Article
Thermodynamics
Kai Tang, Yanpei Huang, Guiping Lin, Yuandong Guo, Jinyin Huang, Haimiao Lin, Hongxing Zhang, Qi Yang, Jianyin Miao
Summary: This study designed and fabricated a manifold microchannel heat sink to enhance the heat dissipation capability of high-heat-flux hotspots. Ammonia with excellent thermophysical properties was selected as the working fluid, and its thermal-hydraulic characteristics were evaluated. The effects of flow rate, heat flux, saturation temperature, and inlet conditions on the heat sink were investigated through experiments. The results showed that under high-subcooled inlet conditions, the thermal resistance decreased and pressure drop increased with increasing flow rate. Under near-saturated inlet conditions, jet impingement and microchannel cooling were identified as the dominant heat transfer mechanisms.
APPLIED THERMAL ENGINEERING
(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
C. J. Ho, Jian-Kai Peng, Tien-Fu Yang, Saman Rashidi, Wei-Mon Yan
Summary: By studying the thermal performance evaluation of microchannel heat sinks with nanofluids, it is found that the use of nanofluids can reduce the thermal resistance of the heat sink, increase the uniformity index of the heating surface, and enhance the mean convection heat transfer coefficient.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Chemistry, Analytical
Tao Zhou, Bingchao Chen, Huanling Liu
Summary: This article discusses the use of topology optimization to design heat exchangers, proposing a novel design with three inlets and one outlet. The impact of channel depth on heat exchanger design, as well as the flow and heat transfer performance of the heat exchangers, are also studied. Results show that topology optimization can significantly improve heat transfer performance compared to traditional design methods.
Article
Thermodynamics
Pankaj Srivastava, Ruchitkumar Ishwarlal Patel, Anupam Dewan
Summary: A comparative study was conducted on the flow and thermal characteristics in a double-layered microchannel with bifurcation, showing that the bifurcation plates reduce the overall thermal resistance but increase pressure drop and pumping power. Nusselt number is higher in parallel-flow than counter-flow, but the difference is greater at low Re values and diminishes with increasing flow rate. Counter-flow offers a more uniform temperature distribution essential for thermal system reliability.
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
Energy & Fuels
Hossein Javadi, Javier F. Urchueguia, Seyed Soheil Mousavi Ajarostaghi, Borja Badenes
Summary: The study found that Ag-MgO/water hybrid nanofluid has the most favorable heat transfer performance among the considered options, with better effectiveness and lower thermal resistances but higher pressure drops compared to pure water. However, all evaluated hybrid nanofluids showed lower coefficient of performance improvement than unity due to their higher pressure drops.
Article
Thermodynamics
Rouhollah Moosavi, Mehdi Banihashemi, Cheng-Xian Lin, Po-Ya Abel Chuang
Summary: The study investigates the three-dimensional heat transfer and pressure drop within a microchannel with transverse vortex generator and porous medium. The results show that the convective heat transfer coefficient increases with height and the number of vortex generators, but the pressure drop also increases. By normalizing the changes in heat transfer coefficient and pressure drop using a thermal performance ratio, the microchannel with a combination of vortex generator and porous medium exhibits the highest thermal performance ratio.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Recep Ekiciler, Muhammet Samet Ali Cetinkaya
Summary: This study analyzed the heat transfer and flow behavior of water-based monotype nanofluid and hybrid nanofluid in a duct with ribs, finding that the Nusselt number increases with the Reynolds number and the triangular rib showed the best heat transfer rate. The results suggest a promising future for the use of hybrid nanofluids in cooling and heating applications in the industry.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2021)
Article
Thermodynamics
R. Vinoth, B. Sachuthananthan
Summary: The study compared the heat transfer performance of pentagonal and triangular channel oblique finned microchannel heat sinks using different nanofluids, with results showing that the pentagonal channel heat sink performed better in heat transfer and increased pressure drop when using hybrid nanofluid.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Nanoscience & Nanotechnology
Oluwasegun S. Omosehin, Adekunle O. Adelaja, Olabode T. Olakoyejo, Manasseh O. Oyekeye
Summary: This paper numerically investigates the effects of hybridization of water-based copper-alumina nanofluid on the thermal performance, pressure drop, and the figure of merit (FOM) inside a three-dimensional microchannel heat sink. The study shows that higher concentrations of copper nanoparticles lead to better thermal enhancement and FOM of the hydridized nanofluid. Additionally, the maximum FOM is favored by a concentration of copper nanoparticles >= 0.75% for Reynolds number of 400 and <0.75% vol. for Reynolds number of 1200.
MICROFLUIDICS AND NANOFLUIDICS
(2022)
Article
Thermodynamics
R. Vinoth, B. Sachuthananthan, A. Vadivel, S. Balakrishnan, A. Gnana Sagaya Raj
Summary: The experimental study analyzed the heat transfer characteristics of an oblique finned curved microchannel heat sink with different working fluids. The results showed that the curved microchannel heat sink had higher heat transfer rate, PEC and pressure drop compared to the straight channel heat sink. When using a hybrid nanofluid, the heat transfer rate of the curved microchannel heat sink was also higher.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Rouhollah Moosavi, Mehdi Banihashemi, Cheng-Xian Lin
Summary: This paper numerically investigates the thermal performance of a microchannel with different porous media insert configurations. Results show that the transverse arrangement of porous blocks at low Reynolds numbers and the longitudinal arrangement at high Reynolds numbers provide the best thermal performance. The highest thermal performance ratio is achieved when the porous material is placed along the walls in a longitudinal direction.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
Article
Thermodynamics
Huanling Liu, Ying Yao, Gongnan Xie, Zhongliang Xie
Summary: Two heat sink designs, the enhanced design and the staggered double P-type design, were proposed for better thermal management performance. Numerical studies and experimental verification were conducted to investigate their cooling capabilities. The results showed that optimizing the layout could effectively improve heat transfer performance, with the staggered double P-type design exhibiting the best heat dissipation ability among the three heat sinks.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Kai Tang, Guiping Lin, Yuandong Guo, Jinyin Huang, Hongxing Zhang, Jianyin Miao
Summary: A novel manifold microchannel heat sink with diverging/converging channels is proposed to improve heat transfer performance. The effects of key parameters on the thermal-hydraulic performance are investigated, and the optimized parameter combinations are identified.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Seyed Amin Bagherzadeh, Esmaeil Jalali, Mohammad Mohsen Sarafraz, Omid Ali Akbari, Arash Karimipour, Marjan Goodarzi, Quang-Vu Bach
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2020)
Article
Thermodynamics
Saeed Nazari, R. Ellahi, M. M. Sarafraz, Mohammad Reza Safaei, Ali Asgari, Omid Ali Akbari
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2020)
Article
Thermodynamics
Shahrouz Yousefzadeh, Hamid Rajabi, Navid Ghajari, Mohammad Mohsen Sarafraz, Omid Ali Akbari, Marjan Goodarzi
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2020)
Article
Thermodynamics
M. M. Sarafraz, N. N. Tran, N. Pourali, E. V. Rebrov, V. Hessel
ENERGY CONVERSION AND MANAGEMENT
(2020)
Article
Thermodynamics
Saman Rashidi, Faramarz Hormozi, Mohammad Mohsen Sarafraz
Summary: Boiling process is an efficient mechanism of heat transfer with important applications in various sectors. This paper reviews the potential applications and challenges of boiling heat transfer mechanism in different fields, pointing out the focus for future research.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
Saman Rashidi, Faramarz Hormozi, Mohammad Mohsen Sarafraz
Summary: The boiling process is widely used in industrial applications for heat transfer, utilizing the latent heat of vaporization to dissipate large amount of heat flux. It is suitable for thermal management of various thermal systems. Boiling is a complex phenomenon involving phase change and perturbation in regions with irregular internal structure, focusing on nucleation, bubble formation, and micro-mechanisms.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
Zhixiong Li, M. M. Sarafraz, Arash Mazinani, Tasawar Hayat, Hamed Alsulami, Marjan Goodarzi
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2020)
Article
Thermodynamics
Zhixiong Li, A. Mazinani, Tasawar Hayat, Abdullah A. A. A. Al-Rashed, H. Alsulami, Marjan Goodarzi, M. M. Sarafraz
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2020)
Article
Thermodynamics
M. M. Sarafraz, Marjan Goodarzi, Iskander Tlili, Tawfeeq Abdullah Alkanhal, Maziar Arjomandi
Summary: A thermodynamic model was developed to assess the energetic performance of a dual receiver concentrated photovoltaic/thermal plant, showing that the thermal performance of the system strongly depends on the fraction (phi) of thermal energy allocated for different purposes. The study also highlights the importance of thermal performance of the coolant and the potential of nano-suspensions.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
Zhixiong Li, M. M. Sarafraz, Arash Mazinani, Hazim Moria, Iskander Tlili, Tawfeeq Abdullah Alkanhal, Marjan Goodarzi, Mohammad Reza Safaei
ENERGY CONVERSION AND MANAGEMENT
(2020)
Article
Physics, Fluids & Plasmas
N. Pourali, M. M. Sarafraz, V Hessel, E. Rebrov
Summary: The study shows that changing the features of pulsed voltage, such as rise time and pulse width, affects the characteristics of the plasma formed inside the discharge reactor, with an increase in pulse width and rise time leading to higher electron and ion density. The results of this study strongly demonstrate the effectiveness of controlling plasma inside DBD reactors with negative pulse voltage combined with positive DC voltage.
PHYSICS OF PLASMAS
(2021)
Article
Thermodynamics
Iman Mazinani, Mohammad Mohsen Sarafraz, Zubaidah Ismail, Ahmad Mustafa Hashim, Mohammad Reza Safaei, Somchai Wongwises
Summary: Two disastrous tsunamis in 2004 and 2011 led to the destruction of many bridges, prompting experimental tests and computational analysis to better understand the forces exerted by tsunami bores on coastal bridges. The results of the study demonstrated that the fully coupled FSI models accurately captured tsunami wave forces across various wave heights and shallow depths, providing valuable insights for evaluating tsunami bore forces on coastal bridges.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2021)
Article
Biophysics
Mohammad Hasan Taheri, Oveis Pourmehran, Mohammad Mohsen Sarafraz, Keveh Ahookhosh, Ali Farnoud, Xinguang Cui
Summary: The study found that swirling flow can significantly enhance the deposition efficiency of particles in the mouth, but releasing particles inside the mouth or using a smaller injection diameter can greatly reduce the deposition efficiency under swirling flow conditions.
BIOMECHANICS AND MODELING IN MECHANOBIOLOGY
(2021)
Article
Engineering, Environmental
Nam Nghiep Tran, Marc Escriba Gelonch, Shu Liang, Zihao Xiao, Mohammad Mohsen Sarafraz, Marina Tisma, Hans-Jurgen Federsel, Steven V. Ley, Volker Hessel
Summary: This study investigated enzymatic pre-treatment of grease trap waste for biodiesel production, reducing FFA levels through an esterification reaction. Results showed that using commercial enzymes in continuous-flow experiments achieved better FFA reduction than batch processes. The continuous-flow reactors were also more time-efficient, completing experiments in less than 1.5 days compared to 6 days for batch processes.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Multidisciplinary
Rahmat Ellahi, Farooq Hussain, Syed Asad Abbas, Mohammad Mohsen Sarafraz, Marjan Goodarzi, Mostafa Safdari Shadloo
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)