Investigation of subcooled flow boiling and CHF using high-resolution diagnostics

Richenderfer, Andrew Jonathan; Kossolapov, Artyom; Saccone, Giacomo; Demarly, Etienne; Kommajosyula, Ravikishore; Baglietto, Emilio; Buongiorno, Jacopo

doi:10.1016/j.expthermflusci.2018.07.017

Cited by 104 publications

(43 citation statements)

References 31 publications

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“…Details about the postprocessing algorithms can be found in Ref. [2]. A summary of the measured boiling quantities used as inputs in the stochastic model is reported in Sec.…”

Section: Experimental Setups and Diagnosticsmentioning

confidence: 99%

“…Our heaters consist of a 1-mm thick, IR transparent sapphire substrates (20 x 20 mm 2 ), coated with a 0.7 µm thick, IR opaque, electrically-conductive Indium Tin Oxide (ITO) coating (see Figure S1.1). The thermal response of the heater is determined by the sapphire substrate, which has thermal properties (e.g., thermal diffusivity and effusivity) very similar to Stainless Steel, Inconel, or Zircaloy [2]. The ITO coating, in contact with water, is the joule heating element.…”

Section: Infrared Heatermentioning

confidence: 99%

“…Examples of temperature and heat flux distributions obtained by this technique can be found in the videos of Ref. [2].…”

Section: Infrared Heatermentioning

confidence: 99%

“…Experimental investigations have revealed that CHF depends on fluid properties and operating conditions, heater geometry, surface material, orientation, and properties (e.g., roughness, porosity, and intrinsic wettability). Many mechanisms and models have been proposed to capture these effects [2]. However, there is still no agreement within the thermal science community on the actual trigger mechanism for the boiling crisis, let alone a universal model to predict it.…”

mentioning

confidence: 99%

“…These distributions are processed to measure nucleation site density, bubble wait time and growth time and, importantly, the footprint area of each bubble on the boiling surface, using the techniques described in Ref. [17]. The measured bubble footprint area probability density functions (PDFs) for saturated pool boiling and subcooled flow boiling tests run at atmospheric pressure are shown in Fig.…”

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confidence: 99%

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Percolative Scale-Free Behavior in the Boiling Crisis

2019

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We present the first experimental observations of scale-free behavior in the bubble footprint distribution during the boiling crisis of water, in pool and flow boiling conditions. We formulate a continuum percolation model that elucidates how the scale-free behavior emerges from the near-wall stochastic interaction of bubbles and provides a criterion to predict the boiling crisis. It also offers useful insights on how to engineer surfaces that enhance the critical heat flux limit.

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“…Details about the postprocessing algorithms can be found in Ref. [2]. A summary of the measured boiling quantities used as inputs in the stochastic model is reported in Sec.…”

Section: Experimental Setups and Diagnosticsmentioning

confidence: 99%

Section: Infrared Heatermentioning

confidence: 99%

“…Examples of temperature and heat flux distributions obtained by this technique can be found in the videos of Ref. [2].…”

Section: Infrared Heatermentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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Percolative Scale-Free Behavior in the Boiling Crisis

2019

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Laser Surface Engineering for Boiling Heat Transfer Applications

Zupančič

Gregorčič

2021

Materials With Extreme Wetting Properties

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Nucleate boiling is inseparably connected with our everyday life. It is not only utilized in simple tasks like cooking, but it is also important for applications on various scales, ranging from enormous nuclear power plants to miniature microelectronics. This widespread integration is the result of its ability for effective heat transfer at low temperature differences between the heated surface and the surrounding fluid. The surface wettability undoubtedly influences the boiling heat transfer, but the observed behaviour cannot be explained without taking into account the surface topography and chemical modifications due to intense boiling processes. This chapter demonstrates how nucleate boiling enhancement can be achieved on surfaces with various wetting properties and specific micro/nano topographical features, fabricated using a straightforward, robust and scalable laser texturing approach. We discuss the basics of nucleate boiling and how it is affected by surface wettability; provide a fundamental background of laser surface engineering and its ability to achieve extreme wetting properties; and finally demonstrate the applicability of the laser-textured surfaces in enhancing and controlling nucleate pool boiling of different fluids. We show how laser surface engineering decreases the wettability effects on the key boiling parameters andin this wayensures more stable heat transfer performance.

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