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Journal articles on the topic 'Annular sealant'

Author: Grafiati

Published: 4 June 2021

Last updated: 5 February 2022

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1

Torkian, Pooya, Keivan Daneshvar, Ebrahim Taherian, Yasaman Rezaeifar, and Shahram Akhlaghpoor. "Fibrin sealants in lumbar annuloplasty after endoscopic discectomy as a method to prevent recurrent lumbar disc herniation." European Journal of Translational Myology 30, no. 2 (2020): 325–33. http://dx.doi.org/10.4081/ejtm.2020.8748.

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Fibrin sealant as a promising agent for providing scaffold and efficient hemostasis is widely accepted in several specialties. However, the outcome of Fibrin sealants in lumbar annuloplasty after endoscopic discectomy has not been evaluated in patients with disc herniation. The goal of this study was to evaluate the efficacy, response, and probability of future recurrence rates in herniated nucleus pulposus (HNP) with the use of fibrin sealant in conjunction with endoscopic disc surgery. A total of 35 patients (28 men, 7women) were evaluated, including 18 patients who underwent endoscopic disc

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2

Gunnarsson, Bengt, Sven Harald Tønnesen, Eugen Olsen, and Yuting Leong. "Technology Update: New Tool and Sealant Technology Expedites Annular Isolation Tasks." Journal of Petroleum Technology 68, no. 07 (2016): 20–21. http://dx.doi.org/10.2118/0716-0020-jpt.

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3

Dzhus, Andriy, Liubomyr Romanyshyn, Vasyl Mykhailiuk, and Yurii Mosora. "The use of simulation modeling in the design of elements of annular preventers." New Trends in Production Engineering 2, no. 1 (2019): 295–303. http://dx.doi.org/10.2478/ntpe-2019-0031.

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Abstract One of the main elements of control over wells in the process of their construction is the blowout equipment, which includes annular preventers. This also applies to wells that provide degassing of coal veins to reduce their gas dynamic activity. Modern technology of work requires expansion of the functionality of the sealing unit of the annular preventers with the simultaneous provision of its operational characteristics. Determining the necessary durability of seals for different operating modes is the study of their stress-strain state. The paper deals with the possibility of using

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4

Pauza, Kevin, Carrie Wright, and Adam Fairbourn. "Treatment of annular disc tears and “leaky disc syndrome” with fibrin sealant." Techniques in Regional Anesthesia and Pain Management 19, no. 1-2 (2015): 45–49. http://dx.doi.org/10.1053/j.trap.2016.09.008.

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5

Jimenez, Walmy Cuello, Robert Darbe, and Xueyu Pang. "Enhanced Mechanical-Integrity Characterization of Oilwell Annular Sealants Under In-Situ Downhole Conditions." SPE Journal 24, no. 05 (2019): 2308–19. http://dx.doi.org/10.2118/185341-pa.

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Summary In this study, we describe an innovative and novel methodology comprising a high–pressure/high–temperature (HP/HT) in–situ–triaxial–testing apparatus for the measurement of sealant mechanical properties (i.e., compressive strength, Young's modulus, and tensile strength) under simulated downhole conditions. The equipment can be used to perform both curing and testing using the same apparatus, thus eliminating depressurization and cooling of test specimens. Additionally, at minimum, three samples can be tested sequentially for statistical analysis and uncertainty mitigation, along with p

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6

Tahmourpour, Farzad, Khaled Hashki, and Hassan I. El Hassan. "Different Methods To Avoid Annular Pressure Buildup by Appropriate Engineered Sealant and Applying Best Practices (Cementing and Drilling)." SPE Drilling & Completion 25, no. 02 (2010): 248–52. http://dx.doi.org/10.2118/110040-pa.

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7

Gustieliev, Оleksandr. "Sealing materials effectiveness evaluation in the repair of bituminous-concrete surface with transversal cracks." ACADEMIC JOURNAL Series: Industrial Machine Building, Civil Engineering 1, no. 52 (2019): 166–69. http://dx.doi.org/10.26906/znp.2019.52.1703.

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The method of sealing materials effectiveness evaluation in the repair of bituminous-concrete surface with transversal cracksis offered. Calculation schemes and mathematical models based on the application of the thermo-viscous-elasticity theory forthe prediction of temperature stresses in the sealing material at the contact with the bituminous-concrete surface, taking intoaccount the thermal-technical and thermorheological properties of the materials and the geometric parameters of the bituminous-concreteslabs and the transversal crack. The obtained analytical dependences allow to estimate th

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8

Griffin, S. O., E. Oong, W. Kohn, et al. "The Effectiveness of Sealants in Managing Caries Lesions." Journal of Dental Research 87, no. 2 (2008): 169–74. http://dx.doi.org/10.1177/154405910808700211.

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A barrier to providing sealants is concern about inadvertently sealing over caries. This meta-analysis examined the effectiveness of sealants in preventing caries progression. We searched electronic databases for comparative studies examining caries progression in sealed permanent teeth. We used a random-effects model to estimate percentage reduction in the probability of caries progression in sealed vs. unsealed carious teeth. Six studies, including 4 randomized-controlled trials (RCT) judged to be of fair quality, were included in the analysis (384 persons, 840 teeth, and 1090 surfaces). The

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9

MATSUZAKI, Yoshio, Koichi FUNABASHI, and Kazuo HOSOKAWA. "Sealing Characteristics of an Annular Wedge-Shaped Gasket." Transactions of the Japan Society of Mechanical Engineers Series C 58, no. 551 (1992): 2186–91. http://dx.doi.org/10.1299/kikaic.58.2186.

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10

Carbonell-Blasco, Pilar, José Miguel Martín-Martínez, and Iulian Vasile Antoniac. "Synthesis and characterization of polyurethane sealants containing rosin intended for sealing defect in annulus for disc regeneration." International Journal of Adhesion and Adhesives 42 (April 2013): 11–20. http://dx.doi.org/10.1016/j.ijadhadh.2012.11.011.

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11

Park, Jeong Yoon. "Comparative Assessment of Different Percutaneous Endoscopic Interlaminar Lumbar Discectomy (PEID) Techniques." Pain Physician 4;16, no. 4;7 (2013): 359–67. http://dx.doi.org/10.36076/ppj.2013/16/359.

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Background: Percutaneous endoscopic lumbar discectomy is a common surgical treatment for lumbar disc herniation, and percutaneous endoscopic interlaminar lumbar discectomy (PEID) is commonly used for direct decompression of L5-S1. Like microdiscectomy, recurrence of herniation after endoscopic discectomy is an important problem. In this study, we aimed to decrease the recurrence after PEID using a new surgical technique. Objectives: We propose a new surgical technique for reducing the recurrence after PEID for lumbar disc herniation. The new technique uses annular sealing after fragmentectomy.

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12

Kimura, H., and S. Nonaka. "Flexural Rigidity of Annular Flange Connections." Journal of Pressure Vessel Technology 120, no. 2 (1998): 164–69. http://dx.doi.org/10.1115/1.2842235.

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In order to analyze the vibration of a structure whose elements are connected with bolts, it is necessary to estimate the flexural rigidity of bolted connections. Some studies have been reported on annular flange connections subjected to external bending moments. In these studies, the bolt axial force and the sealing performance are examined in detail, but their flexural rigidity is not sufficiently discussed. This paper deals with a calculation method to estimate the flexural rigidity of bolted annular flange connections subjected to external bending moments. In the analysis, a model for esti

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13

Zhuo Wang and Yong Xu. "Theoretical and Experimental Study of Annular-Plate Self-Sealing Structures." Journal of Microelectromechanical Systems 17, no. 1 (2008): 185–92. http://dx.doi.org/10.1109/jmems.2007.911371.

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14

Xiao, Wensheng, Chao Hou, Jian Liu, Bo Luan, and Hongyan Wang. "Structure Optimization and Performance Analysis of Subsea High Pressure Wellhead Metal Seal." Open Mechanical Engineering Journal 9, no. 1 (2015): 564–68. http://dx.doi.org/10.2174/1874155x01509010564.

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Security and reliability are the main focus of annular metal seal assembly. It is concluded that the factors influence sealing performance of annular metal seal assembly most in view of working conditions of annular metal seal assembly. Taking major influencing factors with response surface method (RSM) analysis, and determining coefficient of regression analysis with finite element method (ANSYS) experiment. Second-order corresponding model is established and the best corresponding interval is concluded. Getting the reasonable values of bulge radius r and loading F on the premise of guarantee

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15

Lee, Jung-Sup, Hyeun-Sung Kim, Jee-Soo Jang, and Il-Tae Jang. "Structural Preservation Percutaneous Endoscopic Lumbar Interlaminar Discectomy for L5-S1 Herniated Nucleus Pulposus." BioMed Research International 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/6250247.

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Objective. Structures such as ligamentum flavum, annulus, and lamina play an important role in the segmental function. We proposed the surgical technique for achieving the sufficient preservation of segmental structures, in spite of sufficient removal of pathologic disc in the L5-S1 using the ligamentum flavum splitting and sealing technique.Methods. We retrospectively analyzed 80 cases that underwent percutaneous endoscopic lumbar discectomy for L5-S1 herniated nucleus pulposus, using the ligamentum flavum splitting and sealing technique between January 2011 and June 2013. Outcomes were asses

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16

Deng, Hao, Cunyun Pan, Xiaojun Xu, and Xiang Zhang. "A twin-rotor piston engine with annular connecting chambers." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 227, no. 5 (2012): 1080–89. http://dx.doi.org/10.1177/0954406212455758.

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An effort in progress to develop a new twin-rotor piston engine is described. A proposition of sealing, which benefits from the conventional piston-cylinder structure is presented. A six-stroke twin-rotor piston engine, which is designed to have coolant intake and drain stroke is proposed. A differential velocity drive mechanism, which controls the rotors’ oscillation, is invented. The differential velocity drive mechanism utilizes novel kinematic design to completely eliminate inertial loads. The twin-rotor engine is expected to have three key technical advantages for attaining higher power d

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17

KRESTIN, Evgeny A. "UNSTEADY HYDRODYNAMIC PROCESSES IN THE SLIT GAPS NONCONTACT SEALS IN A STEP CHANGE IN PRESSURE." Urban construction and architecture 5, no. 1 (2015): 100–106. http://dx.doi.org/10.17673/vestnik.2015.01.15.

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Determination of leakage of fluid through the slotted annular gaps in dynamic studies leads to the discrepancy between the theoretical and experimental results. This discrepancy is particularly large for non-stationary processes in hydraulic systems. Dynamic characteristics of annular sealing cracks in a typical non-contact seals in stepwise (unit step) change of pressure are found. The velocity profile, the flow of leaks, the force of viscous friction on the channel wall are determined, the relaxation during the defined transition and the weighting function of the sealing gap are viewed.

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18

KRESTIN, Evgeny Aleksandrovich. "DYNAMIC CALCULATION OF NON-CONTACT SEALS GAPS AT PULSE PRESSURE CHANGES DURING LEAKAGE FLOW RATING." Urban construction and architecture 5, no. 2 (2015): 100–106. http://dx.doi.org/10.17673/vestnik.2015.02.16.

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Detection of leakage fl ow through slott ed annular gaps in dynamic studies leads to the discrepancy between theoretical and experimental results. This discrepancy is particularly large for non-stationary processes in hydraulic systems. Dynamic characteristics of annular sealing cracks of contactless seals in a typical single pulse action of pressure are found. The velocity profi le in the gap is viewed, leakage fl ow is rated, the force of viscous friction at the channel wall is calculated, the relaxation current is considered, the weight function of the sealing gap is determined.

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19

Likhitpanichkul, Morakot, Yesul Kim, Olivia M. Torre та ін. "Fibrin-genipin annulus fibrosus sealant as a delivery system for anti-TNFα drug". Spine Journal 15, № 9 (2015): 2045–54. http://dx.doi.org/10.1016/j.spinee.2015.04.026.

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20

Noda, Nao-Aki, Masato Nagawa, Fumitaka Shiraishi, and Akifumi Inoue. "Sealing Performance of New Gasketless Flange." Journal of Pressure Vessel Technology 124, no. 2 (2002): 239–46. http://dx.doi.org/10.1115/1.1464876.

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This paper deals with a new seal system between two flanges without using gaskets. The system includes a groove and an annular lip that is held by one of the flange with its highest point in contact with the other flange to form a seal line when the flanges are assembled. The condition whether the system leaks or not depends on the shape and dimension of the annular lip and its deformation during the contact. In this study, several gasketless flanges are prepared with different lip dimensions to investigate the contact and sealing condition through an experimental and FEM analyses. The analyse

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21

Giasuddin, Haider M., Jay G. Sanjayan, and P. G. Ranjith. "Analysis of Interfacial Debonding of Geopolymer Annular Sealing in CO2 Geo-sequestration Wellbore." Energy Procedia 37 (2013): 5681–91. http://dx.doi.org/10.1016/j.egypro.2013.06.490.

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22

Zhai, Lulu, Zhang Zhenjie, Chi Zhonghuang, and Guo Jia. "Dynamic analysis of liquid annular seals with herringbone grooves on the rotor based on the perturbation method." Royal Society Open Science 5, no. 6 (2018): 180101. http://dx.doi.org/10.1098/rsos.180101.

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Annular seals have significant effects on the hydraulic and rotordynamic performances of turbomachinery. In this paper, an analysis method for calculating the leakage flow rates and dynamic characteristics of liquid annular seals with herringbone grooves on the rotor is proposed and verified. Leakage flow rates and dynamic characteristics of the model seals under different operating conditions are theoretically analysed and compared with those of plain and spiral-grooved seals of the same size. In addition, the influence of geometric parameters such as spiral angle and the lengths of the const

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23

Tarasevich, Yulia, and Anna Savchenko. "Determination of Reliability of Rotor-Annular Seals System by Theory of Runs of Random Functions." Applied Mechanics and Materials 630 (September 2014): 350–55. http://dx.doi.org/10.4028/www.scientific.net/amm.630.350.

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The paper discusses forced combined angular-radial oscillations of rotor centrifugal pump model under the influence of random forcings. System reliability is evaluated using the theory of random functions runs: the probability of finding a random vector of quality system “rotor-annular seals” in the range of admissible values of its parameters is determined. Evaluation of the influence of erosive wear of sealing surfaces in the process of pump operating on reliability system is made.

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Li, Ying, Peng Yun Song, and Heng Jie Xu. "Performance Analyses of the Spiral Groove Dry Gas Seal with Inner Annular Groove." Applied Mechanics and Materials 420 (September 2013): 51–55. http://dx.doi.org/10.4028/www.scientific.net/amm.420.51.

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In order to improve the performance of the spiral groove dry gas seal (S-DGS), the spiral groove dry gas seal with an inner annular groove (AS-DGS) was invented. Based on the narrow groove theory, the sealing performance parameters of the AS-DGS were gained by using approximate analytical method to solve the gas film pressure control equations, and the results were compared with those of the common S-DGS. The results show that, in the given operating conditions, the opening force of AS-DGS is smaller than that of the S-DGS with the difference less than 0.5%, and the film stiffness is larger th

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25

Awad, Hesham, Jorge Parrondo, and Víctor González. "Vibrations in Leaking Spherical Valves with Annular Seal." Proceedings 2, no. 23 (2018): 1444. http://dx.doi.org/10.3390/proceedings2231444.

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Hydroelectric power plants are used worldwide to cover varying electricity demands. The Salime hydroelectric power plant, which is located at Asturias, Spain, has four hydro turbines with a total design capacity of 128 MW. Each turbine has a ball valve with two maintenance seals to ensure a closure as complete as possible when the group ceases to operate. Unfortunately, at some occasions the seals did not really perform their sealing function properly, but started to develop periodic vibrations of indefinite duration. This phenomenon generates periodic leakage flow as well as high amplitude pr

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26

YANG, Hai, Liangliang DONG, XiangJun YU, et al. "Study on sensitivity of annular BOP parameters to sealing performance in gas well snubbing service." Mechanical Engineering Journal 8, no. 2 (2021): 20–00533. http://dx.doi.org/10.1299/mej.20-00533.

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27

Zhang, Bin, Haocen Hong, Min Yu, and Huayong Yang. "Leakage analysis and ground tests of knife edge indium seal to lunar sample return devices." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233, no. 6 (2018): 2010–22. http://dx.doi.org/10.1177/0954410018768425.

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This work deals with the lunar sample return project, which requires lunar samples to be returned back to the ground without contamination. In this paper, a knife edge indium seal is proposed as a primary sealing form, where indium–silver alloy is welded into an annular groove of a cylindrical container firstly and then extruded by an annular knife edge of a cylindrical lid. The analysis of the leakage and sealing reliability of knife edge indium seal is the main aim of this paper. Firstly, the pretreatment of knife edge indium seal is discussed. Key techniques on indium welding are studied to

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28

Wasch, Laura, and Mariëlle Koenen. "Injection of a CO2-Reactive Solution for Wellbore Annulus Leakage Remediation." Minerals 9, no. 10 (2019): 645. http://dx.doi.org/10.3390/min9100645.

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Driven by concerns for safe storage of CO2, substantial effort has been directed on wellbore integrity simulations over the last decade. Since large scale demonstrations of CO2 storage are planned for the near-future, numerical tools predicting wellbore integrity at field scale are essential to capture the processes of potential leakage and assist in designing leakage mitigation measures. Following this need, we developed a field-scale wellbore model incorporating (1) a de-bonded interface between cement and rock, (2) buoyancy/pressure driven (microannulus) flow of brine and CO2, (3) CO2 diffu

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29

Childs, D., D. Elrod, and K. Hale. "Annular Honeycomb Seals: Test Results for Leakage and Rotordynamic Coefficients; Comparisons to Labyrinth and Smooth Configurations." Journal of Tribology 111, no. 2 (1989): 293–300. http://dx.doi.org/10.1115/1.3261911.

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Test results are presented for leakage and rotordynamic coefficients for seven honeycomb seals. All seals have the same radius, length, and clearance; however, the cell depths and diameters are varied. Rotordynamic data, which are presented, consist of the direct and cross-coupled stiffness coefficients and the direct damping coefficients. The rotordynamic-coefficient data show a considerable sensitivity to changes in cell dimensions; however, no clear trends are identifiable. Comparisons of test data for the honeycomb seals with labyrinth and smooth annular seals shows the honeycomb seal had

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30

Kvist, Roger. "Sealing and sealing methods in the Bay of Bothnia, 1551–70." Polar Record 27, no. 163 (1991): 339–44. http://dx.doi.org/10.1017/s0032247400013097.

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AbstractSeals were hunted in the Bay of Bothnia during the 16th century in four areas — inshore open water, fast ice, ice edge, and pack ice — with methods appropriate for each area. Inshore open water sealing involved netting and some seining, exclusively for ringed seals. On fast ice the techniques used were stalking, den-hunting, and breathing hole-hunting, again for ringed seals. Grey and ringed seals were hunted on the ice edge. Provincial tax returns have provided information on methods used by sealers from different parishes in the Bay of Bothnia area. Catching techniques, tools, prey s

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Villasmil, Larry A., Dara W. Childs, and Hamn-Ching Chen. "Understanding Friction Factor Behavior in Liquid Annular Seals With Deliberately Roughened Surfaces." Journal of Tribology 127, no. 1 (2005): 213–22. http://dx.doi.org/10.1115/1.1828071.

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Multistage centrifugal pumps and compressors are among the most widely used pieces of rotating machinery in industry. A typical application demands the arrangement of several impellers or wheels mounted on a shaft that spins within a stationary case. Annular seals are the most common sealing devices used in this type of machinery. The annular seal design affects both (i) machinery performance in terms of energy conversion efficiency, and (ii) stability due to the interaction within the rotor and the stator through the fluid flow within the seals. Traditionally, the “bulk-flow” theory due to Hi

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32

Guterl, Clare C., Olivia M. Torre, Devina Purmessur, et al. "Characterization of Mechanics and Cytocompatibility of Fibrin-Genipin Annulus Fibrosus Sealant with the Addition of Cell Adhesion Molecules." Tissue Engineering Part A 20, no. 17-18 (2014): 2536–45. http://dx.doi.org/10.1089/ten.tea.2012.0714.

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33

Martsynkovskyy, Volodymyr, Andrzej Korczak, and Czeslaw Kundera. "The Centrifugal Pump with the Impeller Supported in Sealing Clearances." Advanced Materials Research 874 (January 2014): 83–88. http://dx.doi.org/10.4028/www.scientific.net/amr.874.83.

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The paper presents the construction of single-staged centrifugal pump with the impeller supported in longitudinal and transversal sealing clearances. In the state of equilibrium the impeller is supported by axial and radial forces and moments of pressure, which occur on both sides of the impeller in annular clearances. In the result the impeller adopts optimal non-contact position in which all the external forces that works on this are in balance. A description of the statics and the dynamics of the impeller has been presented.

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34

Gentilhomme, O., N. J. Hills, A. B. Turner, and J. W. Chew. "Measurement and Analysis of Ingestion Through a Turbine Rim Seal." Journal of Turbomachinery 125, no. 3 (2003): 505–12. http://dx.doi.org/10.1115/1.1556411.

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Experimental measurements from a new single stage turbine are presented. The turbine has 26 vanes and 59 rotating blades with a design point stage expansion ratio of 2.5 and vane exit Mach number of 0.96. A variable sealing flow is supplied to the disk cavity upstream of the rotor and then enters the annulus through a simple axial clearance seal situated on the hub between the stator and rotor. Measurements at the annulus hub wall just downstream of the vanes show the degree of circumferential pressure variation. Further pressure measurements in the disk cavity indicate the strength of the swi

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35

Sakuma, Shihoko, Akihiro Yoshihara, Hideo Miyazaki, and Seigo Kobayashi. "Economic Evaluation of a School-based Combined Program with a Targeted Pit and Fissure Sealant and Fluoride Mouth Rinse in Japan." Open Dentistry Journal 4, no. 1 (2010): 230–36. http://dx.doi.org/10.2174/1874210601004010230.

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Background: In Niigata prefecture, Japan, a system has been developed based on a school-based fluoride mouth rinse program as follows; students with caries susceptible teeth are screened in a school dental examination, and encouraged to receive sealant placement in local dental clinics. However, the cost-effectiveness of sealant application in the public health has been questioned. The aim of this study was to estimate of the cost-effectiveness and cost-benefit ratio for a school-based combined program with fluoride mouth rinse and targeted fissure sealant in children residing in non-fluoridat

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Bru Revert, Anna, Paul F. Beard, and John W. Chew. "Flow and Ingestion in a Turbine Disc Cavity under Rotationally-Dominated Conditions." International Journal of Turbomachinery, Propulsion and Power 6, no. 3 (2021): 29. http://dx.doi.org/10.3390/ijtpp6030029.

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An investigation of hot gas ingestion driven by the disc pumping effect in a chute seal was conducted at the Oxford Rotor Facility. Measurements of mean pressure, unsteady pressure and gas concentration have been logged and analysed under different operating conditions. The sensitivity of mean cavity pressure coefficient, frequency spectra of the unsteady pressures and sealing effectiveness to changing conditions of purge flow, annulus flow, rotor disc speed and seal clearance have been studied. The steady pressures revealed the development of two vortices in the cavity, induced by the sharp c

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Efimov, Konstantin V., Evgeny N. Egorov, Nikolay F. Ushmarin, and Nikolay I. Koltsov. "Effect of hydrosorption polymers on the properties of water-swellable rubber." Butlerov Communications 64, no. 10 (2020): 90–93. http://dx.doi.org/10.37952/roi-jbc-01/20-64-10-90.

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Currently, in the oil and gas industry there is a growing demand for sealing elements capable of limited swelling upon contact with water and sealing the annular space of certain sections of the well. The swelling capacity of the sealing elements is predetermined by a well-chosen combination of polymer base and targeted functional ingredients. At the moment, a big drawback of water-swellable sealing elements is the loss of their sealing ability due to the washing out of hydrosorption additives from the sealing element. In this regard, in this work, the effect of hydrosorption polymers (polyacr

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Rzepka, Marcin, and Miłosz Kędzierski. "Badania procesu żelowania zaczynów cementowych przeznaczonych do uszczelniania otworów przewiercających płytkie poziomy gazonośne." Nafta-Gaz 77, no. 4 (2021): 235–43. http://dx.doi.org/10.18668/ng.2021.04.03.

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The article presents issues related to the sealing slurry technology concerning gelling processes (i.e., static built-up of gel strength of cement slurries). Based on research conducted around the world, it can be concluded that the rate of gelling of the cement slurry has an important role in the process of preventing possible gas exhalations from the annular space. After the cement slurry is pumped into the borehole (especially in zones with shallow gas horizons), the so-called migration (exhalation) of the formation medium (i.e. uncontrolled outflow of e.g. gas from the annular space) may o

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Lipschitz, A. "A Zero-Leakage Film Riding Face Seal." Journal of Tribology 107, no. 3 (1985): 326–30. http://dx.doi.org/10.1115/1.3261063.

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A new [1] zero-leakage film riding mechanical face seal is presented. The seal serves as a static-contacting seal while the machine shaft is in stand-still and turns into a film riding dynamic seal by lifting off the rotor surface to a few micro-meters gap once motion has begun. The dynamic sealing as well as lifting capabilities stem from inter-connected hydro-dynamic bearings which are circumferentially distributed around the annular stator face. Approximate calculations together with preliminary experimental results are shown and analyzed.

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40

Knappett, Peter S. K., Larry D. McKay, Alice Layton, et al. "Unsealed tubewells lead to increased fecal contamination of drinking water." Journal of Water and Health 10, no. 4 (2012): 565–78. http://dx.doi.org/10.2166/wh.2012.102.

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Bangladesh is underlain by shallow aquifers in which millions of drinking water wells are emplaced without annular seals. Fecal contamination has been widely detected in private tubewells. To evaluate the impact of well construction on microbial water quality 35 private tubewells (11 with intact cement platforms, 19 without) and 17 monitoring wells (11 with the annulus sealed with cement, six unsealed) were monitored for culturable Escherichia coli over 18 months. Additionally, two ‘snapshot’ sampling events were performed on a subset of wells during late-dry and early-wet seasons, wherein the

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Kremieniewski, Marcin, Sławomir Błaż, Stanisław Stryczek, Rafał Wiśniowski, and Andrzej Gonet. "Effect of Cleaning the Annular Space on the Adhesion of the Cement Sheath to the Rock." Energies 14, no. 16 (2021): 5187. http://dx.doi.org/10.3390/en14165187.

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Drilling boreholes in gas zones and in zones with the possibility of migration or gas exhalation requires a high index of well tightness. An important parameter determining the effectiveness of sealing the annular space is the adhesion of the cement sheath to the rock formation. Low values of adhesion of the cement sheath to the rock formation and to the casing surface result in the formation of uncontrolled gas flows. The lack of adhesion also reduces the stabilization of the pipe column. To obtain the required adhesion, the annular space should be properly cleaned. Thorough removal of filter

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Giannadakis, E., D. Papoulias, A. Theodorakakos, and M. Gavaises. "Simulation of cavitation in outward-opening piezo-type pintle injector nozzles." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 222, no. 10 (2008): 1895–910. http://dx.doi.org/10.1243/09544070jauto728.

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The onset and development of cavitation in the annular needle seat passage of piezo-driven outward-opening pintle injector nozzles used with spray-guided direct-injection gasoline engines are studied using a Eulerian-Lagrangian computational fluid dynamics cavitation model. Cavitation is formed because of the fluid acceleration taking place at the needle sealing area and it has been found to be affected by its geometric details. Various submodels for nucleation and bubble formation, further bubble growth and collapse, as well as bubble break-up and transport are incorporated into the model. Qu

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Tadakamadla, Santosh K., Ratilal Lalloo, Jeroen Kroon, and Newell W. Johnson. "Surface-Specific Caries Preventive Effect of an Intervention Comprising Fissure Sealant, Povidone-Iodine and Fluoride Varnish in a Remote Indigenous Community in Australia." International Journal of Environmental Research and Public Health 17, no. 6 (2020): 2114. http://dx.doi.org/10.3390/ijerph17062114.

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This study evaluates the effect of a topical intervention comprising of fissure sealant, povidone-iodine, and fluoride varnish in preventing caries on occlusal, approximal, and smooth surfaces. This three-year clinical trial was conducted in a remote Indigenous community of Australia. All schoolchildren (age range: 4–17) were invited to participate; those with parental consents to receive three-annual epidemiological examinations and interventions constituted the experimental group, while those with consents for only the epidemiological examination formed a comparison group. The intervention g

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Cao, C., J. W. Chew, P. R. Millington, and S. I. Hogg. "Interaction of Rim Seal and Annulus Flows in an Axial Flow Turbine." Journal of Engineering for Gas Turbines and Power 126, no. 4 (2004): 786–93. http://dx.doi.org/10.1115/1.1772408.

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A combined computational fluid dynamics (CFD) and experimental study of interaction of main gas path and rim sealing flow is reported. The experiments were conducted on a two stage axial turbine and included pressure measurements for the cavity formed between the stage 2 rotor disk and the upstream diaphragm for two values of the diaphragm-to-rotor axial clearance. The pressure measurements indicate that ingestion of the highly swirling annulus flow leads to increased vortex strength within the cavity. This effect is particularly strong for the larger axial clearance. Results from a number of

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Shrestha, Prateek M., Jamie L. Humphrey, Kelsey E. Barton, et al. "Impact of Low-Income Home Energy-Efficiency Retrofits on Building Air Tightness and Healthy Home Indicators." Sustainability 11, no. 9 (2019): 2667. http://dx.doi.org/10.3390/su11092667.

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We studied 226 low-income households as a part of the Colorado Home Energy Efficiency and Respiratory Health (CHEER) study to investigate the relationship between energy-efficiency retrofits (EERs) specific to air sealing of residential building envelopes, annual average infiltration rates (AAIR), and qualitative indicators of “healthy” homes. Blower door tests quantified the leakage area in each home, which was used to estimate the AAIR. Walk-through inspections were used to record observations of air-sealing retrofits conducted as part of Colorado’s Weatherization Assistance Program and indi

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Innes, N. P. T., D. J. P. Evans, and D. R. Stirrups. "Sealing Caries in Primary Molars." Journal of Dental Research 90, no. 12 (2011): 1405–10. http://dx.doi.org/10.1177/0022034511422064.

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The Hall Technique (HT) is a method for managing carious primary molars. Decay is sealed under pre-formed metal crowns without any caries removal, tooth preparation, or local anesthesia. The aim of this study was to compare HT clinical/radiographic failure rates with General Dental Practitioners’ (GDPs) standard (control) restorations. We conducted a split-mouth, randomized control trial (132 children, aged 3-10 yrs, GDPs n = 17) in Scotland. There were 264 study teeth with initial lesions, 42% of which were radiographically > half-way into dentin, and 67% of which had Class II restorations

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Stoertz, Mary W., Michael L. Hughes, Nathaniel S. Wanner, and Mitchell E. Farley. "Long-term water quality trends at a sealed, partially flooded underground mine." Environmental and Engineering Geoscience 7, no. 1 (2001): 51–65. http://dx.doi.org/10.2113/gseegeosci.7.1.51.

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Abstract An abandoned underground coal mine complex in southeastern Ohio was hydraulically sealed in 1980 by a 300-m long subsurface clay dike and mine-entry seals near the down-dip coal outcrop. Clay plugs also were emplaced in separate entries at a higher elevation than the dike. The intent was to flood the mine to decrease acid mine drainage. A few months after construction, an entry-seal clay plug blew out at an elevation corresponding to 85-90 percent inundation, and drains in natural materials supporting the dike began flowing, indicating leakage through or around the dike. Given these e

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An, F. H., and Y. P. Cheng. "An explanation of large-scale coal and gas outbursts in underground coal mines: the effect of low-permeability zones on abnormally abundant gas." Natural Hazards and Earth System Sciences Discussions 1, no. 5 (2013): 4751–75. http://dx.doi.org/10.5194/nhessd-1-4751-2013.

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Abstract. Large-scale coal and gas outbursts post a risk of fatal disasters in underground mines. Large-scale outbursts (outburst of coal and rock greater than 500 t) in recent years in China indicate that there is abundant gas in areas of outbursts containing large amounts of potential energy. The adequate sealing properties of the roof and floor of a coal seam are required for local abundant gas around the site of an outburst, but an annular low-permeability zone in a coal seam, which prevents the loss by gas migration through the coal seam itself, is also required. The distribution of coal

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Gong, Yan Nian, Jin Dan Yin, Chi Ai, and Yong Kun Zhang. "Block Mechanism of Microclearance Block Liquid and Lifting Height Calculating." Advanced Materials Research 430-432 (January 2012): 1970–73. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.1970.

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Mechanical seal mechanism was applied to study block mechanism of gaswell microclearance block liquid for the first time, which explained block mechanism of microclearance block liquid. The paper has built a block physical model of microclearance block liquid and has got calculation formulas of the block liquid lifting height. Then the block liquid lifting heights were calculated and analyzed in different microclearance widths and pressures. The sealing effect of the block liquid was discussed. The analyzed results showed that sealing effect of the block liquid was very obvious when microclear

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Yan, Hongwei, Xiong Yang, Xiangrong Hou, Lu Wang, and Pengcheng Li. "Research on the Performance of a New External Occlusion Device for Pressure Vessel Leakage." Strojniški vestnik – Journal of Mechanical Engineering 66, no. 11 (2020): 668–76. http://dx.doi.org/10.5545/sv-jme.2020.6810.

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Given the advantages and disadvantages of the existing plugging technology, a new type of external sealing device for pressure vessel leakage is proposed, which has the advantages of fast installation speed, small installation resistance, and stronger adaptability to the leakage surface. The connecting rod propulsion mechanism provides power, uses the fluidity of materials in the annular cavity to adapt to the complex curved surface, and carries out real-time monitoring and self-healing of the plugging process. Through the establishment of a finite element model of conventional top pressure pl

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