1,721,052 research outputs found
Enhancing Heat Exchanger Performance: Integrating Computational Modeling and Experimental Studies for Optimization Approaches
No full textOne significant challenge continually encountered by manufacturers of heat exchangers is the imperative for a design approach grounded in technological innovation aimed at producing devices that are not only more thermally efficient, but also feature reduced pressure drop, volume, manufacturing and operational costs and high-quality surface finishing to mitigate fouling phenomena [1].
A strategy that has been successfully explored in literature to achieve this goal consists in the use of emerging additive manufacturing technologies, that enable to produce surfaces with an optimized morphology [2]. This challenge requires a multidisciplinary approach that couples the advantages of numerical approaches to experimental advanced measurement and data processing procedures, mostly based on highly resolved infrared thermographic systems [3]. The possibility of obtaining detailed information about the heat transfer capability of enhanced surfaces can be suitably achieved by using numerical tools in the optimization problem that adopts experimental data as a necessary either input or validation elements [4].
The present contribution aims at presenting some applications of the two complementary approaches (numerical and experimental) with regards to heat transfer enhancement passive solutions implemented in heat exchangers
The finite element method: discretization and application to heat convection problems
No full textIn this chapter, we give an overviewof the finite element method and its applications
to heat and fluid flow problems. An introduction to weighted residual approximation
and finite element method for heat and fluid flow equations are presented.
The characteristic–based split (CBS) algorithm is also presented for solving the
incompressible thermal flow equations. The algorithm is based on the temporal discretization
along the characteristics, and the high-order stabilization terms appear
naturally from this kind of discretization. The artificial compressibility (AC) and the
semi-implicit (SI) versions of the CBS scheme are presented and some examples
are also given to demonstrate the main features of both the schemes
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Nonlinear stability analysis of fluid flow with viscous dissipation in a porous channel
No full textThe nonlinear convective instability of flow in a fluid saturated rectangular porous channel of arbitrary aspect ratio is here investigated by taking into account the effect of viscous dissipation. A laminar throughflow of constant velocity is assumed. The system is characterized by a unique source of thermal instability identified in the internal heat generation due to the viscous dissipation. The nonlinear analysis is performed by means of the generalized integral transform technique (GITT). The results obtained are compared with those coming from the linear analysis carried out numerically by means of the normal modes method
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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