| Issue |
E3S Web Conf.
Volume 578, 2024
XL Siberian Thermophysical Seminar (STS-40)
|
|
|---|---|---|
| Article Number | 01040 | |
| Number of page(s) | 5 | |
| DOI | https://doi.org/10.1051/e3sconf/202457801040 | |
| Published online | 14 October 2024 | |
Features of heat transfer and phase-change on a pinned surface at pulse heat release
1 Novosibirsk State University, 630090, 1 Pirogova St., Novosibirsk, Russia
2 Melentiev Energy Systems Institute SB RAS, 664033, 130 Lermontova St., Irkutsk, Russia
3 ITMO University, 197101, 49 bldg. A Kronverksky Pr., Saint Petersburg, Russia
* Corresponding author: polinakhan@gmail.com
An experimental study was conducted of the boiling characteristics of water subcooled to the saturation temperature during pulsed heating on a smooth surface with a technical roughness of up to 5 μm and on a modified surface with cylindrical pins 200 μm in height and diameter, located at the nodes of a rectangular grid with a step of 400 μm, with an upward flow with a pressure of 0.29 MPa and an average flow velocity of 0.52 m/s. It was found that at an initial water temperature of 110°C for a modified surface, the rate of increase in the heater temperature is lower, and the onset time of nucleation is the same as for a smooth surface. For an initial water temperature of 80°C and an average temperature increase rate of about 5000 K/s, it was experimentally shown that the bubbles on the modified surface are larger, but their number and the share of the area occupied by them are significantly lower than on a smooth surface.
© The Authors, published by EDP Sciences, 2024
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