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This study investigates the acoustic emission mechanisms of millimeter-scale bubbles using high-speed imaging and hydrophone measurements over a range of gas flow rates. A spherical-cap\u2013cone correction is introduced into the classical force-balance model to characterize the non-spherical morphology of bubbles detaching from large orifices at low flow rates, improving detachment-diameter prediction. With increasing gas flow rate, the classical Minnaert frequency increasingly overestimates the dominant detachment acoustic frequency. A coupled-bubble oscillator model accounting for interactions between newly detached and rising bubbles reproduces this downward frequency shift. Under stable gas supply and nearly axisymmetric detachment, three satellite-bubble pinch-off modes are observed during bubble ascent. Statistical analysis reveals that the dominant pinch-off mode is governed by the competition between inertial-buoyancy effects and surface tension. These events generate distinct acoustic pulses associated with satellite-bubble volume oscillations and re-excitation of the parent-bubble breathing mode, driven by Laplace-pressure perturbations induced by abrupt changes in interfacial curvature. This study clarifies the unsteady dynamics and acoustic emission mechanisms of nozzle-generated bubbles, supporting acoustic monitoring of gas-liquid two-phase flows.<\/jats:p>","DOI":"10.1121\/10.0046813","type":"journal-article","created":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T12:02:41Z","timestamp":1790856161000},"page":"2810-2821","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Acoustic emission mechanisms of bubble detachment and pinch-off"],"prefix":"10.1121","volume":"160","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-4913-9211","authenticated-orcid":false,"given":"Mingyue","family":"Kuang","sequence":"first","affiliation":[{"name":"College of Shipbuilding Engineering, Harbin Engineering University 1 , Harbin 150001,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-7247-034X","authenticated-orcid":false,"given":"Qihang","family":"Chen","sequence":"additional","affiliation":[{"name":"College of Shipbuilding Engineering, Harbin Engineering University 1 , Harbin 150001,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yulu","family":"Dai","sequence":"additional","affiliation":[{"name":"College of Shipbuilding Engineering, Harbin Engineering University 1 , Harbin 150001,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1299-3049","authenticated-orcid":false,"given":"A-Man","family":"Zhang","sequence":"additional","affiliation":[{"name":"College of Shipbuilding Engineering, Harbin Engineering University 1 , Harbin 150001,","place":["China"]},{"name":"National Key Lab of Ship Structural Safety, Harbin Engineering University 2 , Harbin 150001,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3043-5617","authenticated-orcid":false,"given":"Shuai","family":"Li","sequence":"additional","affiliation":[{"name":"College of Shipbuilding Engineering, Harbin Engineering University 1 , Harbin 150001,","place":["China"]},{"name":"National Key Lab of Ship Structural Safety, Harbin Engineering University 2 , Harbin 150001,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"231","published-online":{"date-parts":[[2026,10,1]]},"reference":[{"key":"2026100108023569300_c1","doi-asserted-by":"publisher","first-page":"041703","DOI":"10.1063\/5.0263935","article-title":"On the origin and nature of acoustic emissions from bubbles departing an underwater nozzle","volume":"37","year":"2025","journal-title":"Phys. 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