{"id":4206,"date":"2011-10-09T02:46:41","date_gmt":"2011-10-08T18:46:41","guid":{"rendered":"http:\/\/www.andrewsun.net\/panta_rhei\/?p=4206"},"modified":"2011-10-09T02:46:41","modified_gmt":"2011-10-08T18:46:41","slug":"%e5%85%b3%e4%ba%8ecox-merz%e8%a7%84%e5%88%99%e7%9a%84%e6%9c%89%e7%9b%8a%e8%ae%a8%e8%ae%ba","status":"publish","type":"post","link":"https:\/\/www.andrewsun.net\/panta_rhei\/archives\/4206","title":{"rendered":"\u5173\u4e8eCox-Merz\u89c4\u5219\u7684\u6709\u76ca\u8ba8\u8bba"},"content":{"rendered":"<div class=\"kcite-section\" kcite-section-id=\"4206\">\n<p>\u6211\u4e4b\u524d\u4ece\u4e00\u7bc7paper\u51fa\u53d1<a href=\"http:\/\/www.andrewsun.net\/panta_rhei\/archives\/3664\" title=\"Cox-Merz rule\uff1a\u8868\u89c2\u7684\u666e\u904d\u6027\u548c\u7406\u8bba\u7684\u666e\u9002\u6027\">\u8ba8\u8bba\u8fc7<\/a>\u6211\u5bf9Cox-Merz\u89c4\u5219\u7684\u770b\u6cd5\u3002\u6211\u5728LinkedIn\u7684Society of Rheology\u7fa4\u91cc\u4e5f\u66fe\u7ecf<a href=\"http:\/\/www.linkedin.com\/groupItem?view=&#038;gid=1797350&#038;type=member&#038;item=66129808&#038;qid=96dc9106-8444-410a-8ba7-975c1d9253db&#038;trk=group_most_popular-0-b-ttl&#038;goback=%2Egde_1797350_member_66129808%2Egmp_1797350\">\u53d1\u8d77\u8fc7\u76f8\u5173\u8ba8\u8bba<\/a>\uff0c\u73b0\u5728\u8fd9\u4e2a\u8ba8\u8bba\u5f88\u957f\u4e86\uff0c\u800c\u4e14\u51fa\u73b0\u4e86\u4e00\u4e9b\u8ba9\u6211\u83b7\u76ca\u826f\u591a\u7684\u56de\u590d\u3002\u4f8b\u5982\uff1a<\/p>\n<blockquote><p>I think the main &#8220;killer&#8221; of CM is when the (large) strains in a steady state measurement start to modify the structure. So colloidal &#038; thixotropic systems, gels can be problematic. If the system can be assumed to be robust under large strains, like polymer solutions, low molar mass fluids then CM works quite well. I have always interpreted CM as &#8220;there is only one obvious time scale&#8221;: for steady state 1\/shear rate, for dynamic 1\/frequency. <b>Rheology is not much more than forcing a time scale onto the system.The physics takes care of the rest<\/b> (OK,OK = leap of faith). If the material does not withstand steady state strains of 1-100 or so without changing its local structure then you have a problem. From a physics point of view I am still not sure whether I like eta* as a concept, one might argue that the viscosity of a steel bar is quite small (i.e. totally elastic) but of course it does not creep noticeably so then viscosity is &#8220;infinite&#8221;. Would be happy to discuss this further, it is one of those nagging problems that you apparently have to live with.<\/p><\/blockquote>\n<!-- kcite active, but no citations found -->\n<\/div> <!-- kcite-section 4206 -->","protected":false},"excerpt":{"rendered":"<p>\u6211\u4e4b\u524d\u4ece\u4e00\u7bc7paper\u51fa\u53d1\u8ba8\u8bba\u8fc7\u6211\u5bf9Cox-Merz\u89c4\u5219\u7684\u770b\u6cd5\u3002\u6211\u5728LinkedIn\u7684Society of Rheology\u7fa4\u91cc\u4e5f\u66fe\u7ecf\u53d1\u8d77\u8fc7\u76f8\u5173\u8ba8\u8bba\uff0c\u73b0\u5728\u8fd9\u4e2a\u8ba8\u8bba\u5f88\u957f\u4e86\uff0c\u800c\u4e14\u51fa\u73b0\u4e86\u4e00\u4e9b\u8ba9\u6211\u83b7\u76ca\u826f\u591a\u7684\u56de\u590d\u3002\u4f8b\u5982\uff1a I think the main &#8220;killer&#8221; of CM is when the (large) strains in a steady state measurement start to modify the structure. So colloidal &#038; thixotropic systems, gels can be problematic. If the system can be assumed to be robust under large strains, like polymer solutions, low molar mass fluids then CM [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[212],"tags":[266,165],"class_list":["post-4206","post","type-post","status-publish","format-standard","hentry","category-tagged","tag-cox-merz","tag-rheology"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p1aPvF-15Q","jetpack-related-posts":[{"id":3664,"url":"https:\/\/www.andrewsun.net\/panta_rhei\/archives\/3664","url_meta":{"origin":4206,"position":0},"title":"Cox-Merz rule\uff1a\u8868\u89c2\u7684\u666e\u904d\u6027\u548c\u7406\u8bba\u7684\u666e\u9002\u6027","author":"Andrew","date":"2011\u5e748\u670815\u65e5","format":false,"excerpt":"Mead, D. (2011). Analytic derivation of the Cox\u2013Merz rule using the MLD \"toy\" model for polydisperse linear polymers Rheologica Acta DOI: 10.1007\/s00397-011-0550-5\u524d\u6bb5\u65f6\u95f4\uff0c\u6211\u5bfc\u5e08\u7ed9\u8fc7\u6211\u4e00\u7bc7\u6d41\u53d8\u5b66\u5b9e\u9a8c\u7684\u7a3f\u5b50\u5e2e\u5fd9\u5ba1\u4e00\u4e0b\u3002\u6587\u7ae0\u662f\u5728\u6bd4\u8f83Giesekus\u548cPTT\u4e24\u4e2a\u6a21\u578b\uff0c\u5b9e\u9a8c\u4f53\u7cfb\u662f\u4e00\u79cd\u591a\u7cd6\u9ad8\u5206\u5b50\u6c34\u6eb6\u6db2\u3002\u5176\u4e2d\u4f5c\u8005\u5bf9\u6837\u54c1\u662f\u5426\u7b26\u5408Cox-Merz\u89c4\u5219\u8fdb\u884c\u4e86\u4e00\u4e0b\u9a8c\u8bc1\uff0c\u53d1\u73b0\u4f4e\u6d53\u5ea6\u7684\u6837\u54c1\u7b26\u5408\u89c4\u5219\uff0c\u9ad8\u6d53\u5ea6\u7684\u6837\u54c1\u5c31\u4e0d\u7b26\u5408\uff0c\u4e00\u822c\u6027\u5730\u8fdb\u884c\u4e86\u4e00\u4e0b\u89e3\u91ca\u3002\u6211\u53d1\u73b0\u8fd9\u7bc7\u7a3f\u5b50\u5b8c\u5168\u7167\u7740\u5df2\u53d1\u8868\u7684J. Rheol.\u8bba\u6587\u6765\u505a\u7684\uff0c\u53ea\u662f\u5b9e\u9a8c\u4f53\u7cfb\u4ece\u4e00\u79cd\u591a\u7cd6\u9ad8\u5206\u5b50\u6362\u6210\u4e86\u53e6\u4e00\u79cd\u591a\u7cd6\u9ad8\u5206\u5b50\u3002\u800c\u4e14\u6211\u5ba1\u7684\u7a3f\u5b50\u6ca1\u6709\u628aJ. Rheol.\u7684\u5de5\u4f5c\u90fd\u6a21\u4eff\u505a\u5168\uff0c\u6389\u4e86\u51e0\u4e2a\u91cd\u8981\u7684\u5b9e\u9a8c\uff0c\u53c8\u60f3\u8bd5\u56fe\u4e0bJ. Rheol.\u8bba\u6587\u6240\u4e0b\u7684\u7ed3\u8bba\uff0c\u56e0\u6b64\u5c31\u663e\u5f97\u7f3a\u4e4f\u652f\u6301\u3002\u4e0d\u8fc7\uff0c\u5728\u8fd9\u91cc\u6211\u4e3b\u8981\u60f3\u8bb2\u5173\u4e8eCox-Merz\u89c4\u5219\u7684\u95ee\u9898\u3002\u62ff\u4e2a\u6837\u54c1\u8bd5\u8bd5Cox-Merz\u89c4\u5219\u662f\u5f88\u8fc7\u65f6\u7684\u505a\u6cd5\u4e86\uff0c\u56e0\u4e3a\u8fd9\u6837\u7684\u5b9e\u9a8c\u62a5\u9053\u5df2\u7ecf\u975e\u5e38\u591a\u3002\u800c\u4e14\u7ecf\u9a8c\u4e0a\u4ec0\u4e48\u6837\u7684\u6837\u54c1\u4f1a\u7b26\u5408Cox-Merz\u89c4\u5219\uff0c\u4ec0\u4e48\u6837\u7684\u6837\u54c1\u5219\u4e0d\u7b26\u5408\uff0c\u5df2\u7ecf\u6bd4\u8f83\u6e05\u695a\u3002\u7406\u8bba\u4e0a\uff0c\u5404\u4e2a\u9ad8\u5206\u5b50\u672c\u6784\u6a21\u578b\u662f\u5426\u7b26\u5408Cox-Merz\u89c4\u5219\u4e5f\u65e9\u5c31\u6709\u7ed3\u8bba\u4e86\u3002\u6240\u4ee5\uff0c\u4eca\u5929\u518d\u62ff\u4e00\u4e2a\u6837\u54c1\u6765\u505a\u5b9e\u9a8c\uff0c\u65e0\u8bba\u7ed3\u679c\u7b26\u4e0d\u7b26\u5408Cox-Merz\u89c4\u5219\u90fd\u6ca1\u6709\u65b0\u610f\u3002\u56e0\u4e3a\u4f60\u603b\u80fd\u627e\u5230\u4e2a\u5728\u81f4\u7684\u89e3\u91ca\uff0c\u4e5f\u80fd\u627e\u5230\u4e00\u4e2a\u81ea\u5706\u5176\u8bf4\u7684\u672c\u6784\u6a21\u578b\u6765\u62df\u5408\u4e00\u4e0b\u3002\u6240\u6709\u8fd9\u4e9b\u90fd\u8d85\u4e0d\u51fa\u76ee\u524d\u7684\u8ba4\u8bc6\u6c34\u5e73\uff0c\u4e5f\u6df1\u5165\u4e0d\u5230\u5b9e\u8d28\u3002\u6240\u8c13\u6df1\u5165\u5230\u5b9e\u8d28\u5176\u5b9e\u5c31\u662f\u60f3\u628a\u73b0\u8c61\u7ed9\u7ed3\u6784\u8054\u7cfb\u8d77\u6765\u3002\u50cfGiesekus\u3001PTT\u8fd9\u4e9b\u6a21\u578b\u7531\u4e8e\u662f\u534a\u7ecf\u9a8c\u6a21\u578b\uff0c\u65e0\u8bba\u5b83\u4eec\u7b26\u4e0d\u7b26\u5408Cox-Merz\u6a21\u578b\uff0c\u90fd\u6ca1\u6df1\u5165\u5230\u5b9e\u8d28\u3002\u76ee\u524d\u9ad8\u5206\u5b50\u4f53\u7cfb\u552f\u4e00\u7684first principle\u6a21\u578b\u662f\u57fa\u4e8eDoi-Edwards\u7684reptation\u6a21\u578b\uff08DE\uff09\u3002\u6700\u539f\u59cb\u7684Doi-Edwards\u6a21\u578b\u5374\u4e0d\u80fd\u9884\u6d4bCox-Merz rule\uff0c\u8fd9\u8ddf\u5b9e\u9645\u89c2\u5bdf\u5230\u7684Cox-Merz rule\u7684\u666e\u904d\u6027\u76f8\u6096\u3002\u8fd1\u5e74\u6765\u5927\u5bb6\u4e0d\u60f3\u518d\u62ff\u201c\u5b9e\u9645\u6837\u54c1\u5e38\u5e38\u662f\u591a\u5206\u6563\u7684\u201d\u4f5c\u4e3a\u501f\u53e3\u6765\u89e3\u91ca\u5b9e\u9a8c\u4e0eDE\u6a21\u578b\u7684\u4e0d\u7b26\u4e86\uff0c\u56e0\u6b64\u5f15\u5165\u4e86convected constraint-release\uff08CCR\uff09\u548ccontour length fluctuation\uff08CLF\uff09\u4e24\u4e2a\u56e0\u7d20\uff0c\u6210\u4e3a\u4e86\u6700\u8fd1\u91cd\u71c3\u4f20\u7edf\u9ad8\u5206\u5b50\u7269\u7406\u5e0c\u671b\u7684\u70ed\u95e8\u8bdd\u9898\u3002CCR\u5e2eDE\u89e3\u51b3\u4e86\u5f88\u591a\u5c34\u5c2c\uff0c\u5c24\u5176\u662f\u771f\u6b63\u7684\u5927\u5e45\u5f62\u53d8\uff08\u5373\u6d41\u52a8\uff09\u60c5\u51b5\u4e0b\u7684\u5c34\u5c2c\u30021996\u5e74Marrucci\u5728J. Non-Newt. Fluid Mech.\u4e0a\u53d1\u8868\u4e86\u4e24\u7bc7\u6587\u7ae0\u660e\u786e\u5730\u6307\u51fa\u4e86\uff0c\u8981\u4f7fDE\u7b26\u5408Cox-Merz 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&quot;\u4ee5tag\u5206\u7c7b\u7684\u6587\u7ae0&quot;","block_context":{"text":"\u4ee5tag\u5206\u7c7b\u7684\u6587\u7ae0","link":"https:\/\/www.andrewsun.net\/panta_rhei\/archives\/category\/tagged"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1303,"url":"https:\/\/www.andrewsun.net\/panta_rhei\/archives\/1303","url_meta":{"origin":4206,"position":2},"title":"\u7b80\u5355\u51e0\u4f55\u4e0e\u529b\u5b66\u6a21\u578b\u80fd\u5426\u641e\u5b9aSoft Colloidal Glass\u6d41\u53d8\u5b66\uff1f","author":"Andrew","date":"2010\u5e747\u670828\u65e5","format":false,"excerpt":"Roger\u00a0T.\u00a0Bonnecaze, & Michel\u00a0Cloitre (2010). 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Modern rheometers will give you numbers, no problem, but the question is always whether they are correct. 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Parts of the tasks have been submitted or published. Observation during preshear Comparison of different shear rates Steady shear flow [math]\\eta[\/math] vs [math]\\dot{\\gamma}[\/math]. Procedure: steady preshear at [math]\\dot{\\gamma}[\/math] = 200 s-1 for 200s, delay for 800s, steady state flow test. 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