Abstract
In this paper, a review of the impact of most common nanoparticles on the Leidenfrost temperature TLeid in heat transfer applications is delivered. Moreover, a simple economic analysis of the nanoparticles use is proposed. When coolant is distilled water, TLeid can range 150–220 °C; occasionally, it can even amount to over 400 °C. When the base liquid is modified by additives, considerable changes in the character of heat transfer are observed. Out of five nanofluids under consideration in this study, the best thermal effect (up to 50%) is obtained when Al2O3 nanofluid having particle sizes ~39 nm and volume concentration of 0.1% is used. Conversely, the fluid containing TiO2 particles, 20–70 nm in size, seems to be the worst of the analysed fluid, giving only 7% heat transfer enhancement in comparison with water. However, when TiO2 nanoparticles are far smaller, very good thermal effects are obtained (23–25%). In a majority of the cases analysed, the temperature that marks the onset of film boiling is inversely proportional to concentrations of nanoparticles, which is relevant from the economic standpoint.
Highlights
Liquids most commonly used in heat transfer systems so far are water and ethylene glycol
The major objective of the paper was to emphasise the differences in heat transfer performance in the nanofluid systems in which stable film boiling of the coolant occurs
Leidenfrost temperature indicates that the liquid has reached its critical point
Summary
Liquids most commonly used in heat transfer systems so far are water and ethylene glycol. Due to relatively low thermal conductivity, they do not ensure fast and effective heat transfer necessary in modern equipment used in thermal engineering. Different requirements are posed for the equipment. It is usually extremely difficult, or even impossible, to fully meet those requirements. Values of some parameters can be modified by additives of different type. Change in properties can be achieved by small, pre-determined inclusions. Substances with additives form solutions or suspensions
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
