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Dissertation
Flow field and heat transfer associated with a forward facing step
Doctor of Philosophy (Ph.D.), Drexel University
Feb 1987
DOI:
https://doi.org/10.17918/00009642
Abstract
Numerical studies of the flow field and heat transfer associated with a forward facing step are carried out. A two dimensional incompressible flow is considered and the fluid is of constant properties. Both laminar and turbulent flows are studied. In addition, measurements of the heat transfer over the leading and top plates are conducted in a Ludwieg tube. The power-law numerical scheme, combined with a false transient technique, is applied in a vorticity stream-function approach. In order to overcome numerical difficulties due to the steep gradient of vorticity at the wall, a new approach to the wall vorticity boundary condition is introduced. An algebraic stress model is applied in order to modify the k - (epsilon) model which is employed in the computations for turbulent flow. The flow field may have one or two recirculating regions, depending upon the boundary layer thickness of the approaching flow. The size of the recirculating regions in laminar flow depends on the Reynolds number of the flow. Special attention is given to the configuration of the blunt plate as a particular case of a forward facing step with no leading plate. The heat transfer is enhanced over the top wall and most of the front facing surface. In the turbulent case, enhancement of heat transfer is observed on the leading plate in a limited region near the step. Results of the computational phase are in reasonable to good agreement with the available experimental data. Computed rates of heat transfer are in good agreement with measured data far downstream of the step. Measured data in the neighborhood of the step suggest dependency of the size of the recirculating regions on the Reynolds number. Such a trend is not a characteristic of recirculating regions in turbulent flows and is not detected by the present computations.
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Details
- Title
- Flow field and heat transfer associated with a forward facing step
- Creators
- Amichai Baron
- Awarding Institution
- Drexel University
- Degree Awarded
- Doctor of Philosophy (Ph.D.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Number of pages
- xvii, 220 pages
- Resource Type
- Dissertation
- Language
- English
- Academic Unit
- College of Engineering (1970-2026); Drexel University
- Other Identifier
- 991021888830804721