CFD and Statistical Analysis of the Impact of Surface Physical Parameters on the Thermal Resistance of Layered Partitions in ETICS Systems DOI Creative Commons
Arkadiusz Urzędowski, Andrzej Sachajdak, Arkadiusz Syta

et al.

Energies, Journal Year: 2024, Volume and Issue: 18(1), P. 107 - 107

Published: Dec. 30, 2024

In the article, authors attempted to analyze impact of such materials factors as surface emissivity, roughness, air gap thickness, and type concrete on heat transport in microstructure vertical multilayer building walls. The analysis conducted using three-dimensional modeling tools provided information about formation its before after application a reflection-smoothing coating, which has direct emissivity was reduced from 0.93 0.29. Thermal analyses demonstrated that applying reflective thermal resistance increased significantly gap, by approximately 86%, resulted 28% improvement evaluated walls samples. studies have shown increasing thickness between insulation results increase. It is feasible enhance while simultaneously reducing their development holds significant potential for production prefabricated sandwich panels. statistical analyzes performed showed differences analyzed configurations.

Language: Английский

Mixing indices in up-scaled simulations DOI Creative Commons
Balázs Füvesi, Christoph Goniva, Stefan Luding

et al.

Powder Technology, Journal Year: 2025, Volume and Issue: unknown, P. 120775 - 120775

Published: Feb. 1, 2025

Language: Английский

Citations

0
Comparison of 2D and 3D numerical simulation of woody biomass combustion in fluidized bed reactor DOI Creative Commons
Esra Yılmaz

Biomass Conversion and Biorefinery, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 28, 2025

Abstract Biomass, a sustainable energy source, can be utilized to produce chemicals, heat, and electricity. For this purpose, studies on the gasification of woody biomass in fluidized bed reactors are interest. CFD simulations commonly for designing optimizing processes. In computational fluid dynamics (CFD) solutions, 2D 3D modeling have different advantages disadvantages terms accuracy power. offer quicker results adequate acquiring majority pertinent parameters. Conversely, methods primarily required meticulous analysis optimization purposes. The current investigation aims examine process through use CFD. This research involves performing devolatilization characteristics reactor. focus study is evaluate ability simulation represent studies. investigated behaviors gas–solid flow using ANSYS 16.0.

Language: Английский

Citations

0
Investigating the effect of cold fluid flow direction used in the outer tube on heat transfer and hot fluid pressure drop in the inner tube by numerical method DOI Creative Commons
Karrar A. Hammoodi,

Rassol Hamed Rasheed,

Seyyed Amirreza Abdollahi

et al.

Alexandria Engineering Journal, Journal Year: 2025, Volume and Issue: 119, P. 201 - 210

Published: Feb. 5, 2025

Language: Английский

Citations

0
Experimental study of syngas production from oil palm frond gasification based on bubble cap air distributor at low temperature DOI Creative Commons
Abeth Novria Sonjaya, Prima Zuldian, Ahmad Syihan Auzani

et al.

Case Studies in Chemical and Environmental Engineering, Journal Year: 2025, Volume and Issue: unknown, P. 101143 - 101143

Published: Feb. 1, 2025

Language: Английский

Citations

0
CFD-DEM Modeling and Experimental Verification of Heat Transfer Behaviors of Cylindrical Biomass Particles with Super-Ellipsoid Model DOI Creative Commons
Yuhao Hu,

Likuan Chen,

Zihan Liu

et al.

Energies, Journal Year: 2025, Volume and Issue: 18(6), P. 1504 - 1504

Published: March 18, 2025

The heat transfer (HT) characteristics of cylindrical biomass particles (CBPs) in fluidized beds (FBs) are important for their drying, direct combustion, and thermochemical transformation. To provide a deeper insight into the complex mechanisms behind HT behaviors involving CBPs, this study developed particle model within framework computational fluid dynamics coupled with discrete element method (CFD-DEM) which CBPs were characterized by super-ellipsoid model, has unique merit striking balance between accuracy efficiency. newly considers particle–particle (P-P), particle–wall (P-W), fluid–particle (F-P). Its was verified comparing numerical results experimental infrared thermography measurements terms temperature evolution particles. effects gas velocity, inlet temperature, thermal conductivity on investigated comprehensively. demonstrated following: (1) Gas velocity can improve uniformity bed distribution shorten fluctuation process uniformity. (2) A 26.8% increase leads to 13.4% proportion an orientation range 60–90°. (3) no obvious influence convective rate, or

Language: Английский

Citations

0
Packing Characteristics and Heat Transfer Performance of Non-Spherical Particles for Concentrated Solar Power Applications DOI Creative Commons

Aidana Boribayeva,

Xeniya Gvozdeva,

Boris Golman

et al.

Energies, Journal Year: 2024, Volume and Issue: 17(18), P. 4552 - 4552

Published: Sept. 11, 2024

Concentrated solar power (CSP) technology relies on thermal energy storage to extend operating hours, making the selection of heat media crucial for system efficiency. Bauxite powder, known its availability and high-temperature stability, emerges as a potential alternative conventional materials in CSP systems. This study employed discrete element method investigate influence particle shape packing transfer characteristics non-spherical particles. The research focused assessing impact sphericity by comparing spherical particles with shapes, including ellipsoids cylinders, exploring effect varying aspect ratio (AR) cylindrical Particle significantly influenced morphology, exhibiting distinct structural patterns that were absent ellipsoidal particles, strongly affected transfer, observed average temperature variations within packed bed over time. cylinders higher ratios demonstrated enhanced rates, driven increased contact area coordination numbers, despite their predominant misalignment flux direction. These insights are valuable optimizing

Language: Английский

Citations

0
Experimental Simulation Studies on Non-Uniform Fluidization Characteristics of Two-Component Particles in a Bubbling Fluidized Bed DOI Open Access

Mingmei Zhu,

Zhong Zheng,

Weiping Hao

et al.

Minerals, Journal Year: 2024, Volume and Issue: 14(11), P. 1113 - 1113

Published: Oct. 31, 2024

Taking the fluidized pre-reduction process of iron ore powder bubbling bed as background, for problem non-uniform structure in gas-solid fluidization process, characteristics bicomponent particles are investigated a cold two-dimensional by using combination physical experiments and mathematical simulations. Fluidization were carried out under typical working conditions glass beads to study effects apparent gas velocity, mass ratio, other factors on bed. Through experimental observation bubble behavior, effect cyclic change formation, rise growth rupture uniformity analyzed. The showed that two-component would be stratified, non-uniformity was strong upper part weak lower part, velocity particle size main influencing factors. Based Euler-Lagrange reference frame modeling, simulated CFD-DEM method. simulations further analyze distribution volume ratio each phase from interaction level, revealing is not uniform, flow strongly perturbed, with intense aggregation. results reveal reasons phenomenon fluidization, which can provide theoretical basis regulation process.

Language: Английский

Citations

0
CFD and Statistical Analysis of the Impact of Surface Physical Parameters on the Thermal Resistance of Layered Partitions in ETICS Systems DOI Creative Commons
Arkadiusz Urzędowski, Andrzej Sachajdak, Arkadiusz Syta

et al.

Energies, Journal Year: 2024, Volume and Issue: 18(1), P. 107 - 107

Published: Dec. 30, 2024

In the article, authors attempted to analyze impact of such materials factors as surface emissivity, roughness, air gap thickness, and type concrete on heat transport in microstructure vertical multilayer building walls. The analysis conducted using three-dimensional modeling tools provided information about formation its before after application a reflection-smoothing coating, which has direct emissivity was reduced from 0.93 0.29. Thermal analyses demonstrated that applying reflective thermal resistance increased significantly gap, by approximately 86%, resulted 28% improvement evaluated walls samples. studies have shown increasing thickness between insulation results increase. It is feasible enhance while simultaneously reducing their development holds significant potential for production prefabricated sandwich panels. statistical analyzes performed showed differences analyzed configurations.

Language: Английский

Citations

0