International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 05 | May -2017
p-ISSN: 2395-0072
www.irjet.net
Modeling and Analysis of Temperature Distribution in the Oven using Computational Fluid Dynamic (CFD)-A Review Vaibhav C. Dhanuskar1, Dr. P. R. Pachghare2 P.G. Student, Department of Mechanical Engineering Govt Engineering College, Amravati, Maharashtra, India Asst. Professor, Department of Mechanical Engineering Govt Engineering College, Amravati, Maharashtra, India ---------------------------------------------------------------------***--------------------------------------------------------------------1
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Abstract - In this paper, the study is focus on the modeling
and analysis of temperature distribution in the oven using Computational Fluid Dynamic (CFD) techniques. In this paper, the CFD analysis of different ovens with varying parameter is presented. The various powder coating processes are studied. The temperature and pressure distribution in the oven plays a dominating role in the product quality. The uniform temperature and pressure distribution is achieved using geometry modification. The effect of perforated inlet to temperature and pressure distribution on the oven is analyzed using CFD simulation. Key Words: PVDF-Poly Vinylidene Fluoride, TGIC, Powder Coating, CFD etc.
1. INTRODUCTION: A coating is a covering which is applied on to the surface of an object which is referred as the substrate. There are two main types of powder coating processes. Liquid Coating Technology (Wet) Powder Coating Technology (Dry) The use of powder coating as a finishing process has grown significantly in the past several years. More and more finishing engineers have turned to powder coating as a way to produce a high-quality finish while increasing production, cutting costs, and complying with increasing environmental pressures. Also, ongoing technological breakthroughs are continually knocking down the few barriers that hindered powder coatings ability to grow in the market. In fact, powder coating now constitutes 15% of the finishing market where it competes directly with traditional liquid finishes. It covers over 10% of the total industrial finishing market.
1.1 Types of Powder Coating Today, powder coatings are available to the industrial finisher in two major types viz. thermoplastics and thermosetting.
1.1.1 Thermoplastic Powder Coating. Thermoplastic coatings do not chemically on the application of heat, but they melt and flow out onto the substrate and continue to have the same chemical Š 2017, IRJET
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composition when it solidifies on cooling. The thickness obtained from these coating films is typically around 250 microns or more. Thermoplastic powder coatings are based on thermoplastic resins of high molecular weight. Typical examples of thermoplastic powder are: Polyethylene: Polyethylene powders were the first thermoplastic powder coatings offered to industry. Polyethylene provides coatings of excellent chemical resistance and toughness with outstanding electrical insulation properties. Polypropylene: As a surface coating, poly propylene offers many of the useful properties it has as a plastic material. Natural polypropylene is inert in nature, it shows very little tendency to adhere to object or other substrates. Nylon: Nylon powders are almost all based on type 11 nylon resin and offer tough coatings that have excellent abrasion, wear, and impact resistance with a low coefficient of friction when applied over a suitable primer. A most interesting use of nylon powder coating is in the field of mechanical design. Polyvinyl: Polyvinyl chloride powder coatings have good exterior durability and provide coatings with a mediumsoft glossy finish. They bond well to most metal substrates when applied over suitable primer. These coatings will withstand the stress of metal fabrication operations such as bending, embossing, and drawing. PVDF (Poly-Vinylidene Fluoride): PVDF based coating materials have excellent weathering characteristics. They also have excellent resistance to chemicals with the exception of hydrocarbon solvents. They are used to coat piping and valves used in chemical process industries. Usually, a chromate primer is recommended.
1.1.2. Thermosetting Powder Coating: Thermosetting powder coatings are quite different from thermoplastic powder coatings; they are based on lower molecular weight solid resins. Subjected to elevated temperatures, these coatings melt, flow, and chemically crosslink within themselves to form a resistant film or with other reactive components to form a higher molecular weight reaction product. The thermosetting powder coating has a different chemical structure than the basic resin. The material formed after chemical reaction are heat stable and will not soften back to its liquid state on further exposure to heat. Powders based on these resin systems can be ground to fine particle sizes, in the range of 25-40 microns. Due to the rheological ISO 9001:2008 Certified Journal
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