Interfacial energies of aqueous mixtures and porous coverings for enhancing pool boiling heat transfer

Meléndez, Elva; Reyes, R.

doi:10.1016/j.ijthermalsci.2005.11.005

Cited by 5 publications

(2 citation statements)

References 21 publications

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“…Therefore, coalescence of small embryos into larger bubbles is inhibited, bubble frequency is increased, dryout on the heated surface is reduced, and the critical heat flux condition is delayed (Hahne and Grigull, 1977). Meléndez and Reyes (2006) measured the interfacial energies effects on pool boiling for combinations of aqueous ethanol mixtures and a surfactant (sodium laurylsulfate) and concluded that, under proper conditions, the transport of minute concentrations of a surface active substance in a pure substance, or the lower vapor-pressure substance in a binary mixture, modifies the interfacial energy and the boiling characteristics significantly. Effect of the addition of MEA and DEA to water on the surface tension of mixture has been presented in Figure 7.…”

Section: Effect Of Surface Tensionmentioning

confidence: 99%

Experimental and theoretical study of pool boiling heat transfer to amine solutions

Peyghambarzadeh

Jamialahmadi

Fazel

et al. 2009

Braz. J. Chem. Eng.

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Abstract-In this investigation, a large number of experiments have been performed to measure the nucleate boiling heat transfer coefficients of water/diethanolamine (DEA) and water/monoethanolamine (MEA) binary solutions. Based on these experimental data, effects of physical properties such as surface tension and viscosity of mixtures on nucleate boiling heat transfer coefficients and also on bubble dynamics have been discussed. Meanwhile, some photographs have also been selected which illustrate the behaviours of bubbles near the heat transfer surface. In this article, a new correlation has been developed on the basis of the correlation of Stephan and Körner which is known as a successful correlation for the prediction of nucleate boiling heat transfer coefficients of mixtures. Comparison of the prediction of this new correlation with experimental data indicates that this modification can significantly improve the performance of the Stephan and Körner correlation.

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Section: Effect Of Surface Tensionmentioning

confidence: 99%

Experimental and theoretical study of pool boiling heat transfer to amine solutions

Peyghambarzadeh

Jamialahmadi

Fazel

et al. 2009

Braz. J. Chem. Eng.

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“…These methods include (1) adding irregular surface roughness like microporous structures by adding microsized particles (Rainey and You 2001;El-Genk and Parker 2005) and machining (Jiang et al 2001), (2) adding regular microstructures like fins (Wei et al 2005;Mitrovic and Hartmann 2004;Ramaswamy et al 2002;Hubner and Kunstler 1997) and micro-cavities (Rajulu et al 2004;Chatpun et al 2004;Shoji and Takagi 2001), and (3) adding double enhanced microstructures by combinations of microstructures and microporous coating or surface roughness (Bahrami et al 2005;Rainey et al 2003). In addition, there were also studies performed on heater orientation (Yang et al 2006), bubble dynamics (Murthy et al 2006), surface tension (Melendez and Reyes 2006), etc.…”

Section: Introductionmentioning

confidence: 99%

Using bulk micromachined structures to enhance pool boiling heat transfer

Zhang

Lian

2008

Microsyst Technol

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This paper presents the important results of enhancing the boiling heat transfer of the pressurized water reactors (PWRs) by using LIGA or LIGA-like techniques to add microstructures on the surface of heater elements. The heater elements were made of 10 mm 9 80 mm silicon strips with different in-line square micropin-fin configurations of 200 lm fin width, 35 lm fin height, and different inter-fin spacing values of 200, 400, 600, 800, 1000 lm and infinity. The experiments were conducted in de-ionized water at the atmospheric pressure. The input power, heater temperature, steam generation rate and video images of boiling phenomena were continuously recorded. Their relationships was studied and used to evaluate the total boiling heat transfer performance. The optimized microstructures can then be massfabricated on PWR tubes by using LIGA or LIGA-like technology. The experimental results suggest that by adding micro-sized in-line pin-fin arrays on heater surface and modifying heater surface morphology, the boiling process can be greatly enhanced through the improvements of vapor nucleation and vapor evolution processes at heater surface, which yields a low wall superheat and achieves a higher boiling heat transfer efficiency. The video images showed that the bubble nucleation sites are located immediately on top of each micro-pin fins. At current experimental setup, the 200 lm-spacing heater has the highest steam generation efficiency.

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