The behaviors of particle-wall collision for non-spherical particles: Experimental investigation

2020 ◽  
Vol 363 ◽  
pp. 187-194 ◽  
Author(s):  
Jingyu Wang ◽  
Man Zhang ◽  
Lele Feng ◽  
Hairui Yang ◽  
Yuxin Wu ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Spherical Particles ◽  
Wall Collision

Thermal Contact Conductance of Packed Beds in Contact With a Flat Surface

1988 ◽  
Vol 110 (1) ◽  
pp. 38-41 ◽  
Author(s):  
G. P. Peterson ◽  
L. S. Fletcher
Keyword(s):  
Experimental Investigation ◽  
Stainless Steel ◽  
Thermal Contact ◽  
Spherical Particles ◽  
Thermal Contact Conductance ◽  
Packed Beds ◽  
Contact Conductance ◽  
Analytical Expression ◽  
Flat Surfaces ◽  
Stainless Steel 304

An experimental investigation was conducted to determine the thermal contact conductance of packed beds of spherical particles in contact with flat surfaces. Beds comprised of four materials, Aluminum 2017-T4, Yellow Brass, Stainless Steel 304, and Chromium Alloy AISI 52100, all in contact with flat Stainless Steel 304, surfaces were evaluated in a vacuum environment, at a mean interface temperature of 66°C. In addition to the experimental program, an analytical expression was developed by combining previous work performed by other investigators. The results of the experimental investigation are compared with the analytical expression and indicate that an accurate method of predicting the thermal contact conductance at the interface between beds of spherical particles and nominally flat surfaces has been identified.

Kinetic Simulations for Analysing the Wall Collision Process of Non-Spherical Particles

2002 ◽  
Author(s):  
M. Sommerfeld
Keyword(s):  
Particle Shape ◽  
Fluid Dynamic ◽  
Impact Angle ◽  
Distribution Functions ◽  
Spherical Particles ◽  
Collision Process ◽  
Wall Collision ◽  
Particle Velocities ◽  
The Impact ◽  
Particle Shapes

In wall-bounded gas-solid flows the wall collision process plays an important role and may be strongly affected by wall roughness and particle shape. The modelling of the particle-wall collision mostly relies on the assumption of spherical particles. To extend such models appropriately for non-spherical particles, two-dimensional kinetic simulations were performed for different particle shapes. This implies, that the particle translational and angular motion is calculated by considering the particle shape, however neglecting fluid dynamic effects. The change of the particle velocities during the impact and rebound process was calculated by solving the impulse equations together with Coulombs law of friction. The simulations were performed for a given initial particle velocity by varying impact angle and initial angular velocity. The results for 2000 particle wall collisions allowed us to derive the distribution functions of the impact parameters required to describe the wall collision process for non-spherical particles correctly. Moreover, other wall collision properties, such as rebound angle and velocity ratios could be determined. Finally also a comparison with measurements was possible.

The behaviors of particle-wall collision for non-spherical particles: Modeling analysis

2020 ◽  
Vol 366 ◽  
pp. 137-143
Author(s):  
Jingyu Wang ◽  
Hairui Yang ◽  
Lele Feng ◽  
Man Zhang ◽  
Yuxin Wu ◽  
...  
Keyword(s):  
Spherical Particles ◽  
Modeling Analysis ◽  
Wall Collision

Numerical and experimental investigation of the pressure drop in packings of spherical and non-spherical particles

2015 ◽  
Author(s):  
Kevin Vollmari ◽  
Muhammad S. Khan ◽  
Tobias Oschmann ◽  
Harald Kruggel-Emden
Keyword(s):  
Experimental Investigation ◽  
Pressure Drop ◽  
Spherical Particles

scholarly journals Experimental investigation of heat transfer in three phase fluidized bed cooling column

2015 ◽  
Vol 21 (4) ◽  
pp. 519-526
Author(s):  
Zorana Arsenijevic ◽  
Tatjana Kaludjerovic-Radoicic ◽  
Mihal Djuris ◽  
Zeljko Grbavcic
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Fluidized Bed ◽  
Cooling Water ◽  
Spherical Particles ◽  
Percentage Error ◽  
Hot Air ◽  
Air Temperatures ◽  
Three Phase ◽  
Fluidized System

In this study, a three-phase (gas-liquid-solid) fluidized bed was used to study the heat transfer characteristics of the system. The system consisted of low density (290 kg/m3) spherical particles of the diameter of 2 cm in 0.25 m cylindrical column with the countercurrent flow of water and air. The experimental investigation and mathematical modeling of heat transfer between the hot air and the cooling water was carried out. The experiments were conducted for the variety of different fluid flow rates and inlet air temperatures, while the air flow rate was kept constant. Based on the obtained experimental results a new correlation for heat transfer in three-phase fluidized system was proposed. The mean percentage error between the experimental and the correlated values of the jHp obtained was 1.69%. The hydrodynamic parameters of the system were also calculated according to the available literature correlations.

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