<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0871-018X</journal-id>
<journal-title><![CDATA[Revista de Ciências Agrárias]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. de Ciências Agrárias]]></abbrev-journal-title>
<issn>0871-018X</issn>
<publisher>
<publisher-name><![CDATA[Sociedade de Ciências Agrárias de Portugal]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0871-018X2020000400042</article-id>
<article-id pub-id-type="doi">10.19084/rca.18390</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Rompimento de arcos coesivos em silos verticais com emprego de pneumaticos: Uma revisão bibliográfica]]></article-title>
<article-title xml:lang="en"><![CDATA[Breaking of cohesive arches in vertical silos with pneumatic ventilation: A bibliographic review]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ayres]]></surname>
<given-names><![CDATA[Gypson D. J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nascimento]]></surname>
<given-names><![CDATA[José W. B. do]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mascarenhas*]]></surname>
<given-names><![CDATA[Nágela M. H.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade Federal de Campina Grande Centro de Tecnologia e Recursos Naturais Departamento de Engenharia Agrícola]]></institution>
<addr-line><![CDATA[Campina Grande PB]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>30</day>
<month>12</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>30</day>
<month>12</month>
<year>2020</year>
</pub-date>
<volume>43</volume>
<numero>4</numero>
<fpage>42</fpage>
<lpage>54</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S0871-018X2020000400042&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S0871-018X2020000400042&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S0871-018X2020000400042&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[RESUMO A revisão visa avaliar uma técnica para solucionar a formação de arcos coesivos em silos verticais responsáveis pela obstrução do fluxo do material armazenado nos silos no processo de descarga, demonstrando que a utilização de ventilação de pneumático lateral é eficiente para a desobstrução de fluxo. A metodologia propõe a construção de um modelo reduzido de um silo, em função da viabilidade econômica do projeto e da funcionalidade. Parte-se de um percurso pela literatura referente a uma perspectiva histórica dos silos e contribuição sobre o fluxo dos produtos armazenados em silos, sobre as propriedades físicas de produtos armazenados, contribuição sobre a tremonha como parte influente para o estudo do escoamento do produto ensilado, tempo de armazenagem do produto como fator que favorece a formação de arcos coesivos, algumas diretrizes sobre o uso de modelos reduzidos em pesquisas, a possibilidade de um modelo com automação, e o uso de sensores de nível em silos. A maioria dos silos existentes no mundo não apresenta condições ideais de operação, seus projetos ainda são complexos e, muitas vezes, rodeados de incertezas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The review aims to evaluate a technique to solve the formation of cohesive arcs in vertical silos responsible for obstructing the flow of material stored in the silos in the discharge process, demonstrating that the use of lateral pneumatic ventilation is efficient for unblocking flow. The methodology proposes the construction of a reduced model of a silo, depending on the economic viability of the project and functionality. It starts from a journey through the literature referring to a historical perspective of the silos and contribution on the flow of products stored in silos, on the physical properties of stored products, contribution on the hopper as an influential part for the study of the flow of the ensiled product, product storage time as a factor that favors the formation of cohesive arcs, some guidelines on the use of reduced models in research, the possibility of a model with automation, and the use of level sensors in silos. Most of the existing silos in the world do not have ideal operating conditions, their projects are still complex and, often, surrounded by uncertainties.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[coesão]]></kwd>
<kwd lng="pt"><![CDATA[tensão normal]]></kwd>
<kwd lng="pt"><![CDATA[tensão cisalhante]]></kwd>
<kwd lng="en"><![CDATA[cohesion]]></kwd>
<kwd lng="en"><![CDATA[normal tension]]></kwd>
<kwd lng="en"><![CDATA[shear stress]]></kwd>
</kwd-group>
</article-meta>
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