Mario R. Mata (Author), Matic Može (Author), Armin Hadžić (Author), Giseop Lee (Author), Blake Naccarato (Author), Isaac Berk (Author), Iztok Golobič (Author), H. Jeremy Cho (Author)

Abstract

Boiling is a prevalent phase-change process that plays a vital role in facilitating efficient heat transfer from a heating surface. While this heat transfer mechanism is generally effective, a rapid increase in surface temperature can lead to hydrodynamic instabilities, resulting in a boiling crisis. Previous studies have shown that surfactants often improve boiling performance and change the boiling crisis behavior. Conventional wisdom in this field attributes that these changes in boiling behavior are tied to the critical micelle concentration (CMC) of the particular surfactant. However, our work reveals that these changes in boiling behavior are independent of the CMC for three nonionic surfactants across a wide range of molar concentrations. In addition, visual snapshots of the bubbling behavior indicate changes in bubble formation, such as bubble size and nucleation site density, influenced by the molar concentration-dependent diffusion timescale of surfactants. Hence, these findings offer compelling evidence that boiling behavior, encompassing both boiling performance and boiling crisis, is governed by the dynamic adsorption of surfactants rather than dictated by the CMC. This becomes evident when quantifying the heat transfer coefficient (HTC) and critical heat flux (CHF) using the logarithm of molar concentration, as predicted by theory. Building upon these findings, we propose insights for controlling when CHF modification occurs in specific scenarios involving any surfactants. These insights hold significant potential for optimizing heat transfer processes and leveraging surfactants in energy-related applications to maximize boiling efficiency.

Keywords

vrenje v bazenu;kritična gostota toplotnega toka;vrelna kriza;surfaktanti;kritična micelarna koncentracija;dinamična adsorpcija;časovna skala difuzije;pool boiling;critical heat flux;boiling crisis;surfactant;critical micelle concentration;dynamic adsorption;diffusion timescale;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FS - Faculty of Mechanical Engineering
UDC: 536
COBISS: 203687171 Link will open in a new window
ISSN: 1879-2189
Views: 25
Downloads: 0
Average score: 0 (0 votes)
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Other data

Secondary language: Slovenian
Secondary keywords: vrenje v bazenu;kritična gostota toplotnega toka;vrelna kriza;surfaktanti;kritična micelarna koncentracija;dinamična adsorpcija;časovna skala difuzije;
Type (COBISS): Article
Pages: str. 1-21
Issue: ǂVol. ǂ233, art. 126008
Chronology: Nov. 2024
DOI: 10.1016/j.ijheatmasstransfer.2024.126008
ID: 24669795
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