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By applying this process, large pieces with complex shapes can be produced on an industrial scale, presenting excellent properties and quality. A true physical phenomenon occurring in the RTM process, especially when using vegetable fibers, is related to the absorption of resin by the fiber during the infiltration process. The real effect is related to the slowdown in the advance of the fluid flow front, increasing the mold filling time. This phenomenon is little explored in the literature, especially for non-isothermal conditions. In this sense, this paper does a numerical study of the liquid injection process in a closed and heated mold. The proposed mathematical modeling considers the radial, three-dimensional, and transient flow, variable injection pressure, and fluid viscosity, including the effect of liquid fluid absorption by the reinforcement (fiber). Simulations were carried out using Computational Fluid Dynamic tools. The numerical results of the filling time were compared with experimental results, and a good approximation was obtained. Further, the pressure, temperature, velocity, and volumetric fraction fields, as well as the transient history of the fluid front position and injection fluid volumetric flow rate, are presented and analyzed.<\/jats:p>","DOI":"10.3390\/jmmp9070243","type":"journal-article","created":{"date-parts":[[2025,7,18]],"date-time":"2025-07-18T12:09:53Z","timestamp":1752840593000},"page":"243","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Non-Isothermal Process of Liquid Transfer Molding: Transient 3D Simulations of Fluid Flow Through a Porous Preform Including a Sink Term"],"prefix":"10.3390","volume":"9","author":[{"given":"Jo\u00e3o V. N.","family":"Sousa","sequence":"first","affiliation":[{"name":"Postgraduate in Process Engineering Program, Federal University of Campina Grande, Campina Grande 58429-900, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1026-4523","authenticated-orcid":false,"given":"Jo\u00e3o M. P. Q.","family":"Delgado","sequence":"additional","affiliation":[{"name":"CONSTRUCT-BPG, Department of Civil Engineering, Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal"}]},{"given":"Ricardo S.","family":"Gomez","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Brazil"}]},{"given":"Hort\u00eancia L. F.","family":"Magalh\u00e3es","sequence":"additional","affiliation":[{"name":"Science and Technology Institute, Federal University of the Vales do Jequitinhonha e Mucuri, Diamantina 39100-000, Brazil"}]},{"given":"Felipe S.","family":"Lima","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-7864-3020","authenticated-orcid":false,"given":"Glauco R. F.","family":"Brito","sequence":"additional","affiliation":[{"name":"Postgraduate in Process Engineering Program, Federal University of Campina Grande, Campina Grande 58429-900, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-8333-1517","authenticated-orcid":false,"given":"Railson M. N.","family":"Alves","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Brazil"}]},{"given":"Fernando F.","family":"Vieira","sequence":"additional","affiliation":[{"name":"Department of Sanitary and Environmental Engineering, State University of Paraiba, Campina Grande 58429-500, Brazil"}]},{"given":"M\u00e1rcia R.","family":"Luiz","sequence":"additional","affiliation":[{"name":"Department of Sanitary and Environmental Engineering, State University of Paraiba, Campina Grande 58429-500, Brazil"}]},{"given":"Ivonete B.","family":"Santos","sequence":"additional","affiliation":[{"name":"Department of Physics, State University of Paraiba, Campina Grande 58429-500, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7187-419X","authenticated-orcid":false,"given":"Stephane K. B. M.","family":"Silva","sequence":"additional","affiliation":[{"name":"Postgraduate in Process Engineering Program, Federal University of Campina Grande, Campina Grande 58429-900, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1691-1872","authenticated-orcid":false,"given":"Antonio G. B.","family":"Lima","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Brazil"}]}],"member":"1968","published-online":{"date-parts":[[2025,7,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Mallick, P.K. (2007). Fiber-Reinforced Composites: Materials Manufacturing and Design, CRC Press. [3rd ed.].","DOI":"10.1201\/9781420005981"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Trzepieci\u0144ski, T., Najm, S.M., Sbayti, M., Belhadjsalah, H., Szpunar, M., and Lemu, H.G. (2021). 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