Improvement of pool boiling heat transfer is deeply connected to heat enhancement methods for several years. Nevertheless, the developing progress and ideas in this field make it more intensified with the recently applied methods for enhancing the CHF and HTC. This paper gives a critical analysis and thorough investigative study in the literature discussing the passive heat enhancement techniques in the pool boiling heat transfer. Heat improvement consequence within the pool boiling mainly depends on thermo-physical features of material & the working fluid, modification of surface techniques (pin-fins treated, roughness, extended, artificial cavities pattern, micro-channels), thin-film (nano-scale, micro-scale, macro-scale surfaces, and hybrid scale), coating method, working fluid (water or refrigerants) and additives for fluids. The current status of these passive heat enhancement methods for pool boiling heat transfer with various kinds, improvement potentials, future challenges, surface modification techniques, and their potential industrial and technical applications are also examined in this work.
At the age of energy-crisis, enhancement of boiling heat transfer is the most crucial and advanced investigation field. Effects of surface characteristics, specially, surface wettability on pool boiling is yet to understand. Wetting, the ability of solid surface to reduce surface tension of a liquid in contact, can specify by measuring contact angle. Sessile drop method is a very sensitive process to measure contact angle, mainly used for evaluating, comparing and monitoring test surfaces. In this experimentation, a set of copper surfaces are roughened by emery grit size of 600, 1000, 1500 and 2000. Data on surface roughness (generated by AFM and FEG-SEM) and on dynamic contact angle (by macroscopic contact angle (CA) meter) are used to find relation between them. De-ionized water is used as working fluid to protect submerged secondary heater. In this experimentation, it is observed that advancing contact angle grows for surface roughened with higher emery grit-size.
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