Thermal Performance Analyses of Concentric Pipe Counter Flow Heat Exchanger at Different Operating Conditions by CFD
A Novel Approach of Turning on Titanium(Ti-6AL-4V) Alloy using NFGMT Coupled with GRA, PCA, and RSM
CFD Analysis on Internally Finned Two Phase Closed Thermosyphon Using Nanofluids
Optimization of Four Wheeler-Disc Brake Rotor Using Couple Field, CFD, Squeal Analysis
Effect of Process Parameters on Surface Finish in Single Point Incremental Forming Process-A Review
A Review on Mechanical and Tribological Characteristics of Hybrid Composites
Design and Experimental Investigation of a Natural Draft Improved Biomass Cookstove
Microwave Cladding: A New Surface Engineering Technique for Developing Uniform Microstructure
Design of Oil-Ammonia Separator for Refrigeration Systems
Development of Solar Powered Vapour Absorption Refrigeration System
Evaluation Of Mechanical Behavior Of Al-Alloy/SiC Metal Matrix Composites With Respect To Their Constituents Using Taguchi Techniques
Isomorphism Identification of Compound Kinematic Chain and Their Mechanism
Multistage Extractive Desulfurization of Liquid Fuel by Ionic Liquids
Development of Electroplating Setup for Plating Abs Plastics
A Comprehensive Review of Biodiesel Application in IDI Engines with Property Improving Additives
This paper optimizes the Wire-Electric Discharge Turning (EDT) process parameters for INCONEL 718 Nickel based super alloy via Taguchi-Grey Relation Analysis. The most significant factor has been identified through Analysis of Variance (ANOVA) technique; subsequently, rotational speed, pulse on time, pulse off time, servo voltage, wire feed rate, and flushing pressure have been chosen as input factors. Metal Removal Rate (MRR) and Surface Roughness (Ra) are considered as response characteristics; thus experiments are conducted according to L18 mixed type Taguchi's orthogonal array. Also the optimal process parameters are evaluated and the results of the confirmation test are validated. Experimental result shows that there is performance improvement by 3.588% and decrement by 9.171% of MRR and surface roughness, respectively. The ANOVA has shown that pulse on time has the most significant effect on MRR and Ra.
Additive Manufacturing (AM) is emerging as an innovative technology distinguished from traditional manufacturing techniques because of its ability to produce complex, fully functioning and end-use products with great design flexibility. This technology is going to have utmost impact on future manufacturing industries. In the present research study, among the seven AM processes, laser based powder bed fusion (L- PBF) or selective laser sintering is gaining more importance due to its capability to process both metals and non-metals starting from metals to polymer and ceramics. Most L-PBF machines are imported and expensive. Hence R V College of Engineering and KCTU (Karnataka Council for Technological Upgradation) - Government of Karnataka have jointly developed an indigenous L-PBF machine, which has been utilized to conduct studies on effect of processing parameters on sintering of iron, silicon carbide, and polyethylene powders. Three key process parameters, laser power, hatch spacing, and scan speed were chosen for this study. The experiments have been conducted according to L9 orthogonal array based on Taguchi methodology of design of experiments adopted to determine the optimum sintering conditions for each of the three materials. Iron powder was optimally sintered with a laser power of 90 W, scan speed of 500 mm/s, hatch spacing of 0.1 mm, at spot size of 0.5 mm. Silicon Carbide powders were sintered with a laser power of 20 W, scan speed of 25 mm/s, hatch spacing of 0.4 mm, at spot size of 1 mm. Polyethylene powders were sintered using a laser power of 22.5 W, hatch spacing of 0.3 mm, Scan speed of 500 mm/s, at spot size of 1.5 mm. The influence of these parameters on energy density was 3 determined. In order to produce iron parts, an energy density of 18 J/mm was required, while in case of Silicon carbide 3 3 parts, it was 21 J/mm and for polyethylene, it was 1.5 J/mm .
This paper elucidates the effect of Minimum Quantity Lubrication (MQL) system on the surface quality achieved during face milling of AISI 1045 steel components over the conventional flooded cooling system. This work was completed in a FANUC arrangement CNC Vertical Machining Centre (VMC) with three TiN coated carbide inserts of 0.4 mm nose radius adjusted into a face milling cutter of 25 mm in diameter. The machining parameters considered in this investigation are 4 number of passes, depth of cut, spindle speed, and feed rate. The experiments were planned based on Taguchi's L (3 ) 9 orthogonal array. The surface roughness of the machined components is measured using a surface roughness tester and subsequently, a mathematical model is developed for the average surface roughness values through regression analysis for both the machining conditions. The significance of the selected machining parameters and their levels of surface roughness are found by Analysis of Variance (ANOVA). The results revealed that machining under MQL condition provides better product surface quality than the machined product surface quality under flooded condition.
The experimental work carried out gives an idea of utilizing the recovered energy from the domestic pressure cooker for converting the steam power released at high pressure into the other form of electric power with the self-prepared setup. In this concept, the method of saving energy by means of recovering, and using of insulator for reducing the heat losses are applied. The reduction of time of heating is achieved by copper coating at the bottom of the pressure cooker, which helps the heat transfer from the burner to the sterilizer vessel fastly, so that the loss of heat from the burner to the vessel and overall heat losses in the entire setup are optimized to run the experiment successfully. The setup not only converts the energy, but also helps to minimize the time of cooking and reduction of fuel usage, as it is the major requisite in our day to day life for cost minimization too. The combination of reducing the enthalpy losses through steam and guiding the pressure of dissipated steam on to the turbine is carried out for achieving the aim of the work.
During the last few decades, building designs for all kinds of high occupancy spaces, such as hotels, shopping centers, hospitals, stadia, and airport terminals have undergone significant changes, in order to meet the ever-increasing demand for efficiency, comfort and safety in case of emergencies in larger and ever more complex projects. Computational Fluid Dynamics (CFD) simulations have proven to be a flexible and effective numerical tool for developing, optimizing and validating tailored solutions in increasingly complex and demanding projects. At Dar Al- Handasah (Shair and Partners), an architecture and engineering design firm founded in 1956, and a pioneering force in the planning, design and implementation of development projects in the Middle East, Africa and Asia, these CFD simulations are extensively used at an early phase in the design process to support the design. Indeed, simulations are used as an optimization and validation tool to develop innovative designs incorporating energy-saving and safety measures geared toward decreasing the overall facility's energy costs, while improving occupant comfort and safety. This paper will showcase the use of CFD simulations using ANSYS FLUENT in the design and optimization of Heating, Ventilation, and Air-Conditioning (HVAC), and smoke management systems for a typical high-ceilinged and high-density assembly space. Specifically, the simulations are used to predict local conditions, such as flow field, temperature and relative humidity distributions and optimize HVAC design parameters, such as supply air flow and size/distribution of outlets to maintain a comfortable thermal environment in normal mode of operation. In case of an emergency fire event, the simulations will help visualize the spread of smoke and optimize the emergency ventilation parameters to avoid causalities and ensure the safe evacuation of occupants in compliance with applicable international fire and life safety codes.
Decision to install and commission a modern lift or an elevator in institutional, commercial, or residential building has been considered to be a challenging task. The project assignment does not only involve a multidisciplinary expertise, but also requires permissions and approvals from various government and private authorities like Municipal Corporation, Public Works Department (PWD), Architect, Structural Engineer, etc. Despite the vast, wide spread of the intricacies of the topic, this article intends to provide the readers with some general and a few detailed important factors while making decisions towards lift installations. Numerous options of elevators are available in the market with different qualities and costs, which make the selection process a difficult task. Selecting a lift signifies to be a Multi-criteria Decision Making (MCDM) problem and it is illustrated that the decision can be effectively addressed by Analytical Hierarchy Process (AHP). The article intends to present some useful tips that can be adopted while installing the elevators to the technical decision makers.
There is a need for the growing generation to find new and alternate energy sources instead of conventional depleting energy resources. The increasing environmental pollution due to conventional fuels has taken interest to search for new alternative sources that are environmental friendly and can replace the conventional fuels such as biodiesel. The biodiesel can best and efficiently produced using waste cooking oils. Waste cooking oils generally we get from restaurants are commonly just thrown away. Those oils do not have any treatment first, and it pollutes the environment. One of the ways to treat the waste oil is by converting it to biodiesel. The main aim of this review is to show the comparative study of production of biodiesel by the transesterification reaction of waste cooking oil and various modern refining processes to refine the biodiesel. The biodiesel is obtained by reacting waste cooking oil along with alcohol in the presence of NaOH or KOH as base catalyst.