9 results on '"Ellis model"'
Search Results
2. Theoretical study of silver nanoparticle suspension in electroosmosis flow through a nonuniform divergent channel with compliant walls: A therapeutic application
- Author
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Muhammad Irfan, Imran Siddique, Mubbashar Nazeer, and Waqas Ali
- Subjects
Compliant walls ,Nanofluid ,Nonuniform channel ,Silver nanoparticles ,Ellis model ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
This study explores the effect of silver nanoparticles on heat transfer and flow behavior within the context of the Ellis fluid model. It specifically considers electroosmotic forces in a nonuniform divergent channel with compliant walls. The analysis involves studying thermal transport in silver-blood nanofluid flow, using MATHEMATICA 13.2 software to obtain exact solutions for velocity and temperature distribution. Findings reveal that certain parameters, such as wall damping and wall elastic properties, increase skin friction, while compliant wall parameters generally reduce flow velocity. Additionally, wall rigidity and tension parameters lead to larger trapped boluses. Notably, a 1% concentration of nanoparticles enhances heat transfer by up to 13.75%, offering control over heat transfer rates. This research introduces a novel perspective by examining compliant wall impacts on heat transfer analysis in the context of electroosmotic flow within the Ellis fluid model, incorporating silver nanoparticles with potential therapeutic applications due to their antibacterial properties.
- Published
- 2024
- Full Text
- View/download PDF
3. Heat transfer analysis of single-walled carbon nanotubes in Ellis's fluid model: Comparative study of uniform and non-uniform channels
- Author
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Muhammad Irfan, Imran Siddique, Mubbashar Nazeer, S. Saleem, and Neyara Radwan
- Subjects
Heat source ,Uniform/non-uniform channel ,Ellis model ,Electroosmotic flow ,Carbon nanotubes ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
Background: The essential features of nanoparticles in nanofluids play a vital role in nanotechnology. The nanosized particles of carbon are known as carbon nanotubes (CNTs). The properties of CNT like thermal and electrical conductivity, lightweight, flexibility, and mechanical strength support its applications in the medical field i.e., diagnostic and therapeutic agents (drugs, antibodies, biosensors, vaccines etc.). These are not only excellent vehicles for drug delivery and gene therapies but also useful in biosensor diagnostic, enantiomer separation of chiral drugs, tissue regeneration, extraction, and analysis of pollutants and drugs. Objective: The focus of this research work is to open the essential features of peristaltic transport of Ellis nanofluid through uniform and non-uniform channels with suspension of single-walled carbon nanotubes (SWCNT). The consideration of blood flow with SWCNT under the effects of heat generation and electroosmosis is one of the key factors of this investigation. Method: The complexity of the system is reduced with the implementation of the concepts of longer wavelength and lower Reynolds number. The governing two-dimensional equations are simplified by introducing dimensionless variables and parameters. The mathematical tool “MATHEMATICA 13.3” is used to compute the exact solution and graphical demonstration of velocity, temperature, heat transfer rate, and streamlines. Computational results: It is noticed that velocity, temperature, and heat transfer rate are prominent in non-uniform channels as compared to uniform channels. Similarly, the size and number of boluses during the trapping phenomenon increase or decrease quickly in non-uniform channels. The volumetric addition of SWCNT diminishes the velocity and temperature while the heat transfer rate is enhanced in both channels but in the nonuniform channel effects are more prominent. Applications: This study explores the applications of SWCNT in medical fields like angiography, angioplasty, and cancer therapy. Novelty: The present study is new and has never been addressed before.
- Published
- 2024
- Full Text
- View/download PDF
4. Roll of partial slip on Ellis nanofluid in the proximity of double diffusion convection and tilted magnetic field: Application of Chyme movement
- Author
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Yasir Khan, Maria Athar, Safia Akram, Khalid Saeed, Alia Razia, and A. Alameer
- Subjects
Slip boundaries ,Asymmetric channel ,Nanofluids ,Double diffusion convection ,Peristaltic pumping ,Ellis model ,Science (General) ,Q1-390 ,Social sciences (General) ,H1-99 - Abstract
The current study aims to investigate the effect of partial slip conditions over double diffusion convection. The phenomenon is applied with the inclined magnetic flux of peristaltic flow on Ellis nanofluid model in an asymmetric channel. The fundamental differential equations are constructed and solved through lubrication approximation that gives the coupled system of ordinary differential equations. This resultant system is further solved numerically, and graphic representation are used to physically comprehend the flow quantity data. The whole procedure is carried out under the trapping mechanism by drawing contour streamlines. The knowledge gained from this work will be useful in the creation of intelligent magneto-peristaltic pumps for specific heat and medication delivery phenomena.
- Published
- 2023
- Full Text
- View/download PDF
5. Thermal Convection of an Ellis Fluid Saturating a Porous Layer with Constant Heat Flux Boundary Conditions
- Author
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Pedro Vayssière Brandão, Michele Celli, Antonio Barletta, and Stefano Lazzari
- Subjects
mixed convection ,shear-thinning fluids ,Ellis model ,Thermodynamics ,QC310.15-319 ,Descriptive and experimental mechanics ,QC120-168.85 - Abstract
The present work analyzes the thermal instability of mixed convection in a horizontal porous channel that is saturated by a shear-thinning fluid following Ellis’ rheology. The fluid layer is heated from below by a constant heat flux and cooled from above by the same heat flux. The instability of such a system is investigated by means of a small-disturbances analysis and the resulting eigenvalue problem is solved numerically by means of a shooting method. It is demonstrated that the most unstable modes on the instability threshold are those with infinite wavelength and an analytical expression for such conditions is derived from an asymptotic analysis. Results show that the non-Newtonian character of the fluid has a destabilizing role.
- Published
- 2023
- Full Text
- View/download PDF
6. New Media in Information seeking behavior of Islamic Science Researches: A Case Study on Seminary
- Author
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zohreh eftekhar, soraya ziaei, and Hadi Sharif
- Subjects
new media ,ellis model ,information seeking behavior ,seminary ,fars and bushehr province ,Communication. Mass media ,P87-96 - Abstract
This paper aims to survey the method of Selecting subject to coping with Information Resources based on the Ellis model in Seminary base on new media, study 323 Students in Fars and Bushehr Province. The method of this study is a survey with analytical approach. Data collection tools in this study was questionnaire and in order to assess validity (content), and the questionnaire reliability was obtained by Cronbach alpha. Sampling is purposeful; Descriptive and analytical statistical methods such as Spearman's correlation coefficient, Kruskal-Wallis and Friedman tests were utilized. prying mind (2/6), reviewing of information resources (3/13), Sites in the Internet related to subjects or social networks (3/92), Using online databases or weblogs (3/48), Authority (3/7), Studying abstract (2/48), is so important for seminary students. The results showed that Students of Seminary selected different methods base on new media that selected by research population for Selecting subject to coping with Information Resources and its not based on the Ellis Model.
- Published
- 2022
- Full Text
- View/download PDF
7. Thrust Bearing with Rough Surfaces Lubricated by an Ellis Fluid
- Author
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A. Walicka, E. Walicki, P. Jurczak, and J. Falicki
- Subjects
pseudo-plastic fluid ,ellis model ,thrust bearing ,christensen roughness ,Mechanical engineering and machinery ,TJ1-1570 - Abstract
In the paper the influence of bearing surfaces roughness on the pressure distribution and load-carrying capacity of a thrust bearing is discussed. The equations of motion of an Ellis pseudo-plastic fluid are used to derive the Reynolds equation. After general considerations on the flow in a bearing clearance and using the Christensen theory of hydrodynamic rough lubrication the modified Reynolds equation is obtained. The analytical solutions of this equation for the cases of a squeeze film bearing and an externally pressurized bearing are presented. As a result one obtains the formulae expressing pressure distribution and load-carrying capacity. A thrust radial bearing is considered as a numerical example.
- Published
- 2014
- Full Text
- View/download PDF
8. A Study of compatibility between Iranian digital libraries user interface and the elements of Ellis model of information seeking behavior
- Author
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Yaghoub Norouzi and Naemeh Sokhanvari
- Subjects
Digital libraries ,User interface ,Information seeking behavior pattern ,Ellis model ,Evaluation studies ,Evaluation criteria ,Bibliography. Library science. Information resources - Abstract
The goal of this study is to evaluate the compatibility between Iranian digital libraries user interface and the elements of Ellis model of information seeking behavior. This study was performed using evaluation method with a checklist. This list is based on six features of Ellis model, "Starting", "Chaining", "Browsing", "Differentiating", "Monitoring" and "Extracting" and included 110 sub-components that have been developed using Delphi method. The population of this study included 5 library softwares: Azarakhsh, Simorgh, Papyrus, Payam and Parvan. Results showed that the average of scores of user interface of softwares is as follows: in Starting 99.6, Chaining 117.2, Browsing 29.6, Differentiating 53. 2, Monitoring 22.4 and Extracting 39. Among the softwares of digital libraries, according to the total score for elements of Ellis model (1080), Azarakhsh with 549 points is in the first rank and had the highest support for elements of Ellis model. It also became clear that Chaining with 586 points (%55) had the highest support in softwares of digital libraries. Also the elements of Chaining, Starting and Differentiating earned sequently the highest rank in softwares of digital libraries. Finally, testing research hypotheses with %95 confidence showed that among softwares of digital libraries there is no significant difference regarding the rate of support of elements of information seeking behavior of Ellis model.
- Published
- 2014
9. Database Graphic User Interface correspondence with Ellis Information Seeking behavior Model
- Author
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Muhammad Azami and Rahmatullah Fatahi
- Subjects
User Interface ,Information Seeking behavior ,databases ,Ellis Model ,Bibliography. Library science. Information resources - Abstract
Graphic User interface serves as a bridge between man and databases. Its primary purpose is to assist uses by establishing interaction with computer systems. Database user interface designers have seldom focused on the impact of user information seeking behaviors on the database user interface structures. Therefore, it is crucial to incorporate the user information seeking behavior within database software design as well as analyzing their impact on upgrade and optimization of user interface environment. The present study intends to determine the degree of correspondence of database interface with information seeking behavioral components of Ellis’ model. The component studied starting, chaining, browsing, differentiating, monitoring and extracting. Investigators employed direct observation method, using a checklist, in order to see how much the database interfaces support these components. Results indicated that the information seeking behavior components outlined by Ellis Model are not fully considered in database user interface design. Some of the components such as starting, chaining and differentiation were to some extent supported by some of database user interfaces studied. However elements such as browsing, monitoring and extracting have not been incorporated within the user interface structures of these databases. On the whole, the degree of correspondence and correlation of database user interfaces with Ellis information seeking components is about average. Therefore incorporating these elements in design and evaluation of user interface environment could have high impact on better optimization of database interface environment and consequently the very process of search and retrieval.
- Published
- 2010
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