Open Access Method Article

Mathematical Nonlinear Goal Programming in Quality Control

Safia M. Ezzat

Journal of Engineering Research and Reports, Page 1-8
DOI: 10.9734/jerr/2019/v5i116914

This paper concerned with applying suggested mathematical programming and nonlinear goal programming models to determine the producer's risk (α), consumer's risk (β) and acceptance level (c) simultaneously. The suggested nonlinear goal programming model allowed α and β values to be free and determined their values more accurately which make balance between the power of a statistical test (1-β) and level of significance α. Real quality control data are used to evaluate the performance of the suggested models . This enables decision makers in quality control to develop more accurate and free acceptance sampling plans.

Open Access Original Research Article

Validating Visual Modflow Numerical Model to Predict Future Impact of Brine Disposal on Groundwater

Neveen B. Abd El-Mageed, Muhammad A. Abdul-Muttalib, Yasmen A. Heiba

Journal of Engineering Research and Reports, Page 1-9
DOI: 10.9734/jerr/2019/v5i116913

The aim of this research was to simulate the brine disposal fate within an aquifer. The Visual MODFLOW numerical code was used to predict the salt concentration emigration over time in an aquifer. The model was calibrated using laboratory experimental data. The model results revealed that there is an acceptable agreement between the observed and simulated data.

Open Access Original Research Article

Chemical Process Absorption Column Design for CO2 Sequestration

Ikenna C. Nwokedi, Philomena K. Igbokwe

Journal of Engineering Research and Reports, Page 1-14
DOI: 10.9734/jerr/2019/v5i116915

The design of a prototype chemical process absorption column was carried out to facilitate the sequestration of CO2 from flue gas emanating from an exhaust point of a power generating set. Factors such as ambient temperature and atmospheric pressure where factored into consideration before the fabrication of the absorption column. The rate of the absorbing liquid is 0.1056kg/min and contains 5% mole/mole carbon (iv) oxide. Also the energy and material balance of the entire sequestration process was verified as well as the equipment design for the process was carried out.

Open Access Original Research Article

Design, Fabrication and Performance Evaluation of a Domestic Gas Oven

O. E. Ilesanmi, B. O. Akinnuli

Journal of Engineering Research and Reports, Page 1-10
DOI: 10.9734/jerr/2019/v5i116917

This study reports on the design, construction and performance evaluation of a domestic gas oven. The oven was designed and was fabricated with an outer dimension of 860 mm length × 660 mm width × 1150 mm height made up of mild steel and the inner dimension of 759 mm length × 559 mm width × 835 mm height made up of mild steel and fiber glass of 40 mm thickness was used as an insulator to reduce cost to a minimal level. The aim of this research work is to improve on the already existing gas baking oven through the incorporation of a vent/chimney for removal of humid air and roller (wheels) for easy movement. Cooking gas is supplied to the burner located in the lower chamber of the oven via a pipe connection to the gas cylinder. Perforations allow for heat dissipation within the lower chamber. Capacity of the baking oven is 12 loaves of bread of 0.5 kg per bread per tray (batch). Using a temperature regulator and from practical determination, the maximum temperature of 210°C was recorded. The performance test on the oven showed that the efficiency of the oven is of 90.7 percent. The oven can be adapted for both domestic and industrial purposes and have been found very useful in bakery industries. The oven was constructed with locally available materials. Estimated production cost is N56, 470 which is $156.86 at the exchange rate of 360 Naira to a US Dollar as at the time of this design. This can be seen in the Bill of Engineering Measurement and Evaluation (BEME) shown in the report.

Open Access Original Research Article

Prediction of Melting Profile of Mild Steel Weld Metals Using Regression Analysis

Onoriode K. Idiapho, Raphael Biu, William E. Odinikuku, Onomine M. Akusu

Journal of Engineering Research and Reports, Page 1-25
DOI: 10.9734/jerr/2019/v5i116918

The microstructure of a weldment can be maintained by ensuring a steady state homogenous melting profile of the welding operation, which includes the deposition of optimum volumes of melted filler wire and substantial part of the heat affected zones of the parent metal to form the weld pool. The melting pattern of the entire welding process should be protected from atmospheric air, so as to enhance weldment quality. In this study, the melting profile of mild steel is investigated by looking at the parent metal angular distortion bead width and penetration volumes of deposited filler and the melting efficiency was determined. Predictive models were also developed to determine the above listed melting properties by applying the regression analysis. The result obtained showed that, there is almost a perfect fit between the calculated and predicted angular distortion, as well as between the calculated and predicted volume of filler wire melted. There is also a close correlation between the calculated and predicted melting efficiency. However, for the bead width, bead penetration and volume of weld metal deposited, there were variations of values and a heterogeneous correlation between the calculated, measured and predicted values. The effects of the process parameters on the obtained properties of the melting profile were investigated and optimum process parameters were determined.