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Experimental investigation of pressure losses and flow characteristics in bend-diffusers by means of installing turning baffles

Nordin , Normayati and Othman, Safiah and R.Raghavan, Vijay and Mohideen Batcha, Mohd Faizal and Idris, Siti Mariam (2011) Experimental investigation of pressure losses and flow characteristics in bend-diffusers by means of installing turning baffles. In: 2nd International Conference on Mechanical Engineering (ICME 2011) , 6-7 June 2011, Putrajaya.

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Abstract

A combined bend-diffuser is often used either as an ejector or an adapter in a duct line. Flow within a bend-diffuser is complex to be judged, thus susceptible to losses. In this study, turning baffles were used particularly to improve the overall performance of system in terms of pressure losses reduction and flow uniformity. The mechanisms of pressure losses and flow characteristics in a bend-diffuser with and without turning baffles were experimentally investigated. Bend-diffusers with and without baffles of 90o bend angle and area ratio (AR) of 7.2 were considered. Static pressure and air velocity were measured using pitot static probe and digital manometer with accuracy of 0.1Pa by traversing. Three stations, i.e., before bend (S1), before diffuser (S2), and after diffuser (S3) with two planes each were considered for measurement. Pressure losses coefficients obtained for a bend-diffuser without baffle were Kbend(w/o), 1.249 and 1.145 for (a) and (b) planes respectively, Kdiffuser(w/o), 1.290 and 0.578 for (a) and (b) planes respectively and Ksystem(w/o), 1.306 and 1.746 for (a) and (b) planes respectively. For a bend-diffuser with baffle, Kbend(with), 0.227 and – 0.351 for (a) and (b) planes respectively, Kdiffuser(with), 2.899 and 1.275 for (a) and (b) planes respectively and Ksystem(with), 0.573 and -0.134 for (a) and (b) planes respectively. The baffles installed in a bend-diffuser is proven to improve the overall system performance in terms of pressure losses reduction, however, further efforts should be taken to impro vve flow uniformity.

Item Type: Conference or Workshop Item (Paper)
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ1-162 Mechanical engineering and machinery
Divisions: Faculty of Mechanical and Manufacturing Engineering > Department of Plant and Automotive Engineering
Depositing User: Mrs. Normayati Nordin
Date Deposited: 12 Dec 2013 06:57
Last Modified: 12 Dec 2013 06:57
URI: http://eprints.uthm.edu.my/id/eprint/4596
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