Aliyu M Aliyu

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Verified

Aliyu verified their affiliation via an institutional email.

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• PhD
• Associate Professor of Sustainable Energy at University of Lincoln

Over the last decade, there has been a re-emergence of hydrogen as a clean fuel for the energy transition towards net-zero carbon emissions. Hence, significant interest has been shown in low-carbon and green hydrogen to power this transition. Water electrolysis has been identified as the most common method for green hydrogen production. However, in...

This chapter delves into the crucial realm of renewable energy production and utilisation in Africa and addresses the pressing need to leverage Africa's abundant renewable resources for economic growth, energy security, and environmental preservation. This research aims to underscore the transformative potential of renewable energy adoption in Afri...

Medical and agricultural robots that interact with living tissue or pick fruit require tactile and flexible sensors to minimise or eliminate damage. Until recently, research has focused on the development of robots made of rigid materials, such as metal or plastic. Due to their complex configuration, poor spatial adaptability and low flexibility, r...

The aim of this paper is to develop design options for Augmented Reality (AR)-based remote service business models to support the implementation of AR technology for remote services currently taking place in the manufacturing industry. The design options were developed using a qualitative content analysis based on the results of a systematic litera...

One of the biggest challenges that the world faces today is the availability of fresh and potable water in arid, semi-arid, and deprived regions. This is a challenge that concerns not only economic development but also social development spanning several UN SDGs. This article presents a detailed critical and systematic review of the technologies fo...

This paper presents a comprehensive study on the redesign of a dewatering process in a polymer sludge wastewater treatment plant. The study focuses on addressing the challenges posed by high levels of organic pollutants in the sludge, with the aim of enhancing dewaterability, reducing odors, and minimizing suspended solids. Initially, a vacuum belt...

Carbon dioxide, the leading contributor to anthropogenic climate change, is released mainly via fossil fuel combustion, mostly for energy generation. Carbon capture technologies are employed for reducing the emissions from existing huge point sources, along with capturing them from direct air, to reduce the existing concentration. This paper provid...

This paper introduces a groundbreaking approach to demand response management, aiming to empower consumers through innovative strategies. The key contribution is the concept of “acquiring flexibility rights”, wherein consumers engage with power aggregators to curtail energy usage during peak-load periods, receiving incentives in return. A flexibili...

The steel sector is a foundation of modern society and is present in many aspects of our lives. The industry has over the last decade been facing increased environmental and climate pressure to lower its carbon footprint while remaining economically competitive. Decarbonizing this sector is challenging but nevertheless key for achieving climate goa...

The phenomenon of liquid droplet impingement on solid surfaces is particularly important in industrial applications related to spray coating, thermal spraying, inkjet printing, spray cooling, and powder generation industries. Atomized liquid metal droplet impact over surfaces where impingement on both stationary and rotating surfaces, such as rotat...

Gas injection is a frequently used method for artificial lift and flow regime rectification in offshore production and transportation flowlines. The flow behaviour in such flowlines is complex and a better understanding of flow characteristics, such as flow patterns, void fraction/hold up distributions and pressure gradient is always required for e...

This study numerically investigates kinematics of dynamic stall, which is a crucial matter in wind turbines. Distinct movements of the blade with the same angle of attack (AOA) profile may provoke the flow field due to their kinematic characteristics. This induction can significantly change aerodynamic loads and dynamic stall process in wind turbin...

When designing control valves for multiphase applications using conventional valve sizing methodologies, it is assumed that the flow properties such as mixture density and volume fraction of phases are uniform throughout the valve trim. In reality, however, the properties may be different due to the difference in the gas and liquid densities as wel...

Liquid loading is an undesired phenomenon in gas wells that occurs when producing wells attain a flow rate below which liquid will not be able to flow to the surface. The inability of the energy from the gas to transport the liquid to the surface causes back flow and eventual accumulation of liquid at the wellbore. This is characterised by intermit...

Multi-tube multi-fin heat exchangers are extensively used in various industries. In the current work, detailed experimental investigations were carried out to establish the flow/heat transfer characteristics in three distinct heat exchanger geometries. A novel perforated plain fin design was developed, and its performance was evaluated against stan...

The complex conductivity method is frequently used in hydro-/petro-/environmental geophysics, and considered to be a promising tool for characterizing and quantifying the properties of subsurface rocks, sediments and soils. We report a study on the complex conductivity characteristics of porous media containing gas hydrates through numerical modell...

Understanding the behaviour of gas–liquid flows in upward and downward pipe configurations in chemical, petroleum, and nuclear industries is vital when optimal design, operation, production, and safety are of paramount concern. Unfortunately, the information concerning the behaviour of such flows in large pipe diameters is rare. This article aims t...

Prior to full electric conversion, internal combustion engines will still maintain a paramount position in heavy goods and earth-moving vehicles. The most promising, cleaner alternative to fossil fuels is biodiesel. While it does not require alterations in the engine design, hence no major overhaul of existing infrastructure, biodiesel is more sust...

Proper selection and application of interfacial friction factor correlations has a significant impact on prediction of key flow characteristics in gas–liquid two-phase flows. In this study, experimental investigation of gas–liquid flow in a vertical pipeline with internal diameter of 0.060 m is presented. Air and oil (with viscosities ranging from...

In December 2019, the SARS-CoV-2 virus emerged and rapidly spread throughout the world. It causes the respiratory disease COVID-19 via the transmission of microbial pathogens within bio-aerosols during speaking, sneezing, and coughing. Therefore, understanding bioaerosol dynamics is important for developing mitigation strategies against droplet-ind...

Selection of appropriate friction factors is paramount for accurate prediction of key flow characteristics in gas–liquid two-phase flows. In this work, experimental investigation of vertical air and oil (with viscosities up to 200 mPa s) flow in a 0.060-m ID pipe is reported. Superficial air and oil velocity ranges utilized are from 22.37 to 59.06...

In this study, an investigation of sand transport in heavy-oil/water multiphase flow is performed. The study is conducted in three multiphase-flowpipeline-test facilities with internal diameters (IDs) of 1, 1, and 3 in. The pipeline orientations relative to the horizontal in the facilities are 0, +30, and 0°, respectively. Oil viscosity of 3.5 and...

Hydrocarbon exploration basically requires effective drilling and efficient overpowering of frictional and viscosity forces. Normally, frictional power losses occur in deep well systems and it is essential to analyse each component of any well system to determine where exactly pressure is lost, and this can be done using Nodal Analysis. In this stu...

We report an experimental study has been conducted on a 52 mm internal diameter vertical riser of which is met at the riser base by a 10.5 m long. The effect of two different gas inlet configurations were tested: riser base gas injection and horizontal inline injection 40 meters upstream of the riser base. A 16×16 wire-mesh sensor was used to measu...

Pressure gradient (PG) is vital in the design/operation of process equipment e.g. in determining pumping requirements and has direct effect on capital and running costs. Here, we report a gas–liquid experimental study using a large diameter pipeline system. Pressure was measured at two locations of each section of the upward and downward flowing se...

For safety-critical industrial applications, severe-service valves are often used, and the conditions during operations can be either single phase or multiphase. The design requirements for valves handling multiphase flows can be very different to the single-phase flow and depend on the flow regime within valves. The variation in flow conditions du...

New simulation and experimental results have been obtained and are presented for a multi-tube fin heat exchanger unit, from which semi-analytical correlations for the Fanning friction and Colburn factors were developed. The multi-tube and fin heat exchanger represents the main component of the Fan Coil Unit, an essential component of HVAC systems u...

Gas void fraction plays a significant role in determination of several multiphase flow parameters. Good insight of its behaviour coupled with accurate prediction is imperative for design of efficient equipment which has the potential to translate to higher production rates in the petroleum industry. Against the background of the prevalence of highe...

An experimental investigation on the hydraulic transport of sand particles in pipelines is presented in both horizontal and 30° upward inclined orientations. The pipe, with an internal diameter of 0.0254 m, had sand transported in various water superficial velocities at low and high sand concentrations [0.1%-10% volume-to-volume ratio (v/v)]. Sand...

An experimental study is conducted using a 0.075-m ID pipe to investigate characteristics of two- and three-phase stratified flow in a horizontal pipeline. Experiments are conducted under low to medium liquid loading conditions which is common in wet-gas and long transportation pipelines. The flow characteristics investigated include flow pattern,...

Slug translational velocity, described as the velocity of slug units, is the summation of the maximum mixture velocity in the slug body and the drift velocity. Existing prediction models in literature were developed based on observation from low viscosity liquids, neglecting the effects of fluid properties (i.e., viscosity). However, slug translati...

In this study, experiments were carried out in a vertical 60-mm internal diameter pipe with air and oil (viscosities 100–330 mPa s) constituting the gas and liquid phases. Superficial air and oil velocity ranges used were 9.81–59.06 m/s and 0.024–0.165 m/s, respectively. Visual observations and change in slope of pressure drop– Vsg plot were used t...

Previous research work has shown that sand production with hydrocarbons has helped to increase the productivity of oil wells. However, this poses difficulties during shut down and start-up operations due to sand deposition and are aggravated when the pipelines are undulating. The hilly-terrain geometry of pipelines strongly affects multiphase flow...

Producing sand during oil and gas production is unavoidable. Sand is produced along with oil and gas and its deposition in pipelines is a significant risk as it can cause pipe corrosion and flow assurance difficulties. It is therefore key that flow conditions are sustained to guarantee lack of deposition of sand particles. The minimum combination o...

Slug translational velocity, described as the velocity of slug units, is the summation of the maximum mixture velocity in the slug body and the drift velocity. Accurate estimation of this parameter is important for energy-efficient design of oil and gas pipelines. A survey of the literature revealed that existing prediction models of this parameter...

This paper presents steady-state simulation and exergy analysis of the 2-amino-2-methyl-1-propanol (AMP)-based post-combustion capture (PCC) plant. Exergy analysis provides the identification of the location, sources of thermodynamic inefficiencies, and magnitude in a thermal system. Furthermore, thermodynamic analysis of different configurations o...

The concurrent flow of gas with a mixture of oil and water is often observed in production tubing in the petroleum industry. Lack of physical understanding of the several phenomenological characteristics of three-phase flow can lead to unsatisfactory production rates or even oversizing of pipelines. Additional investigations to gain more insight...

An experimental study on highly viscous oil-water two-phase flow conducted in a 5.5 m long and 25.4 mm internal diameter (ID) pipeline is presented. Mineral oil with viscosity ranging from 3.5 Pa.s – 5.0 Pa.s and water were used as test fluid for this study. Experiments were conducted for superficial velocities of oil and water ranging from 0.06 to...

Sand production in the life of oil and gas reservoirs is inevitable, as it is co-produced with oil and gas from reservoirs. Its deposition in petroleum pipelines poses considerable risk to production and can lead to pipe corrosion and flow assurance challenges. Therefore, it is important that pipe flow conditions are maintained to ensure sand parti...

Slug flow is one of the most critical and often encountered flow patterns in the oil and gas industry. It is characterised by intermittency which results in large fluctuations in liquid holdup and pressure gradient. A proper understanding of its parameters (such as slug holdup) is essential in the design of transport facilities (e.g. pipelines) and...

This paper presents the application and a comparative study of two ejector configurations to enhance the momentum transfer of submerged bubble swarms generated in a water tank. High-speed photography was used to measure the bubble rise velocity profiles and bubble size distribution from captured images. The volumetric flowrate of air was varied fro...

The effect of liquid crossflow on the behaviour of submerged bubbles was examined using a theoretical time-varying model based on the equations of motion in two-dimensional space. The results were compared with experimental rise velocities and previously obtained trajectories. Bubble images were recorded using high-speed photography at gas flow rat...

In this study, we report an experimental investigation into the bubble generation characteristics of a venturi-type ejector. A 5-mm-diameter vertically upwards nozzle placed in a 1-m3 water tank was used to generate bubbles at between 2 and 20 L/min airflow rate corresponding to a Reynolds number range of 1.7–17 × 103. High-speed photography and im...

Bubbly flows are frequently encountered in many industrial applications where multiphase contact is used to promote heat, mass and momentum transfer. These include applications where both chemical and physical processes occur, such as wastewater treatment and biological aeration systems. We investigated the behaviour of underwater-generated bubble...

Electrical capacitance tomography (ECT) and gamma ray densitometry have found applications in multiphase flows as both have been used to visualize flow patterns in the process, nuclear, chemical and oil-gas industries. However, liquid viscosity is often limited to about 10 cP in most of these applications. This study evaluates the suitability of EC...

Heavy oil accounts for a major portion of the world’s total oil reserves. Its production and transportation through pipelines is beset with great challenges due to its highly viscous nature. This paper studies the effects of high viscosity on heavy oil two-phase flow characteristics such as pressure gradient, liquid holdup, slug liquid holdup, slug...

The article should be Study of high viscous multiphase flow in a horizontal pipe.

We investigate the effect of crossflow velocity on submerged bubble plumes or swarms by employing the use of high-speed photography and an image-processing method to measure bubble rise velocities. Particle image velocimetry (PIV) was used to accurately determine the crossflow freestream velocity as well as boundary layer information. We varied the...

An experimental investigation was carried out on the effects of high liquid viscosities on slug length in a 0.0762-m ID horizontal pipe using air-water and air-oil systems with nominal viscosities ranging from 1.0 to 5.5 Pa s. The measurements of slug length were carried out using two fast sampling gamma densitometers with a sampling frequency of 2...

We investigate the effect of a return U-bend on flow behaviour in the vertical upward section of a large-diameter pipe. A wire mesh sensor was employed to study the void fraction distributions at axial distances of 5, 28 and 47 pipe diameters after the upstream bottom bend. The study found that, the bottom bend has considerable impacts on up-flow b...

Slug frequency is an important input parameter in most mechanistic and semi-mechanistic models used for estimating slug flow characteristics such as pressure gradient, slug length and slug holdup. It is also essential in the design and sizing of transport and/or production pipelines, process flow control, design and operation of process equipment,...

A dual-channel optical fiber probe was developed to quantify the bubble characteristics (void fraction, velocity, and bubble size) in a gas–liquid annular ejector system. Water is pumped upstream of the ejector contraction. Since a low pressure region exists downstream in the ejector diffuser, this permits air to be sucked into the flowing liquid b...

We present an experimental study on the flow behaviour of gas and liquid in the upward section of a vertical pipe system with an internal diameter of 101.6 mm and a serpentine geometry. The experimental matrix consists of superficial gas and liquid velocities in ranges of 0.15–30 m/s and from 0.07 to 1.5 m/s, respectively, which cover bubbly to ann...

The entrained droplet fraction is an important parameter in annular two-phase flow, as its correlations are key inputs in flow simulation codes for the prediction of pressure drop and critical heat flux or dryout. Investigators have stressed the importance of extending the validity range of current correlations so that more conditions are covered....

Accurate prediction of interfacial friction between the gas and liquid in annular two-phase flow in pipes is essential for the proper modelling of pressure drop and heat transfer coefficient in pipeline systems. Many empirical relationships have been obtained over the last half century. However, they are restricted to limited superficial liquid and...

The number of slug units that traverses a particular point at a given time within a defined pipe cross-section is known as slug frequency. The behaviour of this critical parameter for two-phase flow in high viscosity oils is significantly different from those of conventional oils (of less than 1 Pa.s). In this experimental investigation, new data o...

In comparison to upwards two-phase flows, the behaviour of downwards gas/liquid flows in large pipes is poorly understood and data is scarce in the open literature. To attempt to address this, experiments were conducted in a large diameter flow loop with a serpentine configuration. Measurements showed that the pressure gradients over the upper and...

Interfacial friction is one of the key variables for predicting annular two-phase flow behaviours in vertical pipes. In order to develop an improved correlation for interfacial friction factor in downward co-current annular flow, the pressure gradient, film thickness and film velocity data were generated from experiments carried out on Cranfield Un...

An experimental study on air/water flow behaviours in a 101.6 mm i.d. vertical pipe with a serpentine configuration is presented. The experiments are conducted for superficial gas and liquid velocities ranging from 0.15 to 30 m/s and 0.07 to 1.5 m/s, respectively. The bend effects on the flow behaviours are significantly reduced when the flow reach...

Production tubing from gas wells generally contains multiphase mixtures of gas condensates, oil and water in what is termed wet gas. The dominant flow pattern is annular where the liquids flow along the pipe inner periphery and the droplet laden gas phase flows in the pipe core. The entrained droplet fraction is important in calculating holdup and...

There is increasing evidence that gas/liquid two phase flow behaviour in large pipes (with diameter >100 mm) differs from those of smaller pipes. It has therefore become imperative that flow correlations are exclusively derived for large pipes so as to facilitate more accurate prediction of heat transfer and pressure drop in pipes and boilers encou...

The optimization of biodiesel production from a Typical Nigerian cottonseed oil using sodium hydroxide as catalyst is presented. 23 factorial design was employed to study the combined effect of temperature (40–60ı C), mole ratio of methanol to oil (6:1–8:1) and catalyst concentration (0.5–1.0 wt%). The optimum yield of 96.23 wt% was obtained at 0.5...

The major challenge associated with the commercial production of biodiesel is the high cost of edible vegetable oil. This necessitates the use of non edible oil such as Jatropha curcas oil for the production of biodiesel. The research presents the report of optimization of alkaline transesterification of Jatropha curcas oil using Response Surface M...

This research work focuses on the production of biodiesel from refined cottonseed oil via alkaline-transesterification process using sodium hydroxide catalyst and methanol. Optimization was carried out using a 2 3 factorial design experiment, three variables namely mole ratio of methanol to oil, catalyst concentration and reaction temperature were...

Feedstock costs accounts for the larger percentage of biodiesel production cost. The use of less expensive feedstock and optimization of the process variables that affect the yield presents the opportunity of significantly reduction of this cost. This paper investigates the effect of temperature and catalyst concentration on the transesterification...

Petroleum development and production have resulted in soil degradation, the generation of air and water pollutants, solid and hazardous wastes. In this study, the degradation potential of polycyclic aromatic hydrocarbons (PAHs) was investigated using a consortia of mixed bacterial culture. Phenanthrene, a three-ringed angular PAH, known to be a hum...

Nigeria as a nation has appreciable distribution of process industries engaged in the importation of refractory materials, despite the relative abundance of local raw materials needed for the production of these materials. This study present the results of comparative analysis and evaluation of the refractory properties of some selected clay deposi...

Niger is a resource rich country. Nevertheless, despite the relative abundance of local raw materials needed for the production of refractory materials for its process industries, Nigeria is heavily engaged in the importation of these materials. This study presents the results of comparative analysis and evaluation of the refractory properties of s...

The industrialization of oil seeds is fast becoming an important agro-industrial activity worldwide. This study presents the results of extraction, refining and characterization of both crude and refined Nigerian shea butter oil. The results of characterization of crude and refined oil shows specific gravity of 0.86 and 0.89, moisture content of 2....