1. UKM Learning and Research Repository
2. Master Thesis / Tesis Master
3. Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina

Title:	Heat transfer mechanism in oscillatory baffled column
Authors:	Wah Keng Sern. (P49943)
Supervisor:	Mohd. Sobri Takrif, Prof. Ir. Dr.
Keywords:	Fluid dynamics.
Issue Date:	22-Aug-2011
Description:	Oscillatory flow in a baffled column (OBC) has excellent potential for industrial applications. Among its main advantages are having excellent mass and heat transport properties while maintaining the plug flow conditions. Uniform, efficient and controllability of the heat transfer are the general requirements of the industrial processes. Heat transfer research conducted in the OBC were limited only to a jacketed heating system and lacked in the more detailed information on the heat transfer mechanism aspect. Computational fluid dynamics (CFD) facilitates the understanding of the dynamic heat transfer in the OBC. However, the CFD studies of the OBC are limited to dynamic fluid flow only. In this study, a commercial CFD software, FLUENT ® 6.3 was used to study the dynamic of the heat transfer that was associated with the fluid flow behaviour in the OBC. A 3-dimensional OBC model with a diameter of 0.16 m and height of 0.724 m was created with pre-processing software, GAMBIT ® 2.4, to simulate the dynamic fluid flow behaviour and heat transfer phenomena. A shear stress transport (SST) k-omega turbulence model in transient mode was used to predict the chaotic flow in the OBC. A user defined function (UDF) was developed to model the sinusoidal movement of piston in the OBC. The capability of the clamped heaters as an alternative heating means in OBC was also investigated. Temperature profile at four designated locations were monitored in the CFD simulations and validated by a set of the experimental results. A series of results obtained from the CFD simulations showed that the oscillatory flow pattern was the main factor that governed the heat transfer in OBC with clamped heaters. In addition, the gradual increment of the fluid temperature in OBC indicated an efficient heat transfer. Three units of clamped heaters located at the centre of each compartment offered the most efficient heating where energy and cost savings go hand in hand. Apart from that, the heat transfer phenomena in the OBC with piston heater and clamped heater were also studied through the development of a linear relationship of the heat transfer in the piston heater. It was found that a greater heat transfer could be well achieved by controlling the operating parameters i.e. the oscillation amplitude and the oscillation frequency. As the oscillatory Reynolds number increased, the Nusselt number increased simultaneously. The combination of the oscillatory amplitude at 0.01 m and the oscillatory frequency at 1.0 Hz were required to achieve a uniform heating in the OBC system studied. A 30% heat enhancement achieved by the controlling oscillation amplitude over that of the oscillation frequency also indicated that the oscillation amplitude was the key operating parameter that governed the heat transfer in the OBC with clamped heaters system.,Master
Pages:	157
Call Number:	TA357 .W334 2011 3
Publisher:	UKM, Bangi
Appears in Collections:	Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.