Executive Summary : | Boiling heat transfer is a complex system influenced by various mechanisms, including bubble inception, growth, and collapse, nucleation site density, and changing bubble-surface and bubble-liquid behavior. This complexity affects the design of boilers, heat pipes, heat exchangers, and smart cooling systems. The thermophysical properties of pure and conventional fluids further complicate the boiling mechanism, especially in chemical, petrochemical, and food industries. This work focuses on investigating essential processes related to nucleate pool boiling (NPB) over different types of heat transfer surfaces submerged in a liquid pool with pure or mixture of fluids under various pressure fields. The base fluids include pure water, ethanol, oil, ethylene glycol, and their mixtures. The influence of nanoparticle dispersion in base fluids at various concentrations will also be considered. The best combination of heat transfer surface and base fluids will be considered for experiments under varying pressure fields. Bubble dynamics parameters and thermal field distribution will be mapped instantaneously using the proposed non-intrusive RI-based whole field imaging technique of rainbow schlieren deflectometry. This optical technique extracts spatiotemporal data for temperature distribution and helps monitor the progress of vapor bubbles and collapse in the liquid pool. The extracted temperature distribution data will be used to calculate heat transfer rates and quantify the relative contribution of various heat transfer mechanisms in NPB. A numerical study will verify experimentally obtained thermal contour data and bubble growth dynamics. Performance evaluation and comparative studies of proposed fluid systems will be conducted over micro-scale particle-particle, particle-liquid interactions. |