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Article
Publication date: 22 August 2024

Antar Tahiri, Haroun Ragueb, Mustafa Moussaoui, Kacem Mansouri, Djemaa Guerraiche and Khelifa Guerraiche

This paper aims to present a numerical investigation into heat transfer and entropy generation resulting from magnetohydrodynamic laminar flow through a microchannel under…

31

Abstract

Purpose

This paper aims to present a numerical investigation into heat transfer and entropy generation resulting from magnetohydrodynamic laminar flow through a microchannel under asymmetric boundary conditions. Furthermore, the authors consider the effects of viscous dissipation and Joule heating.

Design/methodology/approach

The finite difference method is used to obtain the numerical solution. Simulations are conducted across a broad range of Hartmann (Ha = 0 ∼ 40) and Brinkman (Br = 0.01 ∼ 1) numbers, along with various asymmetric isothermal boundaries characterized by a heating ratio denoted as ϕ.

Findings

The findings indicate a significant increase in the Nusselt number with increasing Hartmann number, regardless of whether Br equals zero or not. In addition, it is demonstrated that temperature differences between the microchannel walls can lead to substantial distortions in fluid temperature distribution and heat transfer. The results reveal that the maximum entropy generation occurs at the highest values of Ha and η (a dimensionless parameter emerging from the formulation) obtained for ϕ = −1. Moreover, it is observed that local entropy generation rates are highest near the channel wall at the entrance region.

Originality/value

The study provides valuable insights into the complex interactions between magnetic fields, viscous dissipation and Joule heating in microchannel flows, particularly under asymmetric heating conditions. This contributes to a better understanding of heat transfer and entropy generation in advanced microfluidic systems, which is essential for optimizing their design and performance.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 34 no. 10
Type: Research Article
ISSN: 0961-5539

Keywords

Available. Content available
Book part
Publication date: 14 July 2006

Abstract

Details

The Hidden History of 9-11-2001
Type: Book
ISBN: 978-1-84950-408-9

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Article
Publication date: 5 October 2022

Parvathidevi A. and Naga Satish Kumar Ch

This study aims to assess the efficacy of thermal analysis of concrete slabs by including different insulation materials using ANSYS. Regression equations were proposed to predict…

199

Abstract

Purpose

This study aims to assess the efficacy of thermal analysis of concrete slabs by including different insulation materials using ANSYS. Regression equations were proposed to predict the thermal conductivity using concrete density. As these simulation and regression analyses are essential tools in designing the thermal insulation concretes with various densities, they sequentially reduce the associated time, effort and cost.

Design/methodology/approach

Two grades of concretes were taken for thermal analysis. They were designed by replacing the natural fine aggregates with thermal insulation aggregates: expanded polystyrene, exfoliated vermiculite and light expanded clay. Density, temperature difference, specific heat capacity, thermal conductivity and time were measured by conducting experiments. This data was used to simulate concrete slabs in ANSYS. Regression analysis was performed to obtain the relation between density and thermal conductivity. Finally, the quality of the predicted regression equations was assessed using root mean square error (RMSE), mean absolute error (MAE), integral absolute error (IAE) and normal efficiency (NE).

Findings

ANSYS analysis on concrete slabs accurately estimates the thermal behavior of concrete, with lesser error value ranges between 0.19 and 7.92%. Further, the developed regression equations proved accurate with lower values of RMSE (0.013 to 0.089), MAE (0.009 to 0.088); IAE (0.216 to 5.828%) and higher values of NE (94.16 to 99.97%).

Originality/value

The thermal analysis accurately simulates the experimental transfer of heat across the concrete slab. Obtained regression equations proved helpful while designing the thermal insulation concrete.

Details

World Journal of Engineering, vol. 21 no. 1
Type: Research Article
ISSN: 1708-5284

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Article
Publication date: 4 November 2024

Jiaqi Fang, Kun Ma, Yanfang Qiu, Ke Ji, Zhenxiang Chen and Bo Yang

The discrepancy between the content of an article and its title is a key characteristic of fake news. Current methods for detecting fake news often ignore the significant…

20

Abstract

Purpose

The discrepancy between the content of an article and its title is a key characteristic of fake news. Current methods for detecting fake news often ignore the significant difference in length between the content and its title. In addition, relying solely on textual discrepancies between the title and content to distinguish between real and fake news has proven ineffective. The purpose of this paper is to develop a new approach called semantic enhancement network with content–title discrepancy (SEN–CTD), which enhances the accuracy of fake news detection.

Design/methodology/approach

The SEN–CTD framework is composed of two primary modules: the SEN and the content–title comparison network (CTCN). The SEN is designed to enrich the representation of news titles by integrating external information and position information to capture the context. Meanwhile, the CTCN focuses on assessing the consistency between the content of news articles and their corresponding titles examining both emotional tones and semantic attributes.

Findings

The SEN–CTD model performs well on the GossipCop, PolitiFact and RealNews data sets, achieving accuracies of 80.28%, 86.88% and 84.96%, respectively. These results highlight its effectiveness in accurately detecting fake news across different types of content.

Originality/value

The SEN is specifically designed to improve the representation of extremely short texts, enhancing the depth and accuracy of analyses for brief content. The CTCN is tailored to examine the consistency between news titles and their corresponding content, ensuring a thorough comparative evaluation of both emotional and semantic discrepancies.

Details

International Journal of Web Information Systems, vol. 20 no. 6
Type: Research Article
ISSN: 1744-0084

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Article
Publication date: 23 May 2019

Jane Margrete Askeland Hellerud and Trine Lise Bakken

The purpose of this paper is to investigate the families’ and professional caregivers’ experience of mental health services for patients in the migrant population with…

233

Abstract

Purpose

The purpose of this paper is to investigate the families’ and professional caregivers’ experience of mental health services for patients in the migrant population with intellectual disability (ID).

Design/methodology/approach

To highlight this rarely studied topic, the authors chose a qualitative approach, using a semi-structured interview guide. The authors performed a search for relevant articles. Three families of former patients of a specialized psychiatric inpatient unit and 12 professional caregivers were interviewed. The interviews were taped, transcribed and analyzed using a thematic analysis.

Findings

In total, 17 themes from the families’ answers and 14 themes from the caregivers’ answers were grouped into four main themes each. Two main themes were identical for both groups: perspectives on mental illness and “the Norwegian system.” Additionally, the families were concerned about the impact on the patient and family and coping strategies. The caregivers highlighted patient–caregiver interaction and family–caregiver interaction.

Research limitations/implications

Further research should include the patients’ opinions based on the findings of this study. Also, studies including larger samples from both specialist services and community services are needed to develop evidence-based services for these patients.

Practical implications

Proposed adaptations to enable assessment and treatment of mental illness in migrants with ID should be adapted to cultural preferences. The following adaptations are proposed: inclusion of the entire family, awareness of cultural dimensions, information about the health care system, education in mental illness, the use of interpreters and adequate time spent with the families.

Originality/value

Mental health services for this group are an understudied topic. Clinical experience indicates that professionals struggle when providing services for such patients.

Details

Advances in Mental Health and Intellectual Disabilities, vol. 13 no. 2
Type: Research Article
ISSN: 2044-1282

Keywords

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