Article
Thermodynamics
Yu Huang, Zhongkai Bao, Lunbo Duan, Yuanqiang Duan
Summary: This study investigates the heat transfer characteristics of immersed horizontal tubes under high-temperature and high-pressure conditions in a pressurized fluidized bed furnace. Experimental results show improved heat transfer with increased pressure and temperature, with radiation heat transfer increasing significantly as bed temperature rises. The proposed model accurately predicts experimental data points with an absolute average deviation of 11.86%.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Zhanghao Wan, Shiliang Yang, Jianhang Hu, Guirong Bao, Hua Wang
Summary: A three-dimensional multiphase particle-in-cell model is established to study hydrodynamics and thermochemical characteristics during the methanol-to-olefin (MTO) process in a fluidized bed reactor. The results show that particles in the reactor have heterogeneous velocity, temperature, and heat transfer coefficient distributions. Increasing the methanol to catalyst ratio and wall temperature promotes olefin production.
Article
Thermodynamics
Dongfang Li, Kyeongho Kim, Minwoo Kim, Yijie Zeng, Zhongzhi Yang, Sangho Lee, Xiaofeng Lu, Chung-Hwan Jeon
Summary: This study investigated the effect of particle size on bed-to-surface heat transfer in a bubbling FBHE of a 550 MWe ultra-supercritical CFB boiler. Experimental results showed that heat transfer coefficient increases with decreasing particle sizes. Improving cyclone efficiency to achieve finer particle size can enhance heat transfer in FBHE.
Article
Chemistry, Applied
Dongfang Li, Qikang Deng, DoHoon Lee, Chung-hwan Jeon
Summary: An artificial neural network model was developed to estimate the attrition rate coefficient Kaf of a circulating fluidized bed combustor, and field tests burning different coal blending ratios verified the validity of the model.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Energy & Fuels
Ronny Gueguen, Guillaume Sahuquet, Michael Tessoneaud, Jean-Louis Sans, Emmanuel Guillot, Alex Le Gal, Roger Garcia, Samuel Mer, Adrien Toutant, Francoise Bataille, Gilles Flamant
Summary: Using particles as heat transfer fluid in solar receivers can improve the efficiency of solar power plants. In this study, olivine particles were used in a one-tube mock-up to investigate the fluidization regimes and wall heat transfer. The experiments demonstrated that the system could tolerate high solar flux densities and showed high controllability and flexibility. The particle temperature increase and wall-to-particle heat transfer coefficient were found to be influenced by the particle mass flux.
Article
Engineering, Chemical
Ronny Gueguen, Samuel Mer, Adrien Toutant, Francoise Bataille, Gilles Flamant
Summary: The particle-in-tube solar receiver concept for solar towers involves using fluidized particles as heat transfer fluids. Experiments conducted with a single tube irradiated by concentrated solar energy show that the limits and size of the turbulent fluidization regime decrease with temperature, as does the particle volume fraction. The intensity of the wall-to-particle heat transfer is also affected by the fluidization regime.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Energy & Fuels
Diana Carolina Guio-Perez, Filip Johnsson, David Pallares
Summary: This study used Magnetic Particle Tracking (MPT) to investigate solid fuel conversion in fluidized bed reactors. The results showed that increasing bed height improves solid mixing, with fluidization velocity having a higher sensitivity.
Article
Thermodynamics
Min Ji Lee, Suyoung Kim, Sung Won Kim
Summary: This study investigated the wall-to-bed heat transfer characteristics of multi-walled carbon nanotubes in a fluidized bed. Different shapes of carbon nanotube particles led to different gas channeling phenomena, which affected the bed hydrodynamics. The heat transfer coefficient increased with gas velocity, and the shape of the nanotubes influenced the rate of increase.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Environmental
Hao Luo, Xiaobao Wang, Xiaoqin Wu, Lukasz Niedzwiecki, Halina Pawlak-Kruczek, Xinyan Liu, Qingang Xiong
Summary: The multi-fluid model is commonly used to study heat transfer between gas and solid in bubbling fluidized beds, but it is difficult to implement a one-dimensional model considering intra-particle temperature inhomogeneity. To solve this issue, a corrected coefficient is introduced to quantitively feature the effects of intra-particle temperature inhomogeneity on external heat transfer, forming a corrected zero-dimensional model. The results show that the corrected model predicts the temperature profiles more accurately and has comparable computational efficiency compared to the original model.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Ruixu Wang, Ziliang Wang, Xiaotao Bi, C. Jim Lim, Shahabaddine Sokhansanj
Summary: A prototype horizontal pulsed fluidized bed (HPFB) was constructed for continuous biomass torrefaction in this study. The solids residence time distribution (RID) of hemlock sawdust in the HPFB reactor was measured to investigate particle transport and mixing. The experimental results showed that the horizontal dispersion coefficients in the HPFB were influenced by weir height, gas pulsation frequency, solids feed rate, and gas velocity. The obtained horizontal solids dispersion coefficients in the HPFB were significantly smaller than values calculated by literature correlations.
Article
Thermodynamics
Dabiao Wang, Shizhang Guo, Yuan Zhao, Sichong Li, Lanlan Li
Summary: The heat transfer of supercritical R134a in a horizontally internally ribbed tube was predicted using a back propagation artificial neural network (ANN). The ANN was trained based on 4440 experimental data points and compared with traditional classical correlations. The results showed that the ANN had higher prediction accuracy and provided a useful reference for heat transfer prediction and design in supercritical fluid heaters.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Zhanghao Wan, Shiliang Yang, Jianhang Hu, Hua Wang
Summary: This study investigates the multiphase flow and thermochemical characteristics in a commercial-scale methanol-to-olefin (MTO) fluidized bed reactor using a three-dimensional multiphase particle-in-cell model. The research reveals the non-uniform gas-solid distribution and turbulent fluidization regime in the reactor. Additionally, the width of particle size distribution (PSD) is found to have a significant impact on reactor performance.
Article
Thermodynamics
J. I. Corcoles, A. Acosta-Iborra, J. A. Almendros-Ibanez
Summary: This study presents a 2-D numerical simulation of a freely bubbling fluidized bed with immersed surfaces using the CPF D model, showing different heat transfer mechanisms depending on the immersed surface geometries. The results indicate that CPFD-Barracuda is able to properly simulate heat transfer and bed dynamics, especially in defluidized regions where the two-fluid model fails.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Hanyu Jin, Qiang Wu, Shuai Wang, Yurong He
Summary: In this study, the mass and heat transfer behaviors of ellipsoid wet particles in a fluidized bed dryer were investigated using the CFD-DEM method. The heat transfer mechanisms caused by contact, convection, and liquid bridge were analyzed. The study found that a reduction in liquid content weakens the heat flow between particles, and the agglomeration of non-spherical particles during the drying process leads to a lower drying rate.
APPLIED THERMAL ENGINEERING
(2024)
Article
Engineering, Chemical
Jikang Han, Jiahao Fang, Ting Yang, Peng Chen, Taishan Liu, Yanfeng Li
Summary: Analysis of the particle movement is necessary for the design, optimization, and scale-up of the new three-phase fluidized bed flotation column (TFC). In this study, the motion and distribution of assisted fluidized particle-glass spheres in the TFC were examined, and particle velocities were quantified to better assess particle collision and dispersion behavior. A correlation model for particle velocity in a three-phase fluidized bed was proposed, covering a wide range of operating parameters. Particle collision frequencies and dispersion coefficients were also investigated, leading to the development of a new method for estimating dispersion due to particle motion.
ADVANCED POWDER TECHNOLOGY
(2023)
Article
Thermodynamics
L. V. Kamble, D. R. Pangavhane, T. P. Singh
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2015)
Article
Thermodynamics
L. V. Kamble, D. R. Pangavhane, T. P. Singh
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME
(2015)
Review
Materials Science, Multidisciplinary
Ravi Sekhar, T. P. Singh
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2015)
Article
Engineering, Mechanical
Sanjeev Kumar, Rupinder Singh, Ajay Batish, T. P. Singh, Rajdeep Singh
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2017)
Article
Engineering, Mechanical
Sanjeev Kumar, Ajay Batish, Rupinder Singh, T. P. Singh
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2017)
Article
Engineering, Mechanical
Sanjeev Kumar, Rupinder Singh, Ajay Batish, T. P. Singh
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2017)
Article
Engineering, Chemical
T. P. Singh, Vijaykumar S. Jatti
PARTICULATE SCIENCE AND TECHNOLOGY
(2015)
Article
Engineering, Mechanical
Sudhir Kumar, Rupinder Singh, T. P. Singh, Ajay Batish
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2019)
Article
Engineering, Industrial
Amol Macchindra Dalavi, Padmakar Jagannath Pawar, Tejinder Paul Singh
MANAGEMENT AND PRODUCTION ENGINEERING REVIEW
(2018)
Proceedings Paper
Materials Science, Multidisciplinary
Omkar M. Patil, Nitin N. Khedkar, T. S. Sachit, T. P. Singh
MATERIALS TODAY-PROCEEDINGS
(2018)
Article
Engineering, Multidisciplinary
Sanjeev Kumar, Rupinder Singh, Ajay Batish, T. P. Singh
INDIAN JOURNAL OF ENGINEERING AND MATERIALS SCIENCES
(2017)
Proceedings Paper
Materials Science, Multidisciplinary
A. B. Auti, D. R. Pangavane, T. P. Singh, Mandar Sapre
MATERIALS TODAY-PROCEEDINGS
(2017)
Article
Engineering, Multidisciplinary
A. B. Ubale, D. Pangavhane, A. Auti
JOURNAL OF ENGINEERING SCIENCE AND TECHNOLOGY
(2017)
Article
Computer Science, Interdisciplinary Applications
Amol M. Dalavi, Padmakar J. Pawar, Tejinder Paul Singh
JOURNAL OF COMPUTATIONAL DESIGN AND ENGINEERING
(2016)
Article
Engineering, Multidisciplinary
Amol M. Dalavi, Padmakar J. Pawar, Tejinder P. Singh
ENGINEERING REVIEW
(2016)
Article
Thermodynamics
Mahsa Taghavi, Swapnil Sharma, Vemuri Balakotaiah
Summary: This study investigates the natural convection effects in the insulation layers of spherical storage tanks and their impact on the tanks' performance. The permeability and Rayleigh number of the insulation material are considered as key factors. The results show that as the Rayleigh number increases, new convective cells emerge and cause the cold boundary to approach the external hot boundary. In the case of large temperature differences, multiple solutions may coexist.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyang Xu, Fangjun Hong, Chaoyang Zhang
Summary: This study introduces a self-induced jet impingement device for enhancing pool boiling performance in high power electronic cooling. Through visualization and parametric investigations, the effects of this device on pool boiling performance are studied, revealing the promotion of additional liquid supply and vapor exhausting. The flow rate of the liquid jet is found to positively impact boiling performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Wenchao Ke, Yuan Liu, Fissha Biruke Teshome, Zhi Zeng
Summary: Underwater wet laser welding (UWLW) is a promising and labor-saving repair technique. A thermal multi-phase flow model was developed to study the heat transfer, fluid dynamics, and phase transitions during UWLW. The results show that UWLW creates a water keyhole, making the welding environment similar to in air laser welding.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Xingrong Lian, Lin Tian, Zengyao Li, Xinpeng Zhao
Summary: This study investigates the heat transfer mechanisms in natural fiber-derived porous structures and finds that thermal radiation has a significant impact on the thermal conductivity in low-density regions, while natural convection rarely occurs. Insulation materials derived from micron-sized natural fibers can achieve minimum thermal conductivity at specific densities. Strategies to lower the thermal conductivity include increasing porosity and incorporating nanoscale pores using nanosize fibers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Yasir A. Malik, Kilian Koebschall, Stephan Bansmer, Cameron Tropea, Jeanette Hussong, Philippe Villedieu
Summary: Ice crystal icing is a significant hazard in aviation, and accurate modeling of sticking efficiency is essential. In this study, icing wind tunnel experiments were conducted to quantify the volumetric liquid water fraction, sticking efficiency, and maximum thickness of ice layers. Two measurement techniques, calorimetry and capacitive measurements, were used to measure the liquid water content and distribution in the ice layers. The experiments showed that increasing wet bulb temperatures and substrate heat flux significantly increased sticking efficiency and maximum ice layer thickness.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinqi Hu, Tongtong Geng, Kun Wang, Yuanhong Fan, Chunhua Min, Hsien Chin Su
Summary: This study experimentally examined the heat dissipation of vibrating fans and demonstrated its inherent mechanism through numerical simulation. The results showed that the flow fields induced by the vibrating blades exhibited pulsating features and formed large-scale and small-scale vortical structures, significantly improving heat dissipation. The study also identified the impacts of different blade structures and developed a trapezoidal-folding blade, which effectively reduced the maximum temperature of the heat source and alleviated high-temperature failure crisis.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Dan-Dan Su, Xiao-Bin Li, Hong-Na Zhang, Feng-Chen Li
Summary: The boiling heat transfer of low-boiling-point working fluid is a common heat dissipation technology in electronic equipment cooling. This study analyzed the interfacial boiling behavior of R134a under different conditions and found that factors such as the initial thickness of the liquid film, solid-liquid interaction force, and initial temperature significantly affect the boiling mode and thermal resistance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyi Wu, Dongke Sun, Wei Chen, Zhenhua Chai
Summary: A unified lattice Boltzmann-phase field scheme is proposed to simulate dendrite growth of binary alloys in the presence of melt convection. The effects of various factors on the growth are investigated numerically, and the model is validated through comparisons and examinations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shaokun Ge, Ya Ni, Fubao Zhou, Wangzhaonan Shen, Jia Li, Fengqi Guo, Bobo Shi
Summary: This study investigated the temperature distribution of main cables in a suspension bridge during fire scenarios and proposed a prediction model for the maximum temperature of cables in different lane fires. The results showed that vehicle fires in the emergency lane posed a greater thermal threat to the cables.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shuang-Ying Wu, Shi-Yao Zhou, Lan Xiao, Jia Luo
Summary: This paper investigates the two-phase flow and heat transfer characteristics of low-velocity jet impacting on a cylindrical surface. The study reveals that the heat transfer regimes are non-phase transition and nucleate boiling with the increase of heat transfer rate. The effects of jet impact height and outlet velocity on local surface temperatures are pronounced at the non-phase transition stage. The growth rates of heat transfer rate and liquid loss rate increase significantly from the non-phase transition to nucleate boiling stage.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Emad Hasani Malekshah, Wlodzimierz Wlodzimierz, Miros law Majkut
Summary: Cavitation has significant practical importance and can be controlled by air injection. This study investigates the natural to ventilated cavitation process around a hydrofoil through numerical and experimental methods. The results show that the location and rate of air injection have a meaningful impact on the characteristics of cavitation.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Feriel Yahiat, Pascale Bouvier, Antoine Beauvillier, Serge Russeil, Christophe Andre, Daniel Bougeard
Summary: This study explores the enhancement of mixing performance in laminar flow equipment by investigating the generation of chaotic advection using wall deformations in annular geometries. The findings demonstrate that the combined geometry can achieve perfect mixing at various Reynolds numbers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Hui He, Ning Lyu, Caihua Liang, Feng Wang, Xiaosong Zhang
Summary: This study investigates the condensation, frosting, and defrosting processes on superhydrophobic surfaces with millimeter-scale structures. The results reveal that the structures can influence the growth and removal of frost crystals, with the bottom grooves creating a frost-free zone and conical edges promoting higher frost crystal heights. Two effective methods for defrosting are observed: hand-lifting the groove and airfoil retraction contraction on protruding structures. This research provides valuable insights into frost formation and defrosting on millimeter-structured superhydrophobic surfaces, with potential applications in anti-frost engineering.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Thiwanka Arepolage, Christophe Verdy, Thibaut Sylvestre, Aymeric Leray, Sebastien Euphrasie
Summary: This study developed two thermal concentrators, one with a 2D design of uniform thickness and another with a 3D design, using the coordinate transformation technique and metamaterials. By structuring the thermal conductor, the desired local density-heat capacity product and anisotropic thermal conductivities were achieved. The homogenized thermal conductivities were obtained from finite element simulations and cylindrical symmetry consideration. A 3D concentrator was fabricated using 3D metal printing and characterized using a thermal camera. Compared to devices that solely consider anisotropic conductivities, the time evolution characteristics of the metadevice designed with coordinate transformation were closer to those of an ideal concentrator.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Liangyuan Cheng, Qingyang Wang, Jinliang Xu
Summary: In this study, we investigated the supercritical heat transfer of CO2 in a horizontal tube with a diameter of 10.0 mm, covering a wide range of pressures, mass fluxes, and heat fluxes. The study revealed a non-monotonic increase in wall temperatures along the flow direction and observed both positive and negative wall temperature differences between the bottom and top tube. The findings were explained by the thermal conduction in the solid wall interacting with the stratified-wavy flow in the tube.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)