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A low-cost electrowetting on dielectric semi-continuous pump for application to microfluidic reconfigurable devices Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-03-12 Behzad Parsi, Josh Augenstein, R. Daniel Maynes, Nathan B. Crane
An electrowetting on dielectric (EWOD) pump is a microfluidic pump that uses electrowetting to manipulate liquid droplets in a channel, offering an alternative approach to traditional mechanical pumps. EWOD-based pumps have significant potential for various microfluidic applications. For instance, by integrating microfluidic pumps with a radio frequency (RF) device, it is possible to create a microfluidic
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Non-intrusive temperature measurements for transient freezing in laminar internal flow using laser induced fluorescence Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-03-11 Bouke Johannes Kaaks, Sebastian Couweleers, Danny Lathouwers, Jan-Leen Kloosterman, Martin Rohde
This work presents two color LIF temperature measurements for the transient freezing in a square channel under laminar flow conditions. This is the first time non-intrusive temperature measurements were performed within the thermal boundary layer during the transient growth of an ice layer in internal flow. A combination of a local outlier factor algorithm and a smoothing operation was used to remove
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Aerodynamic investigation of the turbulent flow past a louvered-fin-and-tube automotive heat exchanger Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-03-11 Alessandro Zarri, Miguel Baena Botana, Julien Christophe, Christophe Schram
Turbulent flow past a radiator contributes to noise emission when interacting with a downstream cooling fan. This study examines turbulent flow characteristics downstream of a radiator, focusing on turbulence production, dissipation, non-homogeneity, and anisotropy. We assess turbulence models based on isotropy and homogeneity for noise prediction in real applications. Results show significant non-homogeneity
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Ice accretion characteristics on rotating aeroengine fan blades Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-03-11 Linchuan Tian, Haiyang Hu, Ramsankar Veerakumar, Hui Hu
An experimental study was conducted to characterize the dynamic ice accretion process on rotating aero-engine fan blades to evaluate the icing-induced detrimental effects on the fan rotor performance. A scaled spinner-fan model was installed in an Icing Research Tunnel and exposed to typical rime and glaze icing conditions. It was found that, while ice structures accreted on both the suction and pressure
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A visualization study on characteristics of severe slugging in the S-shaped riser with a kilometer-scale pipeline Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-03-08 Haiyang Yu, Qiang Xu, Bo Huang, Yeqi Cao, Liejin Guo
Severe slugging is a hazardous multiphase flow phenomenon in the process of offshore oil and gas transportation. Few visualization image data are obtained in experimental riser systems with kilometer-scale pipelines. Therefore, the interface distribution characteristics of severe slugging are visually investigated in a 29.1 m high S-shaped riser connecting a 1657 m long horizontal pipeline. Based on
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Enhancing pool boiling in microgravity using micro-fins and an electrostatic field under different liquid subcooling Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-03-06 A.I. Garivalis, B. Liu, J. Wei, P. Di Marco
Despite boiling heat transfer is an effective way to remove heat and its performances comply with the high requirements of the electronics cooling and aerospace devices, in reduced gravity levels environments a decrease of the Critical Heat Flux (CHF) occurs. In the past decades, several techniques were developed to enhance the performances of a boiling system, such as external force fields and surface
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Optimizing stability and enhancing flow boiling heat transfer performance of Al2O3-TiO2/water hybrid nanofluids Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-03-02 Wenjie Guo, Yuling Zhai, Xiaoyan Huang, Zhouhang Li
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Experimental evaluation of airlift pumps' thermal and mass transfer capabilities Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-29 Alexander Doucette, Shahriyar G. Holagh, Wael H. Ahmed
Airlift pumps are a versatile category of two-phase flow equipment principally employed for the transportation of liquids. Facilitating interfacial heat and mass transfer between gas and liquid phases, these pumps have the potential to serve as an efficient heat and mass exchanger in various industrial applications. Nonetheless, this capability of airlift pumps has remained relatively unexplored in
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Two-phase air-water measurements in fully-rough free-surface flows Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-28 Jiayue Hu, Hubert Chanson
Self-aerated skimming flows down steep stepped chutes - (A) Laboratory channel, h/d = 0.63, h = 0.1 m, Re = 1.95×10; (B) Hinze dam prototype stepped spillway under Froude similar conditions, h/d = 0.63, h = 1.5 m, Re = 1.16×10; (C) Dimensionless longitudinal distribution of surface velocities:: comparison between non-aerated surface velocity (Theory, Laboratory data, Hinze Dam spillway prototype data)
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Experimental investigation of free-rising characteristics of spilled oil droplets in natural waters Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-21 Anqi Jiang, Longxi Han, Chenfang Wang, Xiangming Niu
This work focuses on investigating the dynamics of different types of oil droplets rising freely in water columns. Fifteen different types of oils were selected to cover most of the conventional oils. The particle size range of the study is 1.41∼13.58 mm, which can cover the largest oil droplet size that may occur in the real environment. Investigation results show that oil droplet characteristics
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Experimental investigation on local flow structures of upward cap-bubbly flows in a vertical large-size square channel Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-19 Haomin Sun, Tomoaki Kunugi, Takehiko Yokomine, Xiuzhong Shen, Takashi Hibiki
Gas–liquid two-phase flows are typical in engineering systems involving heat and mass transfers. The cross-sectional geometries and sizes of these flow channels vary, exerting a notable impact on the thermofluid behavior. To develop thermofluid models, it is imperative to obtain local measurements of two-phase flows and gain insights into their characteristics from these measurements. Numerous experimental
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Experimental study on the cavitation phenomenon effect on the efficiency of a turbulent premixed flame kerosene/air Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-16 L. Lamoot, B. Manescau, K. Chetehouna, E. Obame
In order to characterize the influence of cavitation in a nozzle on a turbulent premixed kerosene/air flame, an experimental study was conducted using a NexGen burner. This study was carried out in two distinct stages. The first stage was devoted to characterizing the necessary conditions for inducing the cavitation phenomenon, using a novel experimental device enabling fluidic study. The second stage
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Dynamics of a buoyant collapsible tube under a free surface Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-14 R. Aashish, P. Deepu, Subrata Kumar
The non-linear dynamics of an extremely thin-walled collapsible tube carrying compressed air, surrounded by a denser fluid with a free surface are investigated. When the surrounding fluid is water, a wide range of dynamics in the oscillatory regime (OR) of the tube response are observed, including period-1, weak/strong aperiodic, and period-2 oscillations. However, aperiodic tube response dominates
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Examining surface wetting and Leidenfrost transition of jet fuels and bicomponent mixtures Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-13 Ryan Werner, Eric Mayhew, Kenneth Kim, Chol-Bum Kweon, James B. Michael
The regime during droplet impact with high temperature walls is important for understanding the generation of fuel vapor and the potential production of pollutants during fuel spray impingement events. Experimental data on regime behavior and associated surface contact, which is closely linked with the heat transfer during the event, are needed to validate models and simulations focused on vaporization
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Electric-field induced droplet stable vertical vibration: Experiments and numerical simulations Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-12 Ziqi Li, Yongzhou Luo, Rucheng Dai, Zhongping Wang, Xiaoyu Sun, Zengming Zhang
In this study, stable vertical vibration of a single droplet was stimulated through Electrowetting on Dielectric (EWOD) on a Polydimethylsiloxane-coated Indium Tin Oxide glass (PDMS-ITO) surface in an oil atmosphere. The mechanism of the vibration is clarified as a self-adjusted energy earning and losing equilibrium, and a small static force at the contact line is crucial for this stable vibration
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PIV measurements of coherent vortices and turbulence production inside acoustic liner cavity with offset slit Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-12 Yuchao Tang, Peng Wang, Yingzheng Liu
This paper reports an experimental investigation into the vortex dynamics purely excited by periodic acoustic waves within a slit–cavity structure, which is a typical unit element of an acoustic liner for aeroengine applications. Particle image velocimetry (PIV) was used to measure the instantaneous, time-averaged and phase-dependent flow dynamics inside the slit–cavity, which is exposed to high-intensity
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Calculating minimum droplet diameter in dripping, spindle, and cone-jet modes based on experimental data in the electrospray process Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-05 Shi Wang, Arian Yazdekhasti, As'ad Alizadeh, Ali Basem, Dheyaa J. Jasim, Ameer H. Al-Rubaye, Soheil Salahshour, Davood Toghraie
The paper is an experimental investigation of the effect of process parameters like applied voltage, volume flow rate and distance between two electrodes through dimensionless numbers in the electrospray process, droplet diameter in particular. In addition, this study attempts to present new estimated formulas based on experimental data to ease primary evaluations of droplet diameter before any performing
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The effect of metal foam fins on pool boiling of DI-water Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-03 Arthur Gomes da Silva Vilaronga, Leonardo Lachi Manetti, Sameer Sheshrao Gajghate, Jeferson Diehl de Oliveira, Elaine Maria Cardoso
The technology industry's growth has motivated the development of optimized thermal control techniques, such as pool boiling. Different surface designs have been developed to enhance the heat transfer coefficient in different heat transfer applications. These designs aim to improve thermal performance, increase efficiency, and address specific challenges associated with heat exchange. Introducing porous
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Impact dynamics and solidification behaviour of a molten droplet on a flat surface at different Weber numbers Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-02 Raju Chowdhury, Mohammad Mainul Hoque, Geoffrey Evans, Tom Honeyands, Brian J. Monaghan, David Scimone, Subhasish Mitra
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Interaction of liquid films formed by two continuous jets impinging obliquely on a vertical wall Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-01-30 Sheng-ju Wang, Liang Guan, Xin-yuan Xu, Ming-yang Tan, Meng-yuan Liu, Wei-feng Li, Tian-liang Yao, Qing-guo Lin
The technology of liquid film by jet impingement is widely applied in aerospace, electronics and cleaning. In this paper, the spreading and evolution of the liquid films formed by two continuous jets impinging obliquely on a vertical wall are experimentally studied. The effects of the jet Weber number, jet inclination angle, nozzles spacing and angle between two jets on the films are examined. Results
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Force and vortex shedding characteristics of a circular cylinder with flexible splitter plates Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-01 Pingping Shen, Weiguo Zhao, Hongjun Zhang, Zhengdao Wang, Hui Yang, Yikun Wei
In this paper, flow past a circular cylinder with various lengths of flexible splitter plate attachment is experimentally investigated. The dynamic behaviors of flexible plates are closely related to the Reynolds numbers () and plate length. For cases of = 1 and = 1.5, the flexible plates enter deflection mode with the increase of e. For long flexible plates ( > 2.5), a large deformation and periodic
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An experimental investigation of adiabatic two-phase flow patterns in a slit microchannel with 1:800 aspect ratio Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-01 Yu.A. Dementyev, E.A. Chinnov, D.Yu. Kochkin, F.V. Ronshin, A.A. Evstrapov, V.S. Gusev, O.A. Kabov
To date, in the public domain there is a lot of experimental data on adiabatic two-phase flow in microchannels of various geometries (round, rectangular, square). However, microchannels with high aspect ratio (slit microchannels) remain poorly understood. In this article, an adiabatic two-phase flow in a slit microchannel with a height of 12.5 µm and width of 10 mm (aspect ratio 1:800) has been experimentally
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Experimental assessment of film cooling from cylindrical holes subject to particulate deposition Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-01 Xing Yang, Zihan Hao, Zhenping Feng
Particulate deposition has become a significant challenge of developing more efficient film cooling configurations for hot turbine components. To assess the influence of particulate deposition and to better understand the coupling effects of deposition evolution and film cooling, experimental simulations were conducted by injecting low-melting-point wax particles into a low-temperature wind tunnel
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Experimental investigation of permeability and Darcy-Forchheimer flow transition in metal foam with high pore density Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-01-26 Chuanwen Lv, Wei Li, Jiaxi Du, Jialin Liang, Huizhu Yang, Yonggang Zhu, Binjian Ma
Open-cell metal foams are a group of emerging porous materials with exceptionally large porosity that are becoming increasingly popular in a diverse range of applications such as heat exchanger and chemical reactors. However, the pressure drop characteristic of metal foam structure at high pore density remains largely unclear and unexplored. In this study, the permeabilities of 6 different copper foam
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Investigation of convective heat transfer in a cold flow pebble bed nuclear reactor using advanced pebble probe heat transfer sensor Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-01-22 Muhna Alshammari, Ahmed Alalou, Saud Aldawood, Binbin Qi, Muthanna H Al-Dahhan
The aim of this study was to investigate the local heat transfer coefficients between the pebbles and the coolant gas in a PBR using an advanced measurement technique that consists of a heated pebble probe, a micro-foil heat flux sensor mounted flush on the surface of the heated pebble probe, and a thermocouple in the center of the bed void in front the sensor. In this work, the local heat transfer
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Flight-ready Electrical Capacitance Tomography SMARTTS tank for use with cryogenics Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-01-20 M.D. Green, R. Foster-Turner, A. Hunt, A.M. Ramirez-Mancebo, S.C. Lieber, J.W. Hartwig, D. Moxey, A. Tafuni
The Atout SMARTTS (SMART Tanks for Space) system allows the propellant mass distribution in a storage vessel to be measured accurately under several motion and gravity conditions and at any fill level. Based on Electrical Capacitance Tomography (ECT), SMARTTS systems incorporate electrodes on the inside of the tank, electrical connections to these electrodes, and capacitance measurements. Interpretation
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Spreading and splashing of liquid film on vertical hot surface by inclined jet impingement Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-01-19 Bolin Hu, Ting Zhao, Zhehang Shi, Weifeng Li, Qingguo Lin, Haifeng Liu, Fuchen Wang
In this paper, the liquid film formed by inclined jet impingement on the vertical hot wall is investigated by a high-speed camera. The effects of the jet velocity (5.5 m/s ≤ u0 ≤ 14.6 m/s, 3804 ≤ Re ≤ 10098) and initial wall temperature (25 ℃≤T0 ≤ 250 ℃) on the spreading and splashing of the liquid film are explored. Although the jet velocity and initial wall temperature have little effect on the spreading
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A comprehensive review of boiling heat transfer characteristics of wettability patterned surface Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-01-18 Linfeng Xiang, Yindong Song, Dongshu Yang, Xiaofeng Yang, Kambiz Vafai
In recent years, studies on patterned surfaces with different local wettabilities have emerged and developed. A number of peculiar structures are the most promising topographic ones in simultaneously enhancing CHF and HTC due to their high efficiency, and compatibility with other strengthening methods. Many studies have attempted to explore the optimal expression of wettability patterned surfaces for
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Flow characteristics of dispersed two-phase flows in an 8 × 8 rod bundle Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-01-17 Meng Yu, Takashi Hibiki, Naofumi Tsukamoto, Shuichiro Miwa
Two-phase flows in rod bundles or tube bundles appear in heat transfer systems. The bundle-average (or one-dimensional) void fraction is a critical parameter in overall system design, performance evaluation, and safety assessment. Accurate bundle-average void fraction prediction requires a precise interfacial momentum transfer term formulated using the distribution parameter and drift velocity, two
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Identification of the flow pattern from the experimental pressure signal in horizontal pipes carrying two-phase flows Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-01-17 Daniely Amorim das Neves, Saon Crispim Vieira, Juliana Rangel Cenzi, Aline Souza de Paula, Marcelo Souza de Castro, Adriano Todorovic Fabro
Two-phase flow is common in many industrial applications, especially in oil–gas production and transportation. Identifying the configuration of the phases along the flow is extremely important since the way they are distributed dictates the behaviour of the gradient of pressure and quantities such as the heat transfer coefficients of the mixture, while also being relevant in outflow guarantee issues
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Evaporation and wetting behavior of water on the laser-textured silicon substrate Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-01-09 Jinxin Lai, Guang Chen, Qizheng Dong, Qiaoli Lin
It is important to elucidate the impact of surface micromorphology on the evaporation mechanism and behavior to design rational micromorphologies for enhancing/regulating evaporation. In this study, we investigated the wetting and evaporation behaviors of water droplets on monocrystalline silicon surfaces with concentric circular textures etched using a laser engraving system at varying spacing intervals
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Experimental analysis of the near-nozzle direct injection spray for gasoline and ethanol-gasoline blended fuels Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-01-09 Anurag Gaur, Kaushik Saha, Devinder Pal Ghai
The current work analyses the spray during the early stage of development in the near-nozzle region using a single-hole gasoline direct injection system for gasoline (G100) and ethanol-gasoline (E85) blended fuels. The present work combined a Galilean-type beam expander with an achromatic lens, using an LED light and a high-speed camera to visualize a magnified view of the near-nozzle microscopic aspect
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Laser interferometric detection of heat release rate perturbation field of acoustically perturbed laminar premixed flames Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-01-04 Xuanye Liang, Lijun Yang, Yue Zhang, Wei Hu, Yu Tian, Jingxuan Li
Laser interferometry, which was originally used to measure density perturbation, has been previously used to determine the heat release rate perturbation, which is a key factor in the analysis of combustion instability. However, its spatial accuracy is still unsatisfied. In the present work, an improved fringe Fourier analysis method is proposed to process the results obtained from the laser interferometry
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A novel method of accurately characterizing heat pipes using thermoelectric modules Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-01-04 Eoin Guinan, Jeff Punch, Colin Butler, Vanessa Egan
This study details an experimental method for the accurate and rapid thermal characterization of low-intermediate temperature heat pipes (<200 °C). The aim of this work was to provide a method of measuring the thermophysical characteristics of heat pipes while providing definitive uncertainty values that enable accurate performance estimations prior to implementation into electronic systems. To achieve
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Heat transfer in the melting of ice slurry during flow in a vertical slit channel Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-01-04 Beata Niezgoda-Żelasko
The article concerns the heat transfer process of ethanol ice slurry during downward and upward flow in a vertical slit channel (3x35.8x700 mm) under constant heat flux density conditions. Experimental studies were conducted for three initial concentrations of ethanol (Xvai = 10.5 %, 13.2 %, 15.8 %) and mass fractions of ice of 0 ≤ xs ≤ 30 %. For upward flow, heat transfer coefficients were 6–14 %
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Planar light induced fluorescence quenching oxygen diffusivity measurement near the gas–liquid interface in aqueous glycerol and aqueous propylene glycol Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2023-12-27 Sören J. Gerke, Georg Brösigke, Jens-Uwe Repke
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Onset of heterogeneous nucleation in pool boiling of HFE-7100 following rapid heating on a microscale heater Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2023-12-19 Amiav Lankry, Alex Koyfman, Herman D. Haustein, Yaakov Nir, Gennady Ziskind, Tali Bar-Kohany
Effective thermal management of electronics is crucial for maintaining their reliability, longevity, and optimal performance. As electronic devices become increasingly compact and powerful, the need to explore new and innovative methods for thermal management becomes ever more critical. Rapid transitions of power lead to temperature spikes (hotspots) of up to 100 K, and thus can dramatically increase
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Thermal structure of an aluminum-methane/air hybrid flame Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2023-12-23 Samuel Jeanjean, Justin Bertsch, Guillaume Legros, Christian Chauveau, Fabien Halter
The modification of our energetic mix is one of the crucial challenges to mitigate climate change. Various solutions are studied, and we will probably use most of them in the future. One of these solutions is metal combustion. Indeed, metals have important energy properties, and the combustion of metal powder does not produce greenhouse gases except NOx, and also generates oxides which can be extracted
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Investigation of the influence of the bluff-body temperature on a lean premixed DME/air flame approaching blowoff Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2023-12-20 Xiaoyang Wang, Kunpeng Liu, Chen Fu, Meng Wang, Juan Yu, Yingwen Yan, Jinghua Li, Xiaonan Ge, Yi Gao
In flames stabilized by a two-dimensional (2D) bluff body, the lean blowoff (LBO) limit can be extended by increasing the bluff-body temperature, which is verified experimentally in premixed dimethyl ether (DME)/air flames in this work. Two bluff-body temperatures of 573 K and 773 K are tested, respectively. High-speed OH* chemiluminescence (CL) imaging is applied to record the spatial distribution
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Patterns of turbulent flow structures over dune shaped bed features under the influence of downward seepage Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2023-12-20 Pradyumna Kumar Behera, Mahesh Patel, Vishal Deshpande, Bimlesh Kumar
The research presents an experimental investigation on change in streamwise flow velocity and turbulent characteristics over a fixed dune shaped bed feature, in the presence and absence of downward seepage. Streamwise velocity, Reynolds Shear Stress (RSS), turbulent intensities, and third order correlation profiles are presented along the flow depth at eleven locations over the dune. Amplification
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Dynamic behavior of droplet impacting on a moving surface Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2023-12-20 Dong Li, Yuhe Shang, Xin Wang, Jiafei Zhang
The research specifically analyzes the characteristics of the impacting droplet and its behavior on the moving surface. The experimental results demonstrate that the droplet impact can be divided into two stages: spreading and stretching. The surface shear force is found to play a decisive role in the droplet's dynamic behaviors. Specifically, the surface shear force inhibits liquid fingers at the
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Quench cooling of steel plates by reciprocating moving water jet impingement Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2023-12-20 Xiaoqiang Li, Weihao Xia, Kai Yang, Longfei Dai, Feng Wang, Qian Xie, Jiajia Cai
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Impact of pilot flame and hydrogen enrichment on turbulent methane/hydrogen/air swirling premixed flames in a model gas turbine combustor Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2023-12-18 F. Pignatelli, D. Sanned, S. Derafshzan, R.Z. Szasz, X.S. Bai, M. Richter, A. Ehn, D. Lörstad, P. Petersson, A.A. Subash
This work investigates the impact of pilot flame and fuel composition on the structures and stabilization of swirling turbulent premixed methane/hydrogen/air flames in a lab-scale gas turbine model combustor. Simultaneous measurements of the velocity field and OH radicals distribution in the combustor were conducted using particle imaging velocimetry (PIV) and planar laser-induced fluorescence (PLIF)
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Generation of microbubbles at high gas concentrations via cavitation Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2023-12-12 Kristen Morse, Christopher J. Hogan, Demetris Yannopoulos, James D. Van de Ven
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Study on the prediction method of ultra-micro adhesive transfer ratio based on controlling the change of physical parameters Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2023-12-08 Xi Chen, Huifang Liu, Xin Cong, Xuan Luo, Xingfu Yu, Zhanqi Liu, Yunlong Chang
Nowadays, there has been some development in micro/nano manufacturing technology, but many micro/nano components have not yet been applied as products in practice. This is because the application of ultra-micro encapsulation technology in the micro/nano field is one of the main obstacles. Ultra-micro encapsulation needs to reach the nL (10-9L) level. However, there are some problems with methods that
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Comprehensive analysis method of acquiring wall heat fluxes in rotating detonation combustors Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2023-12-06 Yingchen Shi, Yongbo Zhang, Haocheng Wen, Bing Wang
Accurate perception of the combustor thermal environment is crucial for thermal protection design of a rotating detonation combustor (RDC). In this study, a comprehensive analysis method is established to calculate the non-uniform heat flux distribution of the RDC by utilizing the measured temperature distribution of the combustor outer wall obtained by the high-speed infrared thermal imager. Firstly
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Low-frequency large-scale unsteadiness analysis of lateral jet interactions on a slender cylinder in hypersonic flows using fast-responding pressure-sensitive paint Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2023-12-05 Xu Liu, Jun Zhong, Zhe Dong, Xiaohua Fan, Dongyang Zou, Yingzheng Liu, Di Peng
Lateral jet interactions, commonly encountered in high-speed vehicles, are typical complex three-dimensional (3D) shock wave/boundary layer interactions. The spatiotemporal features of surface pressure are crucial for understanding such complex interactions. In this study, fast-responding pressure-sensitive paint measurements are implemented at a sampling rate of 3000 Hz and a spatial resolution of
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Detailed turbulent structures investigation around piers group induced flow Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2023-12-04 Nima Ikani, Jaan H. Pu, Shuyan Zang, Ebrahim Hamid Hussein Al-Qadami, Adib Razi
This paper aims to investigate the mean velocities and turbulence characteristics, which include Reynolds shear stresses (RSS) and turbulent intensities, in order to study temporal and spatial flow patterns around a complex three square-piers group. Measurements have been performed by acoustic Doppler velocimeter (ADV) to identify turbulence flow structures alteration and vortices formation in longitudinal
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Dynamic stall characteristics of unswept pitching wing Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2023-11-29 Al Habib Ullah, Charles Fabijanic, Jordi Estevadeordal
An experimental investigation of dynamic stall on upswept pitching wing was conducted using Particle Image Velocimetry (PIV) and Pressure Sensitive Paint (PSP) techniques. The wing had an aspect ratio AR = 4 and a NACA 0012 airfoil section profile assembled with a round-tip. The wing motion of interest in this study is pitching at a certain angle of attack range and the wing was robustly designed and
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Impact characteristics of high-temperature alumina droplets on a cold wall: Rebound and adhesion Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2023-11-28 Gen Zhu, Jiang Li, Zhihao Li, Bozhi Hu, Kang Li, Oupeng Yan
The adhesion and rebound characteristics of alumina droplets in solid rocket motors are important for accurate prediction of slag deposition. This paper develops an experimental system for high-temperature alumina droplets impacting the wall. The system uses induction furnace to melt the alumina and use argon to squeeze the liquid alumina to obtain high-temperature alumina droplets. The particle diameter
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In situ multi-perspective scanning of 3D particle deposition on flat plates with film cooling and determination of practical model parameters Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2023-11-24 Tianlun Zhang, Zhe Dong, Weichen Huang, Wenwu Zhou, Wei Tian, Di Peng, Yingzheng Liu
A practical strategy for three-dimensional morphology measurement in the particle deposition process is of great importance to deepen the understanding of deposition physical processes. Due to the methodology limitations, it is difficult to obtain the formation process of deposition morphology. In this work, an in situ multi-perspective scanning (MPS) method using structured light was developed to
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Experimental investigation on droplet evolutions in co-flow around the bluff body Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2023-11-21 Hongbing Ding, Xinyu Song, Jinxia Li, Chuang Wen, Hongjun Sun, Zhihua Bao, Xixi Liu
Annular mist flow widely exists in natural gas and other engineering fields. Vortex flowmeter has gradually become an effective means of wet gas measurement. However, the droplets in the flow field will influence the stability of the vortex. In this paper, the interaction between droplets and vortex was studied by experiments. A novel in-focus criterion was proposed to improve the accuracy of droplet
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Development of Two-Color pyrometry for flame impingement on oxidized metal surfaces Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2023-11-24 Chia-Hsin Yeh, Yao-Hsien Liu
Measuring the temperature on a metal surface exposed to flame impingement is valuable for studying heat transfer. In this study, a non-intrusive two-color pyrometry was developed. It utilized visible light cameras to measure the two-dimensional temperature distribution on different metal surfaces. The experiment involved measuring the temperature distribution of metals (stainless steel, titanium, molybdenum)
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Investigating the non-flash-boiled hydraulic characteristics of superheated liquid hydrocarbon supply using multiple injectors Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2023-11-22 Juhyun Bae, Hojin Choi
An experimental study was conducted using a simple and novel experimental setup to investigate the non-flash-boiled supply of superheated hydrocarbons injected into a cavity-based combustor at varying fuel flow rates. The liquid hydrocarbon was steadily supplied via an isometric pump, heated to approximately 550 K using an induction heater, and sprayed upstream of the cavity through five identical
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Investigation of gas-bubbles separation from a liquid–gas mixture stream around a vertical 180° bend applied to gravity-driven separation using computing vision and computational fluid dynamics (CFD) Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2023-11-19 Jorge Lopez, Redza Rosli, Nicolas Ratkovich, Rafael H Nemoto, Eduardo Pereyra, Cem Sarica
Separators are essential to many gas–liquid systems, especially to purge bubbles before the fluids enter specific equipment such as pumps or heat exchangers. Gravity, drag, buoyancy, and other forces exerted by the liquid over the bubbles are responsible for the separation process. A detailed analysis of the behavior of bubbles inside a separator is necessary to understand and improve the separation
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Magnetic dopant and field effects on the heat discharge of organic PCM based lauric acid Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2023-11-19 Yunita Anggraini, Akhmad Yusuf, Sparisoma Viridi, Daniel Kurnia, Surjamanto Wonorahardjo, Inge Magdalena Sutjahja
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Analysis of pulse combustion processes and thermodynamic cycles in pulse combustors Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2023-11-14 Aiqi Zhang, Linyun Xu, Jing Jin, Yuzhu Wu, Yanyan Wang
This study explores the dynamic behavior of pulsating combustors during stable operation, examining pressure characteristics, flame dynamics, and thermodynamic cycles. Through analysis of pressure signal derivatives and high-speed photography, it unveils a distinctive counterclockwise thermodynamic cycle in these combustors, diverging from prior research. Crucial points in the combustion process, including
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Diffusive–layered convection in Y-shaped continuous-flow microreactor Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2023-11-13 E. Mosheva, I. Krasnyakov
Efficient and rapid mixing of fluids in continuous-flow microfluidic devices plays an important role in a wide range of applications. Although there are many different methods to enhance mixing in such reactors, the potential of natural convection to mix fluids has been overlooked because of its possible limitations at the microscale. Recent studies have challenged this statement by demonstrating the