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Dissertation
Transport processes in liquid baths and gas/liquid interfaces due to impinging gas and plasma jets
Doctor of Philosophy (Ph.D.), Drexel University
1996
DOI:
https://doi.org/10.17918/00000608
Abstract
Impinging gas or plasma jets on molten metal are commonly encountered in such processes as BOF (Basic Oxygen Furnace) and electric arc furnace steelmaking. Understanding the mechanism of transport phenomena, such as heat and mass transfer associated with the oxygen jet (in the BOF) impinging on molten metal and the arc jet (in the electric arc furnace), is important for process optimization. The interface shape is important because it determines the interaction of the metal bath with the surroundings. Using a physical model consisting of water and air, the liquid surface deformed by the impinging gas jet was characterized in the experiments. A computational model was also developed to predict interface deformation, the flow field in the gas jet, and the shear driven flow field in the liquid bath. To simulate the slag/metal layers as found in the BOF and the electric arc furnace, water/corn oil and water/kerosene combinations were used in the physical modeling studies. The influence of physical properties of the two liquids on the interface shape and flow fields was studied under various impinging jet conditions. An existing phenomenological model for the penetration depth was extended for small jet exit height to jet diameter ratios. Heat transfer from a liquid bath due to an impinging gas jet has also been investigated. Both numerical calculations and experiments were utilized to characterize the heat transfer from impinging jet on a liquid bath. Air jets with liquid baths of silicone oil, liquid metal (Amalloy-203) and water were modeled. The thermal behavior of the bath was characterized as function of jet characteristics and bath liquid properties. A numerical model was also developed to characterize transport processes for impinging arc jets on solid metal surfaces. The heat transfer from the arc to the metal surface was calculated. Computational results were obtained for varying arc current magnitudes and anode-cathode distance. Shorter arc length is shown to be more efficient for transferring heat to the anode.
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Details
- Title
- Transport processes in liquid baths and gas/liquid interfaces due to impinging gas and plasma jets
- Creators
- Feng Qian
- Awarding Institution
- Drexel University
- Degree Awarded
- Doctor of Philosophy (Ph.D.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Number of pages
- xix, 193 pages
- Resource Type
- Dissertation
- Language
- English
- Academic Unit
- College of Engineering (1970-2026); Mechanical Engineering (and Mechanics) [Historical]; Drexel University
- Other Identifier
- 991014970324404721