Investigation of Flow Charactertics within A Curved Square CShaped Duct
Journal Title: International Journal of engineering Research and Applications - Year 2018, Vol 8, Issue 8
Abstract
This paper presents the observations of an experimental work dealing with the measurement of normalized mean velocity and wall static pressure of a 90° C-shaped curved duct. The test duct is made up of transparent perspexsheet to facilitate the flow visualization study. The duct has a centerline distance of 750mm. The Inlet and Outlet aspect ratio of the test duct used is 1.0. Wall pressures are measured with the help of an inclined manometer withthe inclination of 35°. The manometer had two tubes emanating from it: one left open to the atmosphere and the other connected to the steel pipes attached to the four walls of the curved duct. The difference in the readings helped calculate the static pressure and thereby the normalized pressure. Wall pressure distribution along the curved and parallel walls of the duct at 0°, 22.5°, 45°, 67.5° and 90° measuring sections was measured. The investigation for wall static pressure distribution is carried out at the velocity of 40m/s. This paper also presents an experimental work carried out with measurement of normalized mean velocity of the mentioned curved square C shaped duct, taken at the same velocity. The trend of the normalized mean velocity contour development inside the C duct shows continuous decrease of the normalized velocity as we move from the Inlet Section towards the Outlet Section. The distribution of wall static pressure and normalized mean velocity contours are mapped by using SURFER software package. The trend of wall static pressure development on the walls of C shaped duct shows that as the flow proceeds towards the curvature, there exists a high pressure gradient between the Outside Face and Inside Face due the centrifugal force acting along the curvature. This shows the bulk shifting of flow towards the Inside Face. This is due to the generation of secondary motion in a plane perpendicular to the primary flow. The main purpose of this investigation is to show the development of secondary flow which happens when the flow takes place through the bend in the curvature. This secondary flow arises as a result of a centrifugal force acting when the flow moves through the bend.
Authors and Affiliations
Pramit Khatua, Dipyaman Gangopadhyay, A. K. Biswas, P. K. Sinha
Keywords
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- EP ID EP395054
- DOI 10.9790/9622-0808031015.
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