Storage and Flow of Solids
01 Jan 1964-
About: The article was published on 1964-01-01 and is currently open access. It has received 585 citations till now. The article focuses on the topics: Flow (mathematics).
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01 Jan 2007
1 citations
TL;DR: In this article, the experimental results of mass-flow hopper arch geometry investigation, which was conducted using a variable geometry plane-flow bin, were presented, where cohesive arches formed under different critical outlet openings and hopper half-angles were measured using a 360° two-dimensional laser line scan system.
Abstract: This paper presents the experimental results of mass-flow hopper arch geometry investigation, which was conducted using a variable geometry plane-flow bin The cohesive arches formed under different critical outlet openings and hopper half-angles were measured using a 360° two-dimensional laser line scan system This system was employed to obtain the complete surface profile of each arch across the width of the outlet by moving the rotating laser along the total length of the outlet The test results were analyzed using Matlab, adopting stationary wavelet transformation de-noising to decrease the signal noise generated during the testing process The geometric data for each single line scan was smoothed and combined to present a three-dimensional arch surface profile shown to be in good agreement with the observed experimental arch profiles The angle η at the intersection of the arch with the hopper walls was then calculated by running a Matlab program and a new angle η' is introduced to the arch shape study The detailed results are discussed in the paper Arch geometry models, such as the parabolic arc and circular arc arch models developed, respectively, by Walker [ and Enstad [ are reviewed and their relevance is discussed based on the experimental results presented in this paper
1 citations
01 Jan 1996
TL;DR: In this article, the authors describe the thought process or procedure that is typically followed in an attempt to correct bulk solids flow problems in production and process equipment and describe the SystemTIVAR solutions approach to flow problems is designed to tackle a project from problem identification to a turnkey installed solution.
Abstract: Based on years of global experience the authors describe the thought process or procedure that is typically followed in an attempt to correct bulk solids flow problems in production and process equipment. Most of the time, solutions are temporary without a regard or full understanding of the problem and the associated economic impact to the overall operation of the facility. When a temporary solution does not perform adequately another one is usually tried. Some of these short term attempts will be as simple as a sledgehammer while others will be more elaborate. To properly understand a bulk solids flow problem and how to correct it, the bulk solid's flow properties should be analyzed. With this information, an engineer can determine whether the equipment is properly designed and whether a flow promotion aid will correct the problem. Sometimes it will be a combination of approaches. It is recognized that most cohesive bulk solids should be handled in hoppers that are designed for mass flow. This type of flow pattern is reliable and predictable. In addition to a properly sized outlet, the design of a mass flow bin must consider the hopper wall angles, wall material and its surface finish and the average and worst case condition of the solid's flow properties. The hopper walls must be steep and have a low enough friction for material to flow along them. In many cases, the design of the bin is proper but the wall material may not have a low enough friction. Then a retrofit with a low friction liner becomes very practical. The choice of a qualified installation contractor is very important. The contractor should be able to perform his work in a variety of adverse conditions with knowledge of bulk solids handling problems. The SYSTEMTIVAR solutions approach to flow problems is designed to tackle a project from problem identification to a turnkey installed solution. After determining that a low friction liner is a solution, a study begins on the installation site to fully understand what will be required to complete the project. The engineers at the job site as well as the installation contractor will agree on the procedures to be followed during the installation. Poly Hi Solidur will complete all of the engineering and design that is required for completion of the project to insure that proper effectiveness of the liner can be achieved. Once all parties are in agreement as to what will be done, the preparation begins.
1 citations
01 Jan 2013
1 citations
TL;DR: In this article, the primary factors affecting flowability and wall friction characteristics of granular solids and powders, as well as devote testing methodologies for this biomass material, were reviewed.
Abstract: Dependence on chemical fertilizer continually is increasing. Continual increasing of using chemicalfertilizer causes nature pollution (e.g. water contamination). This has led researchers to aggressively investigate renewable fertilizer resources, biomass, to produce organic crops and reduced wastage. Wormy compost is a bulk solid and biomass feed stocks. Wormy compost flow is obstacle as it often becomes confined by Clogging and bridging which occurs during storage and processing. The objective of this study was to review the primary factors affecting flow-ability and wall friction characteristics of granular solids and powders, as well as devote testing methodologies for this biomass material. It can be said that high moisture content and small particle size has an adverse effect on the flow property of wormy compost. Increasing the moisture content and decrees particle size of the wormy compost reduced its flow-ability from free flowing at moisture content of 25% (w.b.) and 1.18mm in particle size to cohesive at moisture content of 35% (w.b.) and 0.3mm in particle size. The maximum values of friction angle were occurred for Steel, Galvanized and Aluminum surface, respectively.
1 citations