球型與非球型顆粒體在平面儲槽內流動行為之研究; Flow behaviours of spherical particles and non-spherical particles in a model silo

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Title:	球型與非球型顆粒體在平面儲槽內流動行為之研究;Flow behaviours of spherical particles and non-spherical particles in a model silo
Authors:	莊明衛;Ming-Wei Chuang
Contributors:	機械工程研究所
Keywords:	流場;擬二維;非球型顆粒體;改良式粒子追蹤法;儲槽;Flat;flow;non-spherical particle;improved PTV;Silo
Date:	2011-01-30
Issue Date:	2011-06-04 15:01:50 (UTC+8)
Publisher:	國立中央大學
Abstract:	儲槽貯存器在工業界中是一個很普遍的應用，顆粒流在儲槽上的運用與顆粒外形對流動的影響已經有好幾年的研究基礎。儲槽在藥品的配置、材料的補給、農物的存放上等均有儲存的功能性，而內容物的流動行為會影響其填裝與排放，觀察顆粒在儲槽中的流動更顯得重要。本研究利用改變儲槽內不同粒子的形狀，進一步觀察儲槽粒子之流動行為。對於觀察顆粒流動的方法很多，其中最基本的方法即標定特定粒子並追蹤這些粒子的速度。雖然追蹤粒子的使用非常普遍，但工業界對於儲槽中追蹤粒子速度的技術的相關研究還很少，傳統上仍大都以追蹤球型粒子平移速度的方法。本研究主要是利用改良式粒子追蹤法影像擷取系統，以實驗的方法探討球型與非球型顆粒體在擬二維儲槽內，改變儲槽排放出口大小對流場的影響，並嘗試改變不同顆粒體的形狀，探討顆粒形狀對速度場、質量流率、擾動速度、整體粒子溫度與整體平均動能對流場的影響。 Silos are commonly used in application for industry now. Granular flow applied for silos and the effects on shapes to flow have been researched for several years. Pharmaceutical distribution, stuff supplies and agricultural deposition, etc are loaded in silos with respect to its function of preserve. Loading and discharge are affected by the flow of contents so study on the flow in silos is more important. In this thesis we intend to make changes in the shape of particle in silos and then investigate the flow pattern. There are a lot of methods to observe the flow pattern in silos, the most basic way is to define the specific particles before tracking their velocity. Particle tracking are used commonly in application; nevertheless, studies related to particle tracking velocimetry (PTV) on industry are few. Previously, we only make use of translational velocity to diagram velocity field. In this thesis we use improved PTV image capture system to investigate the effect spherical particles and non-spherical particles in silo with different orifice sizes to flow field, and attempt to change the shape of particles to compare the flow field with different velocity field, mass flow rate, fluctuation velocity, global granular temperature and global average kinetic energy.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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