An experimental investigation on the effect of particle size into the flowability of fly ash

Rohilla, Lokesh; Garg, Vivek; Mallick, Soumya Suddha; Setia, Gautam

doi:10.1016/j.powtec.2018.02.013

Cited by 17 publications

(5 citation statements)

References 33 publications

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“…Similar conclusions for black soybean powders, where fine fractions were reported as cohesive, were made by [18]. Rohilla [19] concluded that there exists a particular particle size after which intermolecular forces become larger than weight forces, which triggered a decrease on flowability of fly ash samples.…”

Section: Introductionsupporting

confidence: 66%

Effect of torrefaction intensity on the flow properties of lignocellulosic biomass powders

Pachón‐Morales

Colin

Pierre

et al. 2019

Biomass and Bioenergy

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Flowability characterization of milled lignocellulosic biomass is essential for developing viable conveying, storing and handling solutions for gasification processes. This study investigated the effect of torrefaction on particles size and shape obtained after grinding and on flow properties of pulverized wood.Spruce and poplar samples with six torrefaction intensities were knife-milled to obtain biomass powders.Particles size and shape distribution were assessed using a morphological particle size analyser and flowability parameters were determined with a ring shear tester. A more intense treatment produces finer, rounder and more regular particles. Simultaneously, a gradual shifting was observed from a cohesive behaviour for native biomass to a nearly free flowing behaviour for the most intensively treated samples. The trends in flowability cannot be explained by the size reduction nor the increase of distribution width. Instead, the explanation lies in the reduction of shape factor and the sharpness of particle surfaces for treated samples. However, all observations are consistent with the loss of resilience of treated wood. From our results, it is clear that torrefaction, in addition to its interest on reduction of energy consumption of grinding, should also be considered as a pre-treatment step allowing to modify the flow behaviour of biomass powders.

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Section: Introductionsupporting

confidence: 66%

Effect of torrefaction intensity on the flow properties of lignocellulosic biomass powders

Pachón‐Morales

Colin

Pierre

et al. 2019

Biomass and Bioenergy

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“…The wall friction angles decrease with increasing wall normal stress, which is in accordance with various published data [36][37][38][39]. However, this effect was not equally pronounced for all wall materials and powder particle sizes.…”

Section: Wall Friction Anglessupporting

confidence: 91%

Reduction in Powder Wall Friction by an a-C:H:Si Film

Lanzerstorfer,

Forsich,

Delfin

et al. 2024

Materials

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The wall friction angle is an important parameter in powder flow. In a recent study for various powders, a reduction in the wall friction angle for steel was demonstrated by the application of an a-C:H:Si film on the steel surface. This work presents the results of a study of this effect in more detail regarding the influence of the powder material, the wall normal stress and the particle size of the powder for mass median diameters from 4 µm to approximately 150 µm. The wall friction angles were measured using a Schulze ring shear tester for three different powder materials: aluminum oxide, calcium carbonate and silicon carbide. The results showed little difference with respect to powder chemistry. For the coarser powders, the reduction in the wall friction angle due to the a-C:H:Si coating was highest (10° to 12°) and rather stress-independent, while for the fine and medium-size powders the reduction was lower and stress-dependent. With increasing wall normal stress, the reduction in the wall friction angle increased. These results can be explained by the friction reduction mechanism of a-C:H:Si, which requires a certain contact pressure for superficial graphitization.

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“…Distinguishing foreground pixels from the background pixels has been used to enhance visual perception of images [13][14][15]. One of the common techniques used to identify morphological maps [16] and image color intensity and is the threshold segmentation. The technique offers a simplicity in calculation and speed in operation [17].…”

Section: Image Segmentation and Thresholdingmentioning

confidence: 99%

Preparation, Characterization, Image Segmentation and Particle Size Analysis of Cow Bone Powder for Composite Applications

Ikumapayi

Akinlabi

Adedeji

et al. 2020

Lecture Notes in Mechanical Engineering

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Cow bone is a bio-waste material that has caused environmental unfriendliness to the people living around the place of production and deposition. In recent time, researchers have exploited various means of utilizing this bio-waste material and make it environmentally friendly and economically utilizable, especially in the area of applications, such as activated carbon, water purification, reinforcement in composites, filler and additives, and its efficacy has been traced to whether is in the form of macro-, micro-and nanoparticles. In this study, cow bone head (skull) was collected, washed and cleaned from meats, processed, sun-dried for six weeks, and it was then washed again with distilled water to remove impurities and contaminants, then placed inside the oven set at 50°C to dry for 5 h to remove any trace of moisture content and to ensure absolute dryness. It was then milled into nanoparticle powder using vibratory disk milling machine and the milling times were 0 min which was taken to be 150 µm size, 20, 40 and 60 min. The morphological and physiological characterizations were carried out using scanning electron microscopy (SEM), energy dispersive X-ray (EDX) as well as X-ray fluorescence (XRF). MATLAB (R2015a) was employed for image processing into bimodal with foreground and background pixels using thresholding segmentation method. SEM images were taken at 1.00 ×, 2.00 × and 5.00 × which resulted to 50 µm, 20 µm and 10 µm, respectively. The image segmentation was employed to determine the foreground from a background of cow bone powder (CBP) and to enhance high resolutions, visual perception as well as to achieve better quality of the final output.

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An experimental investigation on the effect of particle size into the flowability of fly ash

Cited by 17 publications

References 33 publications

Effect of torrefaction intensity on the flow properties of lignocellulosic biomass powders

Effect of torrefaction intensity on the flow properties of lignocellulosic biomass powders

Reduction in Powder Wall Friction by an a-C:H:Si Film

Preparation, Characterization, Image Segmentation and Particle Size Analysis of Cow Bone Powder for Composite Applications

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