Vinay C.A. and Kumar G.N.
Development or upgradation of airplanes requires many different analyses, e.g. thermal, aerodynamic, structural and safety. Similar studies were performed during configuration…
Abstract
Purpose
Development or upgradation of airplanes requires many different analyses, e.g. thermal, aerodynamic, structural and safety. Similar studies were performed during configuration change design of commuter category aircraft equipped with pusher turboprop engines. In this paper, thermo-fluid analyses of interactions of the new propulsion system in tractor configuration with selected elements of airplane skin are carried out. This study aims to check the airplane skin material, and its geometry, including the Plexiglas passenger window material degradation, due to hot exhaust gas plume impingement. The impact of change in exhaust stub angle and asymmetric inboard-outboard stubs on the jet thrust at various flight operating conditions like minimum off-route altitude and cruise performance is assessed.
Design/methodology/approach
Commercial software-based numerical models were developed. In the first stage, heat and fluid flow analysis was performed over a twin-engine airplane’s nacelle, wing and center fuselage with its powerplant mounted in the high wing configuration. Subsequently, numerical simulations of thermal interactions between the hot exhaust gases, which leave the exhaust system close to the nacelle, flaps and the center fuselage, were estimated for various combinations of exhaust stub angles with asymmetry between inboard-outboard stubs at different airplane configurations and operating conditions.
Findings
The results of the simulations are used to recommend modifications to the design of the considered airplane in terms of material selection and/or special coatings. The importance and impact of exhaust jet thrust on the overall aircraft performance are investigated.
Originality/value
The advanced numerical model for the exhaust jet-airplane skin thermal interaction was developed to estimate the temperature effects on the propeller blades and aircraft fuselage surfaces during different flight operating conditions with multiple combinations of stub orientations.
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Rubee Singh, Akash Gupta, Arushi Bajpai and Vinay Kandpal
This chapter critically discusses the literature on the subject of circular economy. It defines the circular economy at the outset and advocates its adoption in smart cities. It…
Abstract
This chapter critically discusses the literature on the subject of circular economy. It defines the circular economy at the outset and advocates its adoption in smart cities. It briefly explains the multiple phases of industrial revolution and the slow and gradual shift from a linear economy which is based on make-use-dispose model to a circular economy which relies on reusing and recycling the products produced in the production cycle. It then critically examines the legal challenges that can be associated with such a system. It draws on the lessons learnt from cities such as Amsterdam which has successfully implemented the system of circular economy. This chapter also delves into the Columbian waste management system to understand the market functioning in the waste management sector which is handled by private enterprises in the country. Moreover, the public–private partnership model in the Chinese city Suzhou is explored, and exciting methods of using this model were found.
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Shalini M. Patil, C.V. Vinay and Dinesh P.A.
The purpose of this paper is to study the amalgamated consequences of nonNewtonian fluid and permeability for nonporous journal spinning with constant tangential velocity inside a…
Abstract
Purpose
The purpose of this paper is to study the amalgamated consequences of nonNewtonian fluid and permeability for nonporous journal spinning with constant tangential velocity inside a rough porous bearing.
Design/methodology/approach
The flow is assumed to have developed under low Reynolds number, and the flow is governed by reduced Navier–Stokes equations. Based on Stokes theory for couple-stress fluid, a closed form of nonNewtonian Reynolds equation is obtained. Finite difference based multigrid method is adopted to study the various parameters of journal bearings.
Findings
It is found that bearing attributes such as pressure distribution and weight carrying capacity are commanding for nonNewtonian couple-stress fluid compared to the classical Newtonian case.
Originality/value
The multigrid method for the Reynolds equation is used, which accelerates the convergence rate of the solution and is independent of the grid size. The effects of couple-stress fluid promote the enhanced pressure distribution in the fluid. Both increased weight bearing capacity and delayed squeezing time reduce the skin-friction and hence take longer time to come in contact with each other.
Peer review
The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-02-2020-0051/
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Premkumar P.S., Nadaraja Pillai S. and Senthil Kumar C.
Pusher configured turbo-prop aircraft receive inadequate ram air cooling due to the lack of propeller slipstream, particularly during ground operations. However, flow entrainment…
Abstract
Purpose
Pusher configured turbo-prop aircraft receive inadequate ram air cooling due to the lack of propeller slipstream, particularly during ground operations. However, flow entrainment can be exploited to a greater extent by placing the oil-cooler duct close to downstream of the propeller at a suitable radial location. But this method has a detrimental effect on the propeller thrust. The purpose of this paper is to discuss the results of numerical simulations carried out to simulate the performance of the propeller with and without oil cooler.
Design/methodology/approach
In this paper, three-dimensional (3D) numerical simulations are carried out to simulate the propeller in a rotating domain using an unstructured grid. A computational fluid dynamics solver is put forward to analyze the effect of thrust loss by solving 3D Navier-Stokes equations using a second-order upwind finite-volume scheme. In this study, the impact of thrust loss incurred in the propeller flow field with and without oil cooler duct for three different locations at various rotational speeds is carried out to assess the propeller performance and to identify the optimum position to get a sufficient mass flow rate.
Findings
The findings from this study are simulated thrust values of an uninstalled five-bladed propeller of light transport aircraft (LTA) match well with original equipment manufacturer propeller thrust data. The tip speed velocities simulated for different operating conditions are in good agreement with the theoretical calculations. The influence of oil-cooler effect on the propeller flow field is less in low velocity to high-velocity operating condition due to flow transition from laminar to turbulent. The presence of the oil cooler, which influences the thrust loss, is studied at propeller upstream and downstream locations in detail for 30%, 40% and 50% of propeller radius cases.
Research limitations/implications
Simulations with finer and structured hexa grids can be applied to this problem to get closer results and save solver time as future work.
Practical implications
The recommended system is installed in the production standard aircraft of LTA. After installation oil cooler performance is better compared to the previous arrangement.
Originality/value
Research work about pusher aircraft is very limited. The problem addressed in this study is unique which resolves the major issue of pusher aircraft. This work highlights the difficulty involved in LTA engine oil cooling, and solution methodologies are also provided. Numerical simulation with oil-cooler assembly is a new area of research that gave the solution for this oil-cooling issue through various oil-cooler case studies.
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The length of the debate regarding a new business idea and resource allocation between Ritu Jhajharia, Vinay Chaurasia and Sandeep Poonia on an evening in March 2016, was enough…
Abstract
The length of the debate regarding a new business idea and resource allocation between Ritu Jhajharia, Vinay Chaurasia and Sandeep Poonia on an evening in March 2016, was enough to make the piping hot pasta go cold. After much deliberation, The Rolling Circle, a Mumbai-based marketing firm concentrated on the digital marketing business arena was born with plans of potentially viable business strategies, blueprints of employee and other key resources' allocations, strategies for client procurement and vesting of some amount of investment money in initial pitches. Yet, in the last two plus years, the company has procured 40 plus clients and are looking to finish their account books with Rs. 1 crore revenue in their banks by 2018. Despite initial financial crunch, the company continued to get businesses. One day in February 2018, the resignation of co-founder Vinay Chaurasia was a blow to the foundation of the company. While clocking their best business so far and continuously growing since its inception, The Rolling Circle is now faced with one of the biggest dilemmas in the company lifecycle: in their line of business, there is neither a constant flow of clients nor a stability in terms of the employees working in the organisation; the founding team is grappling with the glaring strategic question of whether they should recruit high-profile employees in the organisation first and then continue onboarding premium clients, or they should first sign with premium clients and then look out for high-profile employees to serve those clients? Who will wait: the client or the employees?
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Manoj Joshi and Apoorva Srivastava
Start-ups, entrepreneurship, innovation and innovative practices, risks, uncertainties, differentiation, internationalization, competition, business models, operationalizing and…
Abstract
Subject area
Start-ups, entrepreneurship, innovation and innovative practices, risks, uncertainties, differentiation, internationalization, competition, business models, operationalizing and implementing strategy.
Study level/applicability
The case is suitable for MBA students.
Case overview
Vinay moved to the capital city of a Northern Indian state, which also happened to be a commercial hub, after his family business failed. The family succumbed to living in a room without electricity and doors. Vinay had dreamt of establishing his own business empire by being a successful entrepreneur. Steered by this intent, he established a pharmaceutical company with the name of Ayuvayur Pharmaceuticals. The challenge was to establish an innovative Ayurveda-based pharmaceutical products-based firm and to build a leading business empire with a customer focus. Progress was not smooth and the challenges ahead multiplied. Despite his ability to cope with barriers, risks and uncertainties, Vinay and his business, was challenged to grow globally and emerge from its nascent structure. How should the business expand?
Expected learning outcomes
Students can discover the following key learning points: how an enterprise is born; the importance of entrepreneurial recognition and orientation; the lead characteristics of an entrepreneur; how a start-up is born despite the unfamiliarity of the entrepreneur with the field he enters; the role of innovation in a small enterprise; and the risks, barriers, uncertainties and challenges associated with entrepreneurial activity.
Supplementary materials
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Vinay Surendra Yadav, Sarsij Tripathi and A.R. Singh
The purpose of this paper is to design a sustainable supply chain network (SCN) for omnichannel environment in order to provide better service to customers through flexible…
Abstract
Purpose
The purpose of this paper is to design a sustainable supply chain network (SCN) for omnichannel environment in order to provide better service to customers through flexible distribution. Thus, there is a need to incorporate multiple-channel distribution in the network design of supply chains (SCs).
Design/methodology/approach
A multiple-channel distribution supply chain network (MCDSCN) has been proposed under omnichannel environment. This proposed model integrates online giants with local retailer’s distribution network in an uncertain environment with sustainability. To incorporate sustainability, an objective function is added to reduce carbon content along with other objectives of minimization of SC cost. The model turns out to be mixed-integer linear programming model which is coded in GAMS and solved using CPLEX solver.
Findings
The proposed MCDSCN model is compared with conventional SCN. Furthermore, it was found that the proposed MCDSCN model has achieved significant saving in SC cost and is also more sustainable than conventional SCN. The proposed model also enables online giants to integrate their distribution network with local retailer’s distribution network.
Practical implications
Through proposed model, customers are free to access product and services as per their choice of channels which increases their convenience, reach and satisfaction.
Originality/value
The proposed MCDSCN model is a novel approach to design flexible distribution systems. This would significantly help organizations to design their distribution network more effectively to meet global competition.
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Shikha Singh, Mohina Gandhi, Arpan Kumar Kar and Vinay Anand Tikkiwal
This study evaluates the effect of the media image content of business to business (B2B) organizations to accelerate social media engagement. It highlights the importance of…
Abstract
Purpose
This study evaluates the effect of the media image content of business to business (B2B) organizations to accelerate social media engagement. It highlights the importance of strategically designing image content for business marketing strategies.
Design/methodology/approach
This study designed a computation extensive research model based upon the stimulus-organism-response (SOR) theory using 39,139 Facebook posts of 125 organizations selected from Fortune 500 firms. Attributes from images and text were estimated using deep learning models. Subsequently, inferential analysis was established with ordinary least squares regression. Further machine learning algorithms, like support vector regression, k-nearest neighbour, decision tree and random forest, are used to analyze the significance and robustness of the proposed model for predicting engagement metrics.
Findings
The results indicate that the social media (SM) image content of B2B firms significantly impacts their social media engagement. The visual and linguistic attributes are extracted from the image using deep learning. The distinctive effect of each feature on social media engagement (SME) is empirically verified in this study.
Originality/value
This research presents practical insights formulated by embedding marketing, advertising, image processing and statistical knowledge of SM analytics. The findings of this study provide evidence for the stimulating effect of image content concerning SME. Based on the theoretical implications of this study, marketing and media content practitioners can enhance the efficacy of SM posts in engaging users.
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Vinay Gadi, Shivam Singh, Manish Singhariya, Ankit Garg, Sreedeep S. and Ravi K.
The purpose of this paper is to numerically investigate the combined effects of canopy (leaf area index [LAI]) and root properties (root distribution function [Rdf] and root area…
Abstract
Purpose
The purpose of this paper is to numerically investigate the combined effects of canopy (leaf area index [LAI]) and root properties (root distribution function [Rdf] and root area index [RAI]) on a suction induced in soil-root composite under three different scenarios.
Design/methodology/approach
Richards equation coupled with sink term was solved using a commercial finite element package “HYDRUS” to investigate suction induced in soil-root composite.
Findings
Scenario 1 unveiled that soil-root composite induces 1 to 20 per cent higher suction than bare soil under the absence of transpiration. From Scenario 2, value of suction at depth of maximum RAI in case of linearly decreasing Rdf was found to be higher than that of other Rdfs. However, depth of suction influence zone (SIZ) for uniform Rdf and non-linear Rdf was found to be 10 and 11 per cent higher than that of linearly decreasing Rdf. Depth of evaporation dominant zone (EDZ) for uniformly decreasing Rdf and non-linear Rdf was found to be 1.08 to 3 times higher than that of linearly decreasing Rdf. From Scenario 3, influence of LAI on depth of SIZ is minimal. Depth of EDZ was found to decrease with the increase in LAI. Based on simple calculation on infinite slope stability, influence of variation in root and shoot properties was found to be significant on its factor of safety.
Research limitations/implications
Numerical constitutive model has limitations that it does not consider aging of plant. This model is only applicable for a particular set of soil conditions. A long-term study is required in this field to further quantify parameters for improving calibration and modeling performance.
Practical implications
Following are the practical implication: consideration of vegetation properties into engineered design of green infrastructure (slopes in this case) and selection of vegetation with appropriate characteristics in design for enhancement of stability of green infrastructure.
Originality/value
Contents of this paper are original, and they have not been submitted to any other journal.