Paper Title

ALUMINIUM ALLOYS 6061 AND 7075 ARE USED IN 3D MODELLING AND THERMA ANALYSIS OF THE ECONOMIZER IN FIRED BOILERS

Abstract

Economizers are heat exchange devices that are often found in boilers. These devices heat fluids, most commonly water, up to but typically not beyond the temperature at which that fluid would boil. Economizers are given their name due to the fact that they are able to make use of the enthalpy in fluid streams that are hot, but not hot enough to be utilised in a boiler. As a result, they are able to recover more useable enthalpy and improve the efficiency of the boiler. A simulation of the economizer zone is presented in this research. This simulation makes it possible to investigate the flow patterns formed in the fluid as the fluid moves down the length of the economizer. The facts of previous failures reveal that U-bend sections of the Economizer Unit are more susceptible to erosion as a result of an increase in the velocity of flue gas near these bends. However, it has been shown that, unexpectedly, the velocity of the flue gases rises at the lower bends in comparison to the ones that are higher up. The purpose of this thesis is to investigate, using CFD and thermal analysis, how heat is transferred by convection in an economizer while the mass flow rates fluctuate. Copper and aluminium alloys, namely 6061 and 7075, are being evaluated for use in tube construction. The three different mass flow rates that are going to be used are going to be 100, 90, and 70 kg/second. By altering the mass flow rates, a CFD study may be carried out to establish the distribution of temperatures and the rates of heat transfer. In order to determine which material is superior, a heat transfer study is performed on the economizer. CATIA is used for the 3D modelling, while ANSYS is used for the analysis.
KEYWORDS : CFD analysis, economizer, burned boiler, aluminium alloy 6061, and aluminium alloy 7075 are some of the keywords that might be used here.

Paper Title

A MATHEMATICAL MODEL OF THE DETERMINANTS THAT INFLUENCE THE CHOICES MADE BY AIRPORT TAXI DRIVERS

Abstract

In this study, we analyse and study the mechanism of the factors that are related to the decision-making process of airport taxi drivers. Additionally, we take into comprehensive consideration the changing rules of airport passengers and the income of taxi drivers. Finally, we establish a taxi driver selection decision model and give the driver\'s choice strategy..
KEYWORDS : Taxi service at the airport; an analytical hierarchical process; decision-making plans.

Paper Title

AN EXPERIMENTAL INQUIRY INTO BITUMINOUS CONCRETE AND STONE MATRIX ASPHALT-2

Abstract

Stone Matrix Asphalt (SMA) is a gap graded mix that has a substantial proportion of coarse aggregates that are kept together by a rich matrix of filler, fibre or polymer stabiliser in a thick asphalt film. This mix is also known as stone matrix asphalt. SMA is regarded as a premium mix by a number of state departments of transportation for use in regions that experience large volumes of traffic and have circumstances that need regular maintenance that may be expensive. The mixture receives a stabilising component such as cellulose fibre in order to prevent the binder from leaching out of the mixture while it is being transported and placed. In the current investigation, an effort is made to evaluate two different bituminous mixes, namely Bituminous Concrete (BC-2) and Stone Matrix Asphalt (SMA-2). Both of these mixes are referred to as bituminous mixes. Within the context of this project, the additive ARBOCEL-ZZ8/1 serves the purpose of stabilising. In this project, a number of different types of tests, including the Marshall Stability test, the Drain down test, the Indirect Tensile Test, and the Rutting Test, are carried out.
KEYWORDS :