Dissertation
Experimental characterization of enhanced boiling and evaporation using IR thermography
Doctor of Philosophy (Ph.D.), Drexel University
Sep 2020
DOI:
https://doi.org/10.17918/00000188
Abstract
Boiling and evaporation, have been an important area of research for decades due to its capability of efficient heat removal. Several methods including surface engineering and fluid modification by adding particles have been used by the researchers to enhance boiling. However, boiling is a complex process and the time and length scale of boiling makes the experimental characterization for fundamental study extremely difficult. This study develops a backside IR thermography and a novel experimental procedure to solve the issues and characterize the evaporation process underneath a bubble. Using a custom-built experimental set up, the study shows the role of nanostructure on liquid film formation and heat transfer enhancement. Further, with detailed experimental visualization the study develops a semi-analytical model to predict liquid film dry out commencement. The study investigates the effects of particle addition to the fluid during boiling on engineered surface. The role of particle addition to the fluid on the evaporation process was studied and particle assisted thin film evaporation was characterized in detail with SiO₂ particles. Also, the study the further investigate the structure particle interaction and its effect on heat transfer performance. The effects of high-density particles (Cu particles) and highly wetting fluid (FC-72) were also investigated by IR based measurement. Finally, the study develops machine learning models to predict critical heat flux (CHF) in advance during boiling with FC-72 on nanostructured tube surface analyzing the images captured during boiling. The study adopts linear SVM, logistic regression model and develops convolutional neural network (CNN) architecture to classify images of different boiling regimes and predict CHF.
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Details
- Title
- Experimental characterization of enhanced boiling and evaporation using IR thermography
- Creators
- Shakerur Ridwan
- Contributors
- Matthew McCarthy (Advisor)
- Awarding Institution
- Drexel University
- Degree Awarded
- Doctor of Philosophy (Ph.D.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Number of pages
- xvi, 178 pages
- Resource Type
- Dissertation
- Language
- English
- Academic Unit
- College of Engineering (1970-2026); Mechanical Engineering (and Mechanics) (1970-2026); Drexel University
- Other Identifier
- 991014695147204721