Topic
Material flow
About: Material flow is a research topic. Over the lifetime, 3050 publications have been published within this topic receiving 36844 citations. The topic is also known as: material stream.
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TL;DR: In this article , a material flow-based C-metric was designed aimed at converting mechanisms of closing, narrowing and slowing material loops into a single-point value, and the results showed that the metric is feasible in more situations than existing metrics and that the circularity value is highly dependent on assumptions.
11 citations
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TL;DR: In this article, the authors developed a predictive model for the slug velocity at any point in the feeder, and thus the maximum feeding tube length, that can be applied for feeder and reactor design for any biomass feedstock, and identify future areas of work for ICFAR intermittent solid feeder.
11 citations
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TL;DR: In this article, a Stokes viscoplastic flow model with a suitable constitutive law for the range of deformation rates induced in the FSW process is presented, and a good correlation has been obtained between the numerical and the experimental results.
Abstract: This work deals with the computational modeling of Friction Stir Welding (FSW) processes including the discretization of the tools. The mechanical problem has been solved using a Stokes viscoplastic flow model with a suitable constitutive law for the range of deformation rates induced in the process. The thermal problem has been solved using an advection-diffusion model using an ALE formulation. Finite element formulations have been implemented for both problems. Two-dimensional and three-dimensional FSW problems have been solved under a number of particular process conditions and a particular tool geometry. Results obtained for the material flow around the tool have been compared with published experimental results, obtained under the same process conditions. A good correlation has been obtained between the numerical and the experimental results. The patterns of the material flow reported in the references, which were obtained using experimental techniques with tracers, have been identified performing the post-process of the results obtained for the material flow using computational visualization techniques with tracers. The role played by those visualization techniques in the analysis of the material flow around the tool, leading to a better understanding of the phenomena involved in the FSW process, is pointed out.
11 citations
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TL;DR: In this paper, the authors proposed Critical WIP loops (CWIPL) for balanced flow line environment aiming at improving throughput and lead time, which establishes critical loops which their WIP identifies the time of releasing raw material to the line.
Abstract: Critical WIP loops (CWIPL) is a proposed material flow control mechanism for a balanced flow line environment aiming at improving throughput and lead time. The mechanism establishes critical loops which their WIP identifies the time of releasing raw material to the line. So, through control of WIP level of critical loops the material flow is managed. The proposed mechanism releases the raw material to the line if the ‘total WIP of the line’ or ‘the WIP of the last machine’ is less than the limit. Besides the aforementioned condition, the necessary condition for releasing the raw material to the line is ‘idleness of the first machine’. Simulation is used to compare the performance of the CWIPL, CONWIP and G-MaxWIP. Different line characteristics such as number of machines, processing time distributions and the maximum WIP level of the line are considered in numerical examples. The results show that CWIPL improves both throughput and lead time compared with CONWIP, while CWIPL has better results than G-MaxW...
11 citations
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TL;DR: In this article, a conveying region exists in which instability in flow and pipeline blockage can occur if the pressure gradient available is insufficient to maintain a minimum value of solids loading ratio.
Abstract: For fine powdered materials, capable of being conveyed in dense phase, a conveying region exists in which instability in flow and pipeline blockage can occur if the pressure gradient available is insufficient to maintain a minimum value of solids loading ratio. A reduction in material flow rate can also lead to pipeline blockage in this region. Conveying trials under-taken with cement are used to illustrate the nature of the problem.
11 citations