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Article
Publication date: 7 August 2017

Nawar Mohammed Ridha Hashim, Mohd. Zamri Yusoff and Hussein Ahmed Mohammed

The purpose of this paper is to numerically study the phenomenon of separation and subsequent reattachment that happens due to a sudden contraction or expansion in flow…

Abstract

Purpose

The purpose of this paper is to numerically study the phenomenon of separation and subsequent reattachment that happens due to a sudden contraction or expansion in flow geometry, in addition, to investigating the effect of nanoparticles suspended in water on heat transfer enhancement and fluid flow characteristics.

Design/methodology/approach

Turbulent forced convection flow over triple forward facing step (FFS) in a duct is numerically studied by using different types of nanofluids. Finite volume method is employed to carry out the numerical investigations. with nanoparticles volume fraction in the range of 1-4 per cent and nanoparticles diameter in the range 30-75 nm, suspended in water. Several parameters were studied, such as the geometrical specification (different step heights), boundary conditions (different Reynolds [Re] numbers), types of fluids (base fluid with different types of nanoparticles), nanoparticle concentration (different volume fractions) and nanoparticle size.

Findings

The numerical results indicate that the Nusselt number increases as the volume fraction increases, but it decreases as the diameter of the nanoparticles of nanofluids increases. The turbulent kinetic energy and its dissipation rate increase as Re number increases. The velocity magnitude increases as the density of nanofluids decreases. No significant effect of increasing the three steps heights on Nusselt along the heated wall, except in front of first step where increasing the first step height leads to an increase in the recirculation zone size adjacent to it.

Research limitations/implications

The phenomenon of separation and subsequent reattachment happened due to a sudden contraction or expansion in flow geometry, such as forward facing and backward facing steps, respectively, can be recognized in many engineering applications where heat transfer enhancement is required. Some examples include cooling systems for electronic equipment, heat exchanger, diffusers and chemical process. Understanding the concept of these devices is very important from the engineering point of view.

Originality/value

Convective heat transfer can be enhanced passively by changing flow geometry, boundary conditions, the traditional fluids or by enhancing thermal conductivity of the fluid. Great attention has been paid to increase the thermal conductivity of base fluid by suspending nano-, micro- or larger-sized particles in fluid. The products from suspending these particles in the base fluid are called nanofluids. Many studies have been conducted to investigate the heat transfer and fluid flow characteristics over FFS. This study is the first where nanofluids are employed as working fluids for flow over triple FFS.

Details

World Journal of Engineering, vol. 14 no. 4
Type: Research Article
ISSN: 1708-5284

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Book part
Publication date: 1 March 2021

Siti Khomsatun, Hilda Rossieta, Fitriany Fitriany and Mustafa Edwin Nasution

The unique characteristic of Islamic bank leads in governance and disclosure. Using stakeholder, signaling, and market discipline theory, governance and adequate…

Abstract

The unique characteristic of Islamic bank leads in governance and disclosure. Using stakeholder, signaling, and market discipline theory, governance and adequate disclosure may increase bank soundness. This study aims to investigate the relationship of sharia disclosure and Sharia Supervisory Board in influencing Islamic bank soundness in the different regulatory framework of the country. Using purposive sampling, the research covered 84 Islamic banks in 16 countries during the period 2013–2015 with lag data of Islamic bank soundness. The result shows sharia disclosure influences on Islamic bank soundness for management efficiency, capital adequacy ratio, asset quality, and liquidity. The results also show that sharia disclosure mediates the indirect effect of SSB on Islamic bank soundness. The regulatory framework (sharia accounting standard and SSB regulation) shows moderating effect of regulation framework proved on the association of sharia disclosure with management efficiency, capital, and liquidity. The effect is indirectly depending on the regulatory framework for proxy management efficiency, capital, and liquidity. The implication of the research suggests that sharia disclosure could increase the market discipline mechanism of Islamic bank stream. The Islamic bank can increase the transparency using sharia disclosure as a branding for increasing public trust, even though in the deficient Islamic bank regulation countries.

Details

Recent Developments in Asian Economics International Symposia in Economic Theory and Econometrics
Type: Book
ISBN: 978-1-83867-359-8

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Expert briefing
Publication date: 10 December 2020

Opposition leaders are refusing to participate in the polls unless newly constituted electoral committees are reformed to eliminate bias towards Farmajo, among other things.

Details

DOI: 10.1108/OXAN-DB258134

ISSN: 2633-304X

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Book part
Publication date: 10 August 2018

Henry O. Onukwuba

Leadership is basically about influence and ability to cultivate followership. This chapter examined the nature of indigenous socio-political leadership in Africa using…

Abstract

Leadership is basically about influence and ability to cultivate followership. This chapter examined the nature of indigenous socio-political leadership in Africa using Zimbabwe, Sudan and Nigeria as caselets and compared this with the post-colonial or modern-day leadership realities. A survey was conducted among senior executives at Lagos Business School, Nigeria, with a sample size of 200 persons, to find out their perception of the African indigenous leadership system. An overwhelming 90% believe that culture plays a big role in shaping African leadership style. However, two-thirds of the respondents agreed that Africa lacks proper institutional structures to support good leadership, thus encouraging corruption (97% of the respondents) and non-accountability among the leaders. Also, only 5% thought cultural orientation was the reason why the African followers do not hold their leaders accountable. In other words, it is not in the African culture not to hold leaders accountable for their actions. So, what went wrong? We attempted a deeper look at the effect of colonial rule and the attendant militarisation of the African continent. Our conclusion is that the colonisation of the continent by Europe brought significant distortion to the traditional African indigenous leadership institutions and the psyche of the African leader and the followers alike. Post-colonial Africa has witnessed 133 recorded coups d’etat between 1952 and 2016. This chapter is recommended to all those who seek a deeper understanding of the nature of the African indigenous leadership practices and the factors that have shaped these over the years.

Details

Indigenous Management Practices in Africa
Type: Book
ISBN: 978-1-78754-849-7

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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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Book part
Publication date: 3 December 2005

Paul Paolucci, Micah Holland and Shannon Williams

Machiavelli's dictums in The Prince (1977) instigated the modern discourse on power. Arguing that “there's such a difference between the way we really live and the way we…

Abstract

Machiavelli's dictums in The Prince (1977) instigated the modern discourse on power. Arguing that “there's such a difference between the way we really live and the way we ought to live that the man who neglects the real to study the ideal will learn to accomplish his ruin, not his salvation” (Machiavelli, 1977, p. 44), his approach is a realist one. In this text, Machiavelli (1977, p. 3) endeavors to “discuss the rule of princes” and to “lay down principles for them.” Taking his lead, Foucault (1978, p. 97) argued that “if it is true that Machiavelli was among the few…who conceived the power of the Prince in terms of force relationships, perhaps we need to go one step further, do without the persona of the Prince, and decipher mechanisms on the basis of a strategy that is immanent in force relationships.” He believed that we should “investigate…how mechanisms of power have been able to function…how these mechanisms…have begun to become economically advantageous and politically useful…in a given context for specific reasons,” and, therefore, “we should…base our analysis of power on the study of the techniques and tactics of domination” (Foucault, 1980, pp. 100–102). Conceptualizing such techniques and tactics as the “art of governance”, Foucault (1991), examined power as strategies geared toward managing civic populations through shaping people's dispositions and behaviors.

Details

Social Theory as Politics in Knowledge
Type: Book
ISBN: 978-1-84950-363-1

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Article
Publication date: 1 March 2003

W.A.C Adie MA

Roots of global Terrorism are in ‘failed’ states carved out of multiracial empires after World Wars I and II in name of ‘national self‐determination’. Both sides in the…

Abstract

Roots of global Terrorism are in ‘failed’ states carved out of multiracial empires after World Wars I and II in name of ‘national self‐determination’. Both sides in the Cold War competed to exploit the process of disintegration with armed and covert interventions. In effect, they were colluding at the expense of the ‘liberated’ peoples. The ‘Vietnam Trauma’ prevented effective action against the resulting terrorist buildup and blowback until 9/11. As those vultures come home to roost, the war broadens to en vision overdue but coercive reforms to the postwar system of nation states, first in the Middle East. Mirages of Vietnam blur the vision; can the sole Superpower finish the job before fiscal and/or imperial overstretch implode it?

Details

International Journal of Commerce and Management, vol. 13 no. 3/4
Type: Research Article
ISSN: 1056-9219

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Expert briefing
Publication date: 7 June 2021

The deal opens a consensual path to elections after the parties agreed on steps to address disputes that have delayed polls since last December.

Details

DOI: 10.1108/OXAN-DB261922

ISSN: 2633-304X

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Geographic
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Content available
Article
Publication date: 28 October 2019

Mahmoud Mohieldin, Khaled Hussein and Ahmed Rostom

This paper aims to discuss the evolution of the Egyptian banking sector and the main trends in financial development in Egypt. The purpose of this study is to examine…

Abstract

Purpose

This paper aims to discuss the evolution of the Egyptian banking sector and the main trends in financial development in Egypt. The purpose of this study is to examine empirically the relationship between the development of the financial sector and economic growth in Egypt between 1980 and 2016.

Design/methodology/approach

The paper draws comparisons based on critical financial indicators between Egypt and selected emerging markets and developing economies. It uses a new data set of financial development indexes released by the International Monetary Fund. This paper uses econometric time series modelling of bivariate regressions for real growth per capita and measures of financial development to assess the relationship between financial development and economic growth in Egypt.

Findings

There are three specific findings based on the empirical analysis. First, there is a strong association between real growth per capita and financial development measured by money supply to GDP. Second, access to and the efficiency of banking services are not associated with real per capita income. Third, the Financial Markets Access Index – which compiles data on market capitalization outside of the top ten largest companies and the number of corporate issuers of debt – indicates a robust association with real per capita GDP.

Originality/value

The paper uses advanced empirical investigation techniques and new data sets available to assess the critical relationship between finance and growth in Egypt. The main policy implications of the empirical results of this paper suggest a stronger focus on promoting a more proactive role for the financial services industry in Egypt. In particular, there is a critical role for bank financing to support the private sector to maintain an inclusive growth momentum. Further development of the capital market will promote sustainability of such economic growth.

Details

Journal of Humanities and Applied Social Sciences, vol. 1 no. 2
Type: Research Article
ISSN:

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Expert briefing
Publication date: 3 January 2019

President Mohammed Abdullahi ‘Farmajo’ appears emboldened after facing down a series of domestic political crises, including allegations of interference in the South-west…

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