以離散元素法探討具中空圓柱形置入物之三維儲槽內顆粒流的卸載行為

NCUIR > Engineering College > Graduate Institute of Mechanical Engineering > Electronic Thesis & Dissertation > Item 987654321/96459

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/96459

Title:	以離散元素法探討具中空圓柱形置入物之三維儲槽內顆粒流的卸載行為
Authors:	湯智銘;Tang, Chih-Ming
Contributors:	機械工程學系
Keywords:	三維儲槽;中空圓柱形置入物;離散元素電腦模擬;傳輸性質;內部性質;應力分佈;3D silo;hollow cylindrical inserts;discrete element simulation;transport properties;internal physical properties;stress distribution
Date:	2025-01-22
Issue Date:	2025-04-09 18:31:04 (UTC+8)
Publisher:	國立中央大學
Abstract:	本研究採用離散元素法(Discrete Element Method, DEM)模擬顆粒體於具中空圓柱形置入物之三維儲槽內的循環卸載行為，探討不同尺寸參數的置入物對儲槽顆粒流質量流率的影響，並進一步分析三種置入物尺寸參數，包含置入物的裝置位置、高度與直徑，探討這些參數對儲槽中顆粒流傳輸性質與內部性質的影響，研究結果顯示：(1) 質量流率受置入物尺寸參數的影響差異甚鉅，置入物儲槽的最大質量流率為無置入物儲槽的1.35倍，最小質量流率僅有無置入物儲槽的0.6倍；(2) 採用高度較高與直徑較大的置入物導致置入物半徑範圍內的垂直速度顯著增加，並使置入物半徑範圍外的速度減少，速度分佈發生不連續；(3) 裝有置入物的儲槽於置入物下方的顆粒匯流處速度擾動較大，呈現較高的粒子溫度；(4) 裝入高度較高或直徑較大的置入物使置入物內側的顆粒滯留時間減少；(5) 同時採用高度與直徑皆大於60 mm的置入物，造成儲槽圓柱區域的壁面峰值壓力顯著增加；(6) 採用高度較高或直徑較大的置入物，在儲槽漏斗區域的壁面壓力均小於無置入物儲槽的壁面壓力；(7) 置入物儲槽的正向應力分佈均在置入物內側呈現較小值，並於置入物外側因顆粒堆積與漏斗斜面阻礙呈現較大的應力值。;This study employs the Discrete Element Method (DEM) to simulate the cyclic discharging behavior of granular materials within a three-dimensional silo equipped with hollow cylinder inserts. It investigates the effects of different size parameters of the inserts on the mass flow rate of the granular flow in the silo. Additionally, the study analyzes three size parameters of the inserts: device position, height, and diameter. To explore their influence on the transport properties and internal physical properties of the granular flow within the silo. The findings reveal the following: (1) The mass flow rate is significantly affected by the size parameters of the inserts. The maximum mass flow rate of a silo with inserts is 1.35 times that of a silo without inserts, while the minimum mass flow rate is only 0.6 times that of a silo without inserts. (2) Inserts with greater height and larger diameter lead to a significant increase in vertical velocity within the radius of the insert, while reducing the velocity outside the insert′s radius, resulting in discontinuities in the velocity distribution. (3) Silos with inserts exhibit greater fluctuation velocities and higher granular temperatures at the confluence below the insert. (4) Inserts with greater height and larger diameter reduce the residence time of particles within the radius of the insert. (5) Inserts with both height and diameter exceeding 60 mm cause a significant increase in peak wall pressure within the cylindrical region of the silo. (6) In the hopper region of the silo, the wall pressure for silos with inserts is lower than that of silos without inserts when using inserts with greater height or larger diameter. (7) The normal stress distribution in silos with inserts shows smaller values inside the insert, while outside the insert, due to particle accumulation and obstruction by the hopper slope, the stress values are higher.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

Files in This Item:

File	Description	Size	Format
index.html		0Kb	HTML	12	View/Open

社群 sharing

Loading...