Experimental study for determining the mass transfer coefficient under two-phase flow boiling condition Open Access
- Other title
- Type of item
- Degree grantor
University of Alberta
- Author or creator
- Supervisor and department
Luo, Jing-Li (Chemical and Materials Engineering)
- Examining committee member and department
Cheng, Frank ( Schulich School of Engineering, University of Calgary)
Thundat, Thomas (Chemical and Materials Engineering)
Hayes, Robert E. (Chemical and Materials Engineering)
Semagina, Natalia (Chemical and Materials Engineering)
Department of Chemical and Materials Engineering
- Date accepted
- Graduation date
Doctor of Philosophy
- Degree level
The mass transfer is an important phenomenon associated with a wide range of problems in the nuclear industry, such as materials degradation of components and fouling of heat exchangers and steam generators. However, mass transfer under a two-phase flow boiling condition has not been successfully investigated using direct experimental approach due to experimental difficulties. To fulfill the knowledge gap in this area, the objective of this project is to develop a novel experimental device and measurement technique to investigate mass transfer rate under the flow boiling condition. Because of the challenges associated with research in this area, the current study has been divided into three phases: (I) a bulk boiling condition, (II) a pool boiling condition and (III) a two-phase flow boiling condition. In Phase I, a rotating cylinder electrode system was employed to mimic the flow condition, and the electrolyte was heated to obtain the bulk boiling condition. The mass transfer behavior of oxygen and ferricyanide were determined from room temperature to just below the boiling point (i.e. 99 C) for rotating speeds between 100 and 3300 rpm. A correlation was successfully developed to predict the mass transfer behavior for the dissolved oxygen reduction and ferricyanide reaction below the boiling condition. However, the experimental data obtained under bulk boiling conditions was on the average 38% higher than the predicted data due to the generation and rupture of boiling bubbles in the bulk solution. In Phase II, a novel pool boiling setup was designed and constructed to study the mass transfer behavior on a nucleate boiling surface at atmospheric pressure. This study made a valuable contribution to the existing knowledge of mass transfer study on nucleate boiling surface because it is the first successfully attempt according to the open literature. Potassium ferricyanide and hydrogen peroxide were used as the non-volatile and volatile reaction species, respectively. It was found that under subcooled nucleate boiling and fully developed nucleate boiling conditions, the mass transfer coefficient increases with the increasing electrolyte temperature and heat flux for both species. The increase for hydrogen peroxide was faster than that for potassium ferricyanide due to the transfer of hydrogen peroxide ions through both the liquid and vapor phases during the reaction. In addition, an empirical correlation was proposed to include the bubble induced micro-mixing and macro-mixing effects, which occurred during boiling and was proven to agree well with our experimental data. In Phase III, a novel high temperature and pressure experimental flow loop and measuring technique were developed to determine the mass transfer rate under the flow boiling condition. The experimental setup and measuring technique enabled us to study the mass transfer behavior under the flow boiling condition to a level that no one else has been achieved according to open literature. The mass transfer coefficients were determined experimentally for the first time using this flow loop. An empirical correlation was proposed to represents our experimental data within 10% error. This work will provide a good base for further flow boiling mass transfer studies.
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- Citation for previous publication
Shen, C., A. Afacan, J.-L. Luo, A. Siddiqui, and S.J. Klimas, "Mass Transfer of Diluted Volatile and Nonvolatile Components to a Nucleate Boiling Electrode," Corrosion, 2015. 71(8): p. 1003-1011.Shen, C., A. Afacan, J.-L. Luo, S.J. Klimas, and A. Siddiqui. "Mass Transfer of Diluted Non-Volatile Component to a Boiling Electrode." in CORROSION 2015. NACE International.Shen, C., A. Afacan, J.-L. Luo, A. Siddiqui, and S.J. Klimas, "Mass transfer on nucleate boiling surfaces using the electrochemical method," International Journal of Heat and Mass Transfer, 2014. 78(0): p. 289-293.Shen, C., A. Afacan, J. Luo, and S.J. Klimas, "Mass transfer of dissolved oxygen using rotating cylinder electrode under bulk boiling conditions," International Journal of Heat and Mass Transfer, 2014. 70(0): p. 162-168.
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