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Relevant bibliographies by topics / Pressure-volume curve

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Academic literature on the topic 'Pressure-volume curve'

Author: Grafiati

Published: 4 June 2025

Last updated: 15 July 2025

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Journal articles on the topic "Pressure-volume curve"

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Kunig, H. E. "Pressure-volume curve diagnosis." Journal of Cardiothoracic and Vascular Anesthesia 8, no. 5 (1994): 51. http://dx.doi.org/10.1016/1053-0770(94)90360-3.

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Wagers, Scott S., T. Glen Bouder, David A. Kaminsky, and Charles G. Irvin. "The Invaluable Pressure-Volume Curve." Chest 117, no. 2 (2000): 578–83. http://dx.doi.org/10.1378/chest.117.2.578.

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TAKEUCHI, MUNEYUKI, KHALED A SEDEEK, GUILHERME P P. SCHETTINO, KLAUDIUSZ SUCHODOLSKI, and ROBERT M KACMAREK. "Peak Pressure During Volume History and Pressure–Volume Curve Measurement Affects Analysis." American Journal of Respiratory and Critical Care Medicine 164, no. 7 (2001): 1225–30. http://dx.doi.org/10.1164/ajrccm.164.7.2101053.

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Dorn, Melissa, Anja Becher-Deichsel, Barbara Bockstahler, Christian Peham, and Gilles Dupré. "Pressure–Volume Curve during Capnoperitoneum in Cats." Animals 10, no. 8 (2020): 1408. http://dx.doi.org/10.3390/ani10081408.

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Laparoscopy is a growing field in veterinary medicine, although guidelines are lacking. The objective of this study was to evaluate the pressure–volume curve during capnoperitoneum in cats. A total of 59 female cats were scheduled for routine laparoscopy. Pressure and volume data were recorded and processed, and the yield point of the curve was calculated using a method based on a capacitor discharging function. For the remaining 40 cats, a linear-like pressure–volume curve was observed until a yield point with a mean cutoff pressure (COP) of 6.44 ± 1.7 mmHg (SD) (range, 2.72–13.00 mmHg) and a mean cutoff volume (COV) of 387 ± 144.35 mL (SD) (range, 178.84–968.43 mL) was reached. The mean mL/kg CO2 value in cats was 208 ± 34.69 mL/kg (range, 100.00–288.46 mL/kg). The COV correlated with COP and body weight but not with body condition score (BCS). COP correlated only with the COV. This study suggests that feline patients have a pressure–volume curve similar to that of canine patients, and the same pressure limit recommendations can be used for both species. After a yield point of 6.44 mmHg is reached, the increment in volume decreases exponentially as the intra-abdominal pressure (IAP) increases.

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Maggiore, Salvatore M., and Laurent Brochard. "Pressure-volume curve in the critically ill." Current Opinion in Critical Care 6, no. 1 (2000): 1–10. http://dx.doi.org/10.1097/00075198-200002000-00001.

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Pestaña, David. "Pressure-volume curve patterns in ARDS patients." Intensive Care Medicine 30, no. 5 (2004): 1002. http://dx.doi.org/10.1007/s00134-004-2219-3.

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Blanch, L. "Volume-pressure curve of the respiratory system." Intensive Care Medicine 24, no. 8 (1998): 886–87. http://dx.doi.org/10.1007/s001340050682.

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Shintani, H., and S. A. Glantz. "Influence of filling on left ventricular diastolic pressure-volume curve during pacing ischemia in dogs." American Journal of Physiology-Heart and Circulatory Physiology 266, no. 4 (1994): H1373—H1385. http://dx.doi.org/10.1152/ajpheart.1994.266.4.h1373.

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The reversible upward shift of the diastolic pressure-volume curve that occurs during pacing-induced ischemia has not been fully explained by increases in passive chamber stiffness or reductions in relaxation rate. We measured the fully relaxed pressure-volume relation defined by both filling and nonfilling beats and the isovolumic relaxation time constant in nonfilling beats before and during demand ischemia using our in situ left ventricular volume clamping technique in 10 dogs. Pacing-induced ischemia shifted the diastolic pressure-volume curves in filling beats upward compared with the end-diastolic pressure-volume relation of the normally perfused heart. In contrast, the end-diastolic points for nonfilling beats during pacing-induced ischemia fell on the fully relaxed pressure-volume relation defined by the normally perfused heart. Left ventricular filling per se was necessary for the upward shift of the diastolic pressure-volume curve observed during pacing-induced ischemia. We speculate that active force developed during diastole induced by stretch activation or, perhaps, length-dependent changes in calcium sensitivity of the myofilaments in the ischemic myocardium due to stretch of the myocardium during rapid diastolic filling may contribute to the upward shift of the diastolic pressure-volume curve observed during pacing-induced ischemia.

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Nishida, Tomoyo, Klaudiusz Suchodolski, Guilherme P. P. Schettino, Khaled Sedeek, Muneyuki Takeuch, and Robert M. Kacmarek. "Peak volume history and peak pressure-volume curve pressures independently affect the shape of the pressure-volume curve of the respiratory system." Critical Care Medicine 32, no. 6 (2004): 1358–64. http://dx.doi.org/10.1097/01.ccm.0000128573.28173.2e.

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Venegas, José G., R. Scott Harris, and Brett A. Simon. "A comprehensive equation for the pulmonary pressure-volume curve." Journal of Applied Physiology 84, no. 1 (1998): 389–95. http://dx.doi.org/10.1152/jappl.1998.84.1.389.

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Venegas, José G., R. Scott Harris, and Brett A. Simon.A comprehensive equation for the pulmonary pressure-volume curve. J. Appl. Physiol. 84(1): 389–395, 1998.—Quantification of pulmonary pressure-volume (P-V) curves is often limited to calculation of specific compliance at a given pressure or the recoil pressure (P) at a given volume (V). These parameters can be substantially different depending on the arbitrary pressure or volume used in the comparison and may lead to erroneous conclusions. We evaluated a sigmoidal equation of the form, V = a + b[1 +[Formula: see text]]−1, for its ability to characterize lung and respiratory system P-V curves obtained under a variety of conditions including normal and hypocapnic pneumoconstricted dog lungs ( n = 9), oleic acid-induced acute respiratory distress syndrome ( n = 2), and mechanically ventilated patients with acute respiratory distress syndrome ( n = 10). In this equation, a corresponds to the V of a lower asymptote, b to the V difference between upper and lower asymptotes, cto the P at the true inflection point of the curve, and d to a width parameter proportional to the P range within which most of the V change occurs. The equation fitted equally well inflation and deflation limbs of P-V curves with a mean goodness-of-fit coefficient ( R 2) of 0.997 ± 0.02 (SD). When the data from all analyzed P-V curves were normalized by the best-fit parameters and plotted as (V − a)/ bvs. (P − c)/ d, they collapsed into a single and tight relationship ( R 2 = 0.997). These results demonstrate that this sigmoidal equation can fit with excellent precision inflation and deflation P-V curves of normal lungs and of lungs with alveolar derecruitment and/or a region of gas trapping while yielding robust and physiologically useful parameters.

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Dissertations / Theses on the topic "Pressure-volume curve"

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Shehab, Mostafa El-Said Nasr. "The mechanism of balloon angioplasty : an experimental and clinical study of pressure and volume curves using a computerised angioplasty system." Thesis, University of Bristol, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268836.

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Ceder, Cecilia, and Kim Lissert. "Dolda vinstmöjligheter : En studie om överavkastning vid ändring av indexkompositioner." Thesis, Södertörns högskola, Institutionen för samhällsvetenskaper, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-19331.

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Syfte: Undersökningens syftet är att mäta huruvida det går att få ut en överavkastning av aktier som väljs in i (respektive ut ur) OMX Stockholm Benchmark (OMXSB), som följd av att ett index ändrar sin komposition. Delsyftet är att undersöka om det går att se en signifikant ökning av handelsvolymen i anslutning till ändringsdagen. Metod: Studien tillämpar en eventstudie som undersökningsmetod av kvantitativ karaktär. Studien undersöker indexet OMXSB och innefattade totalt 111 stycken ingående och utgående aktier fördelat på 10 tillfällen. Två eventfönster har konstruerats; ett kring annonseringsdagen och ett kring ändringsdagen. Den procentuella handelsvolymen har mätts över eventfönstret kring ändringsdagen. Resultat: Den genomsnittliga kumulerade överavkastningen för eventfönstret vid annonseringsdagen uppgick till 1,02 % (-6 %) för de aktier som valdes in (ut). Det motsvarande resultatet 2,55 % (-0,41 %) framkom i eventfönstret för ändringsdagen. Handelsvolymen uppnådde i båda fallen en signifikant ökning dagen innan ändringen genomfördes. Slutsatser: Resultatet visade en signifikant överavkastning för aktier som valdes in (ut) i eventfönstret kring ändringsdagen (annonseringsdagen). Den signifikanta skillnaden av handelsvolymen tyder på att indexerarna handlar aktierna dagen innan ändringen genomförs. För aktier som väljs in gick det att se ett pristryck där priset höjdes fram till dagen innan ändringen genomfördes, som sedan återgick. Resultaten kan ha påverkats av externa faktorer vilket kan ha lett till en missvisande bild av den undersökta effekten.<br>Purpose: The study aims to investigate whether it is possible to get an abnormal return of stocks added to (or deleted from) the OMX Stockholm Benchmark index (OMXSB), as a result of a changes of the index composition. A subsidiary aim of the study is to investigate whether it is possible to see a significant increase in trading volume in close to the change day. Methodology: The study applies an event study as method of investigation of a quantitative character. The study examines the OMXSB and include a total of 111 added and deleted stocks distributed on 10 occasions. Two event windows have been designed: one around announcement day and one around change day. The percentage change of trading volume has been measured over the event window around the change day. Results: The average cumulative abnormal return for the event window around announcement day reached 1.02% (-6%) for the added (deleted) shares. Corresponding results of 2.55% (-0.41%) emerged in event window for change day. In both cases the trading volume reached a significant increase the day before the change was implemented. Conclusions: The results showed a significant abnormal return for stocks that were added (deleted) in the event window around the change day (announcement day). Trade volume suggests that index funds trade shares the day before the change day. For the added shares a price pressure could be identified up to the day before change day. The results may have been influenced by external factors which may have lead to a misleading picture of the investigated effect.

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孫留成. "Non-invasive measurement of left ventricular pressure-volume curve during ejection phase for left ventricular function evaluation." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/45320333958634306048.

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碩士<br>國立陽明大學<br>醫學工程研究所<br>91<br>The left ventricular (LV) pressure-volume loop diagram (PV loop) is a powerful tool for left ventricular function evaluation. The LV ESPVR (end-systolic pressure-volume relationship) was obtained form the end-systolic pressure volume point on PV loop. It was an important index for LV function evaluation. However, PV loop was obtained on costly angiographic facilities. Moreover, it was measured invasively. The aim of current study was to provide a new non-invasive measurement technique to access LV function of normal subjects.We combined prior techniques, Doppler echocardiography flow signal integration, Simpson's rule for LV volume calculation and pressure wave propagation in multi-branched model, to measure left ventricular pressure and volume signal non-invasively during ejection phase and calculate the slope of ESPVR (Ees) of normal subjects. Five young healthy subjects (age: 22.8 +- 0.8367 years) was administrated under controlled stage of dose with aramine, dobutamine and normal saline. Two-dimensional echocardiograph, Doppler flow velocity signal and radial pulse signal was measured at each stage of drug dose of individual subject. LV end-systolic volume was calculated from two-dimensional echocardiograph via Simpson's rule. LV volume during ejection phase was obtained from Doppler flow signal integration. Aortic root pulse at ejection phase which was hypothesized identically with ventricular pressure during ejection phase was calculated from radial pulse base on the pressure wave propagation in multi-branched model. PV curve, i.e. PV loop at LV ejection phase, was plotted with these pressure and volume signals. ESPVR was computed and plotted from each end-systolic pressure volume point on each stage of drug dose. The results showed that with constant contractility of myocardial state (administrated with aramine and normal saline). The ESPVR remained highly linear relationship (r > 0.801, averaged Ees = 3.673 +- 0.858 mmHg/ml). With variation of myocardial state (administrated with dobutamine), the trend of change of LV end-systolic pressure-volume point was identically with the trend of change of PV loop. The result of this study suggested that it is feasible and reliable to combine different techniques to evaluate LV function non-invasively.

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Books on the topic "Pressure-volume curve"

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Vincent, Jean-Louis. Ethical issues in cardiac arrest and acute cardiac care: a European perspective. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199687039.003.0013.

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The respiratory system is key to the management of patients with respiratory, as well as haemodynamic, compromise and should be monitored. The ventilator is more than just a machine that delivers gas; it is a true respiratory system monitoring device, allowing the measurement of airway pressures and intrinsic positive end-expiratory pressure and the plotting of pressure/volume curves. For effective and reliable monitoring, it is necessary to keep in mind the physiology, such as the alveolar gas equation, heart-lung interactions, the equation of movement, etc. Monitoring the respiratory system enables adaptation of not only respiratory management, but also haemodynamic management.

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Vincent, Jean-Louis. Ethical issues in cardiac arrest and acute cardiac care: a European perspective. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199687039.003.0013_update_001.

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The respiratory system is key to the management of patients with respiratory, as well as haemodynamic, compromise and should be monitored. The ventilator is more than just a machine that delivers gas; it is a true respiratory system monitoring device, allowing the measurement of airway pressures and intrinsic positive end-expiratory pressure and the plotting of pressure/volume curves. For effective and reliable monitoring, it is necessary to keep in mind the physiology, such as the alveolar gas equation, heart-lung interactions, the equation of movement, etc. Monitoring the respiratory system enables adaptation of not only respiratory management, but also haemodynamic management.

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Vieillard-Baron, Antoine. The respiratory system. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199687039.003.0015.

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The respiratory system is key to the management of patients with respiratory, as well as haemodynamic, compromise and should be monitored. The ventilator is more than just a machine that delivers gas; it is a true respiratory system monitoring device, allowing the measurement of airway pressures and intrinsic positive end-expiratory pressure and the plotting of pressure/volume curves. For effective and reliable monitoring, it is necessary to keep in mind the physiology, such as the alveolar gas equation, heart-lung interactions, the equation of movement, etc. Monitoring the respiratory system enables adaptation of not only respiratory management, but also haemodynamic management.

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Escudier, Marcel. Hydrostatic force exerted on a submerged surface. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198719878.003.0005.

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In this chapter it is shown how to calculate the force which arises due to the hydrostatic pressure distributed over a submerged surface or object. The vertical component of force is shown to be equal in magnitude to the weight of fluid which would occupy the volume directly above the surface and to act vertically downwards through the centroid of this volume. For a curved surface, the magnitude of the horizontal component of the hydrostatic force is shown to equal the hydrostatic force on the projection of the surface onto a vertical plane. This force is equal to the product of the area of the surface and the pressure at its centroid. The buoyancy force exerted on a submerged or floating object is shown to equal the weight of the fluid displaced by the object (Archimedes’ principle) and to act vertically upwards through the centroid of the displaced fluid. Stability of floating objects is discussed and the concept of metacentric height introduced.

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Lei, Yuan. Ventilator Monitoring. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780198784975.003.0011.

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‘Ventilator Monitoring’ describes that group of functions that enables us to understand the functional status of a ventilator system and the ventilated patient. This chapter begins by introducing general monitoring concepts, describing the operation of the flow sensors and oxygen sensors that make the measurements, which are displayed as numerical monitoring parameters, waveforms, dynamic loops, and trend curves. The chapter details common monitoring parameters for pressure, flow, volume, time, and oxygen concentration. Examples of normal and abnormal ventilator graphics are shown. Finally, the chapter details each typical monitoring parameter and gives background information about its significance.

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Book chapters on the topic "Pressure-volume curve"

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Kasprowicz, M., Marek Czosnyka, Z. Czosnyka, et al. "Hysteresis of the cerebrospinal pressure-volume curve in hydrocephalus." In Brain Edema XII. Springer Vienna, 2003. http://dx.doi.org/10.1007/978-3-7091-0651-8_108.

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Li, Wenguang. "Modelling the Viscoelastic Pressure-Volume Curve of the GB." In Biliary Tract and Gallbladder Biomechanical Modelling with Physiological and Clinical Elements. CRC Press, 2021. http://dx.doi.org/10.1201/9781003153986-11.

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Hardin, Charles Corey, Roger G. Spragg, and Atul Malhotra. "Surfactant Activity and the Pressure-Volume Curve of the Respiratory System." In Cardiopulmonary Monitoring. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-73387-2_17.

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Tütüncü, A. S., N. Çakar, Ĝ. Köprülü, F. Esen, and L. Telci. "Assessment of Pressure-Volume Curve of the Respiratory System in Mechanically Ventilated Patients with ARDS." In Advances in Experimental Medicine and Biology. Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0333-6_72.

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Gomes, Marcos E. "Pressure–Volume Curves." In Data Interpretation in Anesthesia. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55862-2_73.

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Turco, G. E., F. S. Moura, and E. D. L. B. Camargo. "Estimation of Alveolar Recruitment Potential Using Electrical Impedance Tomography Based on an Exponential Model of the Pressure-Volume Curve." In XXVII Brazilian Congress on Biomedical Engineering. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-70601-2_284.

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Servillo, G., M. Coppola, and R. Tufano. "Static and Dynamic Pressure — Volume Curves." In Anesthesia, Pain, Intensive Care and Emergency Medicine — A.P.I.C.E. Springer Milan, 2000. http://dx.doi.org/10.1007/978-88-470-2286-7_2.

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Stenqvist, O., and H. Odenstedt. "Alveolar Pressure/volume Curves Reflect Regional Lung Mechanics." In Yearbook of Intensive Care and Emergency Medicine. Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-49433-1_37.

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G. Hunt, Allen. "Pressure Saturation Curves and the Critical Volume Fraction for Percolation." In Percolation Theory for Flow in Porous Media. Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11430957_5.

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Xu, Kaili, Chang Gao, Tianqi He, and Shuhang Yan. "Performance Monitoring and Back Pressure Curve Calculation of Condenser." In Proceedings of the 23rd Pacific Basin Nuclear Conference, Volume 2. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-8780-9_31.

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Conference papers on the topic "Pressure-volume curve"

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Gerard, Franck, Patrick Dang, and James F. Mason. "Design Ananlysis of Polyamide-11 Liners: Operating Higher than the Critical Buckling Pressure." In CORROSION 2004. NACE International, 2004. https://doi.org/10.5006/c2004-04712.

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Abstract Numerous simple methods exist by which a designer may calculate the collapse pressure of a pipeline liner. While these methods appear to be useful for low-strain-yielding materials such as HDPE, they are limited in their ability to describe more elastic materials such as plasticized polyamide-11. A nonlinear finite element method has been developed that uses the full stress-strain curve of the polymer material to describe the material behavior, and calculate the critical bucking pressure and annulus volume at that pressure. If one knows the volume in the annulus during high pressure operation, it then becomes possible to calculate the maximum pre-decompression annulus pressure that would be allowed without exceeding the buckling point after maximum expansion of the annulus gas with pipeline decompression. This paper describes the method and limited experimental verification of the concept.

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Murthy, S., B. Suki, J. Herrmann, Z. Yuan, K. Peters, and D. W. Kaczka. "Personalized Pressure-Volume Curve of the Lung Through CT-Based Network Modeling." In American Thoracic Society 2021 International Conference, May 14-19, 2021 - San Diego, CA. American Thoracic Society, 2021. http://dx.doi.org/10.1164/ajrccm-conference.2021.203.1_meetingabstracts.a4617.

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Smith, B. W., S. Rees, J. Tvorup, C. G. Christensen, and S. Andreassen. "Modeling the influence of the pulmonary pressure-volume curve on gas exchange." In 2005 IEEE Engineering in Medicine and Biology 27th Annual Conference. IEEE, 2005. http://dx.doi.org/10.1109/iembs.2005.1616939.

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Zheng, B., X. Pang, M. Liu, and I. Joo. "Using a Fan Air Flow Station to Control Building Static Pressure in a Variable Volume Air Conditioning System." In ASME 2005 International Solar Energy Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/isec2005-76215.

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A fan airflow station measures airflow through a fan using fan speed, fan head, and the field-calibrated fan curve. This paper presents the theory and techniques of using fan airflow station in a variable volume system for building pressure control. These techniques include fan curve calibration, determination of the volumetric flow difference of the supply and return airflows, and sensor locations. The return fan speed profiles were plotted, and data was collected on building pressure after implementing the fan air flow station. The Implementation of a fan air flow station demonstrates that the return fan speed can track the supply fan speed profile as building loads change, such that building pressure is maintained within a satisfactory range.

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Srinivasan, Bharadwaj, and Stephen A. Idem. "Pressure Drop Testing of Corrugated Stainless Steel Pliable Gas Tubing (PLT)." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36668.

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Pressure loss tests were conducted on straight corrugated stainless steel pliable gas tubing (PLT) per I.S. EN 15266:2007 [1]. A power law least-squares curve fit was used to relate pressure loss per unit length as a function of volume flow rate. For every case considered the calculated coefficient of determination values exceeded 0.90, indicating suitable correlation. Based on the curve fit expressions gas discharge graphs for the volume flow that would yield a pressure loss of 1 mbar were generated as a function of PLT length and diameter. Darcy friction factors were calculated from test data for each case and plotted on the Moody diagram as a function of Reynolds number based on the minimum PLT cross section. For Reynolds numbers less than 2300 the pressure loss data for PLT yielded an inverse relationship between the Darcy friction factor and the Reynolds number. In those instances the proportionality coefficient equaled 49, which differs from the value of 64 that can be derived analytically for steady laminar flow in a uniform cross section horizontal pipe.

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Miura, Naoki, and Naoki Soneda. "Evaluation of Fracture Toughness by Master Curve Approach Using Miniature C(T) Specimens." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25862.

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The fracture toughness Master Curve gives a universal relationship between the median of fracture toughness and temperature in the ductile-brittle transition temperature region of ferritic steels such as reactor pressure vessel (RPV) steels. The Master Curve approach specified in the ASTM standard theoretically provides the confidence levels of fracture toughness in consideration of the inherent scatter of fracture toughness. The authors have conducted a series of fracture toughness tests for typical Japanese RPV steels with various specimen sizes and shapes, and ascertained that the Master Curve can be well applied to the specimens with the thickness of 0.4-inches or larger. Considering the possible application of the Master Curve method coexistent with the present surveillance program for operating RPVs, the utilization of miniature specimens which can be taken from broken halves of surveillance specimens is quite important for the efficient determination of the Master Curve from the limited volume of the materials of concern. In this study, fracture toughness tests were conducted for typical Japanese RPV steels, SFVQ1A forging and SQV2A plate materials, using the miniature C(T) specimens with the thickness of 4 mm following the procedure of the ASTM standard. The results showed that the differences in test temperature, evaluation method, and specimen size did not affect the Master Curves, and the fracture toughness indexed by the reference temperature, T0, obtained from miniature C(T) specimens were consistent with those obtained from standard and larger C(T) specimens. It was also found that valid reference temperature can be determined with the realistic number of miniature C(T) specimens, less than ten, if the test temperature was appropriately selected. Thus, the Master Curve method using miniature C(T) specimens could be a practical method to determine the fracture toughness of actual RPV steels.

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Palamarchuk, Evgenii, Tino Mengdehl, and Paul Uwe Thamsen. "Remarks on the Recirculation at the Outlet of a Radial Impeller Near Shut-Off." In ASME 2018 5th Joint US-European Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/fedsm2018-83462.

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Centrifugal pumps are characterized by the performance curves, showing the dependency between its main operating parameters for a range of external conditions. One of the most important curves is the head curve, which shows the dependency between the volume flow rate and the pressure head, induced by the pump. Stable operating conditions occur when the pump curve has a negative slope for the point of intersection with the system resistance curve (dH/dQ < 0). Most of the pump curves have a “stable” negative slope of the head curve for the most part of the possible operating range. Nevertheless, centrifugal pumps of low specific speed display a tendency to generate an unstable pump performance curve, especially if designed with a high head coefficient at the best efficiency point [1]. These curves are characterized by lowering the pressure head near the shut-off area (drooping curves). Operating range of such pumps could be significantly limited in the case of high static head component for the system resistance curve (firefighting applications) or parallel operation. The flow pattern for the part load conditions differs from the one by the optimum conditions. There are two recirculation zones, occurring at the inlet and at the outlet of the impeller [2]. This paper concentrates on the investigation of the pressureside recirculation and its influence on the curve slope. The pressure-side recirculation may have various position and intensity in the case of a radial impeller with an axis-parallel trailing edge [3, 4]. There are a few measures that influence positively the stability of the performance curve [3, 5]. The tests contain an experimental setup with comparison of experimental data to numerical simulations. Subject of the experimental investigations is a single volute radial centrifugal pump with a specific speed nq = 35 min−1. The casing was modified in order to provide optical access to the impeller outlet area. Radial velocity components are measured by using the Particle Image Velocimetry (hereafter: PIV) methods in order to define the backflow zones for the part load regimes. Measured operating points are then compared to numerical simulations carried out by Computational Fluid Dynamics (hereafter: CFD). The flow pattern gained by CFD allows analyzing the phenomena of the pressure side recirculation in detail, also in areas, where the access with measuring instruments is limited. The investigation is performed on two modifications of the pump impeller — applying the slots opening in the back shroud [2] and diagonal trimming of the impeller [5], as well as for the original (unmodified) case. The combination of the described methods gives a clear vision on the 3D recirculating structures for the cases of stable and unstable behavior of the curve.

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8

Bou Jawde, S. A. M., J. Herrmann, D. Casey, J. H. T. Bates, and B. Suki. "A Universal Pressure-Volume Curve Predicts Critical Roles of Collagen Waviness and Septal Wall Thickness in Alveolar Inflation Stability Across Species." In American Thoracic Society 2020 International Conference, May 15-20, 2020 - Philadelphia, PA. American Thoracic Society, 2020. http://dx.doi.org/10.1164/ajrccm-conference.2020.201.1_meetingabstracts.a5685.

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9

Chu, Hongyang, Jingxuan Zhang, Jiawei Li, et al. "Impact of Well Interference on Transient Pressure Behavior During Underground Gas Storage: A Comparative Study." In SPE Annual Technical Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/214780-ms.

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Abstract Underground natural gas storage (UGS) is key to achieving carbon neutrality and it is also a potential solution to the seasonal imbalance between gas supply and demand. To store or withdraw a large amount of natural gas within a specified time, wells in UGS projects often need to have high continuous injection and withdrawal capacities. High injection and withdrawal rates lead to uneven pressure distributions in UGS and substantial well interference. This paper proposes an analytical model to investigate the impact of well interference on transient pressure behavior in UGS wells. We used Laplace transforms and the Stehfest numerical inversion algorithm to obtain an analytical model of the pressure response of a vertical well in a UGS project. We used the superposition principle to model well interference effects, and we used a commercial numerical simulator to validate analytical solutions for different cases. Results show that the pressure behavior during interference depends mainly on the operational status of adjacent wells. When an adjacent well is withdrawing gas, interference causes the pressure derivative to first rise and then flatten later. When gas is injected into the adjacent well, the pressure derivative curve drops continuously and is similar to the shape for a well near a constant pressure boundary. The types of adjacent wells affect the rate of rise of the pressure derivative curve at later times. Interference with a target well is more likely when we inject into or produce gas from a vertical well than from a horizontal well. The application of our methodology is illustrated for the Hutubi UGS. Available data from nine cycles of injection and withdrawal in this UGS project indicate that the cumulative gas injection volume and the gas withdrawal volume were 155.43 × 108 m3 and 130.81 × 108 m3. The final gas storage volume eventually reached 93.5% of the designed UGS capacity.

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10

Ejim, C. E., H. M. Banjar, W. Y. Lee, and W. Zabala. "Evaluating Performance of 400 and 538 Series High-Speed High Gas-Volume-Fraction MultiPhase Pumps." In SPE Middle East Artificial Lift Conference and Exhibition. SPE, 2024. http://dx.doi.org/10.2118/221510-ms.

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Abstract High-speed operation of electric submersible pumps (ESPs) are becoming common practice in oilfield operations. Installing high-speed high gas volume fraction (GVF) multiphase pumps (MPPs) will facilitate production from wells with high gas content. This study uses gas-liquid parameters to obtain dimensionless curves from various physical tests of high-speed, high GVF MPPs. The application benefits include sizing by field and design personnel to ensure required production delivery at the desired MPP setting depths. Two high-speed, high GVF MPPs, with 4.00-inch and 5.38-inch housing diameters, were physically tested and operated at 6,000 revolutions per minute. For the 4.00-inch housing MPP, the intake pressure varied from 26 to 70 psig, whereas intake pressure was 46 psig for the 5.38-inch MPP. The range of water volume flow rate was 63 to 660 barrels per day (BPD), and intake GVF varied from about 84% to 98%. Energy and turbomachinery principles were applied to the test data to obtain dimensionless head and flow performance curves for each MPP. The curves were validated from estimating pump boost pressures. The results showed that the trend in variation of dimensionless head coefficient with the dimensionless volume flow rate depends on the method in which the tests were performed. For the 4-inch MPP, tested at constant liquid volume flow rate while varying intake pressures and GVF, the dimensionless head coefficient increased with increasing dimensionless volume flow rate. It was observed that all the dimensionless test data collapse on one another. For the 5.38-inch MPP, tested at constant intake pressure while varying liquid and gas volume flow rates, the dimensionless head coefficient decreased with increasing dimensionless volume flow rate. All the dimensionless test data for the pump were also observed to collapse on one another. Validation of the dimensionless performance curve for each MPP showed that the curves can be used to determine, with good accuracy, dimensionless head coefficients and corresponding pump boost pressures for given flow and operating conditions. In conclusion, the method presented in this study has beneficial field design application in establishing performance of high-speed MPPs operating in high GVF environments. This study highlights the benefits of obtaining dimensionless characteristics in general and specifically for high-speed, high-GVF MPPs, using fundamental, physics-based techniques. Application of the performance curves obtained from this technique can be used by design engineers and field personnel to size high-speed, high-intake GVF MPPs operating at any setting depths. This is beneficial to the operator to optimize production and maximize the economic bottom-line from the field asset.

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Reports on the topic "Pressure-volume curve"

1

Narusawa, Uichiro. Quantitative Characterization of Pulmonary Pressure-Volume Curve for Improved Care of Acute Lung Injury. Defense Technical Information Center, 2003. http://dx.doi.org/10.21236/ada418013.

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2

Narusawa, Uichiro. Quantitative Characterization of Pulmonary Pressure-Volume Curve for Improved Care of Acute Lung Injury. Defense Technical Information Center, 2003. http://dx.doi.org/10.21236/ada422532.

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