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To better understand and predict how surgical changes affect drug transport, the ostium can be modelled as a simplified T-junction. The geometric configuration of these junctions plays a crucial role in managing particle flow; however, optimal design parameters remain under-explored. This paper addresses this gap, by simulating a range of radius of curvatures\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$R_{\\text {c}}$$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:msub>\n                            <mml:mi>R<\/mml:mi>\n                            <mml:mtext>c<\/mml:mtext>\n                          <\/mml:msub>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    at the T-junction and oscillatory flows with pulsation frequencies of 0, 30, 45, 60 and 75 Hz to analyse their effects on particle penetration and distribution. The results revealed that an anterior\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$R_{\\text {c}}$$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:msub>\n                            <mml:mi>R<\/mml:mi>\n                            <mml:mtext>c<\/mml:mtext>\n                          <\/mml:msub>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    enhanced particle outflow through the\n                    <jats:italic>y<\/jats:italic>\n                    -branch (perpendicular) outlet, while a posterior\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$R_{\\text {c}}$$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:msub>\n                            <mml:mi>R<\/mml:mi>\n                            <mml:mtext>c<\/mml:mtext>\n                          <\/mml:msub>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    limited this outflow. Comparisons of pulsating frequencies further showed that a lower frequency improved penetration into the\n                    <jats:italic>y<\/jats:italic>\n                    -branch. Interestingly, applying both anterior and posterior\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$R_{\\text {c}}$$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:msub>\n                            <mml:mi>R<\/mml:mi>\n                            <mml:mtext>c<\/mml:mtext>\n                          <\/mml:msub>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    did not yield better performance than an anterior\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$R_{\\text {c}}$$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:msub>\n                            <mml:mi>R<\/mml:mi>\n                            <mml:mtext>c<\/mml:mtext>\n                          <\/mml:msub>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    alone. Furthermore, a constant flow rate where\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$f = 0$$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:mrow>\n                            <mml:mi>f<\/mml:mi>\n                            <mml:mo>=<\/mml:mo>\n                            <mml:mn>0<\/mml:mn>\n                          <\/mml:mrow>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    Hz promoted greater particle outflow through the\n                    <jats:italic>y<\/jats:italic>\n                    -branch in the T-junction model. However, a pulsating frequency of 30 Hz improved deposition in the nasal airway. The study underscores the potential of targeted geometric adjustments to optimise flow and deposition in the maxillary ostium, providing valuable insight into drug delivery strategies and inhalation toxicology.\n                  <\/jats:p>","DOI":"10.1007\/s10237-025-02015-9","type":"journal-article","created":{"date-parts":[[2025,10,6]],"date-time":"2025-10-06T15:36:15Z","timestamp":1759764975000},"page":"2217-2235","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Investigation of particle penetration in a nasal maxillary ostium with optimised T-junction geometry and pulsatile flow"],"prefix":"10.1007","volume":"24","author":[{"given":"Patrick","family":"Warfield-McAlpine","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David F","family":"Fletcher","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kiao","family":"Inthavong","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2025,10,6]]},"reference":[{"key":"2015_CR1","doi-asserted-by":"publisher","first-page":"719","DOI":"10.2500\/ajr.2007.21.3102","volume":"21","author":"WT Anselmo-Lima","year":"2007","unstructured":"Anselmo-Lima WT, Ferreira MDS, Valera FCP, Rossato M, Mello VR, Demarco RC (2007) Histological evaluation of maxillary sinus mucosa after functional endoscopic sinus surgery. 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