Nucleate pool boiling curve hysteresis for GEWA-T surfaces in saturated R-113

doi:10.1016/0894-1777(90)90093-M

Experimental Thermal and Fluid Science

Volume 3, Issue 2, March 1990, Pages 249-255

https://doi.org/10.1016/0894-1777(90)90093-M Get rights and content

Abstract

Nucleate pool boiling tests were performed on a number of GEWA-T deformed low fin surface copper tubes in saturated R-113. The gap width, S_T, varied between 0.15 and 0.55 mm. A smooth tube was also tested for reference.

The boiling curves for each test section exhibited the hysteresis effect commonly observed with liquids of high wettability; however, the largest thermal excursions or temperature overshoots observed were only 1.5–3.3 K. This is much lower than reported for other enhanced surfaces tested under similar conditions. The small excursions are the result of enhanced free convection and the difficulty of spreading the boiling, both effects being attributed to the re-entrant helical channels.

References (9)

A.E. Bergles
Application of Heat Transfer Augmentation
T. Torii et al.
The Use of Heat Exchangers with THERMOEXCEL Tubing in Ocean Thermal Energy Power Plants
ASME Paper No. 78-WA/HT-65
(1978)
A.E. Bergles et al.
Characteristics of Nucleate Pool Boiling from Porous Metallic Coatings
J. Heat Transfer
(1982)
P.J. Marto et al.
Pool Boiling Heat Transfer from Enhanced Surfaces to Dielectric Fluids
J. Heat Transfer
(1982)

There are more references available in the full text version of this article.

Cited by (11)

Pool boiling heat transfer of ammonia outside a single tube with fin structures: Hysteresis phenomena and boiling enhancement
2023, International Communications in Heat and Mass Transfer
Pool boiling heat transfer of ammonia outside a single tube was investigated at three saturation pressures of 6.15, 8.57, and 11.7 bar (saturation temperature of 10, 20, and 30 °C) at the heat fluxes ranging from 1.2 to 72.9 kW/m². Hysteresis in a boiling curve and boiling enhancement were examined on both the smooth tube with machined roughness and two enhanced tubes with low fins and re-entrant cavities. All three tubes have outermost diameters from 15.68 to 15.87 mm and the same length of 796 mm. A large hysteresis between increasing the heat flux and decreasing the heat flux was observed on the smooth tube, and the hysteresis increased as the saturation pressure decreased. The boiling hysteresis of ammonia was reasonably explained from the thermodynamic analysis based on Clausius-Clapeyron and Young-Laplace equations. Heat transfer coefficients on the enhanced tubes were increased by 47% to 105% (Low-fin) and 103% to 159% (Turbo-E) compared with the smooth tube at the saturation pressure of 8.57 bar. However, the hysteresis itself was increased on the enhanced tubes owing to the wall temperature decrease along the fin. Hydrophobic coating and the enhanced tube having re-entrant cavities with cavity mouths of a few micrometers were suggested to mitigate the hysteresis phenomena in the pool boiling of ammonia.
Experimental analysis on the hysteresis phenomenon during flow boiling heat transfer in a horizontal stainless-steel tube
2021, International Journal of Heat and Mass Transfer
Citation Excerpt :
The same observation was described by Vasiliev et al. [21] during pool boiling of propane. Several researchers focused instead on the possibility to reduce or eliminate the temperature overshoot and in general the hysteresis effect during stable boiling with particular surface treatments, such as re-entrant cavities [22], or hydrophobic coatings with both experimental [23] and numerical [24] studies. The experimental campaign has been carried out with a test facility located in the Refrigeration Laboratory at the Università degli Studi di Napoli Federico II.
This paper presents an experimental analysis on the hysteresis phenomenon occurring during flow boiling heat transfer in a horizontal stainless-steel tube having an internal diameter of 6.0 mm. Pure R134a is the working fluid employed, working at a saturation temperature and a vapor quality fixed to 40°C and 0.30, respectively, whereas two different mass velocities of 400 and 800 kg/m²s are studied. A dedicated experimental procedure has been carried-out to highlight the variation of the two-phase heat transfer performance due to the hysteresis effect. Specifically, tests performed at the same operating conditions but having a different thermal history (a higher imposed heat flux in the transient phase) were seen to provide lower wall superheat values and therefore higher heat transfer performances.
The nucleate boiling contribution is isolated from the overall heat transfer and the parameters affecting the boiling curve behavior are highlighted and discussed, pointing out the differences when increasing and decreasing the imposed heat flux once a peak value is reached. The experimental trends are finally upheld by the boiling theory, considering the hysteresis effect as the activation of the surface cavities undergone a higher given thermal boundary condition.
Review of two-phase flow instabilities in macro- and micro-channel systems
2020, International Journal of Heat and Mass Transfer
Citation Excerpt :
As vapor burst is (when it manifests) a byproduct of boiling curve hysteresis, boiling curve hysteresis will be discussed first. Boiling curve hysteresis commonly occurs with low contact angle combinations of fluid and heated surface in a variety of boiling configurations [176-188], and may be simply described as resulting from difference in wall superheat required for nucleation to begin versus that at which it ends (it takes a higher wall superheat to start nucleation than the heat flux wall superheat at which nucleation ends). The main culprit for hysteresis is flooding of surface cavities by low contact angle fluids, which deprives the cavities from viable vapor embryos capable of initiating the bubble nucleation.
Study of two-phase flow instabilities began in the late 1920′s, and in the nearly 100 years since, significant progress has been made in both experimental and theoretical understanding of them. Despite these advances, many key deficiencies remain, solution of which will provide appreciable value for system designers looking to leverage phase change heat transfer technologies in a safe and repeatable manner. The present review provides a systematic overview of all key two-phase instabilities focusing on the fundamental mechanisms leading to their occurrence. Emphasis is placed on how these mechanisms may change depending on whether flow may be classified as macro- or micro-channel, particularly relevant due to the modern proliferation of parallel micro-channel heat sinks. Extensive literature surveys are performed for each instability type, and strengths and weaknesses of existing literature assessed. Focus is placed on providing recommendations for future work based on the status of current literature. Important takeaways include the significant mechanistic differences for Density Wave Oscillations and Parallel Channel Instability between macro- and micro-channels, the need for better understanding of the role of parallel micro-channels on external pressure curves (impacting Ledinegg instability and Pressure Drop Oscillations), and the influence of size and position of compressible volume on Pressure Drop Oscillations.
The influence of surface orientation on the onset of nucleate boiling from microporous surfaces
2018, International Journal of Heat and Fluid Flow
Citation Excerpt :
Such ``stepwise” nucleation hysteresis took place in small steps during incipience boiling. Similar features were observed by Ayub and Bergles (1990) with different enhanced surfaces using the Gewa-T type in R-113. The occurrence of ``stepwise” nucleation hysteresis was caused by the gradual active nucleation sites or nucleate boiling area.
Herein, the effect of surface orientation on the onset of nucleate boiling from microporous coated surfaces was investigated experimentally. Based on different surface orientations—which varied from horizontal facing upwards to horizontal facing downwards—it is proven that the onset of nucleate boiling surface superheat decreased as the orientation angle increased for both microporous surface and plain surface. Additionally, during the incipience boiling period, a temperature overshoot was observed. This largest temperature overshoot was found decreased with increasing orientation angle. The thermal boundary layer and the stirring effect of bubble flow were attributed to these phenomena. It was also found that even at higher wall temperatures, the heat transfer coefficient at the largest temperature overshoot point was still higher than the onset of nucleate boiling point. Increasing orientation angles yielded higher heat transfer coefficients through increased thermal boundary layer temperature and promoted nucleate boiling.
Pool boiling enhancement techniques
2020, SpringerBriefs in Applied Sciences and Technology
Understanding of Interactions for Bubbles Generated at Neighboring Nucleation Sites
2018, Heat Transfer Engineering

View all citing articles on Scopus

View full text

Nucleate pool boiling curve hysteresis for GEWA-T surfaces in saturated R-113

Abstract

Application of Heat Transfer Augmentation

The Use of Heat Exchangers with THERMOEXCEL Tubing in Ocean Thermal Energy Power Plants

ASME Paper No. 78-WA/HT-65

Characteristics of Nucleate Pool Boiling from Porous Metallic Coatings

J. Heat Transfer

Pool Boiling Heat Transfer from Enhanced Surfaces to Dielectric Fluids

J. Heat Transfer