Article
Thermodynamics
Anil Kumar, Masood Ashraf Ali, Rajesh Maithani, Naveen Kumar Gupta, Sachin Sharma, Sunil Kumar, Lohit Sharma, Robin Thakur, Tabish Alam, Dan Dobrota, Sayed M. Eldin
Summary: This research paper presents an experimental analysis on a heat exchanger tube using a newly designed perforated conical ring combined with twisted tape as inserts. The investigation analyzes various geometric and flow parameters and establishes empirical correlations for the Nusselt number and the friction factor.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Hrishiraj Ranjan, Sujoy Kumar Saha
Summary: This study numerically investigates the hydro-thermal characteristics of transverse ribs combined with helical screw tape inserts in square duct and compares the findings with limited experimental results. The results show that the present configuration produces good mixing and enhanced boundary layer separation. The Nusselt number and friction factor increase with an increase in rib height and Reynolds number, while they decrease with an increase in rib pitch and screw tape parameter value.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Green & Sustainable Science & Technology
Reza Roohi, Amir Arya, Masoud Akbari, Mohammad Javad Amiri
Summary: Improving the performance of renewable energy harvesters is crucial and complex. Parabolic solar collectors are considered one of the most promising and commonly used devices among renewable energy harvesters. Researchers are focusing on optimizing the performance of Parabolic Trough Collectors (PTCs), including increasing the heat flux absorption by the absorber tubes. The implementation of helical screw tape (HST) and nanofluids has proven to be effective in overcoming this issue.
Article
Green & Sustainable Science & Technology
Aneeq Raheem, Waseem Siddique, Zaryab H. Farooqui, Tareq Salameh, Inam-ul Haq, Khalid Waheed, Kamran Qureshi
Summary: Solar energy is crucial due to population growth and global warming, with Parabolic Trough Collectors being widely used for various purposes. The use of helical screw tape inserts in circular tubes can enhance efficiency, and a parametric study revealed optimal values for thickness, helix angle, and inner diameter. Modifying inserts with holes or fins can increase pressure drop slightly, while a tapered-helix design can reduce pressure drop at the expense of decreased Nusselt number. Increasing Performance Evaluation Criteria will be an effective step towards a cleaner environment for Parabolic Trough Collectors.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Chemical
Yun Zhang, Xiaojie Xu
Summary: The study developed a Gaussian process regression model to investigate the statistical relationship among temperature, specific heat capacities of nanoparticles and base liquids, nanoparticle volume concentrations, and specific heat capacities of nanofluids. The model is accurate, stable, and applicable to a wide range of nanofluid compositions and temperatures, providing fast and low-cost estimations of specific heat capacities.
Article
Chemistry, Multidisciplinary
Omer A. A. Alawi, Haslinda Mohamed Kamar, Mayadah W. W. Falah, Omar A. A. Hussein, Ali H. H. Abdelrazek, Waqar Ahmed, Mahmoud Eltaweel, Raad Z. Z. Homod, Nadhir Al-Ansari, Zaher Mundher Yaseen
Summary: Mono, hybrid, and ternary nanofluids were tested in plain and twisted-tape pipes using k-omega shear stress transport turbulence models. The thermal performance and pressure drop of different nanofluids were compared at varying Reynolds numbers. Results showed that the twisted pipe had a higher outlet temperature and better energy utilization than the plain pipe. SiO2/DW exhibited improved heat transfer performance and reduced pressure drop at Re = 9,000. Overall, nanofluids showed superior thermohydraulic performance compared to distilled water, with DW having a higher thermohydraulic efficiency at Re = 15,000.
NANOTECHNOLOGY REVIEWS
(2023)
Article
Thermodynamics
Hatice Simsek
Summary: This study analytically measures the fully developed laminar flow and heat transfer of water-based nanofluids with Cu, CuO, and Al2O3 nanoparticles within a micropipe. The findings suggest that adding nanoparticles to the flow area significantly affects the velocity field and heat transfer, with Cu showing the highest heat transfer enhancement among the studied nanofluids.
Article
Thermodynamics
Sameh A. Nada, R. M. El-Zoheiry, M. Elsharnoby, O. S. Osman
Summary: This study conducted a comprehensive experimental investigation on the thermal performance of electronic devices using liquid cooling systems. The results showed that heat sinks with serpentine mini-channels outperformed those with wavy and parallel mini-channels. The presence of nanoparticles in the coolant improved the thermal performance, with CuO-water nanofluid performing better than Al2O3-water nanofluid.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Yongfeng Ju, Tiezhu Zhu, Ramin Mashayekhi, Hayder Mohammed, Afrasyab Khan, Pouyan Talebizadehsardari, Wahiba Yaici
Summary: Increasing the number of semi-twisted tapes in a heat exchanger pipe leads to enhancement in heat transfer and friction factor, which is significant for heat exchange using nanofluids.
Article
Thermodynamics
Santinath Bairagi, Ranendra Roy, Bijan Kumar Mandal
Summary: This study conducts a numerical investigation on the heat transfer properties of water-based Al2O3 nanofluids flowing through circular tubes, both with and without twisted tape inserts. The results show that twisted tape significantly enhances the heat transfer rate, while the nanofluid alone only provides a modest improvement. The friction factor increases with the nanoparticle volume fraction, but the effect on heat transfer rate is more pronounced. The best thermohydraulic performance is achieved with a 5% volume fraction of nanoparticles and twisted tape inserts.
JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS
(2023)
Article
Thermodynamics
Zihao Xuan, Shuang Wang, Yuling Zhai, Hua Wang
Summary: The presence of suspended particles in ternary nanofluids led to a shift in the transition regime to a lower Reynolds number. As the Reynolds number increased, the heat transfer performance showed a fluctuating upward trend with a maximum value at Re = 5250. In addition, the ternary nanofluid with a mixing ratio of 30:30:40 exhibited a higher Nusselt number compared to the base fluid, while the CuO/W and Al2O3/W nanofluids showed lower enhancements. Finally, a mixing ratio of 30:50:20 was determined to be the optimum for the convective heat transfer process based on thermodynamic analysis.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Kamel Adnan, Kamel Guedri, Zehba Raizah, Elsayed Tag-Eldin, Waqas Ashraf, Umar Khan, Ahmed M. Galal
Summary: Heat transfer and energy storage are core challenges for industrialists and engineers. Nanofluids and hybrid nanofluids have been introduced as new heat transfer fluids, and a third generation called modified hybrid nanofluids (MHNs) has recently been developed. In this study, the energy storage efficiency of (Al2O3-CuO-Cu/H2O)(mhnf) and (Al2O3-CuO/H2O)(hnf) was investigated, revealing that (Al2O3-CuO-Cu/H2O)(mhnf) has higher thermal energy storage efficiency than traditional nanofluids and hybrid nanofluids. These findings provide new insights into heat transfer and can help address energy storage challenges in the modern technological world.
FRONTIERS IN CHEMISTRY
(2022)
Article
Chemistry, Physical
Binbin Xu, Honglie Shen, Yajun Xu, Jiawei Ge, Shun Wang, Qichen Zhao, Binkang Lai
Summary: In this work, inverted-pyramid light trapping texture on industrial-sized p-type silicon was prepared using a rapid and repeatable one-step Cu-MACE process at room temperature. Various TMOs-Si heterojunction photodetectors were fabricated, with a high-performance NIR PD demonstrated through optimizing device structure and layer thickness. The study paves the way for mass production of TMOs-Si heterojunction PDs using inverted-pyramid textured silicon.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Thermodynamics
M. E. Nakhchi, J. A. Esfahani
Summary: The turbulent characteristics and thermal enhancement of CuO-water nanofluids through heat exchangers with double V-cut twisted tapes were investigated numerically. The results showed that the modified twisted tapes with cuts led to strong turbulent kinetic energy and additional vortex flow, improving fluid mixing and heat transfer. A significant enhancement in heat transfer efficiency of about 14.5% was observed for the nanofluid with a volume fraction of phi=1.5%, reaching a maximum thermal performance of eta=1.99 at Re=5000.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Engineering, Chemical
Ali Akbar Abbasian Arani, Hossein Aberoumand
Summary: This study investigates the stagnation-point flow of hybrid Ag-CuO/water nanofluids over a stretching/shrinking sheet. Through numerical and stability analysis, it is found that there are dual solutions to the problem, which are connected to the shrinking rate. The friction factor and Nusselt number of the nanofluids show significant variations with the suction/injection parameter.
Article
Energy & Fuels
T. R. Preethivasani, T. Senthilkumar, M. Chandrasekar
Summary: This article investigated the use of waste transformer oil as an alternative fuel for diesel engines. The experimental results showed that blending transformer oil with diesel fuel improved thermal efficiency and reduced fuel consumption compared to traditional diesel operation.
Article
Energy & Fuels
J. Charles Franklin, M. Chandrasekar, D. Ansalam Mattius
Summary: This study experimentally determined the thermal and electrical performance of the solar PV panel in a PVT air system, using a self-developed data acquisition system. The system was tested in Tiruchirappalli, India, and the results indicated the effective working of the indigenously developed PV/PVT data acquisition system.
JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME
(2021)
Article
Thermodynamics
Solaimalai Raja Rakkappan, Suresh Sivan, B. Praveen, M. Naarendharan, P. Sai Sudhir
Summary: This study measured the heat of dissociation of tetra-n-butyl ammonium bromide semi-clathrate hydrates, as well as the thermal conductivity and specific heat of TBAB aqueous solutions and solidified solutions for various weight fractions. The experiment showed that diameter and wall temperature influenced charging and discharging performance, with higher diameter capsules providing better performance.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2021)
Article
Energy & Fuels
Vikesh Sathyamurthy, Sankar Gopalan, Sivan Suresh, Balasubramanian Karuppudayar Ramaraj, Santhosh Kumar Deenadayalan
Summary: Thermo gravimetric analysis (TGA) is widely used for estimating devolatilization rates and measuring char reactivity in coal. This study found that the most accurate method for analyzing TGA data for high-ash Indian coal is FWO.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2021)
Article
Thermodynamics
Mohamed Ibrahim N.H., M. Udayakumar, Sivan Suresh, Suvanjan Bhattacharyya, Mohsen Sharifpur
Summary: This study investigates the insights of soot formation in ethylene/hydrogen/nitrogen diffusion jet flame, including soot volume fraction as a function of flame-normalized length and various soot formation rates. The originality of this study lies in coupling LES turbulent model with chemical equilibrium diffusion combustion and conducting SVF and its insights study for different Reynolds number configurations.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2021)
Article
Thermodynamics
R. Anish, V Mariappan, S. Suresh, Mahmood Mastani Joybari, Ammar M. Abdulateef
Summary: The study investigates the use of thermal energy storage systems to address the intermittence of renewable energy sources, focusing on analyzing the heat transfer efficiency and performance of compact spiral coil thermal storage units. Experimental data shows that in this storage unit, the processes of heat storage and discharge of xylitol are mainly governed by natural convection and conduction, respectively.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Energy & Fuels
Krishnadass Karthick, S. Suresh
Summary: Solar thermoelectric power generation using Alumina Nano-Enhanced Phase Change Material and storing rejected heat in D-Mannitol helps in achieving continuous power output. Experimental results suggest that a composition of 99% D-Mannitol + 1% Alumina nanoparticle is optimal for various heat inputs and cooling methods, resulting in significantly higher TEG electrical power outputs compared to natural cooling methods.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2021)
Article
Thermodynamics
J. Charles Franklin, M. Chandrasekar, M. Sridharan
Summary: A new PVTa system with downstream wavy fins showed better thermal performance compared to a system with downstream longitudinal fins. Additionally, a fuzzy-based model was developed for predicting the thermal and electrical performance of the new solar PVTa collector with high accuracy.
JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS
(2021)
Article
Thermodynamics
Karthik Krishnaswamy, Suresh Sivan
Summary: The power output and efficiency of a gas turbine can be improved by using ribs that generate high Thermal Hydraulic Performance (THP) in cooling passages. Experimental results show that V and W-shaped ribs can effectively enhance heat transfer within a certain range of Reynolds numbers, with optimal performance observed at Reynolds number 40000.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Solaimalai Raja Rakkappan, Suresh Sivan, Shaik Naveed Ahmed, M. Naarendharan, P. Sai Sudhir
Summary: CPCM has a higher freezing temperature (around 4.1 degrees C), zero supercooling, and enhanced energy storage characteristics, ensuring efficient energy storage and recovery.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2021)
Article
Energy & Fuels
Cyril Reuben Raj, S. Suresh, Vivek Kumar Singh, R. R. Bhavsar, M. Chandrasekar, V Archita
Summary: This article introduces a synthesized manganese-based layered perovskite Solid-Solid PCM (SS-PCM) homogenized with 5 wt.% of nano-encapsulated liquid gallium-indium metal alloy (n-LMA) for energy storage applications, showing high stability, enhanced thermal conductivity, and increased energy storage performance.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Energy & Fuels
B. Karpanai Selvan, Soni Das, M. Chandrasekar, R. Girija, S. John Vennison, N. Jaya, P. Saravanan, M. Rajasimman, Yasser Vasseghian, N. Rajamohan
Summary: The study investigates the performance and emission characteristics of various biomass blends in a diesel engine. The results show that the AO10D blend performs well with higher thermal efficiency and lower emissions at 50% load.
Article
Energy & Fuels
M. Chandrasekar, T. Senthilkumar
Summary: This study investigated the thermal and electrical performance of pole mounted solar flat PV panels under different seasonal variations, aiming to reduce the dependency on grid-connected electricity generated from fossil fuels. Experimental measurements were conducted throughout the year 2016 in Tiruchirappalli, India, leading to the proposal of a correlation for predicting PV panel temperature.
INTERNATIONAL JOURNAL OF AMBIENT ENERGY
(2021)
Article
Thermodynamics
Abhay Lingayat, V. P. Chandramohan, V. R. K. Raju, S. Suresh
Summary: An indirect type solar dryer has been developed and analyzed in terms of its performance and drying kinetics for brinjal and tomato slices. The results show significant drying effects for both brinjal and tomato, with an average effective moisture diffusivity of 3.60 x 10(-9) and 4.00x 10(-9) m(2)/s, respectively.
HEAT AND MASS TRANSFER
(2021)
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)
