Article
Thermodynamics
Yacine Khetib, Khaled Sedraoui, Abdellataif Gari
Summary: This study numerically investigated a micro-pin-fin heat sink to improve its cooling capability and productivity. It found that the RS configuration had the maximum heat transfer while also yielding the maximum pressure drop.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Yigit Serkan Sahin, Beytullah Ismet Toprak, Ismail Solmaz, Ozgur Bayer
Summary: With the rapid development in the electronics industry, the thermal management of high power density electronic products has become crucial. This study proposes an integrated heat sink composed of aluminum foam and pin-finned heat sink configurations as an effective solution for the thermal management of such electronic products. Through numerical investigation and experimental examination, the integrated heat sink demonstrates favorable heat removal and pressure drop characteristics under various design conditions.
APPLIED THERMAL ENGINEERING
(2023)
Review
Thermodynamics
Dhayanidhi Kesavan, Rajendran Senthil Kumar, Piramanandhan Marimuthu
Summary: This article specifically focuses on the recent advancements of air-cooled pin-fin heatsinks for heat transfer applications. It explores the impact of different shapes, orientations, spacing, and perforations on heat transfer performance, providing insights into the advantages and potential of pin-fin heatsink technology for thermal management.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
Tehmina Ambreen, Arslan Saleem, Cheol Woo Park
Summary: This study evaluates the thermal efficiency of MXene-based nanofluid in a pin-fin heat sink through experimental and numerical analysis. The results show that using MXene coolant can significantly enhance heat transfer in the heat sink.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Mohanad A. Alfellag, Hamdi E. Ahmed, Mohammed Gh Jehad, Marwan Hameed
Summary: The numerical investigation compared the Metal Foam Pin-Fin Heat Sink (MFPFHS) to the traditional Solid Pin-Fin Heat Sink (SPFHS) and found that the MFPF exhibited superior heat dissipation and reduced frictional losses. The study also showed that increasing the pin diameter ratio and the number of pins in the MFPF resulted in significant heat transfer enhancement and performance evaluation criteria improvement.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Amir Rezazad Bari, Mohammad Zabetian Targhi, Mohammad Mahdi Heyhat
Summary: This study investigated the effect of hybrid pin-fin patterns on a heat sink's performance and studied flow characteristics such as secondary flow formation and flow-wall interaction. The findings showed that hybrid arrangements perform better than single pin-fin patterns. Case 3, in particular, exhibited the highest performance evaluation criteria with a value of 1.84 at Re = 900. The study also revealed that the instantaneous change in pattern from elliptical to hexagonal increased secondary flow and maximum velocity in the channel's cross-section.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2023)
Article
Energy & Fuels
Y. Nandakishora, Ranjit K. Sahoo, S. Murugan, Sai Gu
Summary: Carbon capture by cryogenic treatment is an emerging method for reducing CO2 emissions, offering energy-saving and environmental benefits. This study focuses on analyzing a plate-fin heat exchanger (PFHE) for decreasing the temperature of CO2 and N-2 mixture, and it includes a comparative study of heat exchanger parameter evaluation correlations, software validation with experimental results, and investigating the influence of gas mixture inlet temperature, CO2 concentration, pressure drop, and mass flow rate on PFHE effectiveness.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Engineering, Multidisciplinary
Amin Shahsavar, Mehdi Heidarian, Cagatay Yildiz, Muslum Arici
Summary: The thermal performance of a heat sink with open-ring pin fins (ORPF) cooled by biologically synthesized silver-water nanofluid is studied. The arrangement of ORPFs, namely in-line and staggered, is investigated. The effects of different nanoparticle volume fractions (phi=0-1%) and Reynolds numbers (Re=500-2000) on the thermal performance and entropy generation behavior are evaluated. Results show that the convective heat transfer coefficient is improved by up to 71% and 19.3% in in-line, and 65% and 24.7% in staggered ORPF configurations, respectively. The addition of nanoparticles and increase in Reynolds number enhance the thermal performance and reduce entropy generation rates.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Thermodynamics
Young Jin Lee, Sung Jin Kim
Summary: The study optimizes the distribution of fin density using the Kriging method to reduce thermal resistance and weight.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Amin Shahsavar, Mohammad Shahmohammadi, Ighball Baniasad Askari
Summary: The study demonstrates the significant influence of different fin heights on the hydrothermal performance and heat transfer of a pin-fin heat sink, with 2.25mm fin height showing a more uniform vorticity distribution and the highest Performance Evaluation Criterion (PEC), while 1.5mm fin height exhibits the lowest entropy generation rate.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
M. M. Alqarni, Emad E. Mahmoud, Tareq Saeed, Vakkar Ali, Muhammad Ibrahim
Summary: In this article, a numerical method was used to analyze the exergy of water/boehmite alumina nanofluid in a pin-fin micro heat sink. The study found that increasing both the velocity and volume fraction of nanoparticles decreases the output and gain exergy values, with different shapes of nanoparticles affecting the results differently.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Energy & Fuels
Jessica Martha Nunes, Jeferson Diehl de Oliveira, Jacqueline Biancon Copetti, Sameer Sheshrao Gajghate, Utsab Banerjee, Sushanta K. Mitra, Elaine Maria Cardoso
Summary: This study analyzes the influence of different heights of square micro pin fins on pressure drop and heat transfer behavior. The results show that the highest micro pin fins configuration provides a more uniform and lowest wall temperature distribution compared to the lowest configuration. Experimental results for two-phase flow condition demonstrate that an increase in mass flux enhances heat transfer for low heat flux, with boiling heat transfer becoming more predominant as heat flux increases. The pressure drop drastically increases with the vapor amount flowing into the system, regardless of the pin fin height.
Article
Thermodynamics
Rajendran Prabakaran, Mohammad Salman, Poongavanam Ganesh Kumar, Dongchan Lee, Sung Chul Kim
Summary: This study investigated the evaporation characteristics of the R290 + CF3i mixture in a plate heat exchanger and found that nucleate boiling is quenched at lower vapor quality. The two-phase frictional pressure drop increases with mean vapor quality. The heat transfer coefficient is largely augmented with increases in mass flux.
APPLIED THERMAL ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Adnan I. Khdair
Summary: Nowadays, the cooling and heat loss process is essential to prevent the breakdown of devices due to the increasing power and operating temperature. This study investigated the performance of mini-channels with different inlet headers, finding that those with elliptical pin fins had the lowest velocity distribution non-uniformity and heat sink surface temperature. The use of nanofluid was also examined, and it was found that higher volume fraction and Reynolds number resulted in significantly reduced thermal resistance and higher Nusselt number.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Thermodynamics
Ziqiang He, Yunfei Yan, Li Zhang
Summary: The study found that micro heat sinks with arc ribbed pin-fins exhibit the best comprehensive performance, and staggered ribs arrangement performs better than in-line ribs arrangement. The average Nu number increases first and then decreases with the increase in rib width.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Cong Li, Jiali Wang, Chenhui Wang, Yanke Jin, Yina Yao, Rui Yang
Summary: This study investigates the impact of NaCl water droplets with various concentrations on a heated surface. The results show that the impact patterns can be categorized into different types, and models are established to predict the spreading behavior of droplets with different concentrations. Additionally, high concentration droplets exhibit more violent boiling and have lower residual energy and rebound time.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
C. Barrera, V. Castro, F. Escudero, J. J. Cruz, I. Verdugo, J. Yon, A. Fuentes
Summary: This study focuses on the characterization of soot maturity and sooting propensity of anisole fuel in a controlled laminar coflow diffusion flame. The results show that the spatial distribution of soot volume fraction is enhanced near the flame centerline, while soot production is promoted near the flame wings. The temperature increase also affects the maturity of soot particles.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Roman W. Morse, Jason Chan, Tiago A. Moreira, Jared J. Valois, Evan T. Hurlburt, Jean-Marie Le Corre, Arganthael Berson, Kristofer M. Dressler, Gregory F. Nellis
Summary: This study investigates the dryout of liquid film and the role of disturbance wave frequency. Experimental results indicate that the heat transfer coefficient associated with optimal boiling conditions is maximized when the surface is dry 5% of the time, independent of pulse amplitude and frequency. Liquid-film measurements, dryout statistics, and direct observation suggest that disturbance-wave frequency can be manipulated by density-wave oscillations in the flow field.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
E. J. Vega, J. M. Montanero
Summary: In this study, we experimentally investigated the bursting of a bubble covered with a surfactant. We found that the bubble bursting time is longer compared to a surfactant-free bubble due to interfacial elasticity. Furthermore, the Marangoni stress drives liquid flow that allows the jet to escape from the end-pinching mechanism within a certain surfactant concentration range.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Guofu Sun, Yi Zhan, Tomio Okawa, Mitsuhiro Aoyagi, Akihiro Uchibori, Yasushi Okano
Summary: Experiments were conducted on liquid jets ejected from oval nozzles to investigate the effects of nozzle orifice shape on jet behavior. The study found that the liquid jet exhibited different characteristics at different liquid flow rates. Correlations were established to predict the liquid jet state and characteristics of the secondary droplets produced during jet impact onto a solid surface. This research extended the available knowledge on liquid jet behavior.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Jeonghoon Lee, Laurent Zimmer, Takeshi Saito, Shinji Nakaya, Mitsuhiro Tsue
Summary: This study investigates the effects of spatial resolution on DMD amplitudes and spatial mode strengths, and proposes scaling factors to correct for the resolution differences. The results show that the proposed scaling factors successfully normalize the amplitudes and spatial modes, allowing for quantitative comparison of data obtained with different spatial resolutions. This study is significant for analyzing spatiotemporal data in various fields.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Yanli Zhao, Shibing Kuang, Xiaoliang Zhang, Mingjun Xu
Summary: This study experimentally investigates the dynamic process of water droplet impacting different wood surfaces and analyzes and discusses the impacting phenomena, phenomena distribution, droplet spreading dynamics, and maximum spread factor. The results show that the impacting process can be distinguished by Weber numbers and Reynolds numbers, and can be predicted by mathematical expressions.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Aakhash Sundaresan, Atul Srivastava, Callum Atkinson
Summary: This study presents the first-ever application of an advanced methodology, combining two-color laser-induced phosphorescence and particle image velocimetry, to investigate the heat transfer mechanisms on the surface of a cylinder placed inside a confined square duct. The technique allows for simultaneous measurement of velocity and temperature fields, reducing the complexity and costs associated with separately measuring temperature distributions. Experimental observations show that increasing the mass flow rate enhances heat removal from the cylinder surface, and increasing the cylinder heat input enhances heat transfer in the rear portion of the cylinder.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Harish K. Patel, Sukhjeet Arora, Rutuja Chavan, Bimlesh Kumar
Summary: This study experimentally analyzed the multiscale statistical assessment of scour depth surrounding spur dikes with downward seepage. The research found that seepage affects the morphological behavior and hydrodynamic characteristics of the channel bed, leading to changes in scour formation. The rate of scour depth changes initially increases with higher seepage velocity but eventually becomes constant over time.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Justas Sereika, Paulius Vilkinis, Gediminas Skarbalius, Algis Dziugys, Nerijus Pedisius
Summary: This study experimentally investigated the pulsatile flow structure based on a transitional-type cavity. It was found that the pulsation amplitude has a more significant effect on the dynamics of recirculation zone than the pulsation frequency. Pulsatile flow can reduce the size of the recirculation zone.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Merav Arogeti, Eran Sher, Tali Bar-Kohany
Summary: This study provides a detailed exploration of the events that occur when a droplet hits a dry solid surface of various small sizes, with a focus on the deposition, receding breakup, and prompt splash phases. By utilizing non-dimensional analysis and graphical representation, the boundaries between different events are defined, and criteria for differentiation based on target-to-drop ratio, Reynolds, and Webber numbers are presented.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Tianxiong Li, Fei Wen, Yingchun Wu, Botong Wen, Lei Wang, Jinxin Guo, Xuecheng Wu
Summary: This study investigates the structure of the flow field induced by a strut in a scramjet and its influence on flame stabilization. Experimental and numerical analyses reveal that the flow field exhibits features beneficial for flame stabilization, but the asymmetry of the flow poses a challenge to flame establishment.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Syed Ehtisham Gillani, Yasir M. Al-Abdeli
Summary: This study investigates the asymmetry in bluff-body stabilised annular jets and finds that swirl can significantly mitigate the asymmetry and restore the symmetry of the jets. Moreover, increasing the Reynolds number and the swirl intensity can both decrease the asymmetry of the jets.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Utsav Bhardwaj, Rabindra Kumar, Shyama Prasad Das
Summary: This study presents an experimental investigation on flooding phenomenon in a pulsating heat pipe (PHP) unit cell, and analyzes the impact of flooding on the performance of PHP. The study recognizes three different flooding mechanisms and finds that currently accepted correlations for predicting flooding velocity are inaccurate. The study emphasizes the need for further research on flooding in PHPs.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Yunpeng Xue, Yongling Zhao, Shuo-Jun Mei, Yuan Chao, Jan Carmeliet
Summary: This study investigates the impact of building morphology on local climate, air quality, and urban microclimate. The researchers conducted an experimental investigation in a large-scale water tunnel, analyzing heat and flow fields using Laser-induced Fluorescence (LIF) and Particle Image Velocimetry (PIV). The findings show that factors such as canyon configuration, buoyant force, and approaching flow magnitude significantly influence fluid flow in street canyons, and the morphology of the street canyon dominates ventilation rate and heat flux. For example, changing the aspect ratio of a street canyon can lead to a significant change in air ventilation rate, ranging from 0.02 to 1.5 under the same flow conditions.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)