Search results
1 – 10 of 66Meenakumari Ramamoorthy and Lakshminarayana Pallavarapu
The present work explores the influence of Hall and Ohmic heating effects on the convective peristaltic flow of a conducting Jeffrey nanofluid in an inclined porous asymmetric…
Abstract
Purpose
The present work explores the influence of Hall and Ohmic heating effects on the convective peristaltic flow of a conducting Jeffrey nanofluid in an inclined porous asymmetric channel with slip. Also, the authors investigated the impact of viscous dissipation, thermal radiation, heat generation/absorption and cross diffusion effects on the flow. Peristaltic flow has many industrial and physiological applications and most of the biofluids show the non-Newtonian fluid behaviour. Further, in a living body, several biofluids flow through different kinds of systems that are not symmetric, horizontal or vertical. The purpose of this paper is to address these issues.
Design/methodology/approach
The authors considered the flow of Jeffrey fluid which is generated by a sinusoidal wave propagating on the walls of an inclined asymmetric channel. The flow model is developed from the fixed frame to the wave frame. Finally, yield the nonlinear governing equations by applying the non-dimensional quantities with the assumptions of lengthy wave and negligible Reynolds number. The exact solution has been computed for the velocity and pressure gradient. The solutions for temperature and concentration are obtained by the regular perturbation technique.
Findings
Graphical analysis is made for the present results for different values of emerging parameters and explained clearly. It is noticed that the magnetic field enriches the temperature where it drops the fluid velocity. This work describes that the temperature field is decreasing due to the radiation but it is a rising function of temperature slip parameter. The temperature profile declines for growing values of the Hall parameter. The flow velocity diminishes for boosting values of the Darcy parameter. Further, the authors perceived that the concentration field reduces for large values of the chemical reaction parameter.
Originality/value
The authors validated and compared the results with the existing literature. This investigation will help to study some physiological systems, and heat transfer in peristaltic transport plays key role in medical treatments, so we ensure that these results are applicable in medical treatments like cancer therapy, drug delivery, etc.
Details
Keywords
V.P. Sriram, M.A. Sikandar, Eti Khatri, Somya Choubey, Ity Patni, Lakshminarayana K. and Kamal Gulati
The young population of the globe is defined by individuals aged 15 to 24 years. Based on statistics from the Instituto Brasileiro de Geografia e Estatística (IBGE), the second…
Abstract
Purpose
The young population of the globe is defined by individuals aged 15 to 24 years. Based on statistics from the Instituto Brasileiro de Geografia e Estatística (IBGE), the second largest women population among 15 years as well as 19 years was in 2017 only behind 35 and 39 years. At this time, the Brazilian male population was higher. The difficulties of the young generation affected the preceding generation and promoted social dynamism. The worldwide data shows that the generation of young and the digital world have been constantly sought, but in reality, approximately one-third of the population in 2017 had no access to the internet.
Design/methodology/approach
The worldwide movement around topics such as strategy on its threefold basis and Industry 4.0 enable a link to company duty towards society to be established. This present study was produced from 1 March 2020 to 2 September 2020 via resources of human and literature evaluation relating to the idea of strategic, Industry 4.0, the responsibility of society and the creation of youth. Its motive is the global creation of youth. Two recommendations should be made after studying the literature and information gathering that enabled “analyzing social responsibility of the company and industry 4.0 with a pivot on young creation: a strategic framework for resources of human management”.
Findings
The adoption of defensible practices and technology bring forth by the revolution in industrial is emphasized worldwide.
Originality/value
The focus on the usage of these ideas is essential, so that young people can absorb the workforce in the labour market. To achieve this, the CSR idea combines this theoretical triple-created recent study.
Details
Keywords
R. Meenakumari, P. Lakshminarayana and K. Vajravelu
The aim of the present paper is to investigate the homogeneous and heterogeneous reactions on Prandtl fluid flow at a stretching sheet with an induced magnetic field and slip…
Abstract
Purpose
The aim of the present paper is to investigate the homogeneous and heterogeneous reactions on Prandtl fluid flow at a stretching sheet with an induced magnetic field and slip boundary conditions.
Design/methodology/approach
The governing equations include the continuity, induced magnetic field, momentum, energy and homogeneous–heterogeneous equations. Initially, with suitable similarity variables, the governing partial differential equations and converted into a system of ordinary differential equations. Then, the nonlinear ordinary differential equations are solved by a shooting technique with the help of the BVC5C Matlab package.
Findings
The results of the present investigation are presented through graphs for different values of the various parameters. The authors observed that the large values of the stretching ratio and the induced magnetic parameters are moderate magnetic field, velocity and temperature primarily. Also, the authors found the more velocity and temperatures by boosting the slip parameters.
Originality/value
In addition, the values of the skin friction and the rate of heat transfer for various values of physical parameters are tabulated and deliberated in detail.
Details
Keywords
Jagadesh Vardagala, Sreenadh Sreedharamalle, Ajithkumar Moorthi, Sucharitha Gorintla and Lakshminarayana Pallavarapu
Ohmic heating generates temperature with the help of electrical current and resists the flow of electricity. Also, it generates heat rapidly and uniformly in the liquid matrix…
Abstract
Purpose
Ohmic heating generates temperature with the help of electrical current and resists the flow of electricity. Also, it generates heat rapidly and uniformly in the liquid matrix. Electrically conducting biofluid flows with Ohmic heating have many biomedical and industrial applications. The purpose of this study is to provide the significance of the effects of Ohmic heating and viscous dissipation on electrically conducting Casson nanofluid flow driven by peristaltic pumping through a vertical porous channel.
Design/methodology/approach
In this analysis, the non-Newtonian properties of fluid will be characterized by the Casson fluid model. The long wavelength approach reduces the complexity of the governing system of coupled partial differential equations with non-linear components. Using a regular perturbation approach, the solutions for the flow quantities are established. The fascinating and essential characteristics of flow parameters such as the thermal Grashof number, nanoparticle Grashof number, magnetic parameter, Brinkmann number, permeability parameter, Reynolds number, Casson fluid parameter, thermophoresis parameter and Brownian movement parameter on the convective peristaltic pumping are presented and thoroughly addressed. Furthermore, the phenomenon of trapping is illustrated visually.
Findings
The findings indicate that intensifying the permeability and Casson fluid parameters boosts the temperature distribution. It is observed that the velocity profile is elevated by enhancing the thermal Grashof number and perturbation parameter, whereas it reduces as a function of the magnetic parameter and Reynolds number. Moreover, trapped bolus size upsurges for greater values of nanoparticle Grashof number and magnetic parameter.
Originality/value
There are some interesting studies in the literature to explain the nature of the peristaltic flow of non-Newtonian nanofluids under various assumptions. It is observed that there is no study in the literature as investigated in this paper.
Details
Keywords
Ilango M.S. and Lakshminarayana Pallavarapu
The purpose of this study is to examine the melting heat transfer of magnetohydrodynamics Casson nanofluid flow with viscous dissipation, radiation, and complete slip effects on a…
Abstract
Purpose
The purpose of this study is to examine the melting heat transfer of magnetohydrodynamics Casson nanofluid flow with viscous dissipation, radiation, and complete slip effects on a porous stretching sheet. Since, the study of melting heat transfer has mesmerized the attention of scientists and engineers in the sense of its enormous uses in industrial processes, solidification, casting, and technology.
Design/methodology/approach
Bejan number and entropy are analyzed. Exploration of irreversibility is modeled using the thermodynamics second law. There is a discussion on thermophoresis and Brownian diffusion along with first-order chemical reactions. Adequate transformations are introduced to convert the controlling partial differential equations to ordinary differential equations. The three-phase Lobatto solvers (bvp5c) are used to obtain numerical solutions of the transmitted equations.
Findings
The effects of various factors on temperature, velocity, concentration, Bejan number and entropy rate are shown graphically. The velocity field is enhanced by increasing the melting heat parameter, and it declines for growing magnetic parameters. Temperature is decreased for increasing parametric values of melting heat, porous and Casson parameters. A 7% decrease in the Sherwood distribution is seen when we increase the Brownian motion parameter from 0.1 to 0.2. Similarly, an 11% decrement is found in the Nusselt distribution for increasing the Brinkman number from 0.5 to 1.
Originality/value
Entropy and Bejan number experience dual tendencies whenever the melting heat parameter increases. Nusselt number and skin friction experience the opposite behavior for the increasing values of melting parameter. Sherwood number decreases for the increasing values of melting parameter. The velocity profile is directly related to the melting parameter and inversely related to porous and magnetic parameters. Thermophoresis and Brinkman parameters boost the temperature profile and it is controlled by melting and porous parameters. Some notable fields where the present study is used inevitably are silicon wafering, geothermal energy recovery and semiconductor manufacturing.
Details
Keywords
C. B. Mohan, K. Venkatesh, C. Divakar, K. Gopalakrishna, L. Murali and K. G. Lakshminarayana Bhatta
The paper aims to address the formulation of zirconium and oxalicum additive-based lubricants for use in slide ways to meet the demands of high positioning exactness based on…
Abstract
Purpose
The paper aims to address the formulation of zirconium and oxalicum additive-based lubricants for use in slide ways to meet the demands of high positioning exactness based on reduction in stick–slip and coefficient of friction over a wide speed range and compares the same with commercially available lubricant.
Design/methodology/approach
An investigation into the frictional properties and stick-slip behavior of lubricating oil is carried out using linear reciprocating tribometer and correlated with ultraviolet spectroscopic analysis.
Findings
It is observed that these transition metal additive compounds support in increasing the flexibility of the molecular chains leading to improved lubricity.
Originality/value
The lubricant additives considered for the current study are based on transition metals zirconium and oxalicum. It is observed that these additive compounds support in increasing the flexibility of the molecular chains, leading to improved lubricity.
Details
Keywords
K. Ramesh and M. Devakar
The main purpose of this paper is to study the effect of heat transfer on the peristaltic flow of a magnetohydrodynamic Walters B fluid through a porous medium in an inclined…
Abstract
Purpose
The main purpose of this paper is to study the effect of heat transfer on the peristaltic flow of a magnetohydrodynamic Walters B fluid through a porous medium in an inclined asymmetric channel.
Design/methodology/approach
The approximate analytical solutions of the governing partial differential equations are obtained using the regular perturbation method by taking wave number as a small parameter. The solutions for the pressure difference and friction forces are evaluated using numerical integration.
Findings
It is noticed that the pressure gradient and pressure difference are increasing functions of inclination angle and Grashof number. The temperature and heat transfer coefficients both increase with increase in inclination angle, Darcy number, Grashof number and Prandtl number. Increase in Hartmann number and phase difference decreases the size of trapped bolus.
Originality/value
The problem is original, as no work has been reported on the effect of magnetohydrodynamics on the peristaltic flow of a Walters B fluid through a porous medium in an inclined asymmetric channel with heat transfer.
Details
Keywords
Manjunatha Gudekote, Rajashekhar Choudhari, Hanumesh Vaidya, Prasad K.V. and Viharika J.U.
The purpose of this paper is to emphasize the peristaltic mechanism of power-law fluid in an elastic porous tube under the influence of slip and convective conditions. The effects…
Abstract
Purpose
The purpose of this paper is to emphasize the peristaltic mechanism of power-law fluid in an elastic porous tube under the influence of slip and convective conditions. The effects of different waveforms on the peristaltic mechanism are taken into account.
Design/methodology/approach
The governing equations are rendered dimensionless using the suitable similarity transformations. The analytical solutions are obtained by using the long wavelength and small Reynold’s number approximations. The expressions for velocity, flow rate, temperature and streamlines are obtained and analyzed graphically. Furthermore, an application to flow through an artery is determined by using a tensile expression given by Rubinow and Keller.
Findings
The principal findings from the present model are as follows. The axial velocity increases with an expansion in the estimation of velocity slip parameter and fluid behavior index, and it diminishes for a larger value of the porous parameter. The magnitude of temperature diminishes with an expansion in the Biot number. The flux is maximum for trapezoidal wave and minimum for the triangular wave when compared with other considered waveforms. The flow rate in an elastic tube increases with an expansion in the porous parameter, and it diminishes with an increment in the slip parameter. The volume of tapered bolus enhances with increasing values of the porous parameter.
Originality/value
The current study finds the application in designing the heart-lung machine and dialysis machine. The investigation further gives a superior comprehension of the peristaltic system associated with the gastrointestinal tract and the stream of blood in small or microvessels.
Details
Keywords
Entrepreneurship, Strategic Management, Social Sector.
Abstract
Subject area
Entrepreneurship, Strategic Management, Social Sector.
Study level/applicability
The case can be used in undergraduate, graduate and executive education courses in entrepreneurship and strategic management. It is a perfect fit for executive sessions at incubation centers for not-for-profit (NPO) start-up social enterprises. The case is aimed at early-phase social entrepreneurs and those interested in the field.
Case overview
Anthill Creations (hereafter referred to as Anthill) is a NPO organization engaged in building low-cost sustainable playscapes for underprivileged children. Their mission is to “Bring Back play” in the lives of millions of children of marginalized communities by building sustainable playscapes. It is an effort that contributes toward the objectives of clause 1.2 (Ministry of Human Resource Development, Government of India, 2020), on “Early Childhood Care and Education” (ECCE) in the new National Education Policy (NEP) 2020 of India as released on July 30, 2020. The ECCE clause emphasizes the importance of “learning through play”; and recognizes it to be central to quality early childhood pedagogy and education. Anthill has been working on the same philosophy since its inception in 2016. They have successfully built 300 playscapes across 18 states of the country and impacted the lives of more than 200,000 children. The playscapes are built using upcycled waste material, such as scrap tires, waste cable and oil drums; further, they use local resources and contextual designs and built them by mobilizing community participation. The playscape play elements provide for unstructured free play for children and encourage them to use their imagination to invent new games.
Pooja Rai – the founder and CEO of Anthill Creations, an architect by discipline started the NPO immediately after her graduation. It was her “calling” in life that pushed her to quit a corporate job in the early stages of her career and instead pursue a career in the social sector. The case details her methodical approach in pursuing her intuitive response to a social need, the way she adopts a lean start-up framework to set-up Anthill, her frustrations, personal resilience and ability to balance different stakeholder interests as she treads the difficult journey of building the awareness of inculcating play as a pedagogy in the early years of childhood development.
The case provides data on the large proportion of the marginalized population in India and the abysmal conditions of the Indian Government schools. The objectives of clause 1.2 on ECCE in NEP 2020 show the Indian Government’s good intent. And yet with the prevailing conditions, the policy’s ambitious target of universalization of ECCE by 2030 (Chanda, 2020), seems a mammoth task, even for the Indian Government.
On the other hand, Anthill as a small NPO of young dedicated individuals is invested and experimental in their approach; they have a tested model but financial dependency limits their activities. The ECCE clause is a sign of new hope for NPOs such as Anthill who want to reach out to millions of Indian children from marginalized communities. What could be a compatible, perhaps complementary or even skillful pathway to integrate Anthill’s tested model of building sustainable playscapes with the Indian Government’s good intentions of universalization of ECCE by 2030? How could Anthill “scale” for a systemic “impact”? Should not the NPOs, early childhood development researchers, funders and government authorities study collaboratively instead of the present siloed approach so as to bring about a systemic change in the thinking lenses about “play” to be an integral part of early childhood development? Rai ponders on the above questions.
Expected learning outcomes
To explain the importance of one’s purpose (calling) in life and how the authors can identify with it.
To explain how an intuitive response to social need can be complemented with a methodical approach to social entrepreneurship.
To discuss the importance of business model canvas from the social sector lens.
To explain the important elements in sustaining small start-up social organizations.
To discuss and evaluate the options an early-stage social enterprise can engage into “scale” for “impact.”
Supplementary materials
Teaching notes are available for educators only.
Subject code
CSS 3: Entrepreneurship.
Details
Keywords
Sara I. Abdelsalam, A. Magesh, P. Tamizharasi and A.Z. Zaher
The purpose of this paper is to investigate the behavior of a non-Newtonian nanofluid caused by peristaltic waves along an asymmetric channel. Additionally considered is the…
Abstract
Purpose
The purpose of this paper is to investigate the behavior of a non-Newtonian nanofluid caused by peristaltic waves along an asymmetric channel. Additionally considered is the production of thermal radiation and activation energy.
Design/methodology/approach
The equations of momentum, mass and temperature of Sutterby nanofluids are obtained for long wavelength. By taking into account the velocity, temperature and concentration, the formulation is further finished.
Findings
Analyses of the physical variables influencing flow features are represented graphically. The present investigation shows that an enhancement in the temperature ratio parameter results in an increase in both the temperature and concentration. The investigation also shows that the dimensionless reaction rate significantly raises the kinetic energy of the reactant, which permits more particle collisions and as a result, raises the temperature field.
Originality/value
Due to their importance in the treatment of cancer, activation energy and thermal radiation as a route of heat transfer are crucial and exciting phenomena for researchers. So, the cancer cells are killed, and tumors are reduced in size with heat and making hyperthermia therapy a cutting-edge cancer treatment.
Details