Article
Thermodynamics
Zengkun Zhan, Lixia Chen, Hongna Zhang, Chuandong Lin, Sining Li, Xiaobin Li, Fengchen Li
Summary: This research proposes a new technique for heat transfer enhancement using viscoelastic fluid pulsating laminar flow (VPL flow). Numerical studies and flow performance analysis show that VPL flow significantly improves the overall heat transfer performance, with optimal enhancement achieved at pulsation frequencies close to the characteristic frequency of the viscoelastic fluid flow.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Javad Mohammadpour, Fatemeh Salehi, Ann Lee, Luca Brandt
Summary: This study focuses on the innovative integration of different cooling techniques to maximize the thermal performance in a 3D microchannel heat sink (MCHS). The effect of particle concentration, orifice spacing, orifice height, oscillation frequency, membrane amplitude, and phase actuation on convective and conductive heat transfer is analyzed. In terms of thermal performance, 180 out-of-phase cases show a higher figure of merit (FOM) than in-phase SJs. Increasing the frequency and amplitude enhances the heat transfer.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
G. Marseglia, M. G. De Giorgi, P. Pontes, R. Solipa, R. R. Souza, A. L. N. Moreira, A. S. Moita
Summary: This paper investigates the advantages and challenges of two-phase flows, specifically flow boiling of pure liquids and nanofluids, for cooling microchannel heat sinks. The study finds that even at low concentrations, the water-Au nanofluid exhibits superior cooling performance compared to other fluids, indicating that even small concentrations of nanoparticles can significantly impact heat transfer mechanisms.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Review
Thermodynamics
Akash Dwivedi, Mohammad Mohsin Khan, Harveer Singh Pali
Summary: A novel framework has been employed to enhance heat transfer in heat exchangers through microchannels. The use of nanofluids as working fluids shows better thermal behavior. Flow disrupters and ceramic microchannels can also improve heat transfer performance.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
Jian Song, Fei Liu, Yi Sui, Dalei Jing
Summary: This study numerically investigates the hydraulic and thermal performances of trapezoidal microchannel heat sinks, revealing that pressure drop increases with decreasing small-to-large end width ratio. Only TMCHS configurations with PCPFLI and RCCFLI show improved thermal performances as the ratio decreases, with lower thermal resistance and more uniform temperature distribution. The TMCHS with RCCFLI configuration exhibits the best overall thermal performance among the six configurations studied.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Abdullah Masoud Ali, Matteo Angelino, Aldo Rona
Summary: The study investigates the hydraulic and thermal performance of microchannel heat sink configurations for high performance electronic cooling applications using numerical modelling. Results show that inserting zig-zag fins and using 3% Al2O3 nanofluid coolant in the ducts significantly improve heat transfer efficiency and reduce contact temperature.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Ji-yu Zheng, Liang Zhang, Cheng-Gang Liu, Zheng Liang, Xiong Deng
Summary: This study investigates the thermal-hydraulic characteristics and heat transfer performance of an enhanced tube with ellipsoidal dimples and protrusions. The results show that the structure of dimples and protrusions improves heat transfer for both the internal and external flow, and the depth and number of dimples have an impact on the thermal-hydraulic characteristics.
JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS
(2022)
Article
Chemistry, Analytical
Miaolong Cao, Shi Cao, Jincheng Zhao, Jiayi Zhu
Summary: This paper proposes a microchannel heat sink model and investigates the impact of built-in ribs on the flow and heat transfer characteristics. Numerical simulation results show that the rectangular rib plate enhances heat transfer, but the comprehensive evaluation factor decreases with increasing rib length. The angle of the rib plate has little influence on heat transfer, while the thickness variation has the largest impact on the comprehensive evaluation factor. The optimal parameter combination is an angle of 0 degrees, a length of 7.5 mm, and a thickness of 0.2-0.3 mm.
Article
Thermodynamics
Po Liu, Wei Chen
Summary: This study investigates the heat transfer characteristics of wavy flowing channels with microencapsulated phase change material (MPCM) slurry as coolant. The results show that compared to traditional water cooling systems, channels with MPCM slurry coolant exhibit better thermal-hydraulic performance. The optimization of porous layer thickness and MPCM concentration can further enhance the performance.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Ziqiang He, Yunfei Yan, Shuai Feng, Xiuquan Li, Zhongqing Yang
Summary: The study shows that due to flow disturbance and boundary layer destruction, the ribbed pin-fin arrays heat sink (RPHS) exhibits the best performance in heat dissipation and temperature distribution uniformity. With the lowest total thermal resistance under the same pumping power, RPHS exerts the best comprehensive hydro-thermal performance overall.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Review
Thermodynamics
Daxiang Deng, Long Zeng, Wei Sun
Summary: This paper comprehensively reviews recent advancements in flow boiling enhancement and fabrication of enhanced microchannels. It emphasizes the flow boiling enhancement performance of these enhanced microchannels in microchannel heat sinks, while also discussing their advantages and disadvantages after summarizing the classification and manufacturing methods of enhanced microchannels.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Review
Thermodynamics
Shashank Singh, Anup Malik, Harlal Singh Mali
Summary: This article critically examines the research on modifications in geometry of channels for thermo-hydraulic performance enhancement and aims to determine the best channel configuration with optimal parameters. It explores various designs and their influencing parameters, as well as presents conclusions and potential recommendations for future research.
APPLIED THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Wei Zheng, Jianjun Sun, Chenbo Ma, Qiuping Yu, Yuyan Zhang, Tao Niu
Summary: The study introduces an enhanced heat transfer factor E to evaluate the comprehensive heat transfer performance of microchannel heat sinks, and shows that a uniform arrangement of cones in the cone-column combined heat sink can improve the flow state of the cooling medium, enhancing heat transfer. Results indicate that the cone-column combined heat sink has significantly better comprehensive heat transfer performance compared to circular microchannels.
Article
Thermodynamics
Abdullah Masoud Ali, Aldo Rona, Matteo Angelino
Summary: This study investigates the thermo-hydraulic performance of water-cooled silicon microchannel heat sinks with tape inserts. The numerical simulations show that the tape inserts improve the thermal performance of the heat sinks. Among the different configurations tested, heat sinks with four L/4 alternating pitch consecutive helical tape segments exhibit the lowest average temperature of the bottom wall, with a temperature drop of 16.13 K compared to the baseline configuration without tape.
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
(2022)
Article
Thermodynamics
Bahram Jalili, Amirhossein Rezaeian, Payam Jalili, Fathollah Ommi, Davood Domiri Ganji
Summary: This study evaluates the heat transfer phenomena of a nanofluid stream through a microchannel heat sink under the influence of a magnetic field. Aluminum oxide-water nanofluid is used as the cooling fluid, and the Koo-Kleinstreuer model is applied to calculate the viscosity and thermal conductivity of the nanofluid. The porous medium is modeled using the improved Darcy relationship, and the dispersion type of the two-equation approach is used to simulate heat transfer between the solid and fluid zones. The results indicate that the magnetic field has a direct impact on the Nusselt number, and heat transfer increases with the concentration of the nanofluid, with the highest heat transfer achieved at a concentration of 0.04.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Zahra Andleeb, Sohail Malik, Hassan Abbas Khawaja, Anders Samuelsen Nordli, Stale Antonsen, Ghulam Hussain, Mojtaba Moatamedi
Summary: Composite materials are gaining popularity in technological applications due to their significant weight savings and strength compared to metallic materials. Research shows that the heat conduction equation governs the heat flow process in composite materials under impact loads, and the thermoelastic effect can be negligible for specific drop-weight impact loads.
APPLIED SCIENCES-BASEL
(2021)
Article
Energy & Fuels
Muhammad Abdullah Sheeraz, Muhammad Sohail Malik, Khalid Rehman, Hassan Elahi, Zubair Butt, Iftikhar Ahmad, Marco Eugeni, Paolo Gaudenzi
Summary: In this research, an eco-friendly wind energy harvesting device based on the piezoelectric technique is analytically modeled, numerically simulated, and statistically optimized for low power applications. The proposed device not only improves the electrical output efficiency but also addresses the limited lifespan of batteries.
Article
Materials Science, Multidisciplinary
Ahsan Ali, Muhammad Abdullah Sheeraz, Saira Bibi, Muhammad Zubair Khan, Muhammad Sohail Malik, Wajahat Ali
Summary: In this study, an M-shaped cantilever piezoelectric energy harvester was modeled and optimized using advanced artificial intelligence algorithms. Through finite element analysis and numerical investigation, optimal design parameters and performance output values were identified. The results showed that machine learning optimization outperformed traditional statistical methods and can enhance the bandwidth of piezoelectric vibrational energy harvesters.
FUNCTIONAL MATERIALS LETTERS
(2021)
Review
Thermodynamics
Faraz Ahmad, Fawad Ahmed, Husan Ali, Zabdur Rehman, Muhammad Suleman, Izaz Raouf
Summary: This paper numerically analyzes the hydrothermal behavior of different cross-sectional geometries of microchannel heat sinks using ANSYS Fluent. The proposed design of the plus-like shape new microchannel (NMC) proves to have the best performance by achieving the lowest wall temperature, thermal resistance, and entropy generation rate, as well as the highest thermal enhancement factor and thermal transport efficiency. The elliptical, circular, and hexagonal microchannels perform the worst in this study.
JOURNAL OF NON-EQUILIBRIUM THERMODYNAMICS
(2022)
Article
Materials Science, Composites
Muhammad Ramzan Abdul Karim, Danish Tahir, Khurram Imran Khan, Azhar Hussain, Ehsan Ul Haq, Muhammad Sohail Malik
Summary: Epoxy-bamboo long natural fibres composites were prepared by hand lay-up method to study the influence of fibre's treatment on their characteristics. SEM showed increased surface roughness due to the removal of amorphous compounds from the treated fibre as confirmed by the disappearance of certain peaks in FTIR spectroscopy. Resultantly, similar to 52% increase in crystallinity was observed by XRD analysis. TGA results also showed the effectiveness of the treatment as mass loss for treated fibres was similar to 15% lesser than the untreated fibres. Moreover, thermogravimetric analysis of composites showed highest mass loss in untreated fibres composites and lowest in neat epoxy. The DSC-DTA curves indicated an early start of initiation temperature in treated fibre composite. Tension tests showed similar to 12% and similar to 16% increase in tensile strength and modulus respectively for treated fibres composite due to increased interfacial strength caused by fibre treatment. Treatment also resulted in decreased impact energy and water absorption level.
PLASTICS RUBBER AND COMPOSITES
(2023)
Article
Energy & Fuels
Adnan Ayaz, Faraz Ahmad, Mohammad Abdul Aziz Irfan, Zabdur Rehman, Krzysztof Rajski, Jan Danielewicz
Summary: With the depletion of fossil reserves, the demand for renewable energy, especially solar power plants, has reached its peak globally. In order to properly estimate the solar energy potential, a feasibility study is necessary before installing solar power plants. This study compared ground-based measurements with satellite-based data and found significant differences. Real-time measurements are essential for accurately assessing solar energy resources.
Article
Thermodynamics
Shahvaiz Khan, Taqi Ahmad Cheema, Malik Hassan, Muhammad Sohail Malik, Cheol Woo Park
Summary: The study investigates the morphological characteristics of thermoelectric generators (TEGs) for electricity generation using radiative night-time sky cooling phenomenon. Experimental and numerical approaches were applied and the results showed that reducing plate thickness, increasing the number of thermocouples, and increasing TEG leg height can increase the open-circuit voltage.
HEAT AND MASS TRANSFER
(2022)
Article
Energy & Fuels
Muhammad Abdullah Sheeraz, Muhammad Sohail Malik, Khalid Rahman, Hassan Elahi, Muhammad Khurram, Marco Eugeni, Paolo Gaudenzi
Summary: A simplified and effective analytical model of a piezoelectric sensor is proposed and experimentally validated in this study. The results show that the model is suitable for both conventional wind energy harvesting and flutter harvesting, making it significant for aerospace applications.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Multidisciplinary Sciences
Shizhong Zhang, Faraz Ahmad, Amjid Khan, Nisar Ali, Mohamed Badran
Summary: The study investigates the performance of a microchannel heat sink by adding different surface enhancers. Cones constructed at a 45-degree angle reduce frictional losses but show compromise on thermal behavior.
SCIENTIFIC REPORTS
(2022)
Review
Energy & Fuels
Zabdur Rehman, Faraz Ahmad, Hafiz Ali Muhammad, Fahid Riaz, Hafiz Muhammad Uzair Ayub, Mudassir Hasan, Moonyong Lee
Summary: The sustainability and economic development are closely related to energy consumption and conversion processes. With the increasing demand for energy consumption and environmental concerns, the need for miniaturized light-weight heat exchangers with high efficiency and adequate heat transfer characteristics has become crucial. Traditional heat exchangers are not suitable anymore and there have been various researches to improve the performance of miniaturized heat exchangers.
FRONTIERS IN ENERGY RESEARCH
(2022)
Article
Energy & Fuels
Kareem Akhtar, Haseeb Ali, Israr Ud Din, Azed Abbas, Muhammad Zeeshan Zahir, Faraz Ahmad, Fayyaz Alam, Nasir Shah, Muhammad Aamir
Summary: This study proposes the use of symmetrical ogive-shaped ribs on the walls of microchannel heat sinks (MCHS) to improve their thermal performance with minimal pressure drop. Numerical investigations using the laminar conjugate heat transfer model show that the inclusion of symmetrical ogive-shaped ribs improves the Nusselt number of MCHS. The MC-SAWR configuration is found to be the best configuration that provides high cooling performance.
Article
Thermodynamics
Haseeb Ali, Nasir Shah, Kareem Akhtar, Muhammad Azed Abbas, Muhammad Fayyaz Alam, Faraz Ahmad, Israr Ud Din
Summary: This study proposes using novel ogive-shaped ribs and cavities to enhance the thermal performance of a microchannel heat sink (MCHS). A three-dimensional conjugate numerical model was employed to investigate the impact of these modifications on the hydro-thermal performance of MCHS in laminar flow regime (Reynolds number 100-1000). The results show that flow separation occurs on the trailing edge of ogive ribs, promoting convective heat transfer by disrupting the boundary layer and enhancing fluid mixing on the downside of ogive ribs due to the formation of recirculation zones. Conversely, stagnant zones are created inside the ogive cavity due to very low fluid local velocity which results in a decrease of local Nusselt number. The study reports a 41.34% maximum improvement in Nusselt number for MCHS with ogive ribs on side channel walls and a maximum thermal enhancement factor of 1.42 for MCHS with ogive ribs on the bottom channel wall.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2023)
Article
Computer Science, Information Systems
Shizhong Zhang, Faraz Ahmad, Haseeb Ali, Sadiq Ali, Kareem Akhtar, Nisar Ali, Mohamed Badran
Summary: Traditional cooling technologies are not suitable for cooling electronic chips due to their small size and high heat generation. Microchannel heat sink (MCHS) is a promising option for better cooling performance. This study investigates the hydrothermal performance of MCHS with novel trefoil shape ribs. The results show that adding trefoil ribs to the walls of smooth microchannels significantly improves their thermal performance, although at the cost of increased pressure. The configuration with side wall trefoil ribs (MC-SWTR) has the highest thermal enhancement factor and is the most superior among all considered trefoil rib configurations.
Proceedings Paper
Engineering, Multidisciplinary
Bilawal Ramzan, Sohail Malik, S. M. Ahmad, Milena Martarelli
Summary: Rails are a basic mode of transportation worldwide. Conventional crack detection methods for in-service railway lines are either semi-automated or manual, making the inspection process time-consuming.
PROCEEDINGS OF 2021 INTERNATIONAL BHURBAN CONFERENCE ON APPLIED SCIENCES AND TECHNOLOGIES (IBCAST)
(2021)