Browsing by Author "Aliyu, Abdulkabir"

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    Development of bio-based cutting fluid from roselle oil with titanium dioxide nano additive for cnc machine turning operation
    (Cranfield University, 08/11/2022) Haruna, Mohammed Sani; Kaisan, Muhammad Usman; Kawule, Muhammad Ibrahim; Aliyu, Abdulkabir
    The research work titled Development of Bio-Based Cutting Fluid from Roselle Oil with Titanium Dioxide Nano Additive for CNC Machine Turning Operation was carried out in in line with the global best practices of ensuring sustainable production during Computer Aided Manufacturing. Nano additive were collected in three different samples base oil 0 wt %, 0.5wt% and 1wt% of TiO2. Viscosity test was carried out using a viscometer with base oil, 0.5wt% and 1.0wt% having 3.19, 2.86 and 2.75m²/s respectively. Furthermore, the identification of unknown materials and confirmation of the sample materials were analyzed using FTIR spectroscopy with the materials being identified as carboxyl, hydroxyl, alkane, amide carboxyl and amide acid. Turning operation was carried out on a Harrison center machine with a mild steel work piece at constant depth of cut (1.5mm), constant feed rate (0.3mm) and cutting speeds at 80, 160 and 240rev/min. tool wear, surface finish, chip thickness and chip formation were analyzed. With an increase in Nano fluid concentration of 0.5wt% and 0.1wt% relative to base oil, a decrease in kinematic viscosity has been observed. In comparison to base oil and 0.5wt% TiO2, Nano fluid equal to 1.0wt% TiO2 shows enhanced results. When titanium dioxide was added instead of base oil, tool wear and surface finish are enhanced more. The percentage increase in nanoparticles, along with the observed changes in chip thickness, shape, and formation, point to the importance of nanoparticles at the tool/workpiece interface.
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    Estimating slug liquid holdup in high viscosity oil-gas two-phase flow
    (Elsevier, 2018-10-29) Archibong-Eso, Archibong; Okeke, Nonso Evaristus; Baba, Yahaya D.; Aliyu, Abdulkabir; Lao, Liyun; Yeung, H.
    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 process equipment (slug catchers, separators etc.). In this paper, experimental investigation of slug liquid holdup (defined as the liquid volume fraction in the slug body of a slug unit) is performed. Mineral oil with viscosity, μ=−0.0043T3+0.0389T2−1.4174T+18.141 and air were used as test fluids. A 0.0254 m and 0.0762 m pipe internal diameters facilities with pipe lengths of 5.5 and 17 m respectively were used in the study. Electrical Capacitance Tomography was used for slug holdup measurements. Results obtained in the study shows that slug liquid holdup varied directly as the viscosity and inversely as the gas input fraction. Existing slug holdup correlations and models in literature did not sufficiently predict present experimental results. A new empirical predictive correlation for estimating slug liquid holdup was derived from present experimental databank and from data obtained in literature. The databank's liquid viscosity ranges from 0.189 – 8.0 Pa.s. Statistical analysis of the new correlation vis-à-vis existing ones showed that the present correlation gave the best performance with an average percent error, E1; absolute average percent error, E2 and standard deviation, E3 of 0.001, 0.05 and 0.07 respectively, when tested on the high viscosity liquid–gas databank.