigates the performance of SiO2 and Al2O3 nanolubricants with R1234yf refrigerant in automotive air conditioning systems. SiO2 nanolubricant shows better cooling capacity, while Al2O3 nanolubricant improves the coefficient of performance and reduces power consumption. Further research on integrating these nanoparticles into refrigeration systems is encouraged.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
M. Z. Sharif, W. H. Azmi, M. F. Ghazali, N. N. M. Zawawi, H. M. Ali
Summary: This study focuses on improving the cycling of automotive air-conditioning (AAC) systems using hybrid nanolubricants and hydrofluoroolefin-1234yf refrigerant. A dynamic model for an AAC system with a thermostatic switch was developed based on the state-space model using fundamental conservation principles. Experimental data were used to validate the accuracy of the dynamic model, which showed a deviation within +/- 5%.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Mohd Farid Ismail, Wan Hamzah Azmi, Rizalman Mamat, Hafiz Muhammad Ali
Summary: This paper investigates the impact of nanoparticles on the thermal and tribological properties of lubricant base. Through four-ball tribology tests and thermal conductivity measurements, the results show that nanolubricants have excellent stability and an increase in nanoparticle concentration improves thermal conductivity. The optimum concentration of SiO2 and TiO2 nanoparticles can improve the thermal and tribological properties of PVE lubricant and offer an advantage when applied to refrigeration systems.
Article
Green & Sustainable Science & Technology
Kotturu V. V. Chnadra Mouli, L. Syam Sundar, A. M. Alklaibi, Zafar Said, K. V. Sharma, V. Punnaiah, Antonio C. M. Sousa
Summary: This paper experimentally analyzed the thermal efficiency, Nusselt number, exergy efficiency, thermal entropy generation, and frictional entropy generation of natural circulation of water-based multi-walled carbon nanotubes nanofluids flow in a flat plate collector. The results showed that the heat transfer coefficient, Nusselt number, and exergy efficiency increased gradually from 09:00 hr to a maximum value at 13:00 hr and then decreased gradually until the end of the test at 16:30 hr. Regression equations were developed for Nusselt number and friction factor for two time durations. At the peak value of 13:00 hr, the thermal and exergy efficiencies increased significantly compared to water.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2023)
Article
Engineering, Mechanical
Abdul Hamid Hamisa, Wan Hamzah Azmi, Mohd Farid Ismail, Rosminazuin Ab Rahim, Hafiz Muhammad Ali
Summary: The tribology properties of TiO2/POE, SiO2/POE, and TiO2-SiO2/POE nanolubricants were investigated for an automotive air-conditioning system with an electrically-driven compressor (EDC). The lowest coefficient of friction (COF) and wear scar diameter (WSD) were achieved at specific volume concentrations for each nanolubricant. Mono and hybrid nanolubricants with volume concentrations of less than 0.05% are recommended for use in air-conditioning systems with EDC due to their excellent tribology performances.
Article
Thermodynamics
N. N. M. Zawawi, W. H. Azmi, Z. A. A. Majid, R. A. Rahim, H. M. Ali
Summary: Due to the depletion of conventional energy sources, solar energy is being considered as a viable alternative, especially for water heating systems. This study demonstrates the use of hybrid nanofluids in heating systems to improve the thermal performance of multilayer absorber solar collectors. The SiO2-TiO2 hybrid nanofluids at volume concentrations up to 2.0% were tested and showed significant improvements in temperature difference, efficiency, and fluid temperature in the solar collector.
BUILDING SIMULATION
(2023)
Article
Green & Sustainable Science & Technology
Sanjay Khan, K. Sudhakar, Mohd Hazwan Bin Yusof, W. H. Azmi, Hafiz Muhammad Ali
Summary: The residential building and transportation sectors have gained attention due to carbon emissions impacting human lives. Electric vehicles are expected to reduce reliance on non-renewable fuels and the environmental impact of transportation. Building integrated Photovoltaics (BIPV) can decrease energy requirements and contribute to sustainability.
ENERGY FOR SUSTAINABLE DEVELOPMENT
(2023)
Article
Engineering, Mechanical
Mohd Zaki Sharif, Wan Hamzah Azmi, Mohd Fairusham Ghazali, Nurul Nadia Mohd Zawawi, Hafiz Muhammad Ali
Summary: In the field of sustainable tribology, researchers are studying the incorporation of nanoparticles into lubricants to enhance tribological performance. However, this approach may lead to increased lubricant viscosity. This study aimed to evaluate the impact of nanoparticles on the viscosity and coefficient of friction (COF) of nanolubricants. Different types of nanolubricants were synthesized and their viscosity and COF were measured. The results showed that the combination of nanoparticles, temperature, and volume concentration significantly influenced the viscosity and COF of nanolubricants.
Article
Engineering, Mechanical
Mohd Farid Ismail, Wan Hamzah Azmi, Rizalman Mamat, Korada Viswanatha Sharma, Hafiz Muhammad Ali
Summary: Proper preparation and stability evaluation of nanolubricant are crucial in the application of nanoparticle dispersion technique in a two-phase system. The stability of nanolubricant ensures maximum benefit from nanoparticle dispersion in specified Polyvinyl ether (PVE). In this study, TiO2/PVE nanolubricant was prepared using two physical homogenization methods: high-speed homogenizer (HSH) and ultrasonication bath. The stability of the nanolubricant was evaluated using various techniques, and results showed that ultrasonication homogenizing methods had better stability with a zeta potential of over 60 mV.
Article
Engineering, Mechanical
Nur Syahilia Syahira Safie, Muhamad Nasir Murad, Tan Chye Lih, Azwan Iskandar Azmi, Wan Azmi Wan Hamzah, Mohd Danish
Summary: Metal cutting fluids have adverse effects on humans and the environment. This study explores the performance of non-edible vegetable oils as eco-friendly alternatives. The results show that castor oil performs the best in reducing tool wear and extending tool life, making it a suitable option for a cleaner machining environment.
Proceedings Paper
Materials Science, Multidisciplinary
Anwar Ilmar Ramadhan, Wan Hamzah Azmi
Summary: In recent research, the focus has been on improving the thermo-physical properties of single-component nanofluids, but now there is a development of hybrid nanofluids to enhance heat transfer. This study investigated the dynamic viscosity of Al2O3-TiO2-SiO2 nanoparticles in different composition ratios and found that the mixing ratio of CR 3 (20:64:16) had the lowest relative viscosity. The three distinct nanoparticles in the mixing ratio were identified as the control and performance factors in this study.
MATERIALS TODAY-PROCEEDINGS
(2022)
