Article
Energy & Fuels
Syed Nadeem Abbas Shah, Syed Shahabuddin, Mohd Faizul Mohd Sabri, Mohd Faiz Mohd Salleh, Suhana Mohd Said, Khaled Mohamed Khedher
Summary: The study successfully obtained polyaniline nanocomposite-based nanofluids through a two-step method, with tungsten disulphide nanoparticles doped in PANI. Comprehensive characterization and thermal property analysis confirmed the significant improvement in thermal conductivity and viscosity reduction of the formulated nanofluids, highlighting the crucial role of WS2 doping within PANI matrix.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Review
Materials Science, Ceramics
Ghassan Fadhil Smaisim, Doaa Basim Mohammed, Ahmed M. Abdulhadi, Khusniddin Fakhriddinovich Uktamov, Forat H. Alsultany, Samar Emad Izzat, Mohammad Javed Ansari, Hamzah H. Kzar, Moaed E. Al-Gazally, Ehsan Kianfar
Summary: Nanofluids are liquid suspensions of hard nanometer-sized particles suspended in a base fluid. Hybrid nanofluids, which consist of two distinct forms of nanoparticles diffused in base fluids, display strong heat transfer efficiency and have a wide range of thermal applications.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2022)
Article
Thermodynamics
G. Sriharan, S. Harikrishnan, S. Kalaiselvam, Hakan F. Oztop, Nidal Abu-Hamdeh
Summary: An experimental investigation was conducted on the heat transfer characteristics of nanofluids passing through a mini hexagonal tube heat sink. It was found that CuO-EG nanofluid exhibited the highest thermal conductivity and heat transfer coefficient. Increasing the concentration of nanoparticles in EG improved the thermal conductivity of nanofluids. Stable dispersion of nanoparticles in EG resulted in enhanced heat transfer coefficient under turbulent flow conditions.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
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
Thermodynamics
Chai Meijuan
Summary: This study conducts a thorough analysis of the use of intelligent methods in modeling the thermal conductivity of nanofluids. It is found that artificial neural networks provide more detailed predictions compared to statistical correlations, with accuracy being correlated to factors such as structure, functions, input variables, and algorithms. The trial-and-error process is used to determine the optimal configuration of neural networks, considering all variables influencing the precision of nanofluids.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
Mohammad Hemmat Esfe, Mousa Rejvani, Davood Toghraie
Summary: The article discusses the efficiency of nanofluids and the thermal performance factor, using Artificial Neural Networks for modeling and predicting experimental data. The results show that ANN has better agreement with experimental data in estimating data at high Reynolds numbers.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Gyuchang Kim, Seungyeop Baek, Wontak Choi, Ajeong Lee, Seunghyeon Lee, Hyomin Jeong, Yonmo Sung
Summary: This study found that 0.5 wt% Al2O3 nanofluids exhibit good dispersibility, while the addition of Al2O3 increases the fluid's surface tension and thermal conductivity.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Nanoscience & Nanotechnology
Saeed Rahman Salari, Maryam Khavarpour, Mojtaba Masoumi, Saba Mosivand
Summary: Nanofluids, a new generation of heat transfer fluids, face challenges in terms of nanoparticle stability in base liquids. In this study, cobalt oxide (Co3O4) and tin dioxide (SnO2) nanoparticles were successfully synthesized and dispersed in base fluid using surfactants, acidity changes, and ultrasonic vibration. The highest stability of SnO2 and Co3O4 nanofluids was observed at pH values of 7.5 and 8, respectively. Ultrasonication time also played a crucial role in improving particle dispersion. The thermophysical properties of nanofluids were investigated under different particle concentrations and temperatures, showing that density and viscosity decrease with temperature increase and particle mass fraction decrease, while specific heat capacity increases with temperature. Moreover, the thermal conductivity of nanofluids increases non-linearly with mass fraction and temperature, with maximum enhancements of 59% and 72.5% achieved for Co3O4 and SnO2 nanofluids, respectively.
MICROFLUIDICS AND NANOFLUIDICS
(2022)
Article
Thermodynamics
Tang Tsz Loong, Hamidon Salleh, Amir Khalid, Hasan Koten
Summary: This study analyzed the thermal performance of various metal oxide water based nanofluids by evaluating their experimental data. A performance factor was introduced to assess the thermal performance of nanofluids, and the enhancement of thermal conductivity and viscosity of different types of nanofluids were compared to rank their thermal performance.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Reinaldo R. Souza, Ines M. Goncalves, Raquel O. Rodrigues, Graca Minas, J. M. Miranda, Antonio L. N. Moreira, Rui Lima, Goncalo Coutinho, J. E. Pereira, Ana S. Moita
Summary: NFs are colloidal suspensions that enhance heat transfer capacity of fluids, with applications in various fields such as electronics cooling and renewable energies. Parameters like BF, NPs size, concentration, shape, and fabrication procedures impact the thermal properties of NFs. Models for predicting specific heat, viscosity, thermal conductivity, and density of NFs are listed and evaluated.
APPLIED THERMAL ENGINEERING
(2022)
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
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
Thermodynamics
Waqar Ahmed, S. N. Kazi, Z. Z. Chowdhury, M. R. B. Johan, Naveed Akram, M. A. Mujtaba, M. Gul, C. S. Oon
Summary: The study examined the thermophysical properties and convective heat transfer characteristics of ZnO@TiO2/DW binary composite nanofluids with different concentrations. Results showed a significant enhancement in thermal conductivity and convective heat transfer, especially at 0.1% mass concentration.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Chemistry, Multidisciplinary
Glauco Nobrega, Reinaldo Rodrigues de Souza, Ines M. Goncalves, Ana S. Moita, Joao E. Ribeiro, Rui A. Lima
Summary: This review highlights the recent progress made in the use of nanofluids (NFs) in machining, solar energy, and biomedical engineering, focusing on their thermal and stability properties. NFs play a significant role in optimizing machining processes, thermal management of solar panels, and various biomedical applications. The review also identifies and discusses key parameters that have influenced the use of these fluids in different fields.
APPLIED SCIENCES-BASEL
(2022)
Review
Chemistry, Multidisciplinary
Xiaoyin Li, Fangyang Yuan, Wenma Tian, Chenlong Dai, Xinjun Yang, Dongxiang Wang, Jiyun Du, Wei Yu, Huixin Yuan
Summary: This article reviews the heat transfer enhancement of nanofluids with non-spherical nanoparticles. The authors categorized the non-spherical nanoparticles into three types based on their geometric structures and evaluated their effects on the thermal conductivity and convective heat transfer of nanofluids using experimental data. The research found that non-spherical nanoparticles with large aspect ratios, such as carbon nanotubes/nanofibers/nanowires, exhibited abnormally enhanced thermal conductivity. The enhancement effect on thermal conductivity was approximately 4.5:2.5:1 for the three types of non-spherical nanoparticles. Non-spherical nanoparticles with small aspect ratios, such as nanorods/ellipsoids, showed larger enhancement in thermal conductivity per concentration. The convective heat transfer coefficient was increased by suspending non-spherical nanoparticles in the base fluid, but no significant thermohydraulic performance was observed, particularly for turbulent flows, due to increased pumping power.
APPLIED SCIENCES-BASEL
(2022)
Article
Thermodynamics
Sofia Polychroniadou, Konstantinos D. Antoniadis, Marc J. Assael, Ian H. Bell
Summary: In this study, a new correlation for the viscosity of krypton is presented, based on the entropy scaling approach. The correlation has low uncertainty and is valid for different temperature ranges and pressure limits of krypton.
INTERNATIONAL JOURNAL OF THERMOPHYSICS
(2022)
Article
Thermodynamics
Richard A. Perkins, Marcia L. Huber, Marc J. Assael
Summary: New experimental data for the thermal conductivity of 1,1,1,2,2,3,3-heptafluoro-3-methoxypropane (RE-347mcc, HFE-7000) in vapor, liquid, and supercritical states were reported. A wide-range correlation for the thermal conductivity in different states was developed based on these data. The uncertainty of the experimental data varied with density, pressure, and temperature, with larger uncertainties in the critical region.
INTERNATIONAL JOURNAL OF THERMOPHYSICS
(2022)
Article
Thermodynamics
Danai Velliadou, Konstantinos D. Antoniadis, Marc J. Assael, Marcia L. Huber
Summary: A new correlation for the viscosity of propylene glycol is presented in this study, which is based on critically evaluated experimental data. The correlation is designed to be used with an existing equation of state and is applicable in the temperature range of 243 K to 452 K and pressures up to 245 MPa. The estimated uncertainty is 4.5% at the 95% confidence level, except in the dilute-gas region where no measurements are available for comparison. Care should be taken when extrapolating the correlation outside the validated range.
INTERNATIONAL JOURNAL OF THERMOPHYSICS
(2022)
Article
Thermodynamics
Danai Velliadou, Marc J. Assael, Marcia L. Huber
Summary: A new wide-ranging correlation for the viscosity of 1,1,1,2-tetrafluoroethane (R-134a) is presented based on critically evaluated experimental data, with low uncertainty in a certain range of temperature and pressure, and maintaining physical reasonability at pressures above 70 MPa. However, caution should be exercised when using the correlation outside of the validated range of the equation of state.
INTERNATIONAL JOURNAL OF THERMOPHYSICS
(2022)
Article
Chemistry, Multidisciplinary
M. L. Huber, R. A. Perkins, M. J. Assael, S. A. Monogenidou, R. Hellmann, J. V. Sengers
Summary: This manuscript describes the development and adoption of new formulations for the thermal conductivity of heavy water by the International Association for the Properties of Water and Steam. The 2021 formulation incorporates critical enhancement and has a broader range of applicability compared to the previous formulation.
JOURNAL OF PHYSICAL AND CHEMICAL REFERENCE DATA
(2022)
Correction
Thermodynamics
Sofia Sotiriadou, Eleftheria Ntonti, Danai Velliadou, Konstantinos D. Antoniadis, Marc J. Assael, Marcia L. Huber
INTERNATIONAL JOURNAL OF THERMOPHYSICS
(2023)
Article
Thermodynamics
Sofia Sotiriadou, Eleftheria Ntonti, Danai Velliadou, Konstantinos D. D. Antoniadis, Marc J. J. Assael, Marcia L. L. Huber
Summary: We have developed a correlation for the viscosity of ethanol based on experimental data. It can be used in a wide temperature and pressure range, and has estimated uncertainties of 4.2% for the liquid and supercritical phase and 2% for the gas phase. Additionally, we propose another correlation for viscosity calculations at 0.1 MPa with an uncertainty of 2.3%.
INTERNATIONAL JOURNAL OF THERMOPHYSICS
(2023)
Article
Energy & Fuels
Laura Fedele, Sergio Bobbo, Davide Menegazzo, Michele De Carli, Laura Carnieletto, Fabio Poletto, Andrea Tarabotti, Dimitris Mendrinos, Giulia Mezzasalma, Adriana Bernardi
Summary: The European building sector accounts for 40% of total energy consumption and 36% of greenhouse gas emissions. The European Commission is actively seeking technological solutions to reduce energy consumption and greenhouse gas emissions, with ground source heat pumps being of particular interest. This paper presents the results of an analysis on the performance of geothermal heat pumps using low-GWP refrigerants as alternatives to R134a and R410A.
Article
Thermodynamics
L. Fedele, G. Lombardo, I. Greselin, D. Menegazzo, S. Bobbo
Summary: In recent decades, the HVAC&R industry has been striving to find environmentally friendly refrigerants. However, the availability of low GWP fluids, particularly HFOs, is limited. There is still a lack of comprehensive knowledge about the thermophysical properties of HFOs, especially for blends, which necessitates further research.
INTERNATIONAL JOURNAL OF THERMOPHYSICS
(2023)
Article
Thermodynamics
Marc J. Assael, Konstantinos D. Antoniadis, Danai Velliadou, William A. Wakeham
Summary: This paper provides a summary of the necessary conditions for accurate measurement of fluid thermal conductivity using the transient hot-wire technique. The paper presents a prescription for implementing the method, based on its development over five decades. It demonstrates that transient hot-wire instruments can achieve thermal conductivity measurements with the smallest uncertainty to date (+/- 0.2%).
INTERNATIONAL JOURNAL OF THERMOPHYSICS
(2023)
Correction
Thermodynamics
Danai Velliadou, Katerina A. Tasidou, Konstantinos D. Antoniadis, Marc J. Assael, Richard A. Perkins, Marcia L. Huber
INTERNATIONAL JOURNAL OF THERMOPHYSICS
(2023)
Article
Thermodynamics
Sofia Sotiriadou, Eleftheria Ntonti, Marc J. J. Assael, Marcia L. L. Huber
Summary: This paper presents new correlations for the viscosity and thermal conductivity of 1-hexene based on experimental data. The viscosity correlation is valid from the triple point to 580 K and up to 245 MPa pressure, while the thermal conductivity is valid from the triple point to 620 K and 200 MPa pressure. The correlations can be used with a recently published equation of state. The estimated uncertainties for viscosity and thermal conductivity are provided.
INTERNATIONAL JOURNAL OF THERMOPHYSICS
(2023)
Article
Thermodynamics
Danai Velliadou, Konstantinos D. Antoniadis, Andreana N. Assimopoulou, Marc J. Assael, Maria Carolina Margarido Sequeira, William A. Wakeham
Summary: New measurements of the thermal conductivity of n-docosane, n-tetracosane, 1,6-hexanediol, and 1,8-octanediol in both solid and liquid phases were conducted using the transient hot-wire technique. The technique is absolute and has an uncertainty of 1%. The standard deviations of the thermal conductivity measurements were determined for each substance in different temperature ranges.
INTERNATIONAL JOURNAL OF THERMOPHYSICS
(2023)
Article
Chemistry, Physical
Filippo Agresti, David Cabaleiro, Laura Fedele, Stefano Rossi, Simona Barison
Summary: PCM emulsions or micro-nano-encapsulated into organic and inorganic shells have been studied to enhance the thermal capacity and efficiency of heat transfer liquids. In this work, RT21HC, a commercial PCM, was successfully nano-encapsulated into PMMA shells to obtain stable colloidal dispersions. The colloidal dispersions were characterized for microstructure, colloidal stability, rheological properties, heat capacity, and thermal diffusivity. The effect of incorporating nucleating agents into the nano-capsules to mitigate PCM crystallization supercooling was also investigated.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Physics, Fluids & Plasmas
David Cabaleiro, Sonia Losada-Barreiro, Filippo Agresti, Carolina Hermida-Merino, Laura Fedele, Luis Lugo, Simona Barison, Manuel M. Pineiro
Summary: This study focuses on preparing and characterizing phase change material nanoemulsions as thermal fluids with latent functionality. The results show that the formulated nanoemulsions have good stability and thermal reliability, effectively reducing subcooling and enhancing energy storage capacity.