{"title":"粘弹性流动中粗糙边界附近的剪切变薄","authors":"S. Hasan","doi":"10.12988/astp.2016.6624","DOIUrl":null,"url":null,"abstract":"When polymer melts flow near a corrugated boundary, individual chains go through oscillatory shear due to the perturbed velocity field produced by corrugation. In order to obtain friction constant for this surface, we find total dissipation using the oscillatory strain rate of individual chains. For small slip velocities this friction constant approaches the constant obtained by macroscopic hydrodynamics (P. G. De Gennes, C. R. Acad. Sci. Paris Ser. B, 289:220, 1979). Large slip velocities mean smaller time period of shear oscillation, so less dissipation and we observe shear thinning. PACS: 47.57.Ng; 47.85.md; 61.25.H","PeriodicalId":127314,"journal":{"name":"Advanced Studies in Theoretical Physics","volume":"47 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2012-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Shear thinning near the rough boundary in a viscoelastic flow\",\"authors\":\"S. Hasan\",\"doi\":\"10.12988/astp.2016.6624\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"When polymer melts flow near a corrugated boundary, individual chains go through oscillatory shear due to the perturbed velocity field produced by corrugation. In order to obtain friction constant for this surface, we find total dissipation using the oscillatory strain rate of individual chains. For small slip velocities this friction constant approaches the constant obtained by macroscopic hydrodynamics (P. G. De Gennes, C. R. Acad. Sci. Paris Ser. B, 289:220, 1979). Large slip velocities mean smaller time period of shear oscillation, so less dissipation and we observe shear thinning. PACS: 47.57.Ng; 47.85.md; 61.25.H\",\"PeriodicalId\":127314,\"journal\":{\"name\":\"Advanced Studies in Theoretical Physics\",\"volume\":\"47 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2012-02-29\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Advanced Studies in Theoretical Physics\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.12988/astp.2016.6624\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Advanced Studies in Theoretical Physics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.12988/astp.2016.6624","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
摘要
当聚合物熔体在波纹边界附近流动时，由于波纹产生的扰动速度场，单个链发生振荡剪切。为了得到该表面的摩擦常数，我们使用单个链的振荡应变率求总耗散。对于小滑移速度，摩擦常数接近宏观流体力学得到的常数(P. G. De Gennes, C. R. Acad. Sci.)。巴黎爵士。[j] .中国农业科学，2009(5):391 - 391。滑移速度越大，剪切振荡周期越短，耗散越小，剪切变薄。pac: 47.57.Ng;47.85.md;61.25.H
Shear thinning near the rough boundary in a viscoelastic flow
When polymer melts flow near a corrugated boundary, individual chains go through oscillatory shear due to the perturbed velocity field produced by corrugation. In order to obtain friction constant for this surface, we find total dissipation using the oscillatory strain rate of individual chains. For small slip velocities this friction constant approaches the constant obtained by macroscopic hydrodynamics (P. G. De Gennes, C. R. Acad. Sci. Paris Ser. B, 289:220, 1979). Large slip velocities mean smaller time period of shear oscillation, so less dissipation and we observe shear thinning. PACS: 47.57.Ng; 47.85.md; 61.25.H
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