Log in

Relevant bibliographies by topics / Pumping chamber

Contents

Journal articles
Dissertations / Theses
Books
Book chapters
Conference papers
Reports

Academic literature on the topic 'Pumping chamber'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Pumping chamber.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Pumping chamber"

1

Chung, Tien Tung, Chih Kang Lu, and Yi Ting Tu. "Design, Manufacturing and Pump-down Curve Simulation of High Vacuum Systems." Applied Mechanics and Materials 220-223 (November 2012): 575–79. http://dx.doi.org/10.4028/www.scientific.net/amm.220-223.575.

Full text

Abstract:

This paper presents a vacuum system design for extreme ultraviolet lithography (EUV) and studies the prediction of pump-down curves for vacuum chambers. Related basic theories include gas laws, conductance for several kinds of flow regimes, equivalent length for pipes, outgassing, diffusion, and permeation etc. The simulation program consists of a MFC module and a MATLAB module. The MFC module is used to input necessary parameters, including start and target pressure for pumping, volume and inner surface area of vacuum chambers, configuration of pumping lines, performance of vacuum pumps, and gas loads. The MATLAB module deals with the pump-down curve calculation based on related theories. The governing equation of the conservation of mass in a pumped vacuum chamber is derived from extended Temkin isotherm. The pump-down curve of vacuum chamber is predicted by four steps, including calculation of equivalent length for pipes, conductance of pipes, and effective pumping speed of pumps, and pump-down time. An empty vacuum chamber is used to test the developed program. The pump-down curve reaches 6.5E-8 torr with 42 hours pump-down time in experiment measurement, and the simulated curve reaches 5.79E-8 torr at the same time point. The developed program can predict pump-down curve with a good accuracy in the range from low vacuum pressure to high vacuum pressure.

APA, Harvard, Vancouver, ISO, and other styles

2

Danilatos, Gerasimos D. "Reverse Flow Pressure Limiting Aperture." Microscopy and Microanalysis 6, no. 1 (January 2000): 21–30. http://dx.doi.org/10.1017/s1431927600000052.

Full text

Abstract:

The reverse flow pressure limiting aperture is a device that creates and sustains a substantial gas pressure difference between two chambers connected via an aperture. The aperture is surrounded by an annular orifice leading to a third chamber. The third chamber is maintained at a relatively high pressure that forces gas to flow through the annular aperture into the first of said two chambers. The ensuing gas flow develops into a supersonic annular gas jet, the core of which is coaxial with the central aperture. A pumping action is created at the core of the jet and any gas molecules leaking through the aperture from the second chamber are entrained and forced into the first chamber, thus creating a substantial pressure difference between the first and second chamber.

APA, Harvard, Vancouver, ISO, and other styles

3

Danilatos, Gerasimos D. "Reverse Flow Pressure Limiting Aperture." Microscopy and Microanalysis 6, no. 1 (January 2000): 21–30. http://dx.doi.org/10.1007/s100059910002.

Full text

Abstract:

Abstract The reverse flow pressure limiting aperture is a device that creates and sustains a substantial gas pressure difference between two chambers connected via an aperture. The aperture is surrounded by an annular orifice leading to a third chamber. The third chamber is maintained at a relatively high pressure that forces gas to flow through the annular aperture into the first of said two chambers. The ensuing gas flow develops into a supersonic annular gas jet, the core of which is coaxial with the central aperture. A pumping action is created at the core of the jet and any gas molecules leaking through the aperture from the second chamber are entrained and forced into the first chamber, thus creating a substantial pressure difference between the first and second chamber.

APA, Harvard, Vancouver, ISO, and other styles

4

Wang, S. S., X. Y. Huang, and C. Yang. "Valveless micropump with acoustically featured pumping chamber." Microfluidics and Nanofluidics 8, no. 4 (November 21, 2009): 549–55. http://dx.doi.org/10.1007/s10404-009-0533-3.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Marks, L. D., M. Kubozoe, M. Tomita, M. Ukiana, T. Furutsu, and T. Matsui. "Design and initial performance of a UHV-HREM." Proceedings, annual meeting, Electron Microscopy Society of America 46 (1988): 658–59. http://dx.doi.org/10.1017/s0424820100105357.

Full text

Abstract:

We report here on the basic design and the initial performance of a fully bakeable UHV-HREM. The instrument, see Figure 1,is based upon a conventional H-9000 electron microscope with the natural differential pumping of the column separating the standard gun and photographic chambers from the UHV specimen chamber. The addition of small ion pumps at the condenser aperture, the selected area aperture and between the two projector lenses (see Figure 2) (which attain operational pressures of ∼2 X 10-8, ∼2 X 10-8 and ∼2 X 10-7 Torr respectively) assist this differential pumping. To achieve full UHV performance the specimen region is bakeable to 200°C using a combination of tape and band heaters and quartz-halogen lamps. Specimens for HREM analysis can be pretreated in the transfer chamber which is shown in Figure 3. The specimens, held in a detachable side entry cartridge, can be moved both back and forward and rotated by 360° to face ports onto which equipment for LEED, ion beam, X-ray, evaporation and dye laser treatment of surfaces will be mounted; the transfer chamber acts as a conventional multi-port surface science chamber.

APA, Harvard, Vancouver, ISO, and other styles

6

NAKAMURA, Yasuo, Katsuaki NAGATOMO, Kazuo SOMEYA, and Hisao KITAYAMA. "Vacuum pumping system of 13meter diameter space chamber." SHINKU 33, no. 9 (1990): 738–46. http://dx.doi.org/10.3131/jvsj.33.738.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Lee, Young Kwan, Jin Hyoung Lee, Sung Kun Lee, Sang Hwan Lee, Youn Jea Kim, and Hun Mo Kim. "Nano Manufacturing Using Fountain Pen Nano-Lithography with Active Membrane Pumping." Key Engineering Materials 326-328 (December 2006): 425–28. http://dx.doi.org/10.4028/www.scientific.net/kem.326-328.425.

Full text

Abstract:

In this paper, nano manufacturing using the FPN (Fountain Pen Nano-Lithography) with active membrane pumping is investigated. This FPN has integrated pumping chamber, micro channel, and high capacity reservoir for continuous ink feed. The most important aspect in this probe provided the control of fluid injection using active membrane pumping in chamber. The flow rates in channel by capillary force are theoretically analyzed with two different working fluids, DPD (diphenyldichlorosilane) and water, including the cantilever deflection and the control of mass flow rates by the deflection of membrane. The theoretical results are compared with numerical ones that calculated by commercial code, FLUENT.

APA, Harvard, Vancouver, ISO, and other styles

8

Kaufmann, R., H. Reul, and G. Rau. "Electromechanical Artificial Heart with a New Gear Type and Angled Pump Chambers." International Journal of Artificial Organs 15, no. 8 (August 1992): 481–87. http://dx.doi.org/10.1177/039139889201500807.

Full text

Abstract:

The intrathoracic anatomical situation after explantation of the natural heart defines the maximum available space for the design of the housing as well as of the inlet-and outlet connectors of a fully implantable electromechanical artificial heart. Based on computer-assisted anatomical studies, a total artificial heart housing is designed which facilitates an oblique orientation of the pumping chambers for a better fluidmechanical and anatomical arrangement of the in- and outlet connectors. The pumping chamber geometry is based on modifications of an existing cardiac assist-system. Subsequently a mechanical gear which conforms to this anatomically adapted housing is developed.

APA, Harvard, Vancouver, ISO, and other styles

9

Yanto, Restu Andri, Anggi Putra Anugrah, Tutik Sriani, and Gunawan Setia Prihandana. "Portable Desalination Chamber Utilizing Water Permeable Polyethersulfone (PES) Membrane." Applied Mechanics and Materials 842 (June 2016): 457–60. http://dx.doi.org/10.4028/www.scientific.net/amm.842.457.

Full text

Abstract:

This paper presents design and fabrication of portable desalination chamber utilizing water permeable polyethersulfone (PES) membrane. The chamber has four stages of desalination process. Each stage has a membrane clamped by filter plate to desalinate sea water and an outlet to qualify the desalinated water from each stage. The chamber works without electrical power, hence desalination process can be carried out in remote areas where electricity source is difficult to find. The water stream is used to test the pumping system of the chamber to pump the water from the water container. The test shows that the pumping system of the chamber is working properly in delivering water to each stage of the chamber without any leakage. The membrane used in each chamber is a modified PES membrane which has high water permeability. Water permeability of the membrane will guarantee that the salt water will permeate easily through the membrane porous during desalination process, hence results in producing fresh water at the final outlet.

APA, Harvard, Vancouver, ISO, and other styles

10

Brazhnik, O. I., and A. A. Rudenko. "Pilot test results of GP-200/11x500-m stage chamber pump." Mining Industry (Gornay Promishlennost), no. 6/2020 (December 29, 2020): 53–55. http://dx.doi.org/10.30686/1609-9192-2020-6-53-55.

Full text

Abstract:

The article reviews and analyses issues that include optimisation of pumping equipment for efficient drainage of saline water in conditions of underground mines. It describes approaches to design improvement of pumping equipment and shows the economic effect of its implementation based on the results of pilot tests.

APA, Harvard, Vancouver, ISO, and other styles

More sources

Dissertations / Theses on the topic "Pumping chamber"

1

Ravi, Vinay. "Effect of nonlinear chamber compliance and pumping areas on the dynamic stiffness and chamber pressure of a hydraulic body mount." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1532032639331273.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Sezgin, Kubilay. "Pumping Chamber Design In Diode-pumped Solid-state Lasers For Maximum System Efficiency And Minimum Optical Distortion." Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615397/index.pdf.

Full text

Abstract:

The beam quality and the system efficiency of a diode-pumped solid-state laser source are directly related to the thermal profile inside the laser crystal. The thermal profile in a laser crystal should be made uniform in order to reduce the negative effects of the thermal lens. However, the absorbed pump profile that forms a uniform thermal profile inside the gain medium may adversely affect the system efficiency. In this thesis, a computational and empirical method was developed for designing pumping chambers that results in a suitable thermal profile inside the gain medium, and thus desired laser beam quality was achieved while keeping the system efficiency at an acceptable level. Accomplishment of this thesis work will lead to the design of pumping chambers and resonators in high power laser systems operating at even higher thermal loads.

APA, Harvard, Vancouver, ISO, and other styles

3

Solomon, Brad K. "Methods for Identifying Acoustic Emissions From the Front Face of a Small Piezoelectric Blower." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3542.

Full text

Abstract:

This thesis focuses on identifying acoustic noise generating components in piezoelectric blowers through transverse velocity measurements and the development of a numerical fluid model. Piezoelectric ceramics have proven useful for many industries and areas of research involving: high precision actuators, noise control, ultrasonic devices, and many other areas. As of late, a unique adaptation of piezoelectric ceramics is surfacing in the area of pumping and cooling. Air pumps that use these ceramics replace the traditional electric motor, resulting in lower power consumption, less moving parts, constant pressure gradients, lower overall weight, and a low profile. The current drawback of this application is the acoustic radiation produced by the blowers. Since these blowers are new to market, little research or development has been done to characterize the noise emissions. This thesis studies the acoustic emissions from the front face of a Murata piezoelectric blower. Jet noise and structural vibrations are two acoustic sources of interest that are studied in this research. A Direct Numerical Simulation (DNS) of the fluid flow through a Murata blower is developed to better identify noise generating mechanisms. The model solutions predict trends in sound pressure levels (SPL) of the jet noise and volumetric flow rates. Both the SPL and flow rate are shown to be functions of critical geometrical dimensions within the flow path of a Murata blower. Important dimensional components are identified as well as non-influential ones. Design guidelines are given to reduce noise emission from the front side of a blower and increase the volumetric flow rate. The results of this research have a direct impact on the piezoelectric blower industry and future blower designs.

APA, Harvard, Vancouver, ISO, and other styles

4

Ding-CongGong and 龔鼎琮. "A Computational and Experimental Study of Phase Difference Effects on the Flow Rate of Peristaltic Micropumps with Pumping Chambers in Series and Parallel Configurations." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/32681527565361989005.

Full text

Abstract:

博士
國立成功大學
航空太空工程學系碩博士班
100
This dissertation studies the phase difference effect on the flow rate of peristaltic micropump using numerical and experimental methods. Commercial software (CFD-ACE+) is validated first and employed in numerical simulations. To focus on the phase relationship of peristaltic micropumps, all geometric parameters of the pump are fixed for a baseline design and the diaphragm motion is assumed as a sinusoidal waveform with a fixed frequency of 1 Hz. The phase difference between neighboring chambers is varied from 30° to 120° in 10° increments. The pump configurations include the basic 3-chamber configuration and the configurations with up to 8 chambers in series or in parallel arrangements. The computational results indicate that the maximum flow rate Qmax increases with increasing number of chambers (n) for both series and parallel configurations. However, the maximum phase difference for the maximum pump flow decreases with increasing number of chambers (n) in series pumps, but increases with increasing number of chambers (n) in parallel pumps. The diaphragm oscillation amplitude also has a significant impact on the pumping flow rate. Experiments are performed in an attempt to verify the computational findings. The pump diaphragm is fabricated using PDMS with iron particle contents, and permanent magnets are employed to actuate the diaphragm into movement. The phase relation between diaphragm motions are controlled by a set of rotary cams specially designed and fabricated for the experiments. Near Rectangular waveform is used in the actuation of diaphragm movement. Results show that despite of the difference between computations and experiments, the basic trends of increasing Qmax and decreasing with increasing number of chambers (n) are verified for peristaltic micropumps in series configurations, while the trends of increasing Qmax and are also in good agreement with computational results for peristaltic micropumps in parallel configurations.

APA, Harvard, Vancouver, ISO, and other styles

Books on the topic "Pumping chamber"

1

A large high vacuum, high pumping speed space simulation chamber for electric propulsion. [Washington, DC: National Aeronautics and Space Administration, 1993.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Pumping chamber"

1

Rogovyi, Andrii, Sergey Khovanskyy, Irina Grechka, and Jan Pitel. "The Wall Erosion in a Vortex Chamber Supercharger Due to Pumping Abrasive Mediums." In Lecture Notes in Mechanical Engineering, 682–91. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-22365-6_68.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Chen, Song, Zhonghua Zhang, Junwu Kan, Jianping Li, and Jianming Wen. "Design, Characterisation and Prospect of Piezoelectric Microfluidic Technology." In Piezoelectric Actuators - Principles, Design, Experiments and Applications [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.98559.

Full text

Abstract:

Fluidic driving device plays an important role in the delivery and distribution of minute amount of the liquid in the micro-fluidic system. Due to the unique advantages of simple structure, short response time, and low power consumption, piezoelectric actuation was employed to implement the microfluidic transportation. A piezoelectrically driven microfluidic device, piezoelectric pump, was developed and widely applied in many fields in last three decades. As a kind of displacement pump, piezoelectric pumps is able to realize accurate transportation of the liquid because of per stroke of output fluid is equal to the volumetric change of pumping chamber. And the output flow rate and pressure is easily to be controlled through adjusting the driving voltage or frequency. In this chapter, the design, structure, working principle and the characterisation of piezoelectric pumps with single chamber and multiple chambers are introduced.

APA, Harvard, Vancouver, ISO, and other styles

3

DAYTON, B. B. "Relations Between Size of Vacuum Chamber, Outgassing Rate, and Required Pumping Speed." In Vacuum Technology Transactions, 101–19. Elsevier, 2013. http://dx.doi.org/10.1016/b978-1-4831-9852-1.50028-1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Krishnan, Kannan M. "Scanning Electron Microscopy." In Principles of Materials Characterization and Metrology, 693–744. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198830252.003.0010.

Full text

Abstract:

A scanning electron microscope (SEM) focuses an electron beam to a sharp probe, with its diameter, which depends on the acceleration voltage and the aberration coefficients of the probe-forming lens, determining SEM resolution. This electron beam is scanned over the specimen and signals arising from a variety of beam-specimen interactions are recorded to form images using different detectors positioned in the specimen chamber. Secondary electrons, detected with the Everton-Thornley detector, reveal the topography and electrical properties; back-scattered electrons provide information about the average atomic number and local crystallography of the specimen. Ferromagnetic materials alter the trajectory of secondary (Type I) and back-scattered (Type II) electrons to provide magnetic contrast. The magnetic polarization of the secondary electrons can also be analyzed directly (SEMPA) to image domains. The electron beam also excites characteristic X-rays for chemical microanalysis. Luminescent specimens produce light (Cathodoluminescence); these photons provide information on the electronic structure, particularly the defect states, of the specimen. Environmental SEMs, with differential pumping, image the specimen in a gaseous environment and/or under hydration for biological materials. A SEM combined with a focused ion beam (FIB) column is used for nano-fabrication, including preparation of electron-transparent TEM specimens.

APA, Harvard, Vancouver, ISO, and other styles

5

Kovács, Sándor J. "The heart as a pump: governing principles." In ESC CardioMed, edited by Guido Grassi, 111–15. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198784906.003.0021.

Full text

Abstract:

The pumping attributes of the heart remain active topics of investigation and mastery of how the heart functions as a pump is part of the fund of knowledge of physiologists and cardiologists. The advent of high-resolution, real-time imaging (computed tomography, magnetic resonance imaging cardiac catheterization, two- and three-dimensional echocardiography) has continued to advance our understanding of how the four-chambered heart (left heart, right heart) works as it fills and as it empties. The insights that have evolved emanate from a conceptual framework based on motion (kinematics) of selected phases and portions of the four-chambered heart and the contents of the pericardial sac. Concepts include pressure pumping, volume pumping, constant-volume pumping, the relationship between atrial and ventricular function and atrial and ventricular indexes, the role of the heart as a suction pump, laws that govern isovolumic relaxation, and the relationship of intraventricular fluid mechanics to diastolic function and wall motion. Accordingly, by asking such questions as ‘What is the ejection fraction of the pericardial sack, and why does it have the numerical value it has?’ or ‘Why does the left atrium fill in two phases—one in systole and one in diastole?’ or ‘How is atrial conduit volume related to diastolic wall motion?’ one can gain new insights into pumping function. This chapter presents a simple, useful, yet powerful conceptual framework that can be used descriptively or mathematically to addresses these and other clinically important themes.

APA, Harvard, Vancouver, ISO, and other styles

6

Kovács, Sándor J. "The heart as a pump: governing principles." In ESC CardioMed, edited by Guido Grassi, 111–15. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198784906.003.0021_update_001.

Full text

Abstract:

The pumping attributes of the heart remain active topics of investigation and mastery of how the heart functions as a pump is part of the fund of knowledge of physiologists and cardiologists. The advent of high-resolution, real-time imaging (computed tomography, magnetic resonance imaging cardiac catheterization, two- and three-dimensional echocardiography) has continued to advance our understanding of how the four-chambered heart (left heart, right heart) works as it fills and as it empties. The insights that have evolved emanate from a conceptual framework based on motion (kinematics) of selected phases and portions of the four-chambered heart and the contents of the pericardial sac. Concepts include pressure pumping, volume pumping, constant-volume pumping, the relationship between atrial and ventricular function and atrial and ventricular indexes, the role of the heart as a suction pump, laws that govern isovolumic relaxation, and the relationship of intraventricular fluid mechanics to diastolic function and wall motion. Accordingly, by asking such questions as ‘What is the ejection fraction of the pericardial sack, and why does it have the numerical value it has?’ or ‘Why does the left atrium fill in two phases—one in systole and one in diastole?’ or ‘How is atrial conduit volume related to diastolic wall motion?’ one can gain new insights into pumping function. This chapter presents a simple, useful, yet powerful conceptual framework that can be used descriptively or mathematically to addresses these and other clinically important themes.

APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Pumping chamber"

1

Voronin, V. I., A. A. Lemyakin, and S. O. Popova. "The device chamber pumping-out of TWT with part's separation." In 2010 International Conference on Actual Problems of Electron Devices Engineering (APEDE 2010). IEEE, 2010. http://dx.doi.org/10.1109/apede.2010.5624063.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Soudarev, A. V., Yu I. Zakharov, E. D. Vinogradov, and M. N. Gutnik. "Environmental Upgrading of GTN-16 Gas-Pumping Unit Combustion Chamber." In ASME 1997 Turbo Asia Conference. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-aa-138.

Full text

Abstract:

The results of research into development of engineering approaches to environmental update of the GTN-16 16 MW gas-pumping unit combustor are presented. The built-in “disc” combustor of the GTN-16 is noted for having a small length and very low hydraulic resistances. The multi-burner low-NOx combustor design was developed in a test rig. The “lean” fuel/air premix combustion was adopted as the basis for the design. The proposed environmental update of the GTN-16 combustor does not bring about any changes in the most costly material-intensive and labour-consuming components of the combustor, viz. casing, frame, liners. No changes were also made in the automatic control system. It is noteworthy that a similar approach is appropriate for the “Turbomotorny Zavod” (Ekaterinburg, Russia) GTN-25 type 25 MW unit.

APA, Harvard, Vancouver, ISO, and other styles

3

Wasson, J. W., S. F. Jones, and B. D. Elgert. "A Joint Venture Evaluation of Closed Chamber Testing On Pumping Oilwells." In Annual Technical Meeting. Petroleum Society of Canada, 1992. http://dx.doi.org/10.2118/92-23.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Su, Yi-Jr, Liang-Jen Huang, Hsin-Wei Chen, Bo-Yi Liao, Chia-Feng Chang, Lee-Jene Lai, and Shih-Hung Chang. "A multifunctional beamline chamber featuring diagnostic devices, differential pumping, and laser alignment for endstation optics." In PROCEEDINGS OF THE 13TH INTERNATIONAL CONFERENCE ON SYNCHROTRON RADIATION INSTRUMENTATION – SRI2018. Author(s), 2019. http://dx.doi.org/10.1063/1.5084682.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Zhou, Ning, Yuanhao Wu, Wenbin Han, and Shaowu Pan. "An extended CFD model to predict the pumping curve in low pressure plasma etch chamber." In PROCEEDINGS OF THE 29TH INTERNATIONAL SYMPOSIUM ON RAREFIED GAS DYNAMICS. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4902752.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Nakashima, Celso Y., Silvio Oliveira, and Elisio F. Caetano. "Thermo-Hydraulic Model of a Twin-Screw Multiphase Pump." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60139.

Full text

Abstract:

The twin-screw multiphase pump has been studied as an alternative equipment to substitute the conventional system (fluid separation, liquid pumping and gas compression) in petroleum boosting. By “pumping” gas and liquid together, the multiphase pump could reduce production costs, particularly in deepwater activity. This paper presents a thermo-hydraulic model of a twin-screw multiphase pump developed to determine important parameters such as: volumetric efficiency, absorbed power, discharge conditions, heat transfer and pressure and temperature profiles. The continuous movement from suction to the discharge of pump chambers is divided in small discretive steps. This division allows the calculation of energy and mass balances for each screw chamber. At each step, it is possible to calculate mass and energy that enters and leaves one chamber. With this balance, pressure and temperature for the next step can be calculated. Differently from previous model, it considers not only water-air but also hydrocarbon mixtures (including petroleum heavy fractions) as working fluids. Besides, inclusion of screw rotation influence over peripheral backflow is not neglected as in previous models.

APA, Harvard, Vancouver, ISO, and other styles

7

Jung, Jung-Yeul, and Ho-Young Kwak. "Novel Fabrication and Testing of a Bubble-Powered Micropump." In ASME 3rd International Conference on Microchannels and Minichannels. ASMEDC, 2005. http://dx.doi.org/10.1115/icmm2005-75015.

Full text

Abstract:

A bubble-powered micropump was fabricated and tested in this study. The micropump consists of a pair of nozzle-diffuser flow controller and a pumping chamber. The two-parallel micro line heaters were fabricated to be embedded in the silicon dioxide layer above a silicon wafer which serves as a base plate for the micropump. The pumping chamber, the pair of nozzle-diffuser unit and microchannels including the liquid inlet and outlet port were fabricated by etching through another silicon wafer. A glass wafer having two holes of inlet and outlet ports of liquid serve as upper plate of the pump. The sequential photographs of bubble nucleation, growth and collapse were visualized by CCD camera. Clearly liquid flow through the nozzle during the period of bubble growth and slight back flow of liquid at the initial period collapsing can be seen. The mass flow rate was found to be dependent on the duty ratio and the operation frequency. The mass flow rate decreases as the duty ratio increases in the micropump with either circular or square pumping chamber.

APA, Harvard, Vancouver, ISO, and other styles

8

Zeng, Pingying, Kang Wang, Ryan Falkenstein-Smith, Jeongmin Ahn, and Paul D. Ronney. "Power Generation From Thermal Transpiration Based Pumping Devices." In ASME 2014 12th International Conference on Fuel Cell Science, Engineering and Technology collocated with the ASME 2014 8th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fuelcell2014-6375.

Full text

Abstract:

This study examines the successful development of a combustion-driven thermal transpiration-based combustor and a self-sustaining gas pump system having no moving parts and using readily storable hydrocarbon fuel. A stacked configuration was then integrated into the combustor creating a self-sustaining power generation system. In recent years, power generation devices employing hydrocarbon fuels rather than electrochemical storage as energy feedstock have been studied extensively due to the much higher energy densities of hydrocarbon fuels than the best available batteries. While many devices have been proposed including internal combustion engines and gas turbines, they all require the use of air to obtain a higher energy density so that only one reactant (fuel) need be carried. Thermal transpiration was accomplished by meeting two essential conditions: (1) gas flow in the transitional or molecular regime using glass microfiber filters as transpiration membranes and (2) a temperature gradient through the membrane using catalytic combustion downstream of the membrane. A cubic combustor was designed to house the thermal transpiration membrane and develop into a self-sustaining gas pump system. Fuel/Air would feed through an inlet into a mixing chamber that would flow into the thermal guard containing the thermal transpiration membrane. The thermal guard was developed from a high thermal conductivity stainless steel made into a cubic formation by using a 3D printing process. This configuration allowed both fuel and air to be transpired through the membrane meaning it was not possible for any reactant flow to occur as a result of the fuel supply pressure and only the membrane could draw reactants into the device. In addition to pumping, a single-chamber solid-oxide fuel cell (SC-SOFC) was incorporated into combustion driven thermal transpiration pumps to convert chemical or thermal energy into electrical energy for a self-contained portable power generation system. Experiments showed that transpiration pumps with larger porosity and larger overall size exhibited better performance, though membrane pore size had little effect. These results were quantitatively consistent with theoretical predictions. By exploiting the temperature and fuel/oxygen concentrations within the transpiration pump, the SOFC achieved a maximum power density of 40 mW/cm2. Despite being far lower than necessary for a power source to be competitive with batteries, this preliminary study signifies an on-going positive efficiency that has potential for improvement through optimizing SOFC technology.

APA, Harvard, Vancouver, ISO, and other styles

9

Flouros, Michael. "Oil Pumping in High Speed and High Loaded Ball Bearings." In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-53406.

Full text

Abstract:

Trends in aircraft engine design cause increased mechanical stress requirements for rolling bearings. Consequently high amounts of heat are rejected which results in high oil scavenge temperatures. The direction of oil flow in the bearing can considerably affect the heat transported by the oil. An RB199 turbofan bearing and its associated chamber were modified to carry out the survey. The test bearing was a 124mm PCD ball bearing. The bearing has a split inner-ring employing under-race lubrication by two individual jets. The total oil flow could be devided to any ratio through the jets. This had an impact on the oil scavenge temperatures and the scavenge flows on both sides of the bearing. Significant reduction in the ‘heat to oil’ was achieved when oil was fed at certain proportions (ratio). This work is part of the European Research programme Brite Euram ATOS (Advanced Transmission and Oil Systems).

APA, Harvard, Vancouver, ISO, and other styles

10

Danilishin, A. M., Y. V. Kozhukhov, S. V. Kartashov, A. A. Lebedev, K. G. Malev, and Y. R. Mironov. "Design optimization opportunity of the end stage output plenum chamber of the centrifugal compressor for gas pumping unit." In OIL AND GAS ENGINEERING (OGE-2018). Author(s), 2018. http://dx.doi.org/10.1063/1.5051905.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Pumping chamber"

1

Novokhatski, A. DAMPING THE HIGH ORDER MODES IN THE PUMPING CHAMBER OF THE PEP-II LOW ENERGY RING. Office of Scientific and Technical Information (OSTI), June 2004. http://dx.doi.org/10.2172/827320.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!