Topic
Nucleate boiling
About: Nucleate boiling is a research topic. Over the lifetime, 12078 publications have been published within this topic receiving 254627 citations.
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TL;DR: In this article, the authors considered the forced convection flow of water and ethylene glycol inside a uniformly heated tube that is submitted to a constant and uniform heat flux at the wall.
648 citations
13 Jun 2004
TL;DR: In this paper, the authors compared the performance of nano-fluids with pure water on a smooth horizontal flat surface (roughness of a few tens nano-meters) and showed that nano-particles have poor heat transfer performance compared to pure water.
Abstract: Abstract Boiling heat transfer characteristics of nano-fluids with nano-particles suspended in water are studied using different volume concentrations of alumina nano-particles. Pool boiling heat transfer coefficients and phenomena of nano-fluids are compared with those of pure water, which are acquired on a smooth horizontal flat surface (roughness of a few tens nano-meters). The experimental results show that these nano-fluids have poor heat transfer performance compared to pure water in natural convection and nucleate boiling. On the other hand, CHF has been enhanced in not only horizontal but also vertical pool boiling. This is related to a change of surface characteristics by the deposition of nano-particles. In addition, comparisons between the heat transfer data and the Rhosenow correlation show that the correlation can potentially predict the performance with an appropriate modified liquid-surface combination factor and changed physical properties of the base liquid.
644 citations
TL;DR: In this article, the complex problem of void calculation in different regions of flow boiling is divided in two parts: the first part includes only the description of the mechanisms and the calculation of the rates of heat transfer for vapour and liquid.
637 citations
TL;DR: The high surface tension forces offered by liquids in nanowire arrays made of Si and Cu can be exploited to increase both the critical heat flux (CHF) and the heat transfer coefficient (HTC) by more than 100%.
Abstract: Boiling is a common mechanism for liquid-vapor phase transition and is widely exploited in power generation and refrigeration devices and systems. The efficacy of boiling heat transfer is characterized by two parameters: (a) heat transfer coefficient (HTC) or the thermal conductance; (b) the critical heat flux (CHF) limit that demarcates the transition from high HTC to very low HTC. While increasing the CHF and the HTC has significant impact on system-level energy efficiency, safety, and cost, their values for water and other heat transfer fluids have essentially remained unchanged for many decades. Here we report that the high surface tension forces offered by liquids in nanowire arrays made of Si and Cu can be exploited to increase both the CHF and the HTC by more than 100%.
623 citations
TL;DR: The local heat transfer coefficient, pressure drop, and critical heat flux have been measured for saturated boiling of R-113 in a round tube with an internal diameter of 0.31 cm, and heated lengths of 12.3 and 24.6 cm.
610 citations