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Article
Publication date: 3 November 2023

Arun G. Nair, Tide P.S. and Bhasi A.B.

The mixing of fuel and air plays a pivotal role in enhancing combustion in supersonic regime. Proper mixing stabilizes the flame and prevents blow-off. Blow-off is due to the…

Abstract

Purpose

The mixing of fuel and air plays a pivotal role in enhancing combustion in supersonic regime. Proper mixing stabilizes the flame and prevents blow-off. Blow-off is due to the shorter residence time of fuel and air in the combustor, as the flow is in supersonic regime. The flame is initiated in the local subsonic region created using a flameholder within the supersonic combustor. This study aims to design an effective flameholder which increases the residence time of fuel in the combustor allowing proper combustion preventing blow-off and other instabilities.

Design/methodology/approach

The geometry of the strut-based flameholder is altered in the present study to induce a streamwise motion of the fluid downstream of the strut. The streamwise motion of the fluid is initiated by the ramps and grooves of the strut geometry. The numerical simulations were carried out using ANSYS Fluent and are validated against the available experimental and numerical results of cold flow with hydrogen injection using plain strut as the flameholder. In the present study, numerical investigations are performed to analyse the effect on hydrogen injection in strut-based flameholders with ramps and converging grooves using Reynolds-averaged Navier–Stokes equation coupled with Menter’s shear stress transport k-ω turbulence model. The analysis is done to determine the effect of geometrical parameters and flow parameter on the flow structures near the base of the strut where thorough mixing takes place. The geometrical parameters under consideration include the ramp length, groove convergence angle, depth of the groove, groove compression angle and the Mach number. Two different strut configurations, namely, symmetric and asymmetric struts were also studied.

Findings

Higher turbulence and complex flow structures are visible in asymmetric strut configuration which develops better mixing of hydrogen and air compared to symmetric strut configuration. The variation in the geometric parameters develop changes in the fluid motion downstream of the strut. The fluid passing through the converging grooves gets decelerated thereby reducing the Mach number by 20% near the base of the strut compared to the straight grooved strut. The shorter ramps are found to be more effective, as the pressure variation in lateral direction is carried along the strut walls downstream of the strut increasing the streamwise motion of the fluid. The decrease in the depth of the groove increases the recirculation zone downstream of the strut. Moreover, the increase in the groove compression angle also increases the turbulence near the base of the strut where the fuel is injected. Variation in the injection port location increases the mixing performance of the combustor by 25%. The turbulence of the fuel jet stream is considerably changed by the increase in the injection velocity. However, the change in the flow field properties within the flow domain is marginal. The increase in fuel mass flow rate brings about considerable change in the flow field inducing stronger shock structures.

Originality/value

The present study identifies the optimum geometry of the strut-based flameholder with ramps and converging grooves. The reaction flow modelling may be performed on the strut geometry incorporating the design features obtained in the present study.

Details

Aircraft Engineering and Aerospace Technology, vol. 96 no. 1
Type: Research Article
ISSN: 1748-8842

Keywords

Book part
Publication date: 29 January 2024

Christophe Haag and Marion Wolff

Little is known about what emotionally un(intelligent) CEOs really say to their close collaborators within the boardroom. Would the rhetoric content differ between an emotionally…

Abstract

Purpose

Little is known about what emotionally un(intelligent) CEOs really say to their close collaborators within the boardroom. Would the rhetoric content differ between an emotionally intelligent and an emotionally unintelligent CEO, especially during a crisis? This chapter aims to answer this question.

Study Design/Methodology/Approach

40 CEOs of large corporations were asked to deliver a verbal address to their board members in reaction to a vignette describing a critical situation for the company. Participants were provided with the Schutte self-report emotional intelligence (EI) test. The verbal content of CEOs' closed-door discourses was analyzed using Cognitive-Discursive Analysis (CDA) and, subsequently, Geometric Data Analysis (GDA).

Findings

The results revealed that CEOs with low EI tend to evoke unpleasant emotions, talk about competition, and often blame some – or all – of the board members for their (poor) actions in comparison to CEOs with high or medium EI. In contrast, CEOs with high EI tend to use terms in relation to decision or realization and appear to be more cooperative than those with lower EI and were also ready to make decisions on behalf of team.

Originality/Value

Previous research has mainly focused on CEOs' public speeches. But the content of CEOs' speeches within the boardroom might noticeably differ from what they would say in a public address. The results of our exploratory study can serve CEOs as a basis toward improving their closed-door rhetoric during a crisis.

Research Limitations

It would be interesting to enlarge the size of our population in order to strengthen our statistical analyses as well as explore other cultural and linguistic environments and other channels through which emotions can be expressed (e.g., human face, gesture, vocal tone).

Details

Emotion in Organizations
Type: Book
ISBN: 978-1-83797-251-7

Keywords

Article
Publication date: 27 November 2023

Marie-Hélène Gilbert, Julie Dextras-Gauthier, Maude Boulet, Isabelle Auclair, Justine Dima and Frédéric Boucher

Maintaining a healthy and productive workforce is a challenge for most organizations. This is even truer for health organization, facing staff shortages and work overload. The aim…

Abstract

Purpose

Maintaining a healthy and productive workforce is a challenge for most organizations. This is even truer for health organization, facing staff shortages and work overload. The aim of this study is to identify the resources and constraints that influence managers' mental health and better understand how they are affected by them.

Design/methodology/approach

A qualitative approach was chosen to document the resources, the constraints as well as their consequences on managers in their day-to-day realities. The sample included executive-, intermediate- and first-level managers from a Canadian healthcare facility. A total of 62 semi-structured interviews were conducted. The coding process was based on the IGLOO model of Nielsen et al. (2018) to which an employee-related level was added (IGELOO).

Findings

Results highlight the importance of considering both resources as well as constraints in examining managers' mental health. Overarching context, organizational constraints and the management of difficult employees played important roles in the stress experienced by managers.

Practical implications

The results offer a better understanding of the importance of intervening at different levels to promote better organizational health. Results also highlight the importance of setting up organizational resources and act on the various constraints to reduce them. Different individual strategies used by managers to deal with the various constraints and maintain their mental health also emerge from those results.

Originality/value

In addition to addressing the reality of healthcare managers, this study supplements a theoretical model and suggests avenues for interventions promoting more sustainable organizational health.

Details

Journal of Health Organization and Management, vol. 38 no. 1
Type: Research Article
ISSN: 1477-7266

Keywords

Article
Publication date: 21 February 2024

Azzedine Tounés and Erno Tornikoski

The purpose of this study is to investigate whether business growth intention (BGI) and entrepreneurial motivations enhance the explanatory power of the theory of planned behavior…

Abstract

Purpose

The purpose of this study is to investigate whether business growth intention (BGI) and entrepreneurial motivations enhance the explanatory power of the theory of planned behavior (TPB) to predict environmental intention (EI) among nascent entrepreneurs.

Design/methodology/approach

In the context of nascent entrepreneurship, the authors collected data from 193 nascent entrepreneurs in France. To test the hypotheses, stepwise multiple regression was performed.

Findings

The results show that BGI has a positive influence on EI. This indicates that it is possible for French nascent entrepreneurs to plan the simultaneous pursuit of business growth and environmental goals. However, entrepreneurial motivations have a mixed effect on EI. If necessity motivations negatively influence EI, opportunity motivations have no significant effect on the latter.

Originality/value

To the best of the authors’ knowledge, this research is among the first to extend the TBP model with additional factors, namely, BGI and necessity/opportunity motivations, to study EI. Moreover, the extended TBP model is validated in the under-research context of nascent entrepreneurship.

Details

European Business Review, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0955-534X

Keywords

Article
Publication date: 6 February 2024

Marie Reumont, François Cooren and Claudia Déméné

Communicating a clear, precise, interpretable and unambiguous visual message usually relies on a cross-disciplinary team of professionals. Their complementary visions can uncover…

Abstract

Purpose

Communicating a clear, precise, interpretable and unambiguous visual message usually relies on a cross-disciplinary team of professionals. Their complementary visions can uncover which information matter and how it could be visually displayed to inform, sensitize and encourage people to act toward sustainability. While design studies generally claim that this team has to come to a shared vision, the authors question this assumption, which seems to contradict the benefits of cross-disciplinarity. The purpose of this study is to reveal how simple visual representations displayed in a PowerPoint actively participate in the expression of various and sometimes divergent visions. Recognizing the agency of visuals also leads this study to propose the notion of (un)shared professional vision, which shows that the richness of visual representations can only reveal itself through the capacity of professional visions to maintain their differences while confronting each other.

Design/methodology/approach

Over a 20-month ethnography, this study documented its own cross-disciplinary reflective design process, which aimed to design collectively an experimental environmental label, focusing on interactions occurring between professionals and visuals displayed on five key PowerPoint slides.

Findings

This study first demonstrates how, in practice, a cross-disciplinary reflective design conversation with visuals concretely unfolds through boundary-objects. This study shows how these visuals manage to ex-press themselves through the multiple visions represented in the discussions, revealing their complexity. Second, this study introduces the notion of (un)shared professional vision which underlines that unsharing a vision nurtures the team’s collective capacity to express the complexity of a design situation, while sharing a vision is also necessary to confront these respective expressions to allow the professional uncovering of what should be visually communicated.

Originality/value

The Communication as Constitutive of Organization lens the authors chose to understand the reflective design conversation illustrates that, even though each collaborator’s vision was “(un)shared,” their many voices expand the understanding of the situation and lead them to develop an unexpected and creative environmental information ecosystem that can positively transform society through visuals.

Details

Journal of Communication Management, vol. 28 no. 1
Type: Research Article
ISSN: 1363-254X

Keywords

Article
Publication date: 16 January 2024

Mariana Baldi, Frank G.A. de Bakker and Rodrigo Luís Melz

This study aims to analyse the strategic moves used by major tobacco corporations to thwart the ratification of the World Health Organization’s Framework Convention on Tobacco…

Abstract

Purpose

This study aims to analyse the strategic moves used by major tobacco corporations to thwart the ratification of the World Health Organization’s Framework Convention on Tobacco Control (FCTC) in Brazil.

Design/methodology/approach

The authors conducted a detailed historical case study spanning 1988–2005 and encompassing the period leading up to Brazil’s FCTC ratification. The authors collected qualitative data from various sources to triangulate and develop a comprehensive historical account.

Findings

The historical analysis identified three distinct phases. First, the acquisition of a Brazilian cigarette factory, Souza Cruz, by British American Tobacco dramatically altered power dynamics, strengthening the position of the tobacco industry. The second phase regards the era of dictatorship and the efforts of various actors advocating against smoking and the tobacco industry. The third phase involved Brazil’s re-democratisation and the challenges of securing FCTC ratification, during which fierce industry opposition had to be overcome. Throughout these phases, the authors identified four key strategies used by multinational corporations (MNCs) in Brazil to uphold unsustainable practices and products that contradicted public interests instead of reforming them: shaping collective memory, dissimulation, re-presentation and redirecting attention.

Originality/value

This study contributes to critical international business research on emerging economies by examining how Brazil’s position in the global capitalist system has influenced its dependency and how MNCs produce and maintain cycles of poverty and unsustainable practices through the exploitation of power dynamics within the country.

Details

Critical Perspectives on International Business, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1742-2043

Keywords

Article
Publication date: 15 February 2024

Chun Cheng

This study investigates the direct influence of ambidextrous leadership on employees’ innovation behaviour, the mediating role of innovative self-efficacy and harmonious work…

Abstract

Purpose

This study investigates the direct influence of ambidextrous leadership on employees’ innovation behaviour, the mediating role of innovative self-efficacy and harmonious work passion, and the moderating role of Zhong-Yong thinking.

Design/methodology/approach

The authors conducted a series of questionnaire surveys to collect data in three time periods and from multiple sources; 332 supervisor–subordinate matched samples were obtained. The hypothesised relationships were tested using structural equation modelling and ProClin.

Findings

Ambidextrous leadership is positively associated with employees’ innovation behaviour, while innovative self-efficacy and harmonious work passion play mediating roles. The analysis further confirms that innovative self-efficacy and harmonious work passion play a chained double-mediating role between ambidextrous leadership and employees’ innovation behaviour, while Zhong-Yong thinking plays moderating roles between ambidextrous leadership and innovative self-efficacy and between ambidextrous leadership and harmonious work passion.

Originality/value

This study demonstrates the influence of ambidextrous leadership on employees’ innovation behaviour, specifically the role of ambidextrous leadership, and extends the relationship’s theoretical foundation. It is also expected to provide inspiration and serve as a reference for local Chinese management.

Details

Leadership & Organization Development Journal, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0143-7739

Keywords

Article
Publication date: 30 May 2023

Dario Aversa

Climate change has a direct impact on companies. Therefore, the scenario analysis is used to provide companies and stakeholders in this specific sector with forward-looking…

Abstract

Purpose

Climate change has a direct impact on companies. Therefore, the scenario analysis is used to provide companies and stakeholders in this specific sector with forward-looking measures and narratives of the world's future state. This work aims to provide an independent, wide and rigorous literature review on the topics of scenario analysis and climate change, analyzing a large set of referred papers included in economic journals on the Web of Science Clarivate Analytics data source. This review, by means of a mixed approach, can help address new policy strategies and business models.

Design/methodology/approach

The work employs 416 abstracts and relative titles in the field of economics, employing data mining for qualitative variables and performing descriptive statistics and lexicometric measures, similarity analysis and clustering with Reinert's hierarchical method in order to extract knowledge. Furthermore, qualitative content analysis allows for the return of a comprehensive and complete universe of meaning, as well as the analysis of co-occurences.

Findings

Content analysis reveals three main classification clusters and four unknown patterns: model area, risks, emissions and energy and carbon pricing, indicating research directions and limitations through an overview with an extensive reference bibliography. In the research, the prevalent use of quantitative instruments and their limitations emerge, while qualitative instruments are residual for climate change assessment; they also highlight the centrality of transition risk over adaptation measures and the combination of different types of instruments with reference to carbon pricing.

Originality/value

Scenario analysis is a relatively new topic in economics and finance research, and it is under-investigated by the academy. The analysis combines quantitative and qualitative research using text analytics.

Details

British Food Journal, vol. 126 no. 1
Type: Research Article
ISSN: 0007-070X

Keywords

Article
Publication date: 29 November 2021

Najimu Saka, Abdullahi Babatunde Saka, Opeoluwa Akinradewo and Clinton O. Aigbavboa

The complex interaction of politics and the economy is a critical factor for the sustainable growth and development of the construction sector (CNS). This study aims to…

Abstract

Purpose

The complex interaction of politics and the economy is a critical factor for the sustainable growth and development of the construction sector (CNS). This study aims to investigate the effects of type of political administration including democracy and military on the performance of CNS using the Nigerian Construction Sector (NCS) as a case study.

Design/methodology/approach

A 48 year (1970–2017) time series data (TSD) on the NCS and the gross domestic product (GDP) based on 2010 constant USD were extracted from the United Nations Statistical Department database. Analysis of variance (ANOVA) and analysis of covariance (ANCOVA) models were used to analyze the TSD. The ANCOVA model includes the GDP as correlational variable or covariate.

Findings

The estimates of the ANOVA model indicate that democratic administration is significantly better than military administration in construction performance. However, the ANCOVA model indicates that the GDP is more important than political administration in the performance of the CNS. The study recommends for a new national construction policy, favourable fiscal and monetary policy, local content development policy and construction credit guaranty scheme for the rapid growth and development of the NCS.

Originality/value

Hitherto, little is known about the influence of political administration on the performance of the CNS. This study provides empirical evidence from a developing economy perspective. It presents the relationships and highlights recommendations for driving growth in the construction industry.

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