Research Papers/Topics in Mechanical Engineering

EXERGY ANALYSIS OF COUNTER FLOW FORCED DRAFT WET COOLING TOWER (CASE STUDY OF PORT HARCOURT REFINERY)

This study evaluated the exergy analysis of the mechanical forced draft counter flow of the Port Harcourt Refinery cooling towers. The exergy analysis was carried out using the exergy destruction method. The results of the investigation and optimization show that the exergy destruction increases with the increases in mass flow rates of the cooling water, makeup water, and Air. Also, exergy destruction decreases with the decreases in Humidity Ratio, Heat sink Temperature, and&nb...

Dynamic Modelling of a Vapour Compression Air Conditioner System

ABSTRACT Modelling is a very important tool for understanding complex problems. A model plays a fundamental role in the analysis, design and development of complex systems, especially when physical testing and experimentation are not feasible - or not possible at all. Modelling technology holds tremendous promise for reducing costs, improving quality, and shortening the time-to-market for manufactured goods. Unfortunately, this technology still remains largely underutilized by indus...

Development of Local Technology for a Small-Scale Biochar Production Processes from Agricultural Wastes

Abstract A charcoal fired reactor for small-scale production of biochar was successfully designed, fabricated and tested. The method of biochar production offered by this equipment was evaluated by comparing its output with a single barrel method of production. The results obtained during the test indicated that the efficiency of the equipment based on its output per kg of Cocoa pod husk was 79.9%. It has the capacity to produce 18.3 kg of Biochar from Cocoa Husk per day using lbag ...

Activated Carbon from Agricultural Waste: Process Description and Economic Analysis

Abstract: Adsorption refrigeration technology has been intensively investigated in many countries of the world because of its promising potential for competing with conventional vapour compression refrigeration, its relatively low operating cost and its environmental friendliness. The search for a good adsorbent for solar powered refrigeration technology has led to various attempts to manufacture activated carbon of high adsorptive property. In this study coconut shells plus 10% ani...

Stress Effects on Microstructure and Failure Morphology of Low Carbon Steel Sheet

Abstract This paper presents experimental and simulation study of the effects of stress on microstructure and failure morphology of low carbon steel under plane stress conditions. The study has revealed large extension of grains at the point of fracture and, stress and strain looped around the pearlitic faces of the microstructure matrix. The stress and strain distributions in the microstructure have shown that concentration of stress and strain on the pearlite were instrumental to ...

Artificial Neural Network Predictive Modeling of Uncoated Carbide Tool Wear When Turning Nst 37.2 Steel

ABSTRACT  We report the development of a predictive model based on artificial neural network (ANN) for the estimation of flank and nose wear of uncoated carbide inserts during orthogonal turning of NST (Nigerian steel) 37.2. Turning experiments were conducted at different cutting conditions on a M300 Harrison lathe using Sandvic Coromant uncoated carbide inserts with ISO designations SNMA 120406 using full factorial design. Cutting speed (v), feed rate (f), depth of cut (d), sp...

The Development of CAD Software for Manufacturing Fiat-face and Roller Cam Systems

Abstract Computers have made the greatest impact in the advancement and development of almost all aspect of human endeavour, particularly in the engineering field. In this research, effort is geared towads improving the universal design and final manufacturing of commercial cams in many automotive and other related companies around the world. A software package for the design and profile simulation of plate cams with a possible choice of two followers (Roller and Flat-Face) using eig...

A SURVEY ON THE ENERGY CONSUMPTION AND DEMAND IN A SCHOOL

ABSTRACT Efforts to reduce energy consuniption in domestic buildings and commercial area have been intensified recently in view ofthe limiting ofrhe growing demand for electricity and the efforts to reduce CO2 . Investigations into energy reduction strategies have been extensive with acrive and rigorous researches carried out successfully in many countries of the world. 4 walk-rhrough energy audit was conducted in the School to determine the peak energy demand of the entire School a...

Development and Application of an Inflation-Based Productivity Model

ABSTRACT -The paper presents a productivity model with an inflation component based on an 'established productivity measurement theory. The motivation for writing this paper is the need for conflict resolution at the implementation of productivity incentive programs. A common complaint from trade unions and organizations is that productivity is inaccurately assessed when the traditional inputoutput approach is utilized. The support for this argument is that a general rise in prices o...

Assessment of Large-Scale Motion in Turbulent Boundary Layer Subjected to a Short Roughness Strip

AbstractMeasurements have been made in a turbulent boundary layer which is subjected to a short roughness strip, with the view to examine the influence of short roughness strip on the large scale motion. This is quantified through the analysis of autocorrelation of the fluctuating velocities in the streamwise and wall-normal downstream of a roughness strip. Also, distributions of cross correlation functions are presented. The results indicate that, reference to the smooth wall, there are noti...

VEHICLE SPEED CONTROL USING ROAD BUMPS: PART 2

Abstract In a previous publication in this journal the framework for the development of a model for the road bump problem was laid. The current paper focuses on the aspect of determining the effective distance between two consecutive road bumps developing equations governing the velocity and the wavelength of the motion of the vehicle. The wave equation is re-modelled connecting the isolation factor, linear velocity, wavelength and the frequency of motion of the vehicle over a road b...

Effects of Pipes Corrugated Shapes on the Friction Factor

ABSTRACT Corrugated pipes are pipes with walls of rough surface consisting of dicrete grooves periodicaIly disposed along the flow direction and commonly use in engineering application such as irrigation, delivery devices to main distribution ducts as in transport of Liquid Natural Gas from ships to the mainland distribution network and heat exchanger in heating, ventilation, air-conditioning, etc. The simulation of turbulent, incompressible, isotherminal and single-phase flow is con...

Exergetic Analysis Of Atmospheric Distillation Plant: A Case Study Of Wrpc Refinery

ABSTRACT Exergctic analysis of atmospheric distillation plant of Warri Refinery and Petrochemical Company (WRPC) was conducted to evaluate exergy efficiencies and irreversibilities in each unit of the system with aim of identifying potential areas for improvement. The process simulation was carried out using commercial simulator HYSYS® 2003. The results of the simulation compared reasonably well 'with actual plant process parameters with a relative error of 7.22%, Thchighest irrever...

Performance Analysis Of A Modified Pneumatic Separator For Cowpeas

ABSTRACT In this work, modifications have been done on a prototype pneumatic separator to improve its efficiency. The effects of the modifications were studied by carrying out performance test analyses on the two blowers and reciprocating sieve mechanism which make up the critical components of the separating machine. The variations in the feed weights of the sieve were analysed to determine the best and most effective screening process. Also, the best and least tilt angles of the b...

Fractal Characterization and [so-mapping of Parameter Plane of Harmonically Excited Pendulum

Abstract- This study utilized fractal disk dimension characterization to investigate the system response of a nonlinear, harmonically driven pendulum of mass, m (or weight. W) and length I over a well-defined parameter plane of excitation amplitude versus damping factor. The system response was simulated at three drive ffequencies (symbol,*) of 1/3, 2/3 and 313. A Runge-Kutta fourth order algorithm, coded in FORTRAN programming language was used to simulate the System response over ...


1 - 15 Of 180 Results