{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,27]],"date-time":"2026-01-27T12:57:28Z","timestamp":1769518648076,"version":"3.49.0"},"reference-count":26,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2008,5,19]],"date-time":"2008-05-19T00:00:00Z","timestamp":1211155200000},"content-version":"vor","delay-in-days":473,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Can J Chem Eng"],"published-print":{"date-parts":[[2007,2]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>In this paper, the self\u2010induced oscillations in the mixing head of a RIM machine were modelled. An analytical and simple correlation was derived between the Strouhal number and the averaged pressure drop along the amplitude of the oscillation in the mixing chamber. This correlation theoretically identified that the frequency of the oscillations could be well correlated by the jet Reynolds number, <jats:italic>Re<jats:sub>d<\/jats:sub><\/jats:italic>, and the dimensionless distance between the two jets as proposed by Denshchikov et al., Fluid Dyn. <jats:bold>3<\/jats:bold>, 460\u2010462 (1983). The flow field dynamics in the mixing head was simulated successfully by Fluent and the computed pressure fluctuations were used to calculate the frequencies of the oscillations in the mixing head. The calculated Strouhal numbers are in good agreement with the dominant frequency from the power spectra of the measured velocity component <jats:italic>u<jats:sub>x<\/jats:sub><\/jats:italic> (Santos, 2003). Finally, the effect of <jats:italic>Re<jats:sub>d<\/jats:sub><\/jats:italic> and Froude number, <jats:italic>Fr<\/jats:italic>, on the Strouhal number was investigated in the impingement region. The average Strouhal number showed a decrease with the Reynolds numbers, due to the increasing randomness of flow field in the impingement region. It was also found that the operations at lower values of <jats:italic>Fr<\/jats:italic> presented an increasing stability up to the point where the system is unable to present dynamic evolution. The model in this paper provides a theoretical starting point towards understanding of the quantities of the oscillatory flow in the mixing head, as well as a numerical approach to evaluate the dominant frequency in the mixing chamber.<\/jats:p>","DOI":"10.1002\/cjce.5450850104","type":"journal-article","created":{"date-parts":[[2010,7,8]],"date-time":"2010-07-08T15:59:09Z","timestamp":1278604749000},"page":"45-54","source":"Crossref","is-referenced-by-count":9,"title":["Modelling of Self\u2010Induced Oscillations in the Mixing Head of a RIM Machine"],"prefix":"10.1002","volume":"85","author":[{"given":"Xiaojin","family":"Li","sequence":"first","affiliation":[]},{"given":"Ricardo J.","family":"Santos","sequence":"additional","affiliation":[]},{"given":"Jos\u00e9 Carlos B.","family":"Lopes","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2008,5,19]]},"reference":[{"key":"e_1_2_1_2_1","article-title":"Flow Visualization of Coaxial Impingement of Opposing Jets in a Mixing Chamber","volume":"4","author":"Akaike S.","year":"1986","journal-title":"Flow Visualization"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1121\/1.1909476"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF01090570"},{"key":"e_1_2_1_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0889-9746(03)00073-2"},{"key":"e_1_2_1_6_1","doi-asserted-by":"publisher","DOI":"10.1017\/S0022112078001652"},{"key":"e_1_2_1_7_1","doi-asserted-by":"publisher","DOI":"10.1002\/cjce.5450740106"},{"key":"e_1_2_1_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/cjce.5450780503"},{"key":"e_1_2_1_9_1","doi-asserted-by":"publisher","DOI":"10.1002\/pen.760220611"},{"key":"e_1_2_1_10_1","doi-asserted-by":"publisher","DOI":"10.1002\/pen.760201306"},{"key":"e_1_2_1_11_1","doi-asserted-by":"publisher","DOI":"10.1002\/pen.760170209"},{"key":"e_1_2_1_12_1","volume-title":"Flow\u2010Induce Vibrations","author":"Naudascher E.","year":"1994"},{"key":"e_1_2_1_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0889-9746(03)00045-8"},{"key":"e_1_2_1_14_1","doi-asserted-by":"publisher","DOI":"10.1121\/1.1908677"},{"key":"e_1_2_1_15_1","doi-asserted-by":"publisher","DOI":"10.2514\/3.8130"},{"key":"e_1_2_1_16_1","doi-asserted-by":"publisher","DOI":"10.1146\/annurev.fl.11.010179.000435"},{"key":"e_1_2_1_17_1","doi-asserted-by":"publisher","DOI":"10.1016\/0017-9310(94)90301-8"},{"key":"e_1_2_1_18_1","first-page":"57","article-title":"Visualization Technique for Studying Impingement Mixing at Representative Reynolds Numbers","volume":"3","author":"Sandell D. J.","year":"1985","journal-title":"Poly. Proc. Eng."},{"key":"e_1_2_1_19_1","unstructured":"Santos R. J. A. M. TeixeiraandJ. C. B.Lopes \u201cCFD Simulation of Mass Transfer in the Mixing Head of a RIM Machine\u201d 4th International Symposium on Mixing in Industrial Processes\u2010ISMIP4 (2001)."},{"key":"e_1_2_1_20_1","first-page":"17","article-title":"Operational and Design Study of RIM Machines","volume":"387","author":"Santos R. J.","year":"2002","journal-title":"Intern. Polym. Proc."},{"key":"e_1_2_1_21_1","unstructured":"Santos R. J. \u201cMixing Mechanisms in Reaction Injection Moulding \u2013 RIM. A LDA\/PIV Experimental Study and CFD Simulation\u201d PhD Thesis Universidade do Porto Portugal (2003)."},{"key":"e_1_2_1_22_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ces.2004.11.050"},{"key":"e_1_2_1_23_1","first-page":"53","article-title":"Mixhead Parameters Governing Impingement Mixing Effectiveness for Polyurethane Reactive Injection Molding Processes","volume":"4","author":"Sebastian D. H.","year":"1986","journal-title":"Poly. Proc. Eng."},{"key":"e_1_2_1_24_1","doi-asserted-by":"publisher","DOI":"10.1002\/pen.760201307"},{"key":"e_1_2_1_25_1","doi-asserted-by":"publisher","DOI":"10.1002\/cjce.5450760327"},{"key":"e_1_2_1_26_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.858205"},{"key":"e_1_2_1_27_1","unstructured":"Yeo R. W. \u201cA Numerical Study of Jet\u2010to\u2010Jet Impingement in a Mixing Head\u201d PhD Thesis McMaster University Hamilton ON Canada (1993)."}],"container-title":["The Canadian Journal of Chemical Engineering"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.1002%2Fcjce.5450850104","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/cjce.5450850104","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,11,14]],"date-time":"2023-11-14T18:56:51Z","timestamp":1699988211000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1002\/cjce.5450850104"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2007,2]]},"references-count":26,"journal-issue":{"issue":"1","published-print":{"date-parts":[[2007,2]]}},"alternative-id":["10.1002\/cjce.5450850104"],"URL":"https:\/\/doi.org\/10.1002\/cjce.5450850104","archive":["Portico"],"relation":{},"ISSN":["0008-4034","1939-019X"],"issn-type":[{"value":"0008-4034","type":"print"},{"value":"1939-019X","type":"electronic"}],"subject":[],"published":{"date-parts":[[2007,2]]}}}