Topic
Overpressure
About: Overpressure is a research topic. Over the lifetime, 3236 publications have been published within this topic receiving 34648 citations.
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TL;DR: In this article, a complementary work concerning the modeling of gas pressure at the overpack-engineered barrier interface and its comparison with the clay gas breakthrough pressure was made possible by integrating the results of past and recent studies in this area.
88 citations
TL;DR: In this article, a parametric experimental study of explosion initiated in a vessel and vented through a duct is presented, where the authors clarify the mechanism of the vessel-duct mutual interaction during explosion and its role in determining the overpressure in the vessel.
87 citations
TL;DR: Subharmonics present in the echo responses of phospholipid-shell microbubbles excited at low acoustic pressure amplitudes are indeed related to theecho responses from compression-only bubbles, and may be exploited for improving methods for noninvasive pressure measurement in heart cavities or big vessels in the human body.
Abstract: Subharmonic scattering of phospholipid-shell microbubbles excited at relatively low acoustic pressure amplitudes (<;30 kPa) has been associated with echo responses from compression-only bubbles having initial surface tension values close to zero. In this work, the relation between subharmonics and compression-only behavior of phospholipid-shell microbubbles was investigated, experimentally and by simulation, as a function of the initial surface tension by applying ambient overpressures of 0 and 180 mmHg. The microbubbles were excited using a 64-cycle transmit burst with a center frequency of 4 MHz and peak-negative pressure amplitudes ranging from 20 of 150 kPa. In these conditions, an increase in subharmonic response of 28.9 dB (P <; 0.05) was measured at 50 kPa after applying an overpressure of 180 mmHg. Simulations using the Marmottant model, taking into account the effect of ambient overpressure on bubble size and initial surface tension, confirmed the relation between subharmonics observed in the pressure-time curves and compression-only behavior observed in the radius-time curves. The trend of an increase in subharmonic response as a function of ambient overpressure, i.e., as a function of the initial surface tension, was predicted by the model. Subharmonics present in the echo responses of phospholipid-shell microbubbles excited at low acoustic pressure amplitudes are indeed related to the echo responses from compression-only bubbles. The increase in subharmonics as a function of ambient overpressure may be exploited for improving methods for noninvasive pressure measurement in heart cavities or big vessels in the human body.
87 citations
86 citations
TL;DR: In this article, a new approach is proposed, based on the more realistic assumption of an adiabatic and irreversible expansion process; the real properties of the substance involved in the explosion are used.
Abstract: Although a certain number of authors have analyzed the prediction of boiling liquid expanding vapour explosion (BLEVE) and fireball effects, only very few of them have proposed methodologies for predicting the overpressure from such explosions. In this paper, the methods previously published are discussed and shown to introduce a significant overestimation due to the erroneous thermodynamic assumptions—ideal gas behaviour and isentropic vapour expansion—on which they are based (in fact, they give the maximum value of overpressure which can be caused by a BLEVE). A new approach is proposed, based on the—more realistic—assumption of an adiabatic and irreversible expansion process; the real properties of the substance involved in the explosion are used. The two methods are compared through the application to a given case.
84 citations