Research Papers/Topics in Mechanical Engineering

Biomass Gasification Using A Horizontal Entrained-Flow Gasifier And Catalytic Processing Of The Product Gas

Abstract  A novel study on biomass-air gasification using a horizontal entrained-flow gasifier and catalytic processing of the product gas has been conducted. The study was designed to investigate the effect of catalyst loading on the product gas. The use of a horizontal entrained-flow gasifier reactor was used to assess the effect of the gasifier reactor orientation on the gasification process. Both experimental and computational fluid dynamics (CFD) approaches were employe...

Low Turbulence Natural Convection In Triangular Enclosures

ABSTRACT In many types of buildings, both single and multi-storey, including schools, offices, places of worship, factories and residential buildings, the attic space is often given paramount consideration because its thermal characteristics have great influence on the conditions of the space directly below it. A significant amount of the cooling load in residential and industrial buildings is the result of heat transfer across the ceiling from the attic. Also, in some rural areas in...

Laminar Free Convective Heat Transfer In Parabolic Enclosures

ABSTRACTThe laminar free convective heat transfer characteristics of parabolic enclosures have been investigated using numerical computation and experimental modeling methods. The geometry is a long cavity made up of a parabolic wall bowed over a horizontal wall. Due to symmetry, the analytical model is one half of a two-dimensional cross-section consisting of a hot parabolic upper-wall, a cold horizontal base-wall of width B, and an adiabatic vertical wall of height, H.Two cases of hea...

Analysis Of Dynamic Stress Propagation Of A Vibrating Subsea Structure In A Pressurized Environment

ABSTRACT Offshore pipeline and flow line systems define a variety of subsea architectures associated with Floating Production Storage and Offloading units (FPSOs) or Floating Storage and Offloading units (FSOs) that are usually employed for oil and gas production in deep and ultra deep waters. The design of such transmission facilities, must satisfactorily account for various phenomena such as hydrodynamic wave loading, fluid transport velocity, operating pressure and temperature of the...

Energy Benchmarking And Carbon Footprint Reduction Opportunities In Portland Cement Manufacturing Processes In Nigeria

ABSTRACTEnergy benchmarking and carbon footprint reduction opportunities in Portland cementmanufacturing processes in Nigeria are presented. Life Cycle Assessment (LCA) isused to estimate the environmental impact of three cement manufacturing processes inNigeria. The energy consumption of the cement manufacturing processes are evaluatedusing energy Benchmarking and Energy Savings Tool for cement (BEST-Cement).BEST-Cement evaluates and compares the energy consumption of the cementmanufacturing...

Design And Fabrication Of A Prototype Press Tool For The Manufacture Of An Item Of Cutlery

SUMMARYMetal forming is a production technique which enhances economic use of engineering material by minimizing metal wastage that occurs in machining processes such as lathe turning and milling. This technique employs a press tool for mass production of parts that are dimensionally compatible. The press tool comprises the section that provides the force the press, and the tooling section the die. Investigation of stretch-forming conditions to produce a si dome in order to determine...

Designing A Continuous Quality Improvement Framework For Improving Electrowinning Current Efficiency

ABSTRACTThe use of quality control techniques such as Statistical Process Control (SPC) has become essential for any business to thrive in the modern industry. Statistical quality control is one of the reasons why the Japanese had a significant advantage over their competitors. However, many organizations are still not yet applying this powerful quality control technique (Ben & Jiju, 2000; Helm, 2018). In addition to that, although substantial research has been done to improve electro...

Synthesis And Characterization Of Biofuels From Various Nigerian Crops For Internal Combustion Engines

ABSTRACT Bio-fuels (Biodiesel and Bio-ethanol fuels) are synthesized from various Nigerian crops (palm(Elaeis Guineensis) wine, raffia(Raffia Vinefera) trunk, sugar cane(Saccharum L), physic nut seed (Jatropha Curcas), castor bean seed(Ricinus Communis), sandbox seed (Hura Crepitans) and African bush mango nut (Dika Nut) (Irvingia Gabonensis)) to serve as alternative fuels for internal combustion engines. The direct base-catalyzed trans-esterification process is employed in the biodiesel...

Measurement methods for hydropower resources: a review

Abstract: Each hydropower plant is usually designed for specific amount of discharge and gross head. This paper presents themethods used to measure the discharge and gross head variables with additional of assessment tools. Dischargemeasurement methods covered include bucket, float, velocity-area, dilution, hydraulic structure and advanceddischarge measurement while gross head measurement methods covered include topographic and DEM maps, hoselevel with pressure gauge, sight level, spirit leve...

Experimental Investigation Of Upflow Bioreactors With Central Substrate Dispenser

ABSTRACT  Experimental investigation of anaerobic digestion of the organic fraction of municipal solid waste (MSW) in an upflow bioreactor with central substrate dispenser (UBCSD) is presented. The UBCSD consists of two similar size bioreactors joined by a central substrate dispenser (CSD). The UBCSD is a component of an integrated system of bioreactors also containing the upflow anaerobic sludge blanket (UASB) reactor and the continuous stirred tank reactor (CSTR), assembled system...

ENERGY - Exergy Based Performance Analysis Of A Solid Adsorption Solar Refrigerator

ABSTRACT  The Energy - Exergy based performance analysis of the Solid Adsorption Solar Refrigerator is presented. The system comprises the collector/generator/adsorber, the condenser and the evaporator. It utilizes activated carbon/methanol as its adsorbent/adsorbate working combination. The exergy performance analysis of this refrigerator involves detailed assessment of all the following sub-processes that make up the refrigeration cycle, which are isosteric heat-up phase, desorpti...

Carbon Monoxide Exposure During Cooking In Households: A Case Of Dar Es Salaam City, Tanzania

Abstract Exposure to CO (carbon monoxide) during cooking in households using LPG (liquefied petroleum gas), natural gas and charcoal as fuels has been conducted. The study aimed at assessing the indoor air quality in order to address potential hazards associated with CO. Carbon monoxide concentrations and flame temperature were measured at an interval of 1 min for 1 h using CO and thermometer data loggers respectively. While the CO concentration from LPG and natural gas were found below 26...

Assessment of hydropower resources in Tanzania. A review article

Abstract. The hydropower resources have become an attractive means of generating electricity to the off-gridnetwork, especially in rural areas. This article assesses the small, mini and large hydropower resources andidentified to reach 5.3GW for electricity generation in Tanzania. The technology development discussedcomprises of hydro turbine manufacturers, classification and turbine selection. The barriers presented includethe presence of sediment in the hydropower reservoirs, financial viab...


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