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Article
Publication date: 3 June 2024

Ankita Bisht and Sanjalee Maheshwari

The purpose of this article is to present a mathematical model for the fully developed flow of Bi-viscous Bingham nanofluid through a uniform-width anisotropic porous channel. The…

35

Abstract

Purpose

The purpose of this article is to present a mathematical model for the fully developed flow of Bi-viscous Bingham nanofluid through a uniform-width anisotropic porous channel. The model incorporates a generalized Brinkman-Darcy formulation for the porous layers while considering the motion of nanoparticles influenced by both Brownian diffusion and thermophoresis effects.

Design/methodology/approach

The similarity transformations derived through Lie group analysis are used to reduce the system from nonlinear partial differential equations to nonlinear ordinary differential equations. The finite difference method-based numerical routine bvp4c is employed to collect and graphically present the outcomes for velocity, temperature, and nanoparticle concentration profiles. The flow pattern is analyzed through streamlined plots. Furthermore, skin friction, heat, and mass transmission rates are investigated and presented via line plots.

Findings

It is observed that in anisotropic porous media, the temperature profile is stronger than in isotropic porous media. The thermal anisotropic parameter enhances the concentration profile while reducing the temperature.

Practical implications

Anisotropy arises in various industrial and natural systems due to factors such as preferred orientation or asymmetric geometry of fibers or grains. Hence, this study has applications in oil extraction processes, certain fibrous and biological materials, geological formations, and dendritic zones formed during the solidification of binary alloys.

Originality/value

1. The permeability and thermal conductivity are not constant; instead, they have different values in the x and y directions. 2. This study considers the dependency of thermophoresis on nanoparticle volume fraction and Brownian diffusion on the temperature in both the fluid flow equations and boundary conditions. 3. A novel similarity transformation is derived using Lie group analysis instead of using an existing transformation already available in the literature.

Details

Multidiscipline Modeling in Materials and Structures, vol. 20 no. 4
Type: Research Article
ISSN: 1573-6105

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Article
Publication date: 1 July 2020

Ankita Bisht and Rajesh Sharma

The main purpose of this study is to present a non-similar analysis of two-dimensional boundary layer flow of non-Newtonian nanofluid over a vertical stretching sheet with…

186

Abstract

Purpose

The main purpose of this study is to present a non-similar analysis of two-dimensional boundary layer flow of non-Newtonian nanofluid over a vertical stretching sheet with variable thermal conductivity. The Sisko fluid model is used for non-Newtonian fluid with an exponent (n* > 1), that is, shear thickening fluid. Buongiorno model for nanofluid accounting Brownian diffusion and thermophoresis effects is used to model the governing differential equations.

Design/methodology/approach

The governing boundary layer equations are converted into nondimensional coupled nonlinear partial differential equations using appropriate transformations. The resultant differential equations are solved numerically using implicit finite difference scheme in association with the quasilinearization technique.

Findings

This analysis shows that the temperature raises for thermal conductivity parameter and velocity ratio parameter while decreases for the thermal buoyancy parameter. The thermophoresis and Brownian diffusion parameter that characterizes the nanofluid flow enhances the temperature and reduces the heat transfer rate. Skin friction drag can be effectively reduced by proper control of the values of thermal buoyancy and velocity ratio parameter.

Practical implications

The wall heating and cooling investigation result in the analysis of the control parameters that are related to the designing and manufacturing of thermal systems for cooling applications and energy harvesting. These control parameters have practical significance in the designing of heat exchangers and solar thermal collectors, in glass and polymer industries, in the extrusion of plastic sheets, the process of cooling of the metallic plate, etc.

Originality/value

To the best of authors’ knowledge, it is found from the literature survey that no similar work has been published which investigates the non-similar solution of Sisko nanofluid with variable thermal conductivity using finite difference method and quasilinearization technique.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 31 no. 1
Type: Research Article
ISSN: 0961-5539

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Article
Publication date: 20 December 2019

Ankita Bisht and Rajesh Sharma

The purpose of this study is to provide a numerical investigation of Casson nanofluid along a vertical nonlinear stretching sheet with variable thermal conductivity and viscosity.

235

Abstract

Purpose

The purpose of this study is to provide a numerical investigation of Casson nanofluid along a vertical nonlinear stretching sheet with variable thermal conductivity and viscosity.

Design/methodology/approach

The boundary-layer equations are presented in the dimensionless form using proper non-similar transformations. The subsequent non-dimensional nonlinear partial differential equations are solved using the implicit finite difference technique. To linearize the nonlinear terms present in these equations, the quasilinearization technique is used.

Findings

The investigation showed graphically the temperature, velocity and nanoparticle volume fraction for particular included physical parameters. It is observed that the velocity profile decreases with an increase in the values of Casson fluid parameter while increases with an increase in the viscosity variation parameter. The temperature profile enhances for large values of velocity variation parameter and thermal conductivity parameter while it reduces for large values of thermal buoyancy parameter. Further, the Nusselt number and skin-friction coefficient are introduced which are helpful in determining the physical aspects of Casson nanofluid flow.

Practical implications

The immediate control of heat transfer in the industrial system is crucial because of increasing energy prices. Recently, nanotechnology is proposed to control the heat transfer phenomenon. Ongoing research in complex nanofluid has been fruitful in various applications such as solar thermal collectors, nuclear reactors, electronic equipment and diesel–electric conductor. A reasonable amount of nanoparticle when added to the base fluid in solar thermal collectors serves to deeper absorption of incident radiation, and hence it upgrades the efficiency of the solar thermal collectors.

Originality/value

The non-similar solution of Casson nanofluid due to a vertical nonlinear stretching sheet with variable viscosity and thermal conductivity is discussed in this work.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 30 no. 8
Type: Research Article
ISSN: 0961-5539

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Article
Publication date: 23 December 2022

Ankita Das and Debabrata Das

The paper intends to comprehend the pattern of usage of FinTech services among bank customers during the COVID-19 pandemic. The paper also examines the factors influencing the…

891

Abstract

Purpose

The paper intends to comprehend the pattern of usage of FinTech services among bank customers during the COVID-19 pandemic. The paper also examines the factors influencing the adoption of FinTech services by using the constructs from the technology acceptance model (TAM) together with highlighting the issues faced in using FinTech services in Assam.

Design/methodology/approach

The research is empirical in nature. Data have been collected from 1,066 prime earners of the households having a bank account.

Findings

There has been an upsurge in the use of FinTech services in the area of study. Apart from government and private service employees, businessmen, self-employed professionals, many daily-wage earners and agriculturists have also experienced an increase in their frequency of usage of FinTech services thereby making technology-based financial services an indispensable tool in enhancing access, improving inclusivity in the times of crisis and aftermath. Government support, trust, perceived usefulness (PU), attitude and social influence have a positive influence on FinTech adoption; however, perceived risks impact respondents’ trust towards FinTech services thereby requiring necessary measures to evaluate organizations’ preparedness to deal with cyber threats.

Originality/value

The paper provides insight into the factors impacting the adoption of FinTech services to stimulate superior connectivity infrastructure, robust security measures and maintaining financial stability with adequate supervisory and monitoring regulations to enhance trust towards FinTech services during the crisis and aftermath.

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Article
Publication date: 31 January 2022

Piyali Ghosh, Geetika Goel and Ankita Bhongade

Market-driven skill development initiatives are essential in India as a large segment of its educated workforce is unemployed or unemployable, with little or no job skills. The…

281

Abstract

Purpose

Market-driven skill development initiatives are essential in India as a large segment of its educated workforce is unemployed or unemployable, with little or no job skills. The “Skill India Mission” aims at endowing the youth with skills that can increase their employability and productivity in jobs. The success of the Mission depends on State-level initiatives in tandem with the Mission. This paper analyzes the impact of job offers extended to the youth of Jharkhand State as an outcome of State-level skill development initiatives. Its broad objective is to assist the Government in the delivery of skill-based training programs.

Design/methodology/approach

Data were collected through a structured questionnaire administered across various districts of Jharkhand to capture the perceptions of trainees and training centers. The final sample of 498 had attended training in apparel, retail, security, automotive, food and beverage service, IT/ITES, electronics and construction.

Findings

Statistical analysis reveals a significant increase in the economic status of trainees after joining jobs. Other findings include apathy toward migration, a mismatch between skills gained and jobs, and a dearth of qualified trainers.

Practical implications

The authors recommend counseling and attitudinal restructuring of the youth, designing multi-skill training programs and promoting entrepreneurial spirit. The authors also propose a stakeholder-based approach for curriculum development to fill the demand–supply gap of training and ensure better trainee retention. The Government could benefit by focusing the skilling programs on the career adaptability of trainees. Skill development and vocational education and training may not operate in silos. Training programs could be planned to be conducted jointly through ITIs and State-level training institutions under the Skill India Mission.

Originality/value

This research could increase the effectiveness of skill development initiatives across India, thereby improving the socioeconomic status of the youth thus trained. The authors emphasize developing a people-centric perspective in skilling, shifting attention from the existing industry-driven approach, to strike a balance between the demand and supply sides. This perspective can optimize skill development initiatives by reducing the gap between employment demand and skill development.

Details

Benchmarking: An International Journal, vol. 29 no. 10
Type: Research Article
ISSN: 1463-5771

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