Experimental study of flow in a plenum chamber of a swirling fluid bed

Othman , Safiah and Nordin, Normayati and A. Wahab, Abas and R. Raghavan, Vijay (2011) Experimental study of flow in a plenum chamber of a swirling fluid bed. In: 2nd International Conference on Mechanical Engineering (ICME 2011) , 6-7 June 2011, Putrajaya.

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Abstract

In the present study an experimental system is constructed for verification of the numerical approach used in designing the plenum chamber of a swirling fluidized bed. The airflow entering the plenum chamber is measured by a pitot static probe inserted into the inlet pipe of the chamber. Static pressure tapings are provided at two planes on the plenum chamber in order to obtain the pressure drop across it. Particle Image Velocimetry (PIV) is used to visualize the flow and provide 2D quantitative information about the velocity field. From the resulting outputs, the pressure drop across the plenum without a cylindrical hub implanted at the centre was found to be higher than with it. Although the existence of hub increases the viscous friction due to more area in contact with fluid, the more pronounced form drag caused by the abrupt flow expansion in the empty bed is greatly reduced in the column with hub. Furthermore, elimination of losses near a wide region at the column center give the latter set up an advantage with respect to pressure loss. As a result, less pressure drop across the chamber with a hub incorporated is of evident. Also obtained are the 2-D airflow vectors in the plenum chamber as captured using PIV apparatus. The flow vectors are essential in understanding the general aerodynamics in the test unit. In addition, computational software could provide the velocity magnitudes of the flow. These data are essential to validate the numerical codes.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:experimental study; plenum chamber; swirling fluidized bed; validation; PIV
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
ID Code:4602
Deposited By:Mrs. Normayati Nordin
Deposited On:12 Dec 2013 14:40
Last Modified:12 Dec 2013 14:40

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