Relevant bibliographies by topics / Concentric Reducer

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Concentric Reducer'

Author: Grafiati
Published: 4 June 2021
Last updated: 4 February 2022

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Journal articles on the topic "Concentric Reducer"

1

Subaschandar, N. "Computational Study of Fluid Flow Inside a Concentric Reducer." MATEC Web of Conferences 54 (2016): 11001. http://dx.doi.org/10.1051/matecconf/20165411001.

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2

Sang, Z. F., and G. E. O. Widera. "Stress and Strength Analysis of Concentric Reducers Consisting of Plates." Journal of Pressure Vessel Technology 110, no. 2 (May 1, 1988): 217–24. http://dx.doi.org/10.1115/1.3265592.

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This paper presents a new kind of piping component—a concentric reducer consisting of plates. Authors performed experimental and elastic, elastic-plastic analyses on five test models having different structural parameters. The elastic stress distribution under hydraulic test pressure, the extension of the plastic region under higher than operating loads and the results of bursting tests are also reported on. Results indicate that under test pressure the maximum stress occurs at the inside of the junction area between the small end of the reducer and the small end tube. Yield and final burst also occurs at this area under higher than operating pressure. Based on the results of the analysis, it can be concluded that the reducer is safe and reliable.
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Singh, C. D., S. K. Dhua, M. Kumar, A. K. Jha, T. Mrinal, K. Sharma, R. R. Abhyuday, and Y. Kumar. "Metallurgical Investigation of a Prematurely Failed Concentric Reducer Tube Used in a Hot-Rolling Mill." Journal of Failure Analysis and Prevention 7, no. 4 (August 15, 2007): 292–301. http://dx.doi.org/10.1007/s11668-007-9048-y.

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Ulfah, Nurul, Rahman Hakim, and Michael Tri Adelitho. "Rancang Bangun Jig & Fixture Untuk Pipe Fitting Steel Concentric Reducer Pada Mesin Bevel Pipa." Jurnal Poli-Teknologi 19, no. 2 (November 5, 2020): 145–50. http://dx.doi.org/10.32722/pt.v19i2.2742.

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Pang, Seung-Ki, and Hye-Rin Ahn. "Evaluation of Flow Characteristics in Water Supply Pipes Shielding Electromagnetic Pulse of 100 dB with Concentric and Eccentric Reducers." Transactions of the Korea Society of Geothermal Energy Engineers 13, no. 1 (March 1, 2017): 1–6. http://dx.doi.org/10.17664/ksgee.2017.13.1.001.

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Deev, A. V., T. Rasheed, M. C. Welsh, M. M. K. Khan, and M. G. Rasul. "Measurement of instantaneous flow velocities in a concentric reducer using Particle Image Velocimetry: Study of scale deposition." Experimental Thermal and Fluid Science 33, no. 6 (September 2009): 1003–11. http://dx.doi.org/10.1016/j.expthermflusci.2009.05.001.

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Aghaei-Lasboo, Anahita, Katherine Inoyama, Adam S. Fogarty, Jonathan Kuo, Kimford J. Meador, Jessica J. Walter, Scheherazade T. Le, Kevin D. Graber, Babak Razavi, and Robert S. Fisher. "Tripolar concentric EEG electrodes reduce noise." Clinical Neurophysiology 131, no. 1 (January 2020): 193–98. http://dx.doi.org/10.1016/j.clinph.2019.10.022.

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8

Kay, Anthony D., and Anthony J. Blazevich. "Concentric muscle contractions before static stretching minimize, but do not remove, stretch-induced force deficits." Journal of Applied Physiology 108, no. 3 (March 2010): 637–45. http://dx.doi.org/10.1152/japplphysiol.01135.2009.

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The effects of concentric contractions and passive stretching on musculotendinous stiffness and muscle activity were studied in 18 healthy human volunteers. Passive and concentric plantar flexor joint moment data were recorded on an isokinetic dynamometer with simultaneous electromyogram (EMG) monitoring of the triceps surae, real-time motion analysis of the lower leg, and ultrasound imaging of the Achilles-medial gastrocnemius muscle-tendon junction. The subjects then performed six 8-s ramped maximal voluntary concentric contractions before repeating both the passive and concentric trials. Concentric moment was significantly reduced (6.6%; P < 0.01), which was accompanied by, and correlated with ( r = 0.60–0.94; P < 0.05), significant reductions in peak triceps surae EMG amplitude (10.2%; P < 0.01). Achilles tendon stiffness was significantly reduced (11.7%; P < 0.01), but no change in gastrocnemius medialis muscle operating length was detected. The subjects then performed three 60-s static plantar flexor stretches before being retested 2 and 30 min poststretch. A further reduction in concentric joint moment (5.8%; P < 0.01) was detected poststretch at 90% of range of motion, with no decrease in muscle activity or Achilles tendon stiffness, but a significant increase in muscle operating length and decrease in tendon length was apparent at this range of motion ( P < 0.05). Thirty minutes after stretching, muscle activity significantly recovered to pre-maximal voluntary concentric contractions levels, whereas concentric moment and Achilles tendon stiffness remained depressed. These data show that the performance of maximal concentric contractions can substantially reduce neuromuscular activity and muscle force, but this does not prevent a further stretch-induced loss in active plantar flexor joint moment. Importantly, the different temporal changes in EMG and concentric joint moment indicate that a muscle-based mechanism was likely responsible for the force losses poststretch.
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Lee, Dae-Young, Jongwoo Kim, Ji-Suk Kim, Changyeob Baek, Gunwoo Noh, Do-Nyun Kim, Keri Kim, Sungchul Kang, and Kyu-Jin Cho. "Anisotropic Patterning to Reduce Instability of Concentric-Tube Robots." IEEE Transactions on Robotics 31, no. 6 (December 2015): 1311–23. http://dx.doi.org/10.1109/tro.2015.2481283.

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10

Banks, R. E., and W. K. R. Musgrave. "The operation of concentric-tube distillation columns under reduced pressure." Journal of Applied Chemistry 6, no. 5 (May 4, 2007): 214–18. http://dx.doi.org/10.1002/jctb.5010060504.

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Dissertations / Theses on the topic "Concentric Reducer"

1

Tabassum, Rasheed, and tabassum rasheed@svt com au. "Scale growth study in a concentric reducer: Measurement of instantaneous velocity using Particle Image Velocimetry." Central Queensland University. School of Advance Technology and Processes, 2005. http://library-resources.cqu.edu.au./thesis/adt-QCQU/public/adt-QCQU20060720.095421.

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Gibbsite scale growth in pipe fittings is a major problem for an alumina refinery. A recent investigation into the scale growth mechanism at an alumina refinery found almost 60 % more scale growth in a reducer when compared with the connecting straight pipe sections for similar flow conditions. Scale growth occurs where liquor (supersaturated solutions) come in contact with solid surfaces and it is affected by the liquor flow velocity besides other physical and chemical parameters. The present work is dedicated to study the hydro-dynamical aspects of the mechanism of scale growth. In particular, the role of the phenomenon of turbulent bursting, stream wise and cross stream fluctuating velocity components (Ux and Uy) was investigated as the flow moves through the reducer. Particle Image Velocimetry (PIV) technique was used to get a full view of the reducer and the readings close-to-the-wall of the reducer at Reynolds number of 27,000 and 44,000 upstream which corresponds to Reynolds number of 41,500 and 66,000 downstream of the reducer respectively. The results showed an increase in cross stream and a decrease in magnitude of stream wise fluctuating velocity components, whereby we presume that the increased cross stream fluctuating velocity component increases the frequency of impacts of the scaling particles on the wall thus initiating excessive scale growth in the reducer when compared with the connecting straight pipe sections, for similar flow conditions.
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Books on the topic "Concentric Reducer"

1

Parker, Philip M. The 2007-2012 World Outlook for Replacement Parts for Concentric and Parallel Shaft Speed Reducers, Motor Reducers, and Gearmotor Products. ICON Group International, Inc., 2006.

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The 2006-2011 World Outlook for Replacement Parts for Concentric and Parallel Shaft Speed Reducers, Motor Reducers, and Gearmotor Products. Icon Group International, Inc., 2005.

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3

Zoccali, Carmine, Davide Bolignano, and Francesca Mallamaci. Left ventricular hypertrophy in chronic kidney disease. Edited by David J. Goldsmith. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780199592548.003.0107_update_001.

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Alterations in left ventricular (LV) mass and geometry and LV dysfunction increase in prevalence from stage 2 to stage 5 in CKD. Nuclear magnetic resonance is the most accurate and precise technique for measuring LV mass and function in patients with heart disease. Quantitative echocardiography is still the most frequently used means of evaluating abnormalities in LV mass and function in CKD. Anatomically, myocardial hypertrophy can be classified as concentric or eccentric. In concentric hypertrophy, the muscular component of the LV (LV wall) predominates over the cavity component (LV volume). Due to the higher thickness and myocardial fibrosis in patients with concentric LVH, ventricular compliance is reduced and the end-diastolic volume is small and insufficient to maintain cardiac output under varying physiological demands (diastolic dysfunction). In those with eccentric hypertrophy, tensile stress elongates myocardiocytes and increases LV end-diastolic volume. The LV walls are relatively thinner and with reduced ability to contract (systolic dysfunction). LVH prevalence increases stepwisely as renal function deteriorates and 70–80% of patients with kidney failure present with established LVH which is of the concentric type in the majority. Volume overload and severe anaemia are, on the other hand, the major drivers of eccentric LVH. Even though LVH may regress after renal transplantation, the prevalence of LVH after transplantation remains close to that found in dialysis patients and a functioning renal graft should not be seen as a guarantee of LVH regression. The vast majority of studies on cardiomyopathy in CKD are observational in nature and the number of controlled clinical trials in these patients is very small. Beta-blockers (carvedilol) and angiotensin receptors blockers improve LV performance and reduce mortality in kidney failure patients with LV dysfunction. Although current guidelines recommend implantable cardioverter-defibrillators in patients with ejection fraction less than 30%, mild to moderate symptoms of heart failure, and a life expectancy of more than 1 year, these devices are rarely offered to eligible CKD patients. Conversion to nocturnal dialysis and to frequent dialysis schedules produces a marked improvement in LVH in patients on dialysis. More frequent and/or longer dialysis are recommended in dialysis patients with asymptomatic or symptomatic LV disorders if the organizational and financial resources are available.
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The 2006-2011 World Outlook for Planetary, Cycloidal, Epicyclic, Chain, Cam, and Allied Concentric and Parallel Shaft Speed Reducers, Motor Reducers, and Gearmotor Products. Icon Group International, Inc., 2005.

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5

Parker, Philip M. The 2007-2012 World Outlook for Planetary, Cycloidal, Epicyclic, Chain, Cam, and Allied Concentric and Parallel Shaft Speed Reducers, Motor Reducers, and Gearmotor Products. ICON Group International, Inc., 2006.

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6

Paneni, Francesco, and Massimo Volpe. Co-morbidity (HFrEF and HFpEF): hypertension. Oxford University Press, 2019. http://dx.doi.org/10.1093/med/9780198784906.003.0415_update_001.

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Hypertensive heart disease is a major cause of heart failure (HF) and mortality. Hypertension precedes HF occurrence in 75% of cases, and carries a sixfold increase in HF risk as compared to non-hypertensive individuals. Most importantly, a minority of patients survive 5 years after the onset of hypertensive HF. In hypertensive patients, the heart may present different patterns of adaptive remodelling: concentric remodelling, concentric hypertrophy, and eccentric hypertrophy. Although most hypertensive patients are at high risk of developing concentric hypertrophy, a growing proportion of subjects display a concentric-to-eccentric progression eventually leading to left ventricular dilation and systolic dysfunction. Several factors including myocardial ischaemia, ethnicity, genetic background, history of diabetes, and blood pressure pattern may significantly influence the pathway from hypertension to left ventricular dilation. Patients with a concentric hypertrophy usually develop HF with preserved ejection fraction (HFpEF), whereas those with an eccentric (dilated) phenotype develop HF with reduced ejection fraction (HFrEF). Lowering blood pressure has a striking effect in reducing the risk of HF. Although available antihypertensive drugs are all successful in lowering blood pressure, angiotensin-converting enzyme inhibitors, angiotensin receptor blocker (ARBs), and diuretics are more effective than other drug classes in preventing HF. The combination of the neprilysin inhibitor sacubitril with the ARB valsartan (LCZ696) has recently been shown to be highly effective in reducing HF-related outcomes in hypertensive subjects. An individualized treatment scheme taking into account blood pressure levels, type of HF (HFpEF or HFrEF), and relevant co-morbidities (i.e. renal disease, diabetes) is currently the best approach to improve morbidity and mortality in hypertensive patients with HF.
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7

The 2006-2011 World Outlook for Planetary, Cycloidal, Epicyclic, Chain, Cam, and Allied Concentric and Parallel Shaft Speed Reducers and Motor Reducers with Center Distance of More Than 6 Inches. Icon Group International, Inc., 2005.

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8

The 2006-2011 World Outlook for Planetary, Cycloidal, Epicyclic, Chain, Cam, and Allied Concentric and Parallel Shaft Speed Reducers and Motor Reducers with Center Distance of 6 Inches or Less. Icon Group International, Inc., 2005.

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9

Parker, Philip M. The 2007-2012 World Outlook for Planetary, Cycloidal, Epicyclic, Chain, Cam, and Allied Concentric and Parallel Shaft Speed Reducers and Motor Reducers with Center Distance of More Than 6 Inches. ICON Group International, Inc., 2006.

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10

Parker, Philip M. The 2007-2012 World Outlook for Planetary, Cycloidal, Epicyclic, Chain, Cam, and Allied Concentric and Parallel Shaft Speed Reducers and Motor Reducers with Center Distance of 6 Inches or Less. ICON Group International, Inc., 2006.

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Book chapters on the topic "Concentric Reducer"

1

Paneni, Francesco, and Massimo Volpe. "Co-morbidity (HFrEF and HFpEF): hypertension." In The ESC Textbook of Cardiovascular Medicine, 1808–12. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198784906.003.0415.

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Hypertensive heart disease is a major cause of heart failure (HF) and mortality. Hypertension precedes HF occurrence in 75% of cases, and carries a sixfold increase in HF risk as compared to non-hypertensive individuals. Most importantly, a minority of patients survive 5 years after the onset of hypertensive HF. In hypertensive patients, the heart may present different patterns of adaptive remodelling: concentric remodelling, concentric hypertrophy, and eccentric hypertrophy. Although most hypertensive patients are at high risk of developing concentric hypertrophy, a growing proportion of subjects display a concentric-to-eccentric progression eventually leading to left ventricular dilation and systolic dysfunction. Several factors including myocardial ischaemia, ethnicity, genetic background, history of diabetes, and blood pressure pattern may significantly influence the pathway from hypertension to left ventricular dilation. Patients with a concentric hypertrophy usually develop HF with preserved ejection fraction (HFpEF), whereas those with an eccentric (dilated) phenotype develop HF with reduced ejection fraction (HFrEF). Lowering blood pressure has a striking effect in reducing the risk of HF. Although available antihypertensive drugs are all successful in lowering blood pressure, angiotensin-converting enzyme inhibitors, angiotensin receptor blocker (ARBs), and diuretics are more effective than other drug classes in preventing HF. The combination of the neprilysin inhibitor sacubitril with the ARB valsartan (LCZ696) has recently been shown to be highly effective in reducing HF-related outcomes in hypertensive subjects. An individualized treatment scheme taking into account blood pressure levels, type of HF (HFpEF or HFrEF), and relevant co-morbidities (i.e. renal disease, diabetes) is currently the best approach to improve morbidity and mortality in hypertensive patients with HF.
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2

Paneni, Francesco, and Massimo Volpe. "Co-morbidity (HFrEF and HFpEF): hypertension." In ESC CardioMed, 1808–12. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198784906.003.0415_update_002.

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Hypertensive heart disease is a major cause of heart failure (HF) and mortality. Hypertension precedes HF occurrence in 75% of cases, and carries a sixfold increase in HF risk as compared to non-hypertensive individuals. Most importantly, a minority of patients survive 5 years after the onset of hypertensive HF. In hypertensive patients, the heart may present different patterns of adaptive remodelling: concentric remodelling, concentric hypertrophy, and eccentric hypertrophy. Although most hypertensive patients are at high risk of developing concentric hypertrophy, a growing proportion of subjects display a concentric-to-eccentric progression eventually leading to left ventricular dilation and systolic dysfunction. Several factors including myocardial ischaemia, ethnicity, genetic background, history of diabetes, and blood pressure pattern may significantly influence the pathway from hypertension to left ventricular dilation. Patients with a concentric hypertrophy usually develop HF with preserved ejection fraction (HFpEF), whereas those with an eccentric (dilated) phenotype develop HF with reduced ejection fraction (HFrEF). Lowering blood pressure has a striking effect in reducing the risk of HF. Although available antihypertensive drugs are all successful in lowering blood pressure, angiotensin-converting enzyme inhibitors, angiotensin receptor blocker (ARBs), and diuretics are more effective than other drug classes in preventing HF. The combination of the neprilysin inhibitor sacubitril with the ARB valsartan (LCZ696) has recently been shown to be highly effective in reducing HF-related outcomes in hypertensive subjects. An individualized treatment scheme taking into account blood pressure levels, type of HF (HFpEF or HFrEF), and relevant co-morbidities (i.e. renal disease, diabetes) is currently the best approach to improve morbidity and mortality in hypertensive patients with HF.
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3

Marwick, Thomas H. "Chronic heart failure diagnosis: echocardiography." In ESC CardioMed, 1768–73. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198784906.003.0407.

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Imaging is helpful for the evaluation of myocardial structure and function, valvular disease, and haemodynamics in heart failure (HF). The assessment of ejection fraction is probably the most important step, as distinction of preserved, reduced, and mid-range ejection fraction has implications for management. In enlarged ventricles, quantification of mitral regurgitation and assessment of left ventricular (LV) shape are important as markers of HF severity. However, it should be remembered that haemodynamic evaluation and the assessment of right ventricular function are of value, independent of ejection fraction. The evaluation of diastolic dysfunction is based on estimation of LV filling pressure and assessment of severity of LV diastolic dysfunction, on the basis of left atrial volume, diastolic stage, and estimation of LV filling pressure (E/eʹ). Diastolic assessment is of value in patients with HF with preserved ejection fraction. LV responses to stress can identify an ischaemic aetiology, as well as left or right ventricular contractile reserve, a prognostic marker in both ischaemic and non-ischaemic cardiomyopathy. In patients with risk factors for HF, the evaluation of myocardial deformation and classification of LV morphology on the basis of relative wall thickness and LV mass, into normal, concentric remodelling, concentric hypertrophy, and eccentric hypertrophy has prognostic value. Cardiac imaging is indispensable in the management of HF, and echocardiography is the most widely used test for this purpose. However, no single test satisfies all imaging requirements in HF.
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4

Alexander, Ian F. "A Taxonomy of Stakeholders." In Issues and Trends in Technology and Human Interaction, 25–71. IGI Global, 2007. http://dx.doi.org/10.4018/978-1-59904-268-8.ch002.

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Systems engineers have often paid too little attention to the nature of the so-called “users” of products under development. These are better called Stakeholders, as many roles are involved, and few of those are in direct contact with the developed products. A simple and robust conceptual framework for classifying development stakeholders – a taxonomy – is proposed. The taxonomy is product-centric, with concentric ‘Circles’ denoting broad categories of stakeholder. Within these, generic ‘Slots’ describe typical classes of stakeholder; these are subdivided into ‘Roles’ which are expected to vary at least in name with the domain. Examples are given, and a popular template is reanalysed using the framework. The taxonomy has immediate value in identifying and validating stakeholder roles in requirements elicitation. This helps to ensure that key viewpoints on requirements are not missed. That in turn reduces the risk of instability and failure during development.
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Alexander, Ian F. "A Taxonomy of Stakeholders." In End-User Computing, 317–50. IGI Global, 2008. http://dx.doi.org/10.4018/978-1-59904-945-8.ch026.

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Systems engineers have often paid too little attention to the nature of the so-called “users” of products under development. These are better called Stakeholders, as many roles are involved, and few of those are in direct contact with the developed products. A simple and robust conceptual framework for classifying development stakeholders – a taxonomy – is proposed. The taxonomy is product-centric, with concentric ‘Circles’ denoting broad categories of stakeholder. Within these, generic ‘Slots’ describe typical classes of stakeholder; these are subdivided into ‘Roles’ which are expected to vary at least in name with the domain. Examples are given, and a popular template is reanalysed using the framework. The taxonomy has immediate value in identifying and validating stakeholder roles in requirements elicitation. This helps to ensure that key viewpoints on requirements are not missed. That in turn reduces the risk of instability and failure during development.
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Guerrero Moreno, Salvador, Martín Aubert Hernández Calzada, and Carla Carolina Pérez Hernández. "Estimación de costos ocultos en una pequeña empresa del sector restaurantero." In Tendencias en la investigación universitaria. Una visión desde Latinoamérica. Volumen XII, 201–18. Fondo Editorial Universitario Servando Garcés de la Universidad Politécnica Territorial de Falcón Alonso Gamero / Alianza de Investigadores Internacionales S.A.S., 2020. http://dx.doi.org/10.47212/tendencias2020vol.xii.13.

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El presente estudio surge con el objetivo de identificar los disfuncionamientos existentes en la empresa objeto, mediante un diagnóstico basado en el Modelo Socioeconómico para proponer estrategias de mejoras que ayuden a reducir los costos ocultos estimados. Este se desarrolla mediante la metodología de intervencióninvestigación, bajo el paradigma de que la innovación organizacional permite a las empresas hacer frente a las oportunidades y amenazas del exterior, solventando los disfuncionamientos internos. Se mantiene un enfoque cualimétrico sustentado en herramientas como la observación, las entrevistas semiestructuradas y el análisis documental para obtener datos de la empresa y conocer los fenómenos que presenta mediante una interacción científica con el ambiente, atendiendo una aproximación socio-cognoscitiva. El modelo busca equilibrar los componentes sociales y económicos de la empresa para la consecución de resultados y el aprovechamiento de su potencial, es decir, que intenta resolver de origen las diferencias entre lo operado y lo esperado (disfuncionamientos), reduciendo su impacto en las finanzas, a través de un ambiente laboral sano. Aunque el desarrollo total del modelo comprende cuatro fases, la intervención sólo atiende las primeras dos: el diagnóstico y el proyecto socioeconómico. En la primera fase, se generó el inventario de disfuncionamientos con casi 500 frases testimonios que se evaluaron en términos financieros mediante la estimación de sus costos ocultos anuales, cuyo monto total asciende a $1 234 559.28, es decir, casi 1.5 veces la masa salarial. Cabe mencionar que la mayor parte se concentra en el área productiva y se relaciona con la Implementación de la estrategia. Con la información obtenida, en la segunda etapa se propuso un Plan de Acciones Estratégicas Internas y Externas, dividido en ocho ejes estratégicos, de esta manera, se le brinda a la entidad una herramienta que exponga precisamente los puntos de oportunidad.
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Conference papers on the topic "Concentric Reducer"

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Yu, C. C., C. T. Wu, and T. P. Chang. "A Direct Method on the Analysis of Steady State Residual Strains in a Steel Joint Subjected to Cyclic Loads." In ASME 2003 Pressure Vessels and Piping Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/pvp2003-2113.

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The thick plate element of Mindlin type combined with the plane stress element is adopted in the direct analysis method. The numerical process is pretty efficient with respect to the speed of the calculation of final steady state residual quantities resulted in by cyclic loads. Two pipes joined together with a concentric reducer are employed as an example. The steady state residual stresses and strains after pipes experience cyclic anti-symmetric deflections, simulating the seismic loads, are illustrated. The diameter, the length of the pipes, and properties of material are the parameters evaluated in the present study. Results indicate that shorter pipe has higher shear effect at the fixed end. The ratio of pipe diameter to pipe length does not significantly differ the residual profile while the existence of a concentric reducer disturbs the distribution of the residual stresses and residual plastic strains dramatically.
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Li, Yuchuan, Chao Dong, Xin Shao, Siqi Han, and Tao Wang. "Discussion and Improvement of the Rectification Capability of NEL Rectifier under the Concentric Reducer Based on FLUENT Simulation." In 2021 IEEE International Conference on Mechatronics and Automation (ICMA). IEEE, 2021. http://dx.doi.org/10.1109/icma52036.2021.9512758.

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Popescu, Jeni A., Valeriu A. Vilag, Romulus Petcu, Ion Vataman, and Valentin Silivestru. "Numerical Simulation to Determine Ejection Device Geometry for Turbo-Shaft Driven Water Pump." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50968.

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Turbo-engines with known performances reaching the end of their useful flying life can become useful assets in the execution of industrial projects. One such project reported in this paper is to install a high capacity complex device which will clear out the water in cases of floods. The partnership created in order to accomplish the task includes specialists in energetic, turbo-machinery, amelioration, hydraulic and action logistics fields and is aiming to acquire knowledge, results and experience and to transfer the information to economic and social environment. The TV2-117A turbo-shaft is the main component of the power group representing the energy source of the installation. It is connected to a reducer gear-box and a high capacity water pump. Considering the purpose of the installation to be realised, a device destined to handle natural calamities effects, the solution must fulfil several very important conditions: mobility, power and reliability. Being known the fact that moving elements have lower reliability conducts to the idea of an oil cooling system without mechanical or electrical driven fans. This is possible through using the ejection effect in a system based on the exhausted hot gases from the turbo-engine. The ejection device is a tubular structure using three concentric tubes on the outlet. The central one absorbs the hot gases and drives the cool air from the surrounding environment through the other two to accomplish both the oil and turbo-engine box cooling. The numerical analysis, using a CFD code, is still in progress and the paper presents intermediate results. The CFD conditions were imposed by the turbo-engine experimental data obtained in previous tests and the known working conditions established for the device to be created. The preliminary results helped to eliminate many flow problems caused by geometric dimensions and to establish the necessary adjustments in order to obtain the expected mass flow and speed values for the cooling devices. The adjustments on the geometry consisted in modifying the lengths, the bending and the diameters of the tubes. The final and most suitable geometry is still to be determined using the CFD code.
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Teertstra, Peter M., M. Michael Yovanovich, and J. Richard Culham. "Natural Convection Measurements for a Concentric Spherical Enclosure." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-32974.

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An experimental test program is described for the measurement of natural convection for an isothermal, heated sphere centrally located in an isothermal, cooled spherical enclosure. A transient test method is used in a reduced pressure environment to provide data for a wide range of Rayleigh number, from the limiting case of laminar boundary layer convection to the diffusive limit. Tests are performed using a fixed outer diameter for four different inner sphere diameters, resulting in diameter ratios in the range 1.5 ≤ do/di ≤ 4.8. The data are in excellent agreement with the exact solution for the conductive limit and are shown to be bounded by a model for the isolated, isothermal sphere.
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Chen, Sun-yi, Jin Chen, Zhengdong Wang, and Chen Wang. "Elastic Stresses and Limit Bending Moments of Concentric and Eccentric Reducers Subjected to Bending Moments." In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28119.

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In order to assess the safety of concentric reducers and eccentric reducers, the meridian stress and circumferential stress of the reducers subjected to in-plane bending moments are calculated based on the membrane theory. Solutions of limit bending moments are derived by using the approach with the equivalent stress and engineering coefficient. The solutions for both reducers are identical, as the formulas are composed of a base term multiplied by a bending moment coefficient. The limit bending moments are dominated by the small end of the reducers. The value of limit bending moment of the reducers is 14.6% more than that of a thin wall reducing elbow with same diameter and thickness when corresponding bending coefficient λ>3.0. But comparison with a straight pipe which has the same diameter and thickness as the small end of the reducers, the limit bending moment of the reducers is 11.1% lower and the constant in the formula for the reducers is 3.6 instead of 4.0 for straight pipe. It could be dangerous to determine the limit bending moment of concentric reducers and eccentric reducers directly from the formula of limit bending moment for a thin wall pipe.
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6

Radford, Steven Ralph, Mark Alan Jenkins, and Tracy Li. "Novel Concentric Expandable Stabilizer Results in Increased Penetration Rates and Drilling Efficiency With Reduced Vibration." In SPE/IADC Drilling Conference and Exhibition. Society of Petroleum Engineers, 2009. http://dx.doi.org/10.2118/119534-ms.

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7

Rodgers, C. "Affordable Smaller Turbofans." In ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68042.

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Smaller smarter un-manned air vehicles (UAV’s) and missiles are being proposed and developed to function in a variety of roles previously performed by larger manned aircraft and limited range missiles. The endurance and stealth demanded of such advanced vehicles requires small turbofan engines possessing relatively higher power density combined with increased thermal efficiency. It is shown that these two major performance related criteria are indirectly related to improved affordability for a specific turbofan design configuration. Changing the design configuration by implementing lower component count and flowpath simplification however is an alternate trade-off route to improved affordability, albeit at a slight performance decrement. As an example the classic two spool (2SC) turbofan with concentric shafting for the inner spool is the engine of choice for extended range applications, but can present shaft dynamic and bearing lubrication mechanical design concerns as size is reduced and core rotational speeds approach and exceed 100Krpm. Preliminary design features of two alternate non concentric drive small turbofan flowpath candidates are presented, neither of which can match the full performance capability of the classic two spool concentric drive turbofan, yet they potentially offer several affordability virtues, inasmuch as lower component count, reduced cost, higher reliability, oil less lubrication, and electric driven accessories.
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Makeyev, O., Xiang Liu, K. Koka, S. M. Kay, and W. G. Besio. "Transcranial focal stimulation via concentric ring electrodes reduced power of pentylenetetrazole-induced seizure activity in rat electroencephalogram." In 2011 33rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 2011. http://dx.doi.org/10.1109/iembs.2011.6091864.

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9

Okumus, Fuat, Aydin Turgut, and Erol Sancaktar. "Influence of Coating Layer to Reduce Thermal Stresses in Cylindrically Formed Metal Matrix Composites." In ASME 2000 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/detc2000/rsafp-14483.

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Abstract In this study, the use of coating layers is investigated to reduce thermal stresses in the metal matrix composites which have a mismatch in coefficients of thermal expansions in fiber and matrix components. The thermoelastic solutions are obtained based on a three-cylinder model. It is shown that the effectiveness of the layer can be defined by the product of its coefficient of thermal expansion and thickness. Consequently, a compensating layer with a sufficiently high coefficient of thermal expansion can reduce the thermal stresses in the metal matrix. The study is based on a concentric three cylinder model isolating individual steel fibers surrounded with a coating layer and an aluminum matrix layer. Only monotonic cooling is studied.
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Rahman, Aziz, Fabio Ernesto Rodriguez Corredor, Majid Bizhani, and Ergun Kuru. "Near Wall Turbulence Characteristics of a Drag Reducing Polymer Fluid Flow in Concentric Annulus Using CFD." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-65268.

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A CFD simulation was conducted to analyze the near wall turbulence characteristics of a drag reducing (DR) polymer fluid (0.12% V/V) flow through concentric annulus. The continuity and momentum equations were solved by using a commercial CFD package (CFX 14) with the Shear-Stress-Transport (SST) model option. The simulation results were compared to the experimental data obtained by using high resolution Particle Image Velocimetry (PIV) analyses of drag reducing polymer fluid flow in a horizontal concentric annulus. A fully developed turbulent flow of water through a horizontal flow loop (ID = 9.5 cm) with concentric annular geometry (inner to outer pipe radius ratio = 0.4) was used for comparison purpose. The flow rates ranged from 3.92 to 5.95 kg/s. Drag reducing PHPA solutions behaved as a power law fluid with the rheological model (μ = Kγn−1) for the shear rate of 1/s to 600/s. Bulk and near wall velocity profile obtained from simulation showed good agreements with the experimental data. Drag reducing polymer reduce the Reynolds stresses level due to weaker and fewer turbulent eddies formation near the wall. Results of the simulation study also showed that if the flow rates of power law fluid increased from 3.92 to 5.95 kg/s, the drag reduction in the annuli is increased from 10% to 20% compared to water case indicating the strong damping to turbulent kinetic energy in the flow. The CFD analyses using SST model is computationally inexpensive and, therefore, can be conveniently used for investigating the flow characteristics of drag reducing polymer fluids in concentric annulus.
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Reports on the topic "Concentric Reducer"

1

Freiría, Heber, Alejandro Nin Pratt, and Gonzalo Muñoz. Productividad y eficiencia en la producción ganadera pastoril en América Latina: Los casos de Bolivia y Colombia. Inter-American Development Bank, March 2021. http://dx.doi.org/10.18235/0003150.

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El estudio examina el desempeño de la producción ganadera en Bolivia y Colombia. Se trata de dos ganaderías con diferente trayectoria, madurez tecnológica, y desempeño productivo, y que tienen en común la existencia de “frontera agrícola”, es decir, cambios de uso del suelo que permiten incorporar tierras de pastoreo a la ganadería, a partir de bosques. En el caso de Bolivia, el estudio se limitó a la región oriental, compuesta por los departamentos de Beni y Santa Cruz, que concentra la mayor parte del inventario ganadero del país. Beni, el departamento tradicionalmente ganadero, muestra estancamiento en el período, en lo que respecta al inventario ganadero y la productividad. No han existido inversiones ni cambio técnico importantes en materia de alimentación y manejo del ganado. En Santa Cruz se ha producido un incremento importante de la producción en la primera mitad del período, con aumentos de productividad basados en el cambio técnico. Este cambio técnico se asocia a la implantación de pasturas, a partir de cambios en el uso del suelo. El crecimiento observado en Santa Cruz, en la primera mitad del período (hasta 2012) se detiene a partir de ese año, y la productividad de los factores decrece, dando como resultado un aumento de productividad casi nulo en el total del período analizado. El cambio técnico operado, basado en un modelo de cambio de uso del suelo con siembra de pastos, en competencia por la tierra con soja y otros cultivos, mostró su potencial de generar crecimiento, pero no fue capaz de sostenerlo. La ganadería colombiana muestra un importante incremento de producción en el período analizado. Puesto que los factores de producción (básicamente tierra e inventario ganadero), se incrementan en menor proporción, se verifica un considerable incremento en la productividad de los factores. Existe heterogeneidad en el desempeño entre rubros y regiones. La ganadería de leche es muy importante en Colombia, y predomina en regiones de trópico alto, relativamente maduras en tecnología. Al analizar la evolución de la productividad de los factores, sin embargo, la tasa de crecimiento es mayor en las regiones en que predomina la ganadería de carne. Incluso se verifica cierta sustitución entre rubros, con avance de la producción de carne en todas las regiones. El crecimiento se asocia a mejoras en nutrición del ganado, por siembra de pastos, y en menor medida suministro de suplementos. El diferente comportamiento de los rubros se refleja en su diferente capacidad de competir ante la producción importada, en la medida que la protección se reduce en el marco de los acuerdos comerciales suscritos por el país. La producción ganadera pastoril tiene a su vez implicancias ambientales Los análisis realizados en este estudio, muestran que una variable determinante de la intensidad de emisiones es la productividad de los factores. Debido a esto, la ganadería colombiana presenta menores intensidades de emisión, y con reducción a tasas mayores que las del oriente boliviano. Otro aspecto decisivo en el balance de GEI está dado por los cambios en uso del suelo asociados a la ganadería. Si la producción ganadera que reemplaza bosques no lo hace con alta productividad, el balance resultante afectará en mayor medida el desempeño ambiental de la ganadería de los países.
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