Xinlong Wang¹, Xiaohang Qu¹, Chuandong Lin^2,*

The International Conference on Computational & Experimental Engineering and Sciences, Vol.33, No.1, pp. 1-1, 2025, DOI:10.32604/icces.2025.011311

Abstract The lattice Boltzmann method (LBM) has been extensively utilized in various fields, including the droplet dynamics [1–4]. At present, significant challenges persist in accurately resolving interfacial dynamics during droplet collisions—including deformation [5], breakup process [6] and capturing microscale details [7] of contact line motion during droplet-wall interactions. In this work, the non-orthogonal multiple relaxation time lattice Boltzmann method is used to study droplets impacting superhydrophobic walls with different characteristic of surface protrusion. The horizontal displacement, maximum spreading length, and the contact time are probed in the process of droplet collisions under various conditions of Weber More >

Alexander A. Fedorets¹, Eduard E. Kolmakov¹, Anna V. Nasyrova¹, Dmitry N. Medvedev¹, Vyacheslav O. Mayorov², Vladimir Yu. Levashov², Leonid A. Dombrovsky^1,3,*

Frontiers in Heat and Mass Transfer, Vol.23, No.4, pp. 1091-1102, 2025, DOI:10.32604/fhmt.2025.068244 - 29 August 2025

Abstract A new experimental method is developed to investigate the effect of dissolved substances on the evaporation rate of small water droplets suspended in the atmosphere. The laboratory setup is based on converting a generated droplet jet of complex structure into a directed flow of evaporating droplets falling in a vertical tube. Images of falling droplets captured by a high-speed camera through a window in the vertical channel wall are used to determine the sizes and velocities of individual droplets. The computational modeling of droplet motion and evaporation proved useful at all stages of the experimental… More >

Ying Zhang^1,2, Chao Dang^1,2,*, Zhiqiang Zhang^1,2

Frontiers in Heat and Mass Transfer, Vol.23, No.4, pp. 1215-1242, 2025, DOI:10.32604/fhmt.2025.067373 - 29 August 2025

Abstract In this study, the flow boiling characteristics of R1234yf in parallel microchannels were experimentally investigated. The experiments were conducted with heat flux from 0 to 550 kW/m², mass flux of 434, 727, and 1015 kg/(m² s), saturation temperatures of 293, 298, and 303 K, and inlet sub-cooling of 5, 10, and 15 K. The analysis of the experimental results provides the following conclusions: a reduced mass flux and lower subcooling correspond to a diminished degree of superheat at the boiling inception wall; conversely, an elevated saturation temperature results in a reduced amount of superheat at the… More >

Zongyu Jie^1,2, Chao Dang^1,2,*, Qingliang Meng ^3,4

Frontiers in Heat and Mass Transfer, Vol.23, No.4, pp. 1053-1089, 2025, DOI:10.32604/fhmt.2025.066792 - 29 August 2025

Abstract With the increasing miniaturization of systems and surging demand for power density, accurate prediction and control of two-phase flow pressure drop have become a core challenge restricting the performance of microchannel heat exchangers. Pressure drop, a critical hydraulic characteristic, serves as both a natural constraint for cooling systems and determines the power required to pump the working fluid through microchannels. This paper reviews the characteristics, prediction models, and optimization measures of two-phase flow pressure drop for low-boiling-point working fluids in microchannels. It systematically analyzes key influencing factors such as fluid physical properties, operating conditions, channel… More >

Zichen Zhang^1,2, Aoyu Zhang¹, Tongtong Qi¹, Xiaoyan Ma^1,2,*

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.7, pp. 1601-1610, 2025, DOI:10.32604/fdmp.2025.067414 - 31 July 2025

Abstract This study experimentally investigates the oscillatory dynamics of wind-driven droplets using high-speed imaging to capture droplet profiles within the symmetry plane and to characterize their natural oscillation frequencies. Results reveal that the eigenfrequencies vary spatially due to distinct oscillation modes occurring at different droplet locations. Notably, the fundamental eigenfrequency decreases with reducing droplet volume, while droplet viscosity exerts minimal influence on this frequency. Prior to the onset of motion, the dynamic contact angle consistently remains between the advancing and receding angles. The inertial forces generated by droplet oscillation are found to be significantly greater than More >

Yan Xiong¹, Xiangnan Song¹, Jiawei Lu¹, Lei Liu², Yaru Yan³, Xuemin Ye^3,*

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.5, pp. 1063-1077, 2025, DOI:10.32604/fdmp.2025.063769 - 30 May 2025

Abstract Enhancing the fermentation efficiency of waste in waste warehouses is pivotal for accelerating the pyrolysis process and minimizing harmful gas emissions. This study proposes an integrated approach, combining hot air injection with dual atomizing nozzles, for the thermal treatment of waste piles. Numerical simulations are employed to investigate the influence of various parameters, namely, nozzle height, nozzle tilt angle, inlet air velocity and air temperature, on the droplet diffusion process, spread area, droplet temperature, and droplet size distribution. The results show that reducing the nozzle height increases the temperature of droplets upon their deposition on… More > Graphic Abstract

Rodolfo V. C. Ramalho¹, Vitoria B. Portilho¹, Davi E. S. Souza¹, Gilton C. A. Furtado¹, Natália M. Graças², Manoel J. S. Sena², Cláudio J. C. Blanco², André L. Amarante Mesquita^1,*

Energy Engineering, Vol.122, No.6, pp. 2197-2213, 2025, DOI:10.32604/ee.2025.064196 - 29 May 2025

Abstract Despite significant Brazilian social programs to expand energy access, approximately one million people in rural Amazonia still lack electricity. Moreover, the existing rural electricity grid in the region is inadequate for supporting efficient small-scale production systems due to both the poor quality and high cost of supplied energy. In parallel, traditional wooden bridges in the Amazon have been progressively replaced by more durable concrete structures in recent years. In this context, this study explores the application of very low-head hydropower installations in the Amazon, focusing on integrating axial-flow turbines beneath small concrete bridges. The methodology… More > Graphic Abstract

Zihan Ma^1,2, Yan Wu¹, Hongyan Wang^2,*, Shaofei Yuan², Jian Zhang²

Journal of Renewable Materials, Vol.13, No.5, pp. 931-955, 2025, DOI:10.32604/jrm.2025.02024-0040 - 20 May 2025

Abstract Herein, the surface of Moso bamboo was hydrophobically modified by combining O₂/N₂ plasma treatments with polydimethylsiloxane (PDMS) solution treatment as the hydrophobic solution. The effects of plasma treatment process (power and time), PDMS solution concentration, and maceration time on the hydrophobic performance of bamboo specimens were studied, and the optimal treatment conditions for improving the hydrophobicity were determined. Scanning electron microscopy (SEM), fourier transform infrared (FTIR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) were used to analyze the surface morphology, chemical structure, and functional groups in the specimens before and after the plasma and PDMS… More > Graphic Abstract

Ridha Djebali^1,*, Bernard Pateyron², Mokhtar Ferhi¹, Mohamed Ouerhani³, Karim Khemiri¹, Montassar Najari¹, M. Ammar Abbassi⁴, Chohdi Amri⁵, Ridha Ennetta⁶, Zied Driss⁷

Frontiers in Heat and Mass Transfer, Vol.23, No.2, pp. 441-461, 2025, DOI:10.32604/fhmt.2025.063375 - 25 April 2025

Abstract This paper investigates the application of Direct Current Atmospheric Plasma Spraying (DC-APS) as a versatile thermal spray technique for the application of coatings with tailored properties to various substrates. The process uses a high-speed, high-temperature plasma jet to melt and propel the feedstock powder particles, making it particularly useful for improving the performance and durability of components in renewable energy systems such as solar cells, wind turbines, and fuel cells. The integration of nanostructured alumina (Al₂O₃) thin films into multilayer coatings is considered a promising advancement that improves mechanical strength, thermal stability, and environmental resistance. The More >

Yuxin He^1,#, Yixin Li^2,#, Qiaoguang Li¹, Wenqing Xiao^1,*, Guijun Xie^2,*

Journal of Renewable Materials, Vol.13, No.4, pp. 699-718, 2025, DOI:10.32604/jrm.2025.058349 - 21 April 2025

Abstract Wood, recognized as a renewable and environmentally sustainable material, plays a crucial role as an alternative energy resource within the construction industry. However, it is highly susceptible to mold and decay fungi, which can lead to surface discoloration and potentially compromise the structural integrity of wood. The advancement of nanotechnology has introduced innovative strategies for wood protection, enhancing its performance while imparting additional properties. Various approaches including nanosized metals, polymer nanocomposite and coating treatments are actively being explored in this field. Furthermore, integrating bio-based materials with nanotechnology offers a green and sustainable method for wood More >