Experimental investigation on the Leidenfrost phenomenon of droplet impact on heated silicon carbide surfaces

Wang, Zefeng; Xiong, Juntao; Yao, Weiyi; Qu, Wenhai; Yang, Yanhua

doi:10.1016/j.ijheatmasstransfer.2018.09.091

Cited by 38 publications

(7 citation statements)

References 38 publications

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“…While on the rough surface, as the microgrooves are beneficial for the spreading and escaping of boiling vapor, it needs a higher temperature ( T RDL ) to induce more vapor film to suspend the boiling droplet, so that the Leidenfrost point of cutting fluid increases (Figure d). However, it should be noted that some previous research studies , have suggested that an increase in Sa would lead to a decrease in T DL (Figure S2), which is different with our findings, and previous studies − have suggested that peaks on rough random surfaces puncture the vapor film and that the rupture of the vapor film reduces the pressure below the droplet, lowering the dynamic Leidenfrost point. While in our work the designed microstructure is a highly homogeneous microgroove array (Figure c), when the droplets are in contact with the microgroove arrays, the designed microgrooves provide trapping and escape channels for the vapor, so a higher temperature is needed to generate enough vapor film to achieve droplet suspension.…”

Section: Resultscontrasting

confidence: 99%

“…Hence, abundant topic studies have been conducted on the liquid boiling under various temperatures and working conditions from various perspectives. For example, there are some research studies concentrating on the variation of the Leidenfrost point (both static and dynamic point) and its affecting factors. − It should be noted that the Leidenfrost point ( T L , T DL ), defined by Liang and Mudawar, is the wall temperature at which the droplet is in the critical state of transition boiling and film boiling . When the velocity of the droplet hitting the wall is equal to 0, it is denoted by T L , and when the velocity is greater than 0, it is denoted by T DL .…”

Section: Introductionmentioning

confidence: 99%

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Delayed Leidenfrost Effect of a Cutting Droplet on a Microgrooved Tool Surface

Guo

Liu

et al. 2023

Langmuir

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Regulation over the generation of the Leidenfrost phenomenon in liquids is vitally important in a cutting fluid/tool system, with benefits ranging from optimizing the heat transfer efficiency to improving the machining performance. However, realizing the influence mechanism of liquid boiling at various temperatures still faces enormous challenges. Herein, we report a kind of microgrooved tool surface by laser ablation, which could obviously increase both the static and dynamic Leidenfrost point of cutting fluid by adjusting the surface roughness (Sa). The physical mechanism that delays the Leidenfrost effect is primarily due to the ability of the designed microgroove surface to store and release vapor during droplet boiling so that the heated surface requires higher temperatures to generate sufficient vapor to suspend the droplet. We also find six typical impact regimes of cutting fluid under various contact temperatures; it is worth noting that Sa has a great influence on the transform threshold among six impact regimes, and the likelihood that a droplet will enter the Leidenfrost regime decreases with increasing Sa. In addition, the synergistic effect of Sa and tool temperature on the droplet kinetics of cutting droplets is investigated, and the relationship between the maximum rebound height and the dynamic Leidenfrost point is correlated for the first time. Significantly, cooling experiments on the heated microgrooved surface are performed and demonstrate that it is effective to improve the heat dissipation ability of cutting fluid by delaying the Leidenfrost effect on the microgrooved heated surface.

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Section: Resultscontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Delayed Leidenfrost Effect of a Cutting Droplet on a Microgrooved Tool Surface

Guo

Liu

et al. 2023

Langmuir

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“…When the surface temperature is sufficiently high (generally above T L ), the impact outcome can be categorized as the breakup 13,14 or equivalent to the thermal atomization. 18,19 Here, we identified such an outcome as the Leidenfrost breakup, for example, the droplet impact (U = 3.1 m/s, T W = 500 °C) in Figure 2b.…”

Section: Resultsmentioning

confidence: 99%

“…Ma et al 12 experimentally investigated the effect of surface wettability on the droplet impact and boiling modes in the We−T W regime. Wang et al 13 found that the thermal properties of the solid surfaces can greatly affect T L and critical heat flux temperature of water droplets but hardly influence the critical We of droplet breakup. Jadidbonab et al 14 investigated the influence of ambient pressure on diesel droplets impacting on a heated aluminum substrate and identified six impact regimes in the parametric space of We and T W .…”

Section: Introductionmentioning

confidence: 99%

Subpatterns of Thin-Sheet Splash of a Droplet Impact on a Heated Surface

et al. 2021

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A thin-sheet splash of a droplet impact on a solid surface typically appears as secondary droplets are ejected from a levitated liquid lamella. A recent work (Qin, M.; Tang, C.; Guo, Y.; Zhang, P.; Huang, Z., Langmuir 2020, 36 (18), 4917−4922) identified three subpatterns of a thin-sheet splash on a smooth wall at room temperature (T 0 ). In the present work concerning the high-temperature (T W ) surface, we show that subpatterns of the thin-sheet splash can be unified in the three-dimensional phase diagram of Oh−We−T W , where Oh is the Ohnesorge number and We is the Weber number. As T W is sufficiently high, the Leidenfrost effect becomes so prominent that both deposition and thin-sheet splash make a transition to Leidenfrost breakup. For the transition surface temperature T W,cr from thin-sheet splash to deposition, a scaling correlation of T W,cr/T 0 ∼ We 3/2 is derived based on the analysis of the temperature-dependent destabilizing force on the levitated lamella and agrees well with our experimental data.

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“…They analyzed the minimum film boiling temperature (MFBT), minimum heat flux and the heat transfer coefficient of film boiling. Wang et al [16] investigated the Leidenfrost phenomena of droplet impact on heated SiC-CVD surface. They developed an empirical model for droplet maximum spreading factor.…”

Section: Introductionmentioning

confidence: 99%

Quenching Experiments with CrAl-coated Zircaloy Cladding in Reflooding Water Flows

Lee

2021

Energies

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A quenching experiment is performed to investigate the heat transfer characteristics and cooling performance of CrAl-coated Zircaloy (Zr) cladding in a water flow. The CrAl-coated Zr cladding is one of the accident tolerant fuels for light water reactors. The uncoated Zr cladding is also used in this quenching experiment for comparison. This experiment simulates reflood quenching of fuel rod during loss of coolant accident (LOCA) in nuclear power plant. The test conditions were determined to represent the peak cladding temperature, the coolant subcooling and the reflood velocity in the event of LOCA. The flow visualization showed the film boiling during early stage of reflood quenching and the transition to nucleate boiling. The film layer decreases as the coolant subcooling increases and becomes wavy as the reflood velocity increases. The CrAl-coated Zr cladding showed more wavy and thinner film than the uncoated Zr cladding. The rewetting temperature increases as the initial wall temperature and/or the coolant subcooling increases. The quench front velocity increases significantly as the coolant subcooling increases. The reflood velocity has a negligible effect on rewetting temperature and quench front velocity.

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Experimental investigation on the Leidenfrost phenomenon of droplet impact on heated silicon carbide surfaces

Cited by 38 publications

References 38 publications

Delayed Leidenfrost Effect of a Cutting Droplet on a Microgrooved Tool Surface

Delayed Leidenfrost Effect of a Cutting Droplet on a Microgrooved Tool Surface

Subpatterns of Thin-Sheet Splash of a Droplet Impact on a Heated Surface

Quenching Experiments with CrAl-coated Zircaloy Cladding in Reflooding Water Flows

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