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Academic literature on the topic 'Labyrinths Models'

Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Labyrinths Models"

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Otsuka, K., M. Suzuki, M. Negishi, S. Shimizu, T. Inagaki, U. Konomi, T. Kondo, and Y. Ogawa. "Efficacy of physical therapy for intractable cupulolithiasis in an experimental model." Journal of Laryngology & Otology 127, no. 5 (April 10, 2013): 463–67. http://dx.doi.org/10.1017/s0022215113000698.

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AbstractObjective:To investigate what kinds of stimuli are effective in detaching otoconia from the cupula in three experimental models of cupulolithiasis.Methods:Three experimental models of cupulolithiasis were prepared using bullfrog labyrinths. Three kinds of stimuli were applied to the experimental models. In experiment one (gravity), the labyrinth preparation was placed so that the cupula-to-crista axis was in the horizontal plane with the canal side in the downward position. In experiment two (sinusoidal oscillation), the labyrinth preparation was placed 3 cm from the rotational centre of a turntable, which was sinusoidally rotated with a rotational cycle of 1 Hz and a rotational angle of 30°. In experiment three (vibration), mechanical vibration was applied to the surface of the bony capsule around the labyrinth using a surgical drill.Results:In experiments one, two and three, the otoconial mass was respectively detached in 2 out of 10 labyrinth preparations, none of the labyrinth preparations, and all of the labyrinth preparations.Conclusion:Vibration was the most effective stimulus for detaching the otoconia from the cupula in these experimental models of cupulolithiasis.
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Paranina, Galina N. "Northern Labyrinths – Gnomons and models of geographical Space." Procedia - Social and Behavioral Sciences 19 (2011): 593–601. http://dx.doi.org/10.1016/j.sbspro.2011.05.174.

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Shtengel, Kirill, and L. P. Chayes. "Vertex models and random labyrinths: phase diagrams for ice-type vertex models." Journal of Statistical Mechanics: Theory and Experiment 2005, no. 07 (July 27, 2005): P07006. http://dx.doi.org/10.1088/1742-5468/2005/07/p07006.

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Moore, J. Jeffrey. "Three-Dimensional CFD Rotordynamic Analysis of Gas Labyrinth Seals." Journal of Vibration and Acoustics 125, no. 4 (October 1, 2003): 427–33. http://dx.doi.org/10.1115/1.1615248.

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Labyrinth seals are utilized inside turbomachinery to provide noncontacting control of internal leakage. These seals can also play an important role in determining the rotordynamic stability of the machine. Traditional labyrinth seal models are based on bulk-flow assumptions where the fluid is assumed to behave as a rigid body affected by shear stress at the interfaces. To model the labyrinth seal cavity, a single, driven vortex is assumed and relationships for the shear stress and divergence angle of the through flow jet are developed. These models, while efficient to compute, typically show poor prediction for seals with small clearances, high running speed, and high pressure.* In an effort to improve the prediction of these components, this work utilizes three-dimensional computational fluid dynamics (CFD) to model the labyrinth seal flow path by solving the Reynolds Averaged Navier Stokes equations. Unlike bulk-flow techniques, CFD makes no fundamental assumptions on geometry, shear stress at the walls, as well as internal flow structure. The method allows modeling of any arbitrarily shaped domain including stepped and interlocking labyrinths with straight or angled teeth. When only leakage prediction is required, an axisymmetric model is created. To calculate rotordynamic forces, a full 3D, eccentric model is solved. The results demonstrate improved leakage and rotordynamic prediction over bulk-flow approaches compared to experimental measurements.
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Melo, Verônica G. M. L., Ana C. S. Araújo, Antonio P. Camargo, Leonardo L. Melo, José A. Frizzone, and Wagner W. A. Bombardelli. "Head Loss in Thin-Walled Drip Tapes with Continuous Labyrinth." Scientific World Journal 2019 (December 10, 2019): 1–11. http://dx.doi.org/10.1155/2019/8640893.

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Thin-walled drip tapes with continuous labyrinth have been used for irrigation of vegetables and other short-cycle crops, especially due to their low cost. The continuous labyrinths welded into the pipe inner wall affect the head loss along such emitting pipes. In addition, the flow cross section of thin-walled pipes may change due to the effects of the operating pressure, which also has consequences for the head loss. The objective of this work was to investigate experimentally the friction factor and the head loss on thin-walled drip tapes with continuous labyrinths operated under various pressures. Two models of commercial thin-walled drip tapes with continuous labyrinths were evaluated. Nonperforated samples were used to determine the head-loss equations. The equations were adjusted as a function of flow rate and pressure head at the pipe inlet. Alternatively, the diameter in the Darcy–Weisbach equation was adjusted as a function of the pressure head by a power-law model. The possibility of using a mean diameter in the Darcy–Weisbach equation was also analyzed. Experimental investigation indicated that the friction factor in the Darcy–Weisbach equation can be accurately described using a power-law model, like the Blasius equation, but characterized by a coefficient a=0.3442 for the Turbo Tape and a=0.3225 for the Silver Tape. The obtained values of a are larger than those generally used and available in the literature. The influence of the operating pressure on the pipe diameter can be neglected for the purpose of calculating the head loss. The two approaches, considering the variation of the diameter with the pressure head and considering an optimum average diameter for the calculation of head loss by the Darcy–Weisbach equation, produce similar results, allowing accurate prediction of head loss. Evaluating the proposed mathematical models, 95% of predictions presented relative errors of head loss smaller than 5%. For the Turbo Tape, the optimum diameter for the purpose of calculating the head loss is 16.01 mm, which is very close to the value indicated by its manufacturer (15.9 mm). For the Silver Drip, the optimum diameter is 15.71 mm, while the manufacturer gives a value of 16.22 mm, which produces considerable error in the calculation of head loss.
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Rhode, D. L., J. A. Demko, U. K. Traegner, G. L. Morrison, and S. R. Sobolik. "Prediction of Incompressible Flow in Labyrinth Seals." Journal of Fluids Engineering 108, no. 1 (March 1, 1986): 19–25. http://dx.doi.org/10.1115/1.3242535.

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A new approach was developed and tested for alleviating the substantial convergence difficulty which results from implementation of the QUICK differencing scheme into a TEACH-type computer code. It is relatively simple, and the resulting CPU time and number of numerical iterations required to obtain a solution compare favorably with a previously recommended method. This approach has been employed in developing a computer code for calculating the pressure drop for a specified incompressible flow leakage rate in a labyrinth seal. The numerical model is widely applicable and does not require an estimate of the kinetic energy carry-over coefficient for example, whose value is often uncertain. Good agreement with measurements is demonstrated for both straight-through and stepped labyrinths. These new detailed results are examined, and several suggestions are offered for the advancement of simple analytical leakage as well as rotordynamic stability models.
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Garrison, Thomas G., Dustin Richmond, Perry Naughton, Eric Lo, Sabrina Trinh, Zachary Barnes, Albert Lin, Curt Schurgers, Ryan Kastner, and Sarah E. Newman. "Tunnel Vision." Advances in Archaeological Practice 4, no. 2 (May 2016): 192–204. http://dx.doi.org/10.7183/2326-3768.4.2.192.

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AbstractArchaeological tunneling is a standard excavation strategy in Mesoamerica. The ancient Maya built new structures atop older ones that were no longer deemed usable, whether for logistical or ideological reasons. This means that as archaeologists excavate horizontal tunnels into ancient Maya structures, they are essentially moving back in time. As earlier constructions are encountered, these tunnels may deviate in many directions in order to document architectural remains. The resultant excavations often become intricate labyrinths, extending dozens of meters. Traditional forms of archaeological documentation, such as photographs, plan views, and profile drawings, are limited in their ability to convey the complexity of tunnel excavations. Terrestrial Lidar (light detection and ranging) instruments are able to generate precise 3D models of tunnel excavations. This article presents the results of a model created with a Faro™ Focus 3D 120 Scanner of tunneling excavations at the site of El Zotz, Guatemala. The lidar data document the excavations inside a large mortuary pyramid, including intricately decorated architecture from an Early Classic (A.D. 300–600) platform buried within the present form of the structure. Increased collaboration between archaeologists and scholars with technical expertise maximizes the effectiveness of 3D models, as does presenting digital results in tandem with traditional forms of documentation.
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Kalish, John M., Reidar Nydal, Kjell H. Nedreaas, George S. Burr, and Gro L. Eine. "A Time History of Pre- and Post-Bomb Radiocarbon in the Barents Sea Derived from Arcto-Norwegian Cod Otoliths." Radiocarbon 43, no. 2B (2001): 843–55. http://dx.doi.org/10.1017/s0033822200041515.

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Radiocarbon measured in seawater dissolved inorganic carbon (DIC) can be used to investigate ocean circulation, atmosphere/ocean carbon flux, and provide powerful constraints for the fine-tuning of general circulation models (GCMs). Time series of 14C in seawater are derived most frequently from annual bands of hermatypic corals. However, this proxy is unavailable in temperate and polar oceans. Fish otoliths, calcium carbonate auditory, and gravity receptors in the membranous labyrinths of teleost fishes, can act as proxies for 14C in most oceans and at most depths. Arcto-Norwegian cod otoliths are suited to this application due to the well-defined distribution of this species in the Barents Sea, the ability to determine ages of individual Arcto-Norwegian cod with a high level of accuracy, and the availability of archived otoliths collected for fisheries research over the past 60 years. Using measurements of 14C derived from Arcto-Norwegian cod otoliths, we present the first pre- and post-bomb time series (1919–1992) of 14C from polar seas and consider the significance of these data in relation to ocean circulation and atmosphere/ocean flux of 14C. The data provide evidence for a minor Suess effect of only 0.2‰ per year between 1919 and 1950. Bomb 14C was evident in the Barents Sea as early as 1957 and the highest 14C value was measured in an otolith core from a cod with a birth date of 1967. The otolith 14C data display key features common to records of 14C obtained from a Georges Bank mollusc and corals from the tropical and subtropical North Atlantic.
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Roushangar, Kiyoumars, Mohammad Taghi Alami, Jalal Shiri, and Mahdi Majedi Asl. "Determining discharge coefficient of labyrinth and arced labyrinth weirs using support vector machine." Hydrology Research 49, no. 3 (March 3, 2017): 924–38. http://dx.doi.org/10.2166/nh.2017.214.

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Abstract A labyrinth weir is a linear weir folded in plan-view which increases the crest length and the flow rate for a given channel width and an upstream flow depth. The present study aimed at determining discharge coefficients of labyrinth and arced labyrinth weirs using support vector machine (SVM)-based models. A total of 527 laboratory test data of four types of weirs, namely, Normal and Inverted orientation Labyrinth Weirs in flume (NLW, ILW) and Arced Labyrinth Weirs with and without nappe Breakers in reservoir (ALW, ALWB), were captured from the published literature and utilized to feed the SVM-based models. The obtained results revealed the capability of the SVM-based models in determining discharge coefficients. The results showed that the SVM-based model of arced labyrinth weir (ALW) produced the most accurate results when three dimensionless parameters, e.g. (HT/P) head water ratio, (α/θ) angle ratio and (Lc/W) magnification ratio, were introduced as input parameters (Root mean square error [RMSE]= 0.013 and R2 = 0.970 for the test stage). Nonetheless, sensitivity analysis showed that Froude number and head water ratio are the most influential parameters on discharge coefficients of the labyrinth and arced labyrinth weirs, respectively.
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Ahmadi, Zobeideh, Seyed Asadollah Mohseni Movahed, and Javad Mozaffari. "The effects of dentate crest and a row of consecutive orifices along and below the crest edge on labyrinth weir efficiency." Canadian Journal of Civil Engineering 46, no. 6 (June 2019): 552–55. http://dx.doi.org/10.1139/cjce-2018-0008.

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A labyrinth weir is one of the most effective ways of increasing weir discharge efficiency compared with a linear overflow structure. In this study, two proposed models of labyrinth weir, one with a dentate crest and another with a row of orifices along and below the crest edge were compared with a simple labyrinth weir, measuring their effects on the discharge coefficient. Experiments on nine labyrinth weir models were conducted in the hydraulic laboratory flume. These experiments indicated that creation of both dentate crest edge and row of consecutive orifices led to an increased discharge coefficient of between 11 to 25.3% and 31.6 to 52.9%, respectively, relative to simple labyrinth weir. By increasing the upstream head water, the discharge coefficient for the labyrinth weir model with dentate crest and the model with a row of consecutive orifices are closer together and eventually will converge.
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Dissertations / Theses on the topic "Labyrinths Models"

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Grepl, Tomáš. "Add-on instrukce pro síť AS-Interface." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220131.

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This master's thesis deal with design and creating of the instructions for industry bus AS-Interface. These instructions were implemented in the software ControlLogix5000 like add-on instructions. In the teoretical part there are presented the issues of industrial control, AS-Interface bus, add-on instruction and model of the labyrinth. The practical part of the master's thesis is focused to design of the add-on instruction and work with instruction and its characteristics followed by the description of the sample add-on instruction and the list of all implemented instructions. The final two chapters include visualization and laboratory exercise.
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Duncan, Robert Keith. "Finite-element analysis of inner ear hair bundles : a parameter study of bundle mechanics /." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-09292009-020226/.

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Choi, Dong Chun. "A novel isolation curtain to reduce turbine ingress heating and an advanced model for honeycomb labyrinth seals." Texas A&M University, 2005. http://hdl.handle.net/1969.1/3799.

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A combination of 3-D and 2-D computational fluid dynamics (CFD) modeling as well as experimental testing of the labyrinth seal with hexagonal honeycomb cells on the stator wall was performed. For the 3-D and 2-D CFD models, the hexagonal honeycomb structure was modeled using the concept of the baffle (zero-thickness wall) and the simplified 2-D fin, respectively. The 3-D model showed that even a small axial change of the tooth (or honeycomb wall) location, or a small circumferential change of the honeycomb wall location significantly affected the flow patterns and leakage characteristics especially for small tooth tip clearance. Also, the local details of the flow field were investigated. The seven basic procedural steps to develop a 2-D axisymmetric honeycomb labyrinth seal leakage model were shown. Clearly demonstrated for varying test conditions was the 2-D model capability to predict the 3-D honeycomb labyrinth flow that had been measured at different operating conditions from that used in developing the 2-D model. Specifically, the 2-D model showed very close agreement with measurements. In addition, the 2-D model greatly reduced the computer resource requirement needed to obtain a solution of the 3-D honeycomb labyrinth seal leakage. The novel and advanced strategy to reduce the turbine ingress heating, and thus the coolant requirement, by injecting a “coolant isolation curtain” was developed numerically using a 3-D CFD model. The coolant isolation curtain was applied under the nozzle guide vane platform for the forward cavity of a turbine stage. Specifically, the isolation curtain serves to isolate the hot mainstream gas from the turbine outer region. The effect of the geometry change, the outer cavity axial gap clearance, the circumferential location of the injection curtain slot and the injection fluid angle on the ingress heating was investigated. Adding the chamfer to the baseline design gave a similar or higher maximum temperature T* max than did the baseline design without chamfer, but implementation of the injection curtain slot reduced substantially T* max of the outer region. In addition, a more desirable uniform adiabatic wall temperature distribution along the outer rotor and stator surfaces was observed due to the presence of the isolation curtain.
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Patel, Nirmal Praful School of Medicine UNSW. "Olfactory progenitor cell transplantation into the mammalian inner ear." Awarded by:University of New South Wales. School of Medicine, 2006. http://handle.unsw.edu.au/1959.4/26180.

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A practical consideration in the development of cellular therapy technology for the inner ear is the development of an in vitro model for assessing the optimal conditions for successful application of cells. The first part of this thesis describes the adaptation of the cochleovestibular structure harvested from P1 mouse pups for analysis of factors critical for the optimal implantation of stem cells in the inner ear. Results of these studies establish that the c17.2 neural stem cell line can be introduced into the cochleovestibular structure in vitro. Using this model, c17.2 cells demonstrated survival predominantly within the vestibule and basal spiral ganglion regions. Furthermore, the addition of the ototoxin, cisplatin and the neurotrophin, Brain Derived Neurotrophic Growth Factor (BDNF) enhanced the survival and migration/dispersion of c17.2 cells within the cochleovestibular explant. The second part of this thesis examines the hypothesis that olfactory neurosphere (ONS) and progenitor cells harvested from the olfactory epithelium represent a viable source of graft material for potential therapeutic applications in the inner ear. Olfactory epithelium represents a unique source of pluripotent cells that may serve as either homografts or autografts. The feasibility of ONSs to survive and integrate into a mammalian cochlea in vivo was assessed. The ONSs were isolated as a crude fraction from the olfactory epithelium of P1 to P3 day old swiss webster mouse pups, ubiquitously expressing the Green Fluorescent Protein (GFP) marker. The ONSs were microinjected into the cochleae of adult CD1 male mice. Four weeks following their implantation, ONS cells expressing the GFP marker and stained by Nestin were identified in all areas of the cochlea and vestibule, including the spiral ganglion. Robust survival and growth of the implanted ONS and ONS derived cells in the cochlea also included the development of ???tumor-like??? clusters, a phenomenon not observed in control animals implanted with c17.2 neural stem cells. Collectively, the results of this thesis illustrate the potential of olfactory neurosphere and progenitor cells to survive in the inner ear and expose a potential harmful effect of their transplantation.
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Xi, Jinxiang. "Seal inlet disturbance boundary conditions for rotordynamic models and influence of some off-design conditions on labyrinth rotordynamic instability." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4971.

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Systematic parametric studies were performed to better understand seal-inlet rotordynamics. A CFD-perturbation model was employed to compute the seal-inlet flow disturbance quantities. Seal inlet disturbance boundary condition correlations were proposed from the computed seal-inlet quantities using the important parameters. It was found that the cosine component of the seal-inlet swirl velocity disturbance W1C has a substantial impact on the cross-coupled stiffness, and that the correlations for W1C and W1S should be used to replace the historical guess that seal inlet W1C = 0 and W1S = 0. Also, an extremely precise relationship was found between the swirl disturbance W1C and the seal-inlet swirl velocity (ωRsh − ¯W0). Thus, the number of experiments or computer runs needed to determine the effect of spin speed, shaft radius and/or inlet swirl velocity on the cross-coupled stiffness is greatly reduced by plotting the simplified relationship of the cross-coupled stiffness against the swirl slip velocity. The benefits of using the new seal-inlet boundary condition correlations were assessed by implementing them into a CFD-perturbation model. Consistently improved agreement with measurements was obtained for both liquid annular seals and gas labyrinth seals. Further, the well-established CFD-perturbation model with new boundary condition correlations was employed to investigate the rotordynamics of two off-design situations. The first case considered the influence of labyrinth seal teeth damage on the performance and the rotordynamic characteristics of impeller eye seals in centrifugal compressors. The second case considered the influence of rotor-axial-shifting on rotordynamic forces for high-low labyrinth seals in steam turbines during the start-up and shut-down process. The results should provide useful information for labyrinth seal design and fault diagnosis of stability problems in turbines and compressors.
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Chu, Kit-hang, and 朱傑亨. "Study of abnormal inner ear development in Waardenburg-Shah syndrome using a Sox10-GEP mutant mouse model." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hdl.handle.net/10722/206530.

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Sox10 is a high mobility group (HMG) domain transcription factor which is an important regulator for neural crest development. SOX10 mutations have been identified in Waardenburg-Shah syndrome type 4 (WS4) patients who suffer from sensorineural deafness. However, the mechanisms underlying the hearing defect of SOX10-mediated WS4 are unclear. The aim of this study is to elucidate the function of Sox10 during mouse inner ear development using a mutant mouse model, in order to reveal the underlying basis for SOX10 mutation associated sensorineural deafness in WS4 patients. The mammalian inner ear originates from the otic placode epithelium as well as neural crest cells (NCCs). To understand the role of Sox10 in inner development, I investigated the contribution of cranial NCCs to the cochleovestibular ganglion (CVG) by lineage tracing analysis, using Wnt1-cre;ZEG mice in which all NCCs were marked by GFP. Co-expression of GFP-positive cells with the glial marker BFABP suggested that glial cells in the CVG were derived from NCCs. Furthermore, Sox10-expressing NCCs were found to invade the CVG at 30-somite stage. These results suggest a role of Sox10 in regulating cranial NCCs contribution to CVG glia. In our laboratory we have generated a mouse mutant Sox10EGFP in which the Sox10 N-terminal domain was fused to the EGFP reporter. To investigate the function of Sox10 in NCCs invasion and gliogenesis of CVG, phenotypic analysis of Sox10NGFP mutant mouse were performed. EGFP expression in the CVG and inner ear epithelium of Sox10NGFP/+ embryos recapitulated the dynamic expression pattern of Sox10. Sox10NGFP/NGFP mutants displayed a reduced number of migrating NCCs and lacked NCCs or glia in their CVG. Moreover, loss of glial cell in the developing spiral ganglia of Sox10NGFP/NGFP mice led to disorganized fasciculation and degeneration of axonal filaments. These data suggest that Sox10 is required for maintaining the cranial NC stem cell pool, and is also essential for CVG gliogenesis and normal growth and innervation of spiral ganglion neurons. To study the function of Sox10 in regulating cochlear morphogenesis, morphological and histological analysis of mutant cochlear were performed. As illustrated by paint-filling analysis, Sox10NGFP/NGFP mice developed a shortened cochlear duct, reduced cochlear turning and enlarged endolymph lumen. Sensory hair cell patterning in the organ of Corti was normal in the Sox10 mutant as shown by immunohistochemistry analysis, suggesting that cochlear lumen enlargement was not due to disrupted planar cell polarity (PCP) pathway. To explore the molecular basis of Sox10-mediated cochlear morphogenic defect, expression of genes related to cochlear development were examined by qRT-PCR. Candidate genes included those involved in fluid homeostasis, which are known to affect the size of cochlear lumen. Up-regulated expression of Aquaporin 3, a water channel protein in the cochlear epithelium that facilitates water transport across the cell membrane, was observed in Sox10NGFP/NGFP cochlear. These results suggest that Sox10 may regulate cochlear morphogenesis by controlling endolymph homeostasis. In conclusion, Sox10 is required in multiple processes during inner ear development including NCC invasion, gliogenesis and cochlear morphogenesis, and their abnormal development can lead to sensorineural deafness in WS4 syndrome.
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Biochemistry
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Doctor of Philosophy
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Breuninger, Christian. "Zum Übertragungsverhalten des Mittelohrs und der Wirkung der Steigbügelbewegung auf den Hörnerv." Aachen Shaker, 2008. http://d-nb.info/990070336/04.

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Cherif, Sofiane. "An improved method for the estimation of firing rate dynamics using a Kaiser window /." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112387.

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The aim of this thesis is to develop a novel technique for the estimation of firing rate dynamics from single-unit recordings of neural pulse trains. This method applies an offline digital filtering technique to extract information transmitted by a neuron in teens of a rate code. While there is increasing evidence that the traditional rate coding cannot account for all the information transmitted by a cell, and that information may also be contained in the precise timing of spikes, the firing rate signal remains the benchmark by which the vast majority of electrophysiological studies relating neural activity to functional behaviour have been interpreted. Nevertheless, there does not seem to be an agreement on a single definition of a rate code let alone a consensus on an optimal estimation method. This study raises significant concerns about the validity of some of the most common methods in systems neuroscience, and proposes a simple yet more robust alternative. This latter is based on the convolution of the spike train with an optimally designed Kaiser window. Using computer-simulated as well as experimental data obtained from single-unit recordings of vestibular canal afferents, the proposed technique is shown to consistently outperform the current methods and even to permit robust estimations under time-varying conditions. These results suggest that estimates acquired with the conventional methods are biased and hence models of neural dynamics based on these latter may not be reliable.
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Oyágüez, Reyes Esther. "Laberinto, violencia y parodia : Análisis textual de Pólvora Negra de Montero Glez." Thesis, Linnéuniversitetet, Institutionen för språk och litteratur, SOL, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-16304.

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This essay examines how the image of the labyrinth appears in the novel Pólvora Negra (2008) by Montero Glez, a novel that we inscribe into the Spanish postmodern literature tradition.         The hypothesis of this essay is that the labyrinth works as a main theme or a macro theme for the novel since it recurs frequently and at the same time contains other topics, such as violence.         Our analysis shows, using a structural semiotic method, that the presence of the labyrinth occurs in four different ways in the text. The first is in the physical landscape since Madrid in the beginning of the 20th century, the space in which the novel is ambiented, is a labyrinthine town with small, dark, dirty and bad smelling streets. The second is in the structure of society, which is also labyrinthine since it represents an unjust and corrupt social order that is more obvious among the political leading class but that has an effect on all the segments of society. The third is that the physical and mental trayectories of the three main caracthers in the novel are labyrinthine, which is something that the reader can notice throughout the text. The fourth is that the novel itself has a labyrinthine narrative which means that the reader’s project also manifests itself as labyrinthine. The reader of Pólvora Negra has to deal with both the labyrinth in the text and the labyrinth of the text.         This essay analyzes the narrator’s voice as well as its function in the novel. The use of parody is abundant in the novel. Two kinds of parody are founded: the historical parody and the parody of the criminal novel.
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Ricard, Laurence. "Validation du modèle du labyrinthe en T chez le rat et application à l'étude des propriétés mnésiques de dérivés cholécystokininergiques." Paris 5, 1993. http://www.theses.fr/1993PA05P167.

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Books on the topic "Labyrinths Models"

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Hawkesworth, Walter. Leander: Labyrinthus. Hildesheim: G. Olms, 1987.

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Garcin, Christian. Labyrinthes et cie. [Lagrasse]: Verdier, 2003.

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Catherine, Powell, ed. Tokyo: Labyrinth city. London: Ellipsis, 1997.

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The Chinese labyrinth: Exploring China's model of development. Lanham, Md: Lexington Books, 2011.

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Farel, Alain. Le troisième labyrinthe: Architecture et complexité. Montreuil/Bois [France]: Editions de la Passion, 1991.

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Triandopolis, Eduardo. Im Labyrinth der Welt ohne den Ariadnefaden: Die verlorene Hoffnung. München: Hieronymus, 1996.

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Forest, Philippe. Textes et labyrinthes: James Joyce, Franz Kafka, Edwin Muir, Jorge Luis Borges, Michel Butor, Alain Robbe-Grillet. Mont-de-Marsan: InterUniversitaires, 1995.

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Bungaku to meikyū. Tōkyō: Chūsekisha, 2010.

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Ireland, Patrick. Patrick Ireland: Labyrinths, language, pyramids, and related acts. Madison, Wis: Elvehjem Museum of Art, University of Wisconsin-Madison, 1993.

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Brion, Marcel. Les labyrinthes du temps: Rencontres et choix d'un Européen. Paris: J. Corti, 1994.

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Book chapters on the topic "Labyrinths Models"

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Llano, Stephen M. "A Rhetorical Model of Debating." In Competing, cooperating, deciding: towards a model of deliberative debate, 43–54. Florence: Firenze University Press, 2021. http://dx.doi.org/10.36253/978-88-5518-329-1.05.

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A rhetorical model of the debate centered on the image of a labyrinth is more suitable than the metaphor of debate-as-game in describing the benefits of arguing in front of an audience. The labyrinth best expresses that proceeding by successive choices, coming and going, and sometimes retracing one's steps, typical of the debate activity. The basic thesis is that arguing is a continuous adaptation of one's speeches according to the audience that listens. In fact, in the labyrinth, what matters is not only arriving at the outcome - the exit or reaching the center of the structure - but the path you choose to get there is equally important. More than the definitive and winning argument, which rarely occurs in discussions, the labyrinth teaches us to recognise the plurality of approaches adopted when faced with an issue.
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Maschberger, Thomas. "A Stochastic Model of Accretion." In The Labyrinth of Star Formation, 345–49. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-03041-8_67.

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Haworth, Thomas J., Tim J. Harries, and David M. Acreman. "Testing Models of Triggered Star Formation: Theory and Observation." In The Labyrinth of Star Formation, 213–14. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-03041-8_40.

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Robitaille, Thomas P., and Barbara A. Whitney. "A New Set of Model Spectral Energy Distributions for Young Stellar Objects." In The Labyrinth of Star Formation, 157–60. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-03041-8_28.

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Reggiani, Maddalena, and Michael R. Meyer. "From the Companion Mass Ratio Distribution to the Planetary Mass Function: Using Multiple Systems to Constrain Models of Star and Planet Formation." In The Labyrinth of Star Formation, 25–29. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-03041-8_4.

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Cangioli, Filippo, Giuseppe Vannini, Paolo Pennacchi, Lorenzo Ciuchicchi, Leonardo Nettis, Steven Chatterton, and Andrea Vania. "Development and Validation of a Bulk-Flow Model for Staggered Labyrinth Seals." In Mechanisms and Machine Science, 471–90. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99262-4_34.

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Chapuis, A., M. Thomas, L. Deroo, C. Richit, and C. Touzet. "Piano Key Weirs on a lateral spillway: From an analytical preliminary design to a detailed design validated by a physical model." In Labyrinth and Piano Key Weirs III – PKW 2017, 205–12. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2017. http://dx.doi.org/10.1201/9781315169064-29.

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Dairien, A., F. Thouverez, L. Blanc, P. Héliès, and J. Dehouve. "Fluid-Structure Interaction in a Labyrinth Gas Seal Coupled to a Flexible Stator." In Topics in Modal Analysis & Testing, Volume 10, 1–9. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-54810-4_1.

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Solomon, Deborah. "To Wander “As It Were in a Labyrinthe”: Spenser's Garden Critiques on Reading Poetry." In The Poem and the Garden in Early Modern England, 105–72. London: Routledge, 2022. http://dx.doi.org/10.4324/9781003256748-4.

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Niu, Y. H., W. S. Lu, and D. D. Liu. "RFID-Enabled Management System Adoption and Use in Construction: Passing Through the Labyrinth with an Improved Technology Acceptance Model." In Proceedings of the 21st International Symposium on Advancement of Construction Management and Real Estate, 1251–58. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-6190-5_110.

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Conference papers on the topic "Labyrinths Models"

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Moore, J. Jeffrey. "Three-Dimensional CFD Rotordynamic Analysis of Gas Labyrinth Seals." In ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/vib-21394.

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Abstract Labyrinth seals are utilized inside turbomachinery to provide non-contacting control of internal leakage. These seals can also play an important role in determining the rotordynamic stability of the machine. Traditional labyrinth seal models are based on bulk-flow assumptions where the fluid is assumed to behave as a rigid body affected by shear stress at the interfaces. To model the labyrinth seal cavity, a single, driven vortex is assumed and relationships for the shear stress and divergence angle of the through flow jet are developed. These models, while efficient to compute, typically show poor prediction for seals with small clearances, high running speed, and high pressure (Childs, 1993). In an effort to improve the prediction of these components, this work utilizes three-dimensional computational fluid dynamics (CFD) to model the labyrinth seal flow path by solving the Reynolds Averaged Navier Stokes equations. Unlike bulk-flow techniques, CFD makes no fundamental assumptions on geometry, shear stress at the walls, as well as internal flow structure. The method allows modeling of any arbitrarily shaped domain including stepped and interlocking labyrinths with straight or angled teeth. When only leakage prediction is required, an axisymmetric model is created. To calculate rotordynamic forces, a full 3D, eccentric model is solved. The results demonstrate improved leakage and rotordynamic prediction over bulk-flow approaches compared to experimental measurements.
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Biester, Marc H. O., Florian Wiegmann, Yavuz Guendogdu, and Joerg R. Seume. "Time-Resolved Numerical Study of Axial Gap Effects on Labyrinth-Seal Leakage and Secondary Flow in a LP Turbine." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-95628.

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One of the most promising ways to improve the efficiency of modern turbomachinery is the reduction of secondary flow-structures and associated losses. A widely spread approach is the usage of shrouded airfoils in combination with labyrinth-seals. The disadvantage of this arrangement is a small but inevitable labyrinth-leakage flow that tends to increase the secondary-flow structures. The present work investigates how the axial gap of the blade rows and the corresponding shift of the labyrinth’s inlet and outlet influences leakage related effects on the flow-field and loss-generation. In order to capture the inter-blade and leakage interaction properly, time-resolved RANS computations of a 1 1/2 stage low pressure turbine have been performed. Besides accounting for labyrinth seals, fillets have been modeled. The axial gap is varied from 20% to 80% axial chord length. Clocking-effects induced by the axial gap variation are compensated. The leakage flow nearly retains the flow direction of the flow entering the blade row. In case of the largest axial gap, mixing causes the flow-angle of the leakage to tend towards that of the main-flow, thus reducing the incidence on the downstream blade row. Therefore, the turning of the low-momentum flow is increased compared to a small axial gap. This leads to a higher loading in the affected region and an increased passage vortex can be observed. By comparing the entropy generation of computations with and without labyrinth seals, the regions where leakage-related losses occur are identified and the relevant mechanisms are distinguished.
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Bouderlique, Re´mi, Franc¸ois Guibault, Andre´ Garon, and Thi Vu. "A Computational Model for Hydraulic Labyrinth Seals." In ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-31229.

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Every Francis turbine has a thin gap between rotating and non-rotating parts, which prevents contact between the two units. Although necessary, hydraulic seals create energetic losses: some fluid does not flow through the runner (leakage loss) and exerts a torque on the rotor (friction loss). Only analytical and empirical prediction methods of a seal efficiency had been developed before 1980. Numerical methods are now used to predict seals performance. However, most of the studies known to the authors deal with gas labyrinth seals and use the k–ε turbulence model. In hydraulic seals, since the viscous losses in the boundary layer influence the leakage loss, low Reynolds turbulence models appear more appropriate. Our study aims to implement an accurate model to predict losses in labyrinth seals using a low Reynolds model, and validate it using experimental results. The issues of the mesh and boundary conditions are addressed. The commercial code ANSYS CFX 12 is used.
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Corral, Roque, Michele Greco, and Luis Matabuena. "Non-Linear Flutter Analysis of Labyrinth Seals." In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-82142.

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Abstract A simple nonlinear model to describe labyrinth seal flutter has been developed to assess the aeromechanic stability of straight-through labyrinth seals subjected to large gap variations. The model solves the one-dimensional integral mass, momentum, and energy equations of the seal for a prescribed motion numerically until a periodic state is reached. The model accounts for the effect, previously neglected, of high clearance variations on the stability. The results show that when the vibration amplitudes are small, the work-per-cycle coincides with the prediction of the Corral and Vega model (2018, “Conceptual Flutter Analysis of Labyrinth Seals Using Analytical Models. Part I: Theoretical Background”, ASME J. Turbomach.140(10), pp. 121006) and Corral et al. (2021, “Higher-Order Conceptual Model for Seal Flutter”, ASME J. Turbomach. 143(7), pp.071006), but for large vibration amplitudes nonlinearities alter the stability limit. In realistic cases, when the discharge time of the seal is much longer than the vibration period, the nonlinear effects are significant and tend to increase the unstable range of operating conditions. Furthermore, seals supported either on the high-pressure or low-pressure sides, stable for small vibration amplitudes, can destabilise when the vibration amplitude increases. The linear stability, though close in many situations to the nonlinear threshold, is not conservative, and attention must be paid to nonlinear effects.
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Devi, Ravindra G., Satyanarayanan Seshadri, and Vittorio Michelassi. "Numerical Model for Condensing Steam Through Labyrinth Seal." In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-58736.

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Abstract This paper presents the flow physics of condensing steam flow across a straight through labyrinth seal from numerical simulations performed using ANSYS CFX. Homogeneous nucleation model and droplet growth model, which are critical in predicting condensation, are validated with good agreement against a well-known experimental data set from convergent-divergent nozzle. Validation data includes static pressure drop, condensation location, condensate mass fraction and Sauter mean radius. CFD study is performed on a five teeth labyrinth geometry to predict leakage flow rate, location of condensate accumulation and condensation rate. Impact of subcooled and condensed steam on leakage flow, pressure and temperature field are also discussed. For condensing steam, the condensate accumulation trend is identified. Some of the key findings and physical insights of interest to the designer are listed including: the effect of cooling on the leakage flow (with and without condensation) and the minimum seal wall temperature to avoid condensation based on subcooling needed for droplet formation (at location condition). Also investigated is whether steam condensation continues or if existing condensate evaporates in the downstream pockets, and the effect of heat release from condensation on number of droplets formed and the Sauter mean radius.
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Corral, Roque, Michele Greco, and Almudena Vega. "Higher-Order Conceptual Model for Labyrinth Seal Flutter." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-14387.

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Abstract A simple non-dimensional model to describe the flutter onset of two-fin straight labyrinth seals [1] is extended to account for non-isentropic flow perturbations. The isentropic relationship is replaced by the more general integral energy equation of the inter-fin cavity. A new expression for the Corral & Vega stability criterion is derived which is very consistent with the previous model in the whole design space of the seal but for torsion centers located in the high-pressure side close to the seal. The new model formally depends on more dimensionless parameters since the existing parameter grouping of the previous model does not hold anymore, but this dependency is weak in relative terms. The model blends the limit where the discharge time of the inter-fin cavity is much longer than the vibration period, and the flow is nearly isentropic, and the opposite limit, where the perturbations are isothermic, gracefully. A few numerical examples obtained using a three-dimensional linearized frequency domain solver are included to support the model and show that the trends are correct but the body of the numerical work will be presented in a separated article. The matching between the work-per-cycle obtained with the model and frequency domain solver is good. It is shown that some weird trends obtained using linearized unsteady simulations are qualitatively consistent with the current model but not with the previous one [1]. The largest differences between the new and the previous model are seen when the seal is supported at the high-pressure side.
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Wu, Tingcheng, and Luis San Andrés. "Gas Labyrinth Seals: Improved Prediction of Leakage in Gas Labyrinth Seals Using an Updated Kinetic Energy Carry-Over Coefficient." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-14167.

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Abstract Though simple and fast, bulk-flow models (BFMs) for gas labyrinth seals (LSs) often predict the mass flow inaccurately. The BFM models rely on classical Neumann’s equation model to characterize the flow through a labyrinth tooth. Presently, a CFD analysis quantifies the effects of tip clearance (Cr) and operating conditions on the prediction of LS mass flow, and then derives an updated kinetic energy carry-over coefficient (μ1i) to improve the accuracy of Neumann’s leakage equation. μ1i is a function of the seal tip clearance (Cr), the tooth pitch, and the total teeth number; but it does not depend on the seal supply or discharge pressures. The analysis selects a fourteen teeth on stator LS (Length/Diameter = L/D = 0.29) with clearance Cr = (1/733)D and operating at nominal supply (Pin) and discharge (Pout) pressures equal to 73 bar and 51 bar, respectively, and at a rotor speed of 12 krpm (surface speed = 138 m/s.). The CFD produces flow fields for LSs with a clearance varying from 80% to 200% of the nominal Cr, a gas supply pressure from 60 bar to 100 bar, and with various discharge pressures giving a pressure ratio (PR = Pout/Pin) ranging from 0.40 to 0.85. The numerous predictions deliver the mass flow as well as the bulk-flow velocities and cavity pressures within the seals. The kinetic energy carry-over coefficient (μ1i) increases with respect to the seal radial clearance (Cr). μ1i shows a parabolic correlation with PR; at first μ1i increases with a rise in PR from a low value; and then a further increase in PR leads to a decrease in μ1i. The coefficient μ1i is only sensitive to the pressure ratio and not to the magnitude of either the supply or discharge pressures. Lastly, for use with Neumann’s leakage model, the CFD predictions produce an updated μ1i, a function of the seal geometry and the PR condition. Integration of the new μ1i correlation into a BFM code improves its accuracy to predict LS mass flow rate, a 19% difference against test data reduces to within 6%. A TOS LS tested by Ertas et al. (2012) serves to further validate the accuracy of the modified leakage model.
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Wang, Tianhao, Zhigang Li, and Jun Li. "Rotordynamic Characteristics of the Straight-Through Labyrinth Seal Based On the Applicability Analysis of Leakage Models Using Bulk-Flow Method." In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-59568.

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Abstract Labyrinth seals are widely applied in the turbomachinery to control the leakage flow through the clearance between the stationary and rotating components. The fluid excitation induced by the labyrinth seal would deteriorate the stability of turbomachinery shaft. Developing an accurate and rapid prediction approach is crucial for the analysis of the fluid excitation rotordynamics of the labyrinth seal. The objective of this study is to analyze the applicability of leakage models using Bulk-Flow method and investigate the factors affecting the rotordynamic characteristics of the labyrinth seal. An elliptical orbit for rotor whirling was assumed in the one-control-volume Bulk-Flow model considering an isentropic process to predict the frequency-dependent rotordynamic coefficients of the labyrinth seal. The optimal leakage model was determined by comprehensively analyzing the applicability of 72 leakage models. Employing the optimal leakage model in the Bulk-Flow method, the effects of sealing clearance, pressure ratio, preswirl ratio and rotational speed on the rotordynamic characteristics of the labyrinth seal were investigated. The conclusions show that the Bulk-Flow method has an average prediction error of around 10% for the leakage flow rate, cross-coupled stiffness and direct damping when equipped with the optimal leakage model. Increasing preswirl ratio has a significantly destabilizing effect on the rotor stability, while the influence of increasing rotational speed is strongly related to preswirl direction. The effective damping of the labyrinth seal is sensitive to the inlet pressure, but insensitive to the outlet pressure and sealing clearance. The crossover frequency is almost impervious to the inlet pressure, outlet pressure and sealing clearance.
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Suryanarayanan, Saikishan, and Gerald L. Morrison. "Labyrinth Seal Discharge Coefficient for Rectangular Cavities." In ASME 2009 Fluids Engineering Division Summer Meeting. ASMEDC, 2009. http://dx.doi.org/10.1115/fedsm2009-78152.

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A labyrinth seal leakage prediction equation can be developed by considering the seal as a series of orifices and cavities. CFD simulations are used to investigate the discharge coefficient’s dependence of each tooth upon the seal geometry and flow conditions for multi-toothed, teeth on stator, straight through labyrinth seals with rectangular cavities. The discharge coefficient for the first tooth of the labyrinth seal was found to be a function of tooth width to clearance ratio and Reynolds number. It was found that the ratio of the discharge coefficients of a downstream tooth of the labyrinth seal to that of the inlet tooth is a function of the carry over coefficient. The carry over coefficient is a measure of the amount of kinetic energy entering a cavity that is dissipated by turbulence in the cavity. It was observed that the expansion factor (compressibility effect) is a function of tooth pressure ratio. The models developed in this paper for discharge coefficient and expansion factor coupled with the carry over coefficient model presented in our earlier work provide a leakage prediction algorithm that is validated against prior experiments.
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Corral, Roque, Almudena Vega, and Michele Greco. "Conceptual Flutter Analysis of Stepped Labyrinth Seals." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91621.

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Abstract A simple non-dimensional model to describe the flutter onset of two-fin straight labyrinth seals [1] is extended to stepped seals. The effect of the axial displacement of the seal is analyzed first in isolation. It is shown that this fundamental mode is always stable. In a second step, the combination of axial and torsion displacements is used to determine the damping of modes with arbitrary torsion centers. It is concluded that the classical Abbot’s criterion stating that seals supported in the low-pressure side of the seal are stable provided that natural frequency of the mode is greater than the acoustic frequency breaks down under certain conditions. An analytical expression for the non-dimensional work-per-cycle is derived and new non-dimensional parameters controlling the seal stability identified. It is finally concluded the stability of stepped seals can be assimilated to that of a straight through seal if the appropriate distance of the torsion center to the seal is chosen.
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