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An ansys cfx simulation on the study of 2 different automotive spraying techniques modeled with reference to 2 different spray angle

Yeoh, Poh See (2015) An ansys cfx simulation on the study of 2 different automotive spraying techniques modeled with reference to 2 different spray angle. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Conventional automotive spray gun is widely used in the automotive industries for coating and is especially popular among small and medium industries due to its low cost and maintenance. However studies showed that it also causes overspray of paint that affect the hygiene factor concerning health and less cost effective when usage of spray is not properly utilized. Various methods have been used to study the efficiency of the spray through simulation software and lab approach. In this work, the simulations of the spray paint are performed from the air cap of the spray gun and continue until the flat spray surface. The simulations are performed using ANSYS CFX Version 14.5 based on the Taguchi method. The Taguchi method used in this study implemented the L’9 orthogonal array, since this case study consists of 3 level and 3 factor. This simulation utilize paint as a non-Newtonian fluid taking into consideration the concentration of paint as the additional variable in [kg/m3], air velocity at the inlet of atomizer, spreader and paint inlet and lastly the recommended distance (200mm to 250mm) and spray angle (90° to the spray surface area) as suggested by the spray manufacturers. Results show that the spray angle is perpendicular to the surface area, the spray pattern has a better concentration of paint compared to when the angle is arced 45° from the spray surface. Furthermore, at arced 45° from the spray surface, the overspray can be seen over the intended spray surface. The most desired simulation result was achieved with, air velocity 1 m/s, paint velocity 2 m/s at a distance between air cap and spray surface is 200 mm.

Item Type: Thesis (Masters)
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ1-162 Mechanical engineering and machinery
Depositing User: Mrs Hasliza Hamdan
Date Deposited: 14 Apr 2016 06:35
Last Modified: 14 Apr 2016 06:35
URI: http://eprints.uthm.edu.my/id/eprint/7861
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