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Title: An investigation of turbulent swirling flow with heat transfer
Author: Chang, T.-H.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1991
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A detailed investigation of swirling flow in an axisymmetric pipe has been undertaken and the findings from both an experimental and analytical research programme have been reported in this thesis. The study was divided into two sections, firstly that concerning isothermal flow, before extending it to account for heat transfer resulting from swirling flow within a heated pipe. An experimental test-rig was manufactured to permit a detailed interrogation of all flow variables. The rig incorporated a specially designed swirl generator, fitted to the inlet of a perspex circular pipe, enabling varying intensities of swirl flow to be stimulated over a Reynolds number range of 20-60 x 103. An identical pipe, manufactured out of copper, enabled a constant heat flux to be applied at its outer surface, thereby permitting a corresponding investigation of the heat transfer phenomena. An analysis of the above flow regimes was undertaken through the solution of the equations of flow and the one-equation (k-1) model together with corresponding boundary conditions, for depicting isothermal turbulent flow with swirl. For the heat transfer analysis, a solution of the energy equation with its appropriate boundary conditions was included. The solution of the mathematical model was effected by using the finite element method and discretising in three dimensions over the domain. The effect of increasing the swirl intensity results in a migration of the locus of the points of maximum axial and tangential velocity towards the pipe wall. This is accompanied by higher heat transfer rates for a constant surface heat flux. The analysis has provided a viable technique for predicting turbulent flow with low swirl intensities, exhibiting good comparisons with the experimental results over much of the flow field. The main discrepancy occurred in the region of flow reversal, where the analysis is underpredictive, a consequence of the limitation of the one-equation model in accounting for momentum transport across the boundary of zero velocity.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available