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Aliyu M. Aliyu

Bio: Aliyu M. Aliyu is an academic researcher from University of Huddersfield. The author has contributed to research in topics: Two-phase flow & Pressure drop. The author has an hindex of 11, co-authored 61 publications receiving 408 citations. Previous affiliations of Aliyu M. Aliyu include De Montfort University & Cross River University of Technology.

Papers published on a yearly basis

Papers
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Journal ArticleDOI
TL;DR: In this article, an examination of published interfacial friction factor correlations was carried out using a diverse database which was collected from the open literature for vertical annular flow for diameters between 10 and 50mm.

47 citations

Journal ArticleDOI
TL;DR: In this paper, an experimental study on air/water flow behaviors in a 101.6mm i.d. vertical pipe with a serpentine configuration is presented, where the experiments are conducted for superficial gas and liquid velocities ranging from 0.15 to 30m/s and 0.07 to 1.5m /s, respectively.

47 citations

Journal ArticleDOI
TL;DR: In this paper, the authors identified the most impactful methods of cyberattacks that targeted the health sector during the COVID-19 pandemic, as well as the challenges in cybersecurity, solutions, and areas in need of improvement.
Abstract: Background: COVID-19 has challenged the resilience of the health care information system, which has affected our ability to achieve the global goal of health and well-being. The pandemic has resulted in a number of recent cyberattacks on hospitals, pharmaceutical companies, the US Department of Health and Human Services, the World Health Organization and its partners, and others. Objective: The aim of this review was to identify key cybersecurity challenges, solutions adapted by the health sector, and areas of improvement needed to counteract the recent increases in cyberattacks (eg, phishing campaigns and ransomware attacks), which have been used by attackers to exploit vulnerabilities in technology and people introduced through changes to working practices in response to the COVID-19 pandemic. Methods: A scoping review was conducted by searching two major scientific databases (PubMed and Scopus) using the search formula “(covid OR healthcare) AND cybersecurity.” Reports, news articles, and industry white papers were also included if they were related directly to previously published works, or if they were the only available sources at the time of writing. Only articles in English published in the last decade were included (ie, 2011-2020) in order to focus on current issues, challenges, and solutions. Results: We identified 9 main challenges in cybersecurity, 11 key solutions that health care organizations adapted to address these challenges, and 4 key areas that need to be strengthened in terms of cybersecurity capacity in the health sector. We also found that the most prominent and significant methods of cyberattacks that occurred during the pandemic were related to phishing, ransomware, distributed denial-of-service attacks, and malware. Conclusions: This scoping review identified the most impactful methods of cyberattacks that targeted the health sector during the COVID-19 pandemic, as well as the challenges in cybersecurity, solutions, and areas in need of improvement. We provided useful insights to the health sector on cybersecurity issues during the COVID-19 pandemic as well as other epidemics or pandemics that may materialize in the future. Trial Registration:

45 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of high liquid viscosities on slug length in a 0.0762m ID horizontal pipe using air-water and air-oil systems with nominal viscosity ranging from 1.0 to 5.5

30 citations

Journal ArticleDOI
TL;DR: In this paper, the entrained droplet fraction in annular two-phase flow is measured by measuring the film velocity, from which the fraction of droplets were calculated. And the authors used a capacitance wire mesh sensor for flow visualisation in order to distinguish between annular and churn flow.

28 citations


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Journal ArticleDOI
TL;DR: In this paper, the authors present a pedagogical review of hydrodynamic instability-induced turbulent flows, including Rayleigh-Taylor, Richtmyer-Meshkov, and Kelvin-Helmholtz instabilities.
Abstract: In diverse areas of science and technology, including inertial confinement fusion (ICF), astrophysics, geophysics, and engineering processes, turbulent mixing induced by hydrodynamic instabilities is of scientific interest as well as practical significance. Because of the fundamental roles they often play in ICF and other applications, three classes of hydrodynamic instability-induced turbulent flows—those arising from the Rayleigh-Taylor, Richtmyer-Meshkov, and Kelvin-Helmholtz instabilities—have attracted much attention. ICF implosions, supernova explosions, and other applications illustrate that these phases of instability growth do not occur in isolation, but instead are connected so that growth in one phase feeds through to initiate growth in a later phase. Essentially, a description of these flows must encompass both the temporal and spatial evolution of the flows from their inception. Hydrodynamic instability will usually start from potentially infinitesimal spatial perturbations, will eventually transition to a turbulent flow, and then will reach a final state of a true multiscale problem. Indeed, this change in the spatial scales can be vast, with hydrodynamic instability evolving from just a few microns to thousands of kilometers in geophysical or astrophysical problems. These instabilities will evolve through different stages before transitioning to turbulence, experiencing linear, weakly, and highly nonlinear states. The challenges confronted by researchers are enormous. The inherent difficulties include characterizing the initial conditions of such flows and accurately predicting the transitional flows. Of course, fully developed turbulence, a focus of many studies because of its major impact on the mixing process, is a notoriously difficult problem in its own right. In this pedagogical review, we will survey challenges and progress, and also discuss outstanding issues and future directions.

138 citations

Journal ArticleDOI
TL;DR: In this paper, the authors presented a detailed overview of safflower plant, the physicochemical properties of SA and its biodiesel, the performance, emission and combustion characteristics of the SA biodiesel when used in a diesel engine.
Abstract: Nowadays, energy consumption is progressively boosting in all sectors because of the rising in population and enhancing lifestyle. The dependency over fossil-based fuels has been increasing due to the ever-growing need for energy. The declining characterization of such energy sources and the increment nature of energy demand have led to vital apprehensions of energy regarding future energy safety. Keeping this in mind, the usage of alternative fuels such as biodiesel can be one of the possible solutions in order to accomplish the future energy demand. In this context, the biodiesel production is an attractive way for researchers. Biodiesel is non-toxic, biodegradable and renewable fuel that can be produced from vegetable oils, animal fats and also their wastes by applying different techniques. Contrary to the advantages, the biggest disadvantage of biodiesel is that costs are largely dependent on the feedstock. Although it has the nature of the food, safflower (Carthamus tinctorius L.) can be utilized as a feedstock for biodiesel production because its oil consumption is limited and it can be grown in arid and dry areas all over the world. This review paper has presented a detailed overview of safflower plant, the physicochemical properties of safflower oil and its biodiesel, the performance, emission and combustion characteristics of the safflower oil biodiesel when used in a diesel engine. The findings of the present work revealed that biodiesel production from safflower oil is possible and the observations from the literature resulted in comparable fuel properties, engine performance and emission parameters with those of diesel.

95 citations