Article
Nuclear Science & Technology
A. Brekis, I. Krastins, B. Perez Polo, J. Echeberria, K. Kravalis, O. Mikanovskis, A. Romancuks, E. Platacis, L. Buligins, C. Garcia-Rosales
Summary: This article describes experimental and numerical research conducted in a strong magnetic field to test silicon carbide (SiC) flow channel inserts (FCI) in lead-lithium (PbLi) liquid metal flow. The study aims to further develop the High-Temperature Dual-Coolant Lead-Lithium nuclear fusion blanket concept by testing new variations of SiC inserts under relevant electromagnetic conditions. The results show the impact of the inserts on hydraulic resistance and the distribution of electrical potential in the lead-lithium channel.
FUSION ENGINEERING AND DESIGN
(2023)
Article
Nuclear Science & Technology
Beatriz Perez, Asier Bergara, Arturs Bre, Marta Malo, Javier Garcia-Goikoetxea, Kalvis Kravalis, Teresa Hernandez, Jon Echeberria, Jose M. Martinez-Esnaola, Ernest Platacis, Carmen Garcia-Rosales
Summary: This paper studies the use of SiC-sandwich material for Flow Channel Inserts (FCIs) in the high temperature DCLL blanket concept, and the results show promising reductions in MHD pressure drop and compatibility between SiC and PbLi under high temperature and magnetic field conditions.
NUCLEAR MATERIALS AND ENERGY
(2022)
Article
Thermodynamics
Saeed Vahidifar, Seyedhadi Banihashemi
Summary: Researchers have conducted numerous studies on active and passive methods to improve thermal performance and increase heat transfer in internal flows. Different geometries and configurations of turbulators have been proposed for optimal performance in heat exchangers. However, there is limited research on turbulators with equal obstruction inside the tube and aerodynamic geometry. This study investigates the effect of stimulating the boundary layer of the internal flow on heat transfer and flow characteristics, using a pipe with ring-shaped turbulators and equal blocking area.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Review
Green & Sustainable Science & Technology
Mohamed H. Mousa, Nenad Miljkovic, Kashif Nawaz
Summary: Enhancing heat transfer between fluids and walls is crucial for improving performance. By utilizing features that enhance heat transfer, equipment size can be reduced, costs minimized, and safety risks mitigated.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Thermodynamics
Vahid Rajabi, Zohreh Mansoori, Hassan Rahimzadeh, Hamed Nasrfard, Goodarz Ahmadi
Summary: The experimental investigation focused on the HTC and pressure loss in horizontal smooth and wire-inserted tubes. Three different coiled wire inserts (CWIs) with varying lengths and thicknesses were studied. The results showed that the use of CWIs significantly improved the HTC compared to smooth tubes. New correlations were developed to accurately predict the condensation HTC in smooth and wire-inserted tubes.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Ramin Ranjbarzadeh, Alireza Akhgar, Roozbeh Taherialekouhi, Annunziata D'Orazio, S. Mohammad Sajadi, Ferial Ghaemi, Dumitru Baleanu
Summary: The study investigated the use of GO/water nanofluid as a coolant fluid in an isothermal heat transfer system. Various properties of the nanofluid were experimentally measured, showing a significant improvement in convection heat transfer coefficient, making it suitable as a coolant fluid in industrial systems.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
D. D. Ma, Y. X. Tang, G. D. Xia
Summary: The sinusoidal wavy microchannels with secondary channels (SWSC) show better heat removal performance in flow boiling studies compared to conventional microchannels, thanks to increased bubble nucleation induced by enlarged surface area and continuous development of thin liquid film due to the introduction of secondary channels. However, the SWSC microchannels suffer from a higher pressure drop penalty.
APPLIED THERMAL ENGINEERING
(2021)
Article
Chemistry, Physical
Sanghyun Nam, Dae Yeon Kim, Youngwoo Kim, Kyung Chun Kim
Summary: This study tested various metal foam insert configurations to reduce pressure drop while maintaining high heat transfer, and found that the fully filled metal foam channel offered the highest thermal performance, while the streamwise insert pattern model had the lowest heat transfer at a low mass flux.
Article
Thermodynamics
Yanhong Sun, Ao Huang, Jinli Lu, Yuyan Jiang
Summary: This study experimentally investigated the heat transfer characteristics and dynamic flow boiling instabilities of ethanol in a rectangular microchannel. The results showed that the inhibition of bubble nucleation caused by large bubbles in the confined space led to a deterioration in heat transfer performance. Higher mass flux resulted in more effective bubble nucleation and better heat transfer. The triggering of flow boiling instability in the microchannel was strongly dependent on quasi-periodical flow phenomenon and multiphase alternation. The thermophysical properties of the working liquid significantly affected the fluctuation amplitude.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Chinmaya Kumar Patra, Anandaroop Bhattacharya, Prasanta Kumar Das
Summary: A one-dimensional flow-boiling model is developed to study the pressure drop and heat transfer mechanism in a microchannel of rectangular cross-section under slug-flow regime. The model considers different stages of bubble growth and the periodic passage of different zones to evaluate the pressure drop and heat transfer coefficient. The results show that the channel dimension, flow velocity, heat flux, and working fluid properties have significant effects on the pressure drop and heat transfer coefficient.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Abdullah Al-Sharafi, Bekir S. Yilbas, H. Al-Qahtani, Ahmet Z. Sahin
Summary: This study investigates the influence of micro-post arrays and trapped air on velocity and temperature increase of the working fluid in microchannel flow. Experimental results show that micro-post arrays affect the flow field near the channel top wall, while air trapped between the arrays influences heat transfer rates. Additionally, increasing the pitch size of the arrays decreases the Nusselt number, increasing the microchannel height lowers the Nusselt number, and the pressure drop is significantly influenced by the arrays.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Mohammadreza Assari, Seyedhadi Banihashemi, Milad Setareh, Amir Mohammad Nargesi Motlagh
Summary: This research numerically investigated the heat transfer and thermal performance in a pipe with hollow and perforated spherical turbulators. The effect of aerodynamic turbulators with the same blockage percentage was studied for increasing heat transfer and reducing energy consumption. The best performance was obtained with an oval hole turbulator of 1.26. The Nusselt number ranged from 1.58 to 5.02, and the friction coefficient increased by 3.55 to 13.99 times compared to a plain pipe in the studied geometries. The highest thermal performance coefficient was obtained with DR = 0.85 and PI = 7%.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Multidisciplinary Sciences
Iman Kalani, Davood Toghraie
Summary: The study found that increasing Reynolds number leads to higher Nusselt number and lower friction factor. The presence of helically twisted tapes in the pipe enhances heat transfer efficiency.
SCIENTIFIC REPORTS
(2021)
Review
Green & Sustainable Science & Technology
Abdolvahab Ravanji, Ann Lee, Javad Mohammadpour, Shaokoon Cheng
Summary: Effective thermal management is crucial for device performance, product longevity, energy saving, environmental protection, and avoiding thermal failures. Pin fins are widely used for passive cooling and their optimization plays a significant role in improving flow structure, heat transfer, and minimizing pressure drops. This study critically reviews the literature on pin fins, explores their thermohydraulic performance, and provides valuable insights for the design of efficient cooling systems.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2023)
Article
Thermodynamics
Tran Dinh Manh, M. Marashi, Amir Mehdi Mofrad, Ali Hosseini Taleghani, Houman Babazadeh
Summary: This study investigates the use of tape with nanofluid to increase pressure drop and heat rate in heat exchangers. The efficiency of H2O-CuO nanofluid increases as Reynolds number increases, while the rate of exergy declines over 35% as the height ratio increases from 0.3 to 0.5.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)