Relevant bibliographies by topics / Residence time distribution

Academic literature on the topic 'Residence time distribution'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 March 2023

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

Select a source type:

Contents

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Residence time distribution.'

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 "Residence time distribution"

1

Landfeld, A., R. Žitný, M. Houška, K. Kýhos, and P. Novotná. "Residence time distribution during egg yolk pasteurisation." Czech Journal of Food Sciences 20, No. 5 (November 19, 2011): 193–201. http://dx.doi.org/10.17221/3531-cjfs.

Full text
Abstract:
This work describes the determination of the average residence times during egg yolk – and whole liquid eggs pasteurisation in an industrial pasteurisation equipment (plate pasteuriser + tube holder). For the detection of the impulse the conductivity method was used. Conductivity was then monitored using the bridge method. In the system, the total of 3 probes were placed. To mark the particles of the flowing product, salted yolk with the content of salt of 1.3 or 1.8% was used. In addition, rheological properties of pasteurised yolk were determined at the temperatures of 5, 25, 45, and 65°C. Based on the geometry of the channels in the individual sections of the pasteurisation equipment, the character of the flow was estimated using the Re criterion and was found to be laminar in all parts of the system. The work includes the comparison of the average residence times obtained by (a) the method of volumes, (b) the analysis of the conductivity response, (c) the estimate made by using the TUPLEX software, and (d) the estimate of the peaks of the conductivity response.  
APA, Harvard, Vancouver, ISO, and other styles
2

Iordache, Octavian, and Sergiu Corbu. "Random residence time distribution." Chemical Engineering Science 41, no. 8 (1986): 2099–102. http://dx.doi.org/10.1016/0009-2509(86)87127-5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Werner, Timothy M., and Robert H. Kadlec. "Wetland residence time distribution modeling." Ecological Engineering 15, no. 1-2 (June 2000): 77–90. http://dx.doi.org/10.1016/s0925-8574(99)00036-1.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Rodrigues, Alírio E. "Residence time distribution (RTD) revisited." Chemical Engineering Science 230 (February 2021): 116188. http://dx.doi.org/10.1016/j.ces.2020.116188.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Li, Mingheng. "Residence time distribution in RO channel." Desalination 506 (June 2021): 115000. http://dx.doi.org/10.1016/j.desal.2021.115000.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Martin, A. D. "Interpretation of residence time distribution data." Chemical Engineering Science 55, no. 23 (December 2000): 5907–17. http://dx.doi.org/10.1016/s0009-2509(00)00108-1.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Hill, S. "Residence time distribution in continuous crystallisers." Journal of Applied Chemistry 20, no. 10 (May 4, 2007): 300–304. http://dx.doi.org/10.1002/jctb.5010201001.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Jager, T., P. Santbulte, and D. J. van Zuilichem. "Residence time distribution in kneading extruders." Journal of Food Engineering 24, no. 3 (January 1995): 285–94. http://dx.doi.org/10.1016/0260-8774(95)90047-f.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Chen, Liqin, Zaoqi Pan, and Guo-Hua Hu. "Residence time distribution in screw extruders." AIChE Journal 39, no. 9 (September 1993): 1455–64. http://dx.doi.org/10.1002/aic.690390905.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Pattanaik, Biplab R., Ajay Gupta, and Hariharan S. Shankar. "Residence Time Distribution Model for Soil Filters." Water Environment Research 76, no. 2 (March 2004): 168–74. http://dx.doi.org/10.2175/106143004x141708.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Residence time distribution"

1

Murphy, Terry 1955. "Residence time distribution of solid particles in a CSTR." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=79251.

Full text
Abstract:
When mixing in a tank is insufficient solid particles are known to form a concentration gradient along the height. The one-dimensional sedimentation dispersion model provides a relationship between mixing parameters and the solids concentration gradient. An investigation of the relationship between the solid mixing properties and the solids residence time distribution, as derived from the sedimentation dispersion model has been conducted. Experimental results show that the solids residence time distribution was a function of particle size and differed from that for the liquid phase. An empirical correlation for the solids Peclet number to predict the residence time distribution of the particles is proposed. A single parameter model to predict the solids residence time distribution as a function of particle size is presented. The influence of the particle concentration gradient on the mean conversion obtained in the reactor for two different cases is examined.
APA, Harvard, Vancouver, ISO, and other styles
2

Nadeau, Patrice. "Measurement of residence time distribution by laser absorption spectroscopy." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22666.

Full text
Abstract:
The residence time distribution was measured at ambient temperature and pressure in a tubular reactor with radial injection at very short space times (0.04-0.7 s). A technique using infrared laser absorption spectroscopy was developed and used to provide the required rapid response for concentration measurements. The equipment comprised an infrared He-Ne laser emitting at a wavelength of 3.39$ mu m$ and a lead selenide detector. Methane, which absorbs strongly at the laser wavelength, was used as the tracer. The absorption of the laser light was related to the tracer concentration by Beer-Lambert law. The laser beam passed through the diameter of the reactor at different axial locations. The residence time distributions were obtained from the response to quasi-step inputs. An axial dispersion model was used to describe the reactor.
APA, Harvard, Vancouver, ISO, and other styles
3

Hopley, Alexandra. "Liquid Residence Time Distribution in Micro-reactors with Complex Geometries." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37111.

Full text
Abstract:
Micro-reactors, enabling continuous processes at small scales, have been of growing interest due to their advantage over batch. These advantages include better scaling, as well as improved mass and heat transfer, though many new challenges arise due to the small scales involved such as non-negligible entrance effects and significant pressure drops. The flow in coils, rectangular channel serpentine plates, mix-and-reside plates, and complex liquid-liquid mixing plates was investigated and characterized using residence time distribution (RTD) tests. A pulse test was used to determine the RTD curve shape of these reactors at flowrates ranging from 20 to 100 g/min. A semi-empirical, multi-parameter model was used to describe the asymmetrical curves, while the axial dispersion model was used to describe the symmetrical ones. The Peclet number is given in function of the Reynolds number for the liquid-liquid plates that were found to be near-plug flow (Pe > 100). In a continuous mixing plate, the Pe ranged from 190 to 475 with Pe increasing as Re increased. The effect of straight channel sections in micro-reactors is also evaluated. Longer straight segments between micromixers resulted in the development of unidirectional flow and the occurrence of tailing in the RTD. Finally, the suitability of a liquid-liquid plate for a reactive liquid-solid system is evaluated. The plugging is determined visually and by measuring pressure increase; pressure started to increase after 5 minutes and the experiment had to be halted after 10 minutes due to plugging. Parallels between the particle size distribution and the residence time distribution curves are drawn. The particle size distribution of silver chloride at low flow rates is much wider than at high flowrates. The average particle size at high flowrates was also much lower (≈69nm) than at low flowrates (≈112nm).
APA, Harvard, Vancouver, ISO, and other styles
4

TANYEL, ZEYNEP. "Residence Time Distribution of Multiple Particles in Four Configurations of Holding Tubes." NCSU, 2004. http://www.lib.ncsu.edu/theses/available/etd-08102004-124311/.

Full text
Abstract:
Residence time distributions of multiple particles (as affected by process and system parameters) were investigated during non-Newtonian tube flow. Process parameters included flow rate, particle type, carrier fluid viscosity, and particle concentration. The system parameter of interest was the holding tube configuration. Polystyrene and acrylic particles were used as model food particles. Digital imaging analysis was used to obtain residence time data of particles. A novel type of holding tube (chaotic holding tube) was constructed. Comparisons among the straight, single helical, double helical, and chaotic holding tube were performed in terms residence time distribution (RTD) of particles. In addition, the effect of inclination angle (0 º and 45 º) of the chaotic holding tube was investigated. It was found that the narrowest RTD of particles was obtained in the single helical holding tube. RTstd in the chaotic holding tube was greater than that in the single helical holding tube, but lower than those in the straight and double helical holding tubes. The most significant process parameter affecting RTD was flow rate. The effect of flow rate was more pronounced for high density (acrylic) particles. Carrier fluid viscosity, particle type, and particle concentration did not have significant effects on the overall RTstd. Trends observed in the chaotic holding tube were similar to those observed in the single helical holding tube. However, there were some cases where use of chaotic holding tube resulted in narrower RTD of particles. Changing the inclination angle from 0 º to 45 º in the chaotic holding tube resulted in wider RTD of both types of particles.
APA, Harvard, Vancouver, ISO, and other styles
5

Higgins, Philip Richard. "The characterisation of the hydrodynamic vortex separator using residence time distribution analysis." Thesis, Liverpool John Moores University, 2000. http://researchonline.ljmu.ac.uk/5534/.

Full text
Abstract:
The hydrodynamic vortex separator (HDVS) is currently employed at wastewater treatment works and in the sewerage system as a combined sewer overflow (CSO) for the separation of solids from an incoming waste stream. This project presents the first stage in developing and aiding the existing design methodology for the optimisation of kinetic processes within the HDVS. The kinetic process design methodology combines hydraulic and kinetic principles by using the true mixing regime characteristics of a system and batch reactor data to determine a kinetic processes efficiency. This project used residence time distribution (RTD) analysis to extensively characterise the mixing regime within a model and prototype HDVS. The HDVS was operated with and without a baseflow component and with and without the sludge hopper for a range of inlet flow rates and flow splits covering design flow rates for a number of existing applications. The RTD was obtained using a pulse tracer injection method and described using the complete range of data analysis techniques typical employed in RTD studies. This includes the axial dispersion model (ADM), tanks-in-series model (TISM), RTD indices and a RTD combined mathematical model. The combined model is configured to quantify the inactive flow behaviour within the HDVS i. e. stagnant and dead volumes. The HDVS has a complex imperfect plug-flow mixing regime. This non-ideal flow behaviour is associated with both dispersion and dead volumes and results in short-circuiting. At low flow rates the HDVS operating without a baseflow contains fluid elements which conduct flow slower than the mean velocity. At high flow rates the inactive flow behaviour is associated with dead volumes and subsequently short-circuiting. The flow rate at which this change in mixing characteristics occurs is termed the transition flow rate and is approximately 151/min and 901/min for the model and prototype HDVS respectively. At all flow rates above the transition flow rate the HDVS has a very stable mixing regime, which is associated with both the inactive flow behaviour and the plug-flow mixing characteristics. The ADM and TISM parameters increase as the flow rate decreases and therefore, the HDVS has improved plug-flow mixing characteristics and reduced dispersion at low flow rates. Removing the sludge hopper reduces the inactive flow behaviour and improves the plug-flow mixing characteristics. The inactive flow behaviour within the model HDVS operating with no baseflow occupies approximately 20-40% of the total volume and similarly for the prototype HDVS 5-25% and increases as the inlet flow rate increases. The inactive flow behaviour occupies a smaller fraction of the total volume and the plug-flow mixing characteristics are also improved as the HDVS is scaled-up in size. Hence, the scale-up of the HDVS will provide a mixing regime with less short-circuiting and improved plug-flow mixing characteristics and therefore, more conducive for certain kinetic processes and particularly chemical disinfection processes. The introduction of a baseflow component alters the total mixing regime within the HDVS. The baseflow component introduces an element of plug-flow mixing and subsequently the total plug-flow mixing characteristics of the HDVS operating with a baseflow component are greater than the HDVS operating without a baseflow. The baseflow component plug-flow mixing characteristics increase and the overflowcomponent decrease as the inlet flow rate increases. Short-circuiting of the baseflow and overflow component occurs as the inlet flow rate decreasesa nd increasesr espectively. Hence, there are different mixing regimes within the HDVS associated with the overflow and baseflow component. The HDVS operating with a baseflow component has improved plug-flow mixing characteristics when the sludge hopper is included. This project was also extended to include an experimental kinetic process analysis, by investigating the first-order decomposition of hydrogen peroxide (H202) using catalase. This was undertaken to compare the actual kinetic process performance within the HDVS to that estimated using the RTD. The H202 decomposition results showed that the design of the HDVS for kinetic processes can be achieved using only the RTD and relevant batch reactor data. This enables the HDVS to be optimised for kinetic process applications and eliminates the need for costly and time consuming pilot trials. The characterisation of the HDVS using RTD analysis creates scope for significant future research. This includes: alternative experimental RTD techniques, development of the RTD combined mathematical model to include a baseflow component and kinetic process principles, extensive kinetic process batch reactor investigations, application of both the hydraulic and kinetic data into chemical reactor design computer software and finally the scaling of the HDVS using the RTD and therefore the kinetic process optimisation. This work is a proactive response by practitioners and Hydro International Plc to pressure from the regulators and EU Directives, placing emphasis on the use of sophisticated treatment processes based on good scientific principles, to meet current and future stringent water quality standards.
APA, Harvard, Vancouver, ISO, and other styles
6

Kennedy, Dennis Lee. "Redesign of Industrial Column Flotation Circuits Based on a Simple Residence Time Distribution Model." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/35510.

Full text
Abstract:
The potential for improved selectivity has made column flotation cells a popular choice for upgrading fine coal. Unfortunately, recent production data from full-scale column plants indicate that many industrial installations have failed to meet original expectations in terms of clean coal recovery. Theoretical studies performed using a simple dispersion model showed that this inherent shortcoming could be largely minimized by reconfiguring the columns to operate in series as a cell-to-cell circuit. Follow-up field data showed that this low-cost modification increased flotation recovery as predicted by the dispersion model. This study presents the key findings obtained from the field investigation and provides generic guidelines for designing multi-stage column circuits.
Master of Science
APA, Harvard, Vancouver, ISO, and other styles
7

Choi, Mee H. "Residence time distribution as a measure for stochastic resonance in a bistable system." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/29349.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Chen, Dong. "An on-line measurement of residence time distribution in a twin-screw extruder /." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61235.

Full text
Abstract:
The importance of the residence time distribution (RTD) in polymer extrusion has been recognized for along time, however, it is very difficult to measure. In this project, an optical on-line RTD measurement technique based on extrudate transmittance changes was investigated. A He-Ne laser beam was the light source, and carbon black was the tracer and detection was performed by a photomultiplier.
The RTD of a ZSK-30 twin-screw extruder was measured with and without an in-line rheometer installed. Various operating conditions were used to examine their effects on the RTD curve. It was found that the mean residence time of the system decreased linearly with screw speed and exponentially with the feed rate. The temperature effect was minuscule. The in-line rheometer increased the mean residence time of the system by 80%.
APA, Harvard, Vancouver, ISO, and other styles
9

Tiev, Visoth. "Vegetation and discharge effects on the hydraulic residence time distribution within a natural pond." Thesis, University of Warwick, 2011. http://wrap.warwick.ac.uk/49201/.

Full text
Abstract:
Results are presented from sets of field and laboratory experiments conducted to measure and quantify the Hydraulic Residence Time Distribution in treatment ponds containing vegetation. The field measurements were taken in the Lyby field pond (Sweden) with complementary experiments on a distorted, laboratory scale model pond designed and built in the University of Warwick’s engineering laboratory. Rhodamine WT Dye tracer experiments were used in both the Lyby field pond and the distorted physical scale model to investigate vegetation and discharge affects on HRTD characteristics and the technique of PIV (Particle Image Velocimetry) was used in the distorted physical scale model to investigate how surface flow profiles were affected by different vegetation and discharge configurations. The results show that the distorted physical scale pond did not reflect the HRTD characteristics of the field site, with the actual residence time, (tm), for the distorted physical scale pond ranging from 85 % to 125% of its nominal residence time. For the distorted scale model, pond vegetation and discharge did not affect the relative HRTD centroid, em, or the actual residence time, tm. This finding is attributed to the unique pond geography and associated aspect ratios However, flow rates did have a significant effect on the HRTD e0 (time of first dye arrival at the outlet) and ep (time of peak dye concentration). Changes in vegetation were found to have little effect on e0 and ep. For the laboratory pond, vegetation had a significant control on the surface flow field whereas, flow rates did not – the latter suggests that surface flow fields are not representative of the internal flow field in different layers of the pond. The experiments demonstrate that the specific shape of the distorted physical scale pond in this study enables optimal actual resident times to be achieved over a wide range of vegetation and flow rate configurations. If full scale field ponds based upon this design give the same stable centroid results, then this would be a substantial breakthrough in pond design, which would aid the design and management of pond treatment and allow more robust optimisation of treatment efficiency.
APA, Harvard, Vancouver, ISO, and other styles
10

Salengke, C. "Residence time distribution of model food particles in the curved section of holding tube." The Ohio State University, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=osu1301602949.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Residence time distribution"

1

Langarkhorshid, Alimuhammad Rezaeipour. A study of heat transfer, pressure drop and residence time distribution for two-phase, two component flow in a plate and frame heat exchanger. London: North East London Polytechnic, 1985.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Arriola, Enrique. Residence time distribution of solids in staged spouted beds. 1997.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Pongsivapai, Pajongwit. Residence time distribution of solids in a multi-compartment fluidized bed system. 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Lasalle, Cigdem. A mathematical model of residence time distribution in a series of equal-sized well-mixed vessels. Universityof East London, 1993.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Phimolmas, Varut. The effect of temperature and residence time on the distribution of carbon, sulfur, and nitrogen between gaseous and condensed phase products from low temperature pyrolysis of kraft black liquor. 1996.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Lippert, Amy K. DeFalco. From the Cradle to the Grave: Visualizing the Life Cycle. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190268978.003.0005.

Full text
Abstract:
Images were so bound up with the concept of mortality, and such potent reminders of the unceasing and irreversible onslaught of time, that they soon came to play a critical role as markers along the key junctures of both individual and family lifespans in nineteenth-century America. They commemorated births, deaths, and everything in between. The residents of a far-flung city like San Francisco were all the more reliant on two-dimensional substitutes for their absent kin. Painted portraits and miniatures had previously served similar functions as documentation of significant events or achievements, but only as mediated by an artist’s hand, with a limited replication and distribution capacity, and primarily for a small upper echelon of the population. It was fitting that photography, the most democratic of all media, should preserve memories of loved ones after their demise—death being among the most democratic of life experiences.
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Residence time distribution"

1

Johnson, Martin D., Scott A. May, Jennifer Mc Clary Groh, Luke P. Webster, Vaidyaraman Shankarraman, Richard D. Spencer, Carla Vanesa Luciani, Christopher S. Polster, and Timothy Braden. "Understanding Residence Time, Residence Time Distribution, and Impact of Surge Vessels." In Continuous Pharmaceutical Processing, 51–85. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-41524-2_3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Mory, Mathieu. "Hydrodynamics and Residence Time Distribution - Stirring." In Fluid Mechanics for Chemical Engineering, 171–92. Hoboken, NJ USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118617175.ch9.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Razavi, Sonia M., Atul Dubey, and Fernando J. Muzzio. "Residence Time Distribution in Continuous Manufacturing." In Continuous Pharmaceutical Processing and Process Analytical Technology, 111–24. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003149835-4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Schweich, D. "Flow in Porous Media and Residence Time Distribution." In Springer Proceedings in Physics, 329–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-93301-1_39.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Groβ, Gregor Alexander, and Johann Michael Koöhler. "Residence Time Distribution and Nanoparticle Formation in Microreactors." In Microfluidic Devices in Nanotechnology, 317–40. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470622636.ch9.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Jain, Prince Kumar, Kajal Dhole, Samiran Sengupta, Nilesh Gohel, Vimal Kotak, and Sujay Bhattacharya. "Experimental and numerical simulation for residence time distribution of deactivation tank." In Aerospace and Associated Technology, 95–100. London: Routledge, 2022. http://dx.doi.org/10.1201/9781003324539-17.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Guo, L., and S. Yang. "Residence Time Distribution of Solid and Liquid Phase in a Stirred Tank Reactor." In Fluid Mechanics and Its Applications, 247–51. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-015-7973-5_28.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Fewster, Rachel M., and Nathalie J. Patenaude. "Cubic Splines for Estimating the Distribution of Residence Time Using Individual Resightings Data." In Modeling Demographic Processes In Marked Populations, 393–415. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-0-387-78151-8_17.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Reed, G. "Measurement of residence times and residence-time distributions." In Radioisotope Techniques for Problem-Solving in Industrial Process Plants, 112–37. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4073-4_9.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Kordas, Marian, Daniel Pluskota, and Rafał Rakoczy. "The Characterization of the Residence Time Distribution in a Fluid Mixer by Means of the Information Entropy." In Lecture Notes on Multidisciplinary Industrial Engineering, 201–16. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73978-6_14.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Residence time distribution"

1

DiGiano, Francis A., Andrew Westbrook, and Weidong Zhang. "Residence Time from Tracer Tests: Field Experience and Calculation Techniques." In Eighth Annual Water Distribution Systems Analysis Symposium (WDSA). Reston, VA: American Society of Civil Engineers, 2008. http://dx.doi.org/10.1061/40941(247)141.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Li, Genong, Aniruddha Mukhopadhyay, Chi-Yang Cheng, and Yi Dai. "Various Approaches to Compute Fluid Residence Time in Mixing Systems." 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-icnmm2010-30771.

Full text
Abstract:
Residence time including mean residence time and residence time distribution (RTD) is a very important parameter to characterize a mixing system. In practice, tracer study has been widely used in experiments to obtain residence time distribution. There are several numerical approaches available to compute the average residence time and the residence time distribution of a system. This paper attempts to summarize those available approaches through an example.
APA, Harvard, Vancouver, ISO, and other styles
3

Houlihan, John, Guillaume Huyet, Thomas Busch, Stephan P. Hegarty, David Goulding, David Curtin, and Cristina Masoller. "Distribution of residence times in bistable noisy systems with time-delayed feedback." In Second International Symposium on Fluctuations and Noise, edited by Zoltan Gingl. SPIE, 2004. http://dx.doi.org/10.1117/12.547017.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Coblyn, Matthew, Agnieszka Truszkowska, and Goran Jovanovic. "Application of Residence Time Distribution Analysis in Microchannel Hemodialysis Devices." In ASME 2013 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/sbc2013-14362.

Full text
Abstract:
Current hemodialysis techniques rely on hollow-fiber tubes in a tube-and-shell operating approach. The method works satisfactorily; but, technological advantages of this method are already exhausted for a long time. Additional improvements are needed which could provide a way towards improving patient health and quality of life. Patients with renal failure undergo intense filtration sessions approximately three times a week leaving them fatigued. Large oscillations in concentration of various solutes within blood cause detrimental consequences on the overall health of patients.
APA, Harvard, Vancouver, ISO, and other styles
5

Tzatchkov, V. G., A. Martin-Dominguez, and R. D. Hernandez-Lopez. "Residence Time Distribution and Disinfectant Mixing in Private Water Tanks." In 2015 International Conference on Environmental Science and Sustainable Development (ICESSD 2015). WORLD SCIENTIFIC, 2016. http://dx.doi.org/10.1142/9789814723039_0026.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Tzatchkov, V. G., S. G. Buchberger, and A. Martin-Dominguez. "Probabilistic Approach to Residence-Time Distribution in Water Treatment Units." In World Water and Environmental Resources Congress 2005. Reston, VA: American Society of Civil Engineers, 2005. http://dx.doi.org/10.1061/40792(173)142.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Fischer, Maximilian, and Norbert Kockmann. "Enhanced Convective Mixing and Residence Time Distribution in Advanced Micromixers." In ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icnmm2012-73275.

Full text
Abstract:
Homogeneous mixing of liquids in microchannels is well known and characterized for simple channel geometries, such as Y- or T-shaped mixers. Also meandering mixing channels, in which Dean vortices are generated, are often employed to achieve rapid mixing of liquids. A CFD study was performed to increase the mixing performance in the contacting and first mixing element. Dean vortices in the inlet channels increase the mixing quality for Re numbers in the range from 20 to 200 together with S-shaped mixing elements. Mixing quality is significantly increased by a factor of 2 to more than 5 compared to a T-shaped mixer. The residence time distribution is a further important parameter, which is investigated in this contribution.
APA, Harvard, Vancouver, ISO, and other styles
8

Ruprecht, Nora Alina, and Reinhard Kohlus. "Determination and modelling of the particle size dependent residence time distribution in a pilot plant spray dryer." In 21st International Drying Symposium. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/ids2018.2018.7740.

Full text
Abstract:
The residence time distribution (RTD) in a pilot plant spray dryer was characterised for two kinds of air distributors (centrifugal and parallel flow) and for different atomizing air pressures. To determine the RTD - and the RTD of different particle size fractions - the particle concentration and size at the dryer outlet was measured continuously using a particle counter. Results were modelled using the Bodenstein number and the CSTR in series model. An increasing nozzle pressure leads to a decrease in mean residence time and a more narrow distribution. The influence of nozzle pressure is more pronounced than of air distributor and particle size fraction. Keywords: Residence time distribution; Particle size; Bodenstein number modelling; Nozzle influence; Mechanism of air distribution
APA, Harvard, Vancouver, ISO, and other styles
9

Kockmann, Norbert, Waldemar Krieger, and Mira Schmalenberg. "Design and Scale-up of Modular Capillary Helical Flow Inverter Reactors With Narrow Residence Time Distribution." In ASME 2019 17th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/icnmm2019-4237.

Full text
Abstract:
Abstract Lab-on-chip processes often require long dwelling times leading to coiled capillary reactors with laminar flow. These tubular reactors are designed for a reaction time, unfortunately with a wide residence time distribution. This contribution presents a modular concept based on coiled flow inverters (CFI), which achieve high radial mixing with narrow residence time distribution at low Reynolds numbers [1]. The modular design enables quick adaptation to changing residence times and flow rates with low pressure loss. The tube diameters range from capillaries with a few 100 μm to several millimeters for high throughput and long residence time. With the aid of a design space diagram, the required pipe diameters and lengths can be quickly determined based on standardized coil diameters [2]. The modular concept enables various arrangements for different residence time and flow rate requirements with minimum pressure loss. In the laboratory, for example, a chemical process in the throughput range of a few grams per hour can be developed and processed in the simple device. The results can be scaled via the platform concept to higher production rates with constant residence time characteristics. The scale-up concept can easily be displayed and designed graphically in the reactor performance diagram.
APA, Harvard, Vancouver, ISO, and other styles
10

Bosˇkovic´, Dusˇan, and Stefan Lo¨bbecke. "Measurement and Modelling of the Residence Time Distribution in Microfluidic Devices." In ASME 4th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2006. http://dx.doi.org/10.1115/icnmm2006-96099.

Full text
Abstract:
An experimental method has been developed to measure the residence time distribution (RTD) in continuously operated microfluidic devices. RTD measurements are performed by a stimulus-response technique using a special dye as a tracer. The tracer concentration is spectroscopically measured at two points of the setup, one close to the inlet and the other close to the outlet. The experimental setup provides sufficient flexibility since microfluidic devices can be easily exchanged and thus individually analysed. The method was optimized in order to achieve high repeatability and to eliminate errors, such as low measuring frequencies and tracer adsorption on the microchannel walls. The measured concentration profiles were used for modeling the RTD in the microfluidic devices investigated. Since the measured overall signal is influenced by the RTD behaviour of other setup components (e.g. capillaries) has been it must be deconvoluted to obtain the RTD of the microfluidic device solely. In this work, RTD measurement and modeling was performed exemplarily for one split-and-recombine micromixer. It turned out that conventional models that are used to describe the RTD of macroscopic reactors are not suitable to describe the RTD on the micro scale adequately. The asymmetric distribution caused by the laminar flow in microchannels is better approximated by empirical models.
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Residence time distribution"

1

Jones, M., and R. Perkins. Residence time distribution approach to the study of free convection in porous media. Office of Scientific and Technical Information (OSTI), June 1988. http://dx.doi.org/10.2172/5251292.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Lee, L. Residence time distributions for ETF pH adjustment system. Office of Scientific and Technical Information (OSTI), March 1989. http://dx.doi.org/10.2172/6238756.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Walsh, Alex. The Contentious Politics of Tunisia’s Natural Resource Management and the Prospects of the Renewable Energy Transition. Institute of Development Studies (IDS), February 2021. http://dx.doi.org/10.19088/k4d.2021.048.

Full text
Abstract:
For many decades in Tunisia, there has been a robust link between natural resource management and contentious national and local politics. These disputes manifest in the form of protests, sit-ins, the disruption of production and distribution and legal suits on the one hand, and corporate and government response using coercive and concessionary measures on the other. Residents of resource-rich areas and their allies protest the inequitable distribution of their local natural wealth and the degradation of their health, land, water, soil and air. They contest a dynamic that tends to bring greater benefit to Tunisia’s coastal metropolitan areas. Natural resource exploitation is also a source of livelihoods and the contentious politics around them have, at times, led to somewhat more equitable relationships. The most important actors in these contentious politics include citizens, activists, local NGOs, local and national government, international commercial interests, international NGOs and multilateral organisations. These politics fit into wider and very longstanding patterns of wealth distribution in Tunisia and were part of the popular alienation that drove the uprising of 2011. In many ways, the dynamic of the contentious politics is fundamentally unchanged since prior to the uprising and protests have taken place within the same month of writing of this paper. Looking onto this scene, commentators use the frame of margins versus centre (‘marginalization’), and also apply the lens of labour versus capital. If this latter lens is applied, not only is there continuity from prior to 2011, there is continuity with the colonial era when natural resource extraction was first industrialised and internationalised. In these ways, the management of Tunisia’s natural wealth is a significant part of the country’s serious political and economic challenges, making it a major factor in the street politics unfolding at the time of writing.
APA, Harvard, Vancouver, ISO, and other styles
4

Suh, Jooyeoun, Changa Dorji, Valerie Mercer-Blackman, and Aimee Hampel-Milagrosa. Valuing Unpaid Care Work in Bhutan. Asian Development Bank, November 2020. http://dx.doi.org/10.22617/wps200065-2.

Full text
Abstract:
A growing body of scholarly literature has attempted to measure and value unpaid care work in various countries, but perhaps only the government statistical agencies in the United States and the United Kingdom have seriously undertaken periodic and systematic measures of the time spent on unpaid work at the national level, and partially incorporated those values into their gross domestic product(GDP). One country that has been ahead of its time on aspects of societal welfare measurement is Bhutan, which produces the Gross National Happiness (GNH) Index. However, until the first GNH Survey, in 2008, Bhutan did not have any sense of the size and distribution of unpaid work, despite its strong societal norms about the value of volunteering and community work. This paper is the first to estimate the value of unpaid care work in Bhutan. It shows the pros and cons of various approaches and their equivalent measures of unpaid care work as a share of GDP. As with similar studies on the topic, this paper also finds that women spend more than twice as much time as men performing unpaid care work, regardless of their income, age, residency, or number of people in the household. The paper also provides recommendations for improving the measurement of unpaid care work in Bhutan.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Residence time distribution' for particular source types:
Journal articles Dissertations / Theses
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!

To the bibliography